20valver
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Registered: 14th Sep 08
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lambretta races a Ferrari
http://uk.youtube.com/watch?v=dQZZHKMJ9RQ
rd 500 v4 2 stroke 150/160 mph on the road and on the track 200/ 210 mph
http://uk.youtube.com/watch?v=_Bh7B1Xv0AM
rg 500
http://uk.youtube.com/watch?v=SARVvPck5tA&feature=related
burt Munro and his indian
http://uk.youtube.com/watch?v=SARVvPck5tA&feature=related
[Edited on 19-09-2008 by 20valver]
[Edited on 19-09-2008 by 20valver]
[Edited on 19-09-2008 by 20valver]
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andyc1234
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Location: Lancashire
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quote:
Originally posted by 20valver
quote:
Originally posted by andyc1234
quote:
Originally posted by 20valver
when the air feed is behind the front grill if you put the feed tube right on to the front of the air box inlet this gives maximum pressure and has you move the feed tube further away from the air box inlet this reduces the pressure,
on my set found out the end of the feed tube need to be 13mm away from the airbox inlet
[Edited on 18-09-2008 by 20valver]
you really crack me up man. you will realise one day when you move onto bigger and better engines that what you try and do is completely pointless.
how is tuning my 1.4 pointless
to see me on the road against my lc you need 350 to 400 bhp from a standing start that that might not be enough
been in a couple of 500 bhp cars cosworth cruising at 155 mph at 3,500 rpm
and a big powered Toyota m r 2
question how do you taper port a throttle body
question how do you line up the taper ported throttle body to standard inlet manifold
question how do you make the tps deliver more fuel
question what exhaust inside diameter do you need on a 1.4/1.6 engine
question how do you get more fuel pressure
question where on the car has the most air pressure for the air box
question what is the best coolant temperature for optimum performance
question which is best cone filter or a enclosed induction
question where are the restrictions on a spi this applies to the corsa as well
question what finish do you need on the inlet side of the engine to aid swirl
and tumble so you do not get wet fall out
question what finish do you need on piston crowns and combustion chambers
[Edited on 19-09-2008 by 20valver]
[Edited on 19-09-2008 by 20valver]
you really are a strange chap. wtf is filling your airbox with filler going to do really. and learn to jack your car up properly as well.
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andyc1234
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Location: Lancashire
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answer those questions yourself as well and see how wrong you are.
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Gareth F
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Registered: 16th Jan 08
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*watches tumble weed roll past* Silence is golden
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20valver
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Registered: 14th Sep 08
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the restrictions on the 1.4 spi are
airbox
the rubber induction tube from the back of the airbox to the spi plenum
the spi plenum its self
the top of the throttle body
the 35 mm inside diameter throttle body and yup this is used on the 1200cc corsa
under neath the throttle valve on the spi throttle body
the inlet manifold
the inlet ports on the cylinder head
the exhaust ports on cylinder head
the swirl chamber above the inlet valve head
but not the square inlet port its self
the tps sensor
throttle body valve under lifts by 2 to 3 mm
the 4 to 1 exhaust manifold and single down pipe
the centre silencer
back box
inside diameter of the exhaust pipe
the fuel pressure regulator
the airbox entrance is to small and the heat exchanger is in there
as well even when you remove the hole assembly the air inlet
hole at the front of the airbox is to small still,
so this needs making bigger and while making the air inlet hole
at the front of the airbox bigger the tunnel inside needs making
bigger as well and while making this tunnel bigger to the left hand
side of the airbox there is about 20mm of airbox in the way so this
needs removing with a soldering iron to melt the plastic when this
has been removed then you melt the plastic tunnel that is inside
the airbox with the soldering iron
once one side of the tunnel is free from the airbox then you
get the soldering iron to warm up the tunnel on the curve and
as you do this the other side of the tunnel can be lifted up like
you see in the photo,
once the tunnel is in this position you can re weld it with the
soldering iron in the same way as you do gas welding with the bottles,
then the duct that feeds the resonator chamber needs plastic
welding as well then once this is done then the next part is to
do the left hand side of the airbox were there was 20mm of
airbox was in the way you need fibre glass resign and u pol c car
body filler and remember to key the plastic with 40 grit production
paper first,
you get some cardboard and make a template then you get 3 m
2 inch masking tape and put the cardboard template in place then
from the inside of the airbox you stick it in place with the 2 inch
masking tape, then you mix up your fibre glass resign with the
hardner then apply the fibre glass resign over the template, once
the fibre glass has gone off then it needs rubbing down with 40 grit production paper then it needs filling with u pol c filler you mix up
the u pol c filler with the hardner then apply it over the fibre glass
resign and let it harden
when the u pol c filler has gone off then you take off the 2 inch
masking tape and the cardboard template that was inside ,
rub down the fibre glass resign with 40 grit production paper and
mix up some more u pol c filler and apply it where the cardboard
template was and use your finger to shape the inside of the airbox,
then you can start rubbing down the out side of the airbox with
40 grit production paper then i needed to put another skim of
filler in to strengthen up the fibre glass resign let the filler go off
then rubbed down the filler with 40 grit production paper to a
smoothish surface then guide coated the filler and then rubbed
down the filler with 80 grit production paper and shaped it to the
out side profile of the airbox and finished in 240 grit paper ready
for primer
then you shape the inlet hole by hand with 40 grit paper first
the 80 grit paper next and while shaping with 80 grit paper the
inlet hole needs measuring at the same time
when the air inlet hole measures 64mm side to side
and 76 mm top to bottom then stop and finish it with
400 grit paper ready for primer
i put 4 to 6 coats of primer on then let the primer dry off
completely then guide coated the primer and wet flatted the
primer with 600 grit wet and dry paper and then sprayed it blue
once the colour was dry then wet flatted the colour
with 1200 grit wet and dry paper then polished it up
[Edited on 20-09-2008 by 20valver]
[Edited on 20-09-2008 by 20valver]
[Edited on 20-09-2008 by 20valver]
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20valver
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Registered: 14th Sep 08
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the standard size throttle body on the 1.4 spi is 35mm inside
diameter but the 1.2 spi corsa uses this size throttle body as well
so got a 44mm inside diameter cav 1.8 spi throttle body,
the stud placement on the 1.4 inlet manifold is in the same place as
the 1200cc/1400cc/1600cc/1800cc and this throttle body fits straight
on to the standard 1.4 inlet manifold
then got a file to file down the ally throttle body where the
throttle valve spindle stop is because when at full opening it
under lifts by 2mm to 3mm then when that was done time to
take out the throttle valve and throttle valve spindle on the
cav 1.8 spi throttle body,then on the under side of the throttle
valve just below where the throttle valve normally closes against
needs masking up with masking tape then taper port it to 49mm
at a 45 degree angle,
then you need to use 40 grit paper to get rid of the file marks and
when the file marks are gone then you need to 80 grit paper it to get
rid of the 40 grit paper marks and when that is done give the taper
a slight hone and this aids swirl and tumble into the inlet manifold
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andyc1234
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Location: Lancashire
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and how much bhp is this monster going to have when its done then
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20valver
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still got to put the rest of the information up yet, my astra speedo gave a reading of 128 mph in 4th gear,
when tuning think outside the box,
Evaluate
one set of conditions. Make only one change, test the result and compare it to the first set of conditions.
this is the same when tuning any car
[Edited on 20-09-2008 by 20valver]
[Edited on 20-09-2008 by 20valver]
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alan-g-w
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Registered: 9th Nov 07
Location: Glasgow
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I'll have whatever you're smoking mate
EDIT: in fact, no, I don't do crack
[Edited on 20-09-2008 by alan-g-w]
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20valver
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quote:
Originally posted by alan-g-w
I'll have whatever you're smoking mate
EDIT: in fact, no, I don't do crack
[Edited on 20-09-2008 by alan-g-w]
I don't do crack nor do i
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alan-g-w
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Location: Glasgow
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class.
So what's the future plans for the brief? port + polish the bodywork so it's as aerodynamic as possible?
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Limecat
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quote:
Originally posted by 20valver
still got to put the rest of the information up yet, my astra speedo gave a reading of 128 mph in 4th gear,
when tuning think outside the box,
Evaluate
one set of conditions. Make only one change, test the result and compare it to the first set of conditions.
this is the same when tuning any car
[Edited on 20-09-2008 by 20valver]
[Edited on 20-09-2008 by 20valver]
Fuck me, you have too much time on your hands. Can't you do something more constructive like throw one out over a page 3 bird or something?
Have I seen you on MIGWeb? I recall someone on there keep saying 'test it and re-evaluate' but in reality half of what you are saying is bollocks as changes wouldn't be consistent, they would vary depending on revs.
Why the hell is your username 20valver if you piss about with a shonky old 1.4 8v? 
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sand-eel
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Location: carluke/braidwood--IRNBRULAND
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what is the airbox mod actually for? If you want less restriction get rid of it entirely.
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20valver
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quote:
Originally posted by sand-eel
what is the airbox mod actually for? If you want less restriction get rid of it entirely.
have tried a cone filter got rid of resonator load of crap lost power used too much fuel and even when heat sheilded have you every looked at a standard spi airbox and see how tiny the inlet hole is = crap
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Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
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quote:
Originally posted by 20valver
question how do you make the tps deliver more fuel
question what is the best coolant temperature for optimum performance
question where are the restrictions on a spi this applies to the corsa as well
Those three questions are stupid.
The TPS will not deliver more fuel. You could adjust the TPS to give more fuel earlier on, but there would be very little point, it would cause the car to overfuel low down and think the engine was at WOT when it was at 80%, or whatever you'd ended up inadvertantly setting it at.
Coolant temperature for optimum performance depends on the engine, and would be a range, not a specific number of degrees, oil temperature is more important anyway.
The restrictions on the SPI engines are the 3 missing injectors.
[Edited on 21-09-2008 by Robin]
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Robin
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Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
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quote:
Originally posted by 20valver
also you can adjust the length of the feed pipe so it can work better at lower speeds or higher speeds, the closer the feed tube to the airbox for lower speeds and further away for higher speeds this also helps when you run lager throttle bodys ie cav 1.8 spi throttle body and helps get round the square inlet port on the c 1.4/1.6/1.8 nz cylinder head
Adjusting the inlet feed pipe length to the airbox will do sweet FA. You're talking about inlet pulse resonance. At the airbox, that far away from the inlet manifold itself, it will do absolutely nothing.
If you had equal length inlet runners (which you don't, unless you've made a new inlet manifold) then changing the length of the inlet tract on each port would make a difference to power or torque, or even completely ruin the power curve and make it look like the alps.
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20valver
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the rubber induction tube from the back of the airbox to the top
of the spi plenum is no good to many ribbs and there is a big step
just before the spi plenum, so replaced it with a plastic tube with
a inside diameter of 70mm and a out side diameter of 75mm,
then next is the spi plenum took all the insides out and used
a soldering iron to do this by melting the plastic parts that
were in the way
then next was the tps sensor what this does is as you open up
the throttle this tell the ecu to deliver more fuel to the engine and
how much the throttle valve is opening , but when the throttle is
fully open there is still 6mm of lift left in the tps sensor so this would
mean you do not get full throttle, so i made a adjustable tps sensor by making slotted adjustment hole with the soldering iron
when the slotted adjustment hole was right i used the soldering
iron to weld it in place now can use it in full adjustment or minus
adjustment when you advance the tps sensor this tell the ecu to
deliver more fuel to the engine and when you retard the tps sensor
this tell the ecu to deliver less fuel to the engine
when you advance the tps sensor this is the same as lifting the
needle up on a carburettor and when you retard the tps sensor
this is the same as dropping the needle on a carb = fine adjustment
[Edited on 21-09-2008 by 20valver]
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20valver
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because the cav 1.8 spi throttle has a inside diameter of 44mm
but because it has been taper ported to 49mm the standard
spi 1.4 inlet manifold that the throttle body bolts onto is to small
at 35mm inside diameter
so the next step was to bore out the inlet hole on the
standard 1.4 spi inlet manifold that the throttle body bolts to,
to a size of 49mm inside diameter
then the next step was to port the intake runners to the
inside diameter of the inlet manifold gasket, i bolted the inlet
manifold gasket to the intake runners and started to port them
with a file, then with 40 grit production paper to get rid of the file
marks when the file marks were gone then sanded them with
80 grit production paper untill the 40 grit production paper marks
were gone and at the same time gave them a hone type finish
to aid swirl and tumble into the inlet port
this is still the same inlet manifold as above
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20valver
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quote:
Originally posted by Robin
quote:
Originally posted by 20valver
also you can adjust the length of the feed pipe so it can work better at lower speeds or higher speeds, the closer the feed tube to the airbox for lower speeds and further away for higher speeds this also helps when you run lager throttle bodys ie cav 1.8 spi throttle body and helps get round the square inlet port on the c 1.4/1.6/1.8 nz cylinder head
Adjusting the inlet feed pipe length to the airbox will do sweet FA. You're talking about inlet pulse resonance. At the airbox, that far away from the inlet manifold itself, it will do absolutely nothing.
If you had equal length inlet runners (which you don't, unless you've made a new inlet manifold) then changing the length of the inlet tract on each port would make a difference to power or torque, or even completely ruin the power curve and make it look like the alps.
You're talking about inlet pulse resonance = inlet pulse resonance tuning
you need a long inlet manifold for low rpm upto 6,000 rpm
then you need a short inlet manifold for high rpm upto 10,000 rpm
and above and this is the same for 2 stroke engine's , and if
the inside diameter of the intake runners is to big then you loose
pressure and velocity into the inlet port
[Edited on 21-09-2008 by 20valver]
[Edited on 21-09-2008 by 20valver]
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Robin
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Location: Northants Drives: Clio 182 Cup
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Regardless, you need equal inlet lengths on each cylinder for it to make any difference. You don't have that, so changing the length of the pipe between the outside world and the airbox really is acheiving nothing at all.
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20valver
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does your location mean jam sport at northampton if so i did not phoned up jamied
who is a member on the migweb when he was at work like he said on the migweb forum
[Edited on 21-09-2008 by 20valver]
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Robin
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Location: Northants Drives: Clio 182 Cup
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Your last point about the internal diameter of the inlet runners is true to a point, yes, if they're massive and it's a small engine, it's going to be detrimental to the output of the engine.
However, that depends on the engine. The (2 litre) Ford Duratec will make 300bhp with either 52mm inlet runners or 54mm, it makes it at less rpm with the larger ones though.
This is irrelevant to your engine though as you're using an awful inlet manifold which is never going to perform properly, regardless of the position of the inlet to the airbox.
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Robin
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It does. I have no idea who jamied is though, Northampton is quite a big place.
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20valver
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then the next step was to get rid of the 4 to 1 exhaust manifold because a 4 to 1 exhaust manifold is for high rpm = 6,500 rpm above and a bit of mid range
and a 4 to 2 to1 exhaust manifold is for low rpm upto 6,000 rpm and spread the power over a wider rev range upto 6,000 rpm,
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20valver
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quote:
Originally posted by Robin
It does. I have no idea who jamied is though, Northampton is quite a big place.
do you work at jam sport tuning weedon way northants
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