Rileysport
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Registered: 18th Jun 04
Location: West Yorkshire
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quote:
Originally posted by Edd
you are all talking shite all cop cars are fitted with resistors off of e-bay which gives them 50bhp gains at least
Thats 50bhp and 67000 lbft of torque edd 
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micra_pete
Premium Member
Registered: 23rd Apr 03
Location: West Yorkshire
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bought from this man
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Steve
Premium Member
Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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quote:
Originally posted by micra_pete
quote:
Originally posted by Corsa_Sam
lol this makes me laugh!! why would you chip a car with no other engine changes, do you know what chipping/mapping does.
altering the map on a standard car will make a difference, there are improvements to be made on any map depending on the customers / owners need, when a manufacturer writes a map they have many things to consider, economy, emissions regs, and power, however all three can rarely be combined so compromises are made, timing is always weak, fuelling is always on the timid side, and it should be on most peoples car,
on some standard maps for example you'll find the fuelling is pulled back hugely in measured areas for mpg and emissions for example, and this is at various gear / rpm / speed points.
some of these things matter little to engine tuners, improvements to throttle / engine response can be quiet dramatic when a map is made for a specific need, in our case (normally) power, even on a standard car.
there is a lot of bull spoken about engine mapping, on the internet.
may i ask what you think chipping / mapping does?
[Edited on 06-12-2005 by micra_pete]
Having personally had several cars remapped with piggy back unichips, they simply alter the fueling/ignition timing and can tweak several sensors such as lambda etc usually only beneficial on engines that have been modified, ie you cant just up the fueling on standard injectors and inlet manifolds and cams etc
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Edd
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Registered: 8th Nov 04
Location: Glasgow
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quote:
Originally posted by SRi-Co
quote:
Originally posted by Edd
you are all talking shite all cop cars are fitted with resistors off of e-bay which gives them 50bhp gains at least
Thats 50bhp and 67000 lbft of torque edd
word
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micra_pete
Premium Member
Registered: 23rd Apr 03
Location: West Yorkshire
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just for your info i tune ecu's, actually i re-map standard nissan ecu's, and alter the code directly.
i also have experience with various piggy-back units.
they tweek the lambda sensor? why would you do that? and yes you can up the fuelling on standard injectors, what has the manifold and cam got to do with it?
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Steve
Premium Member
Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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inlet manifold, lambda sensor needs changing on some vehicles that have decats.
I was suggesting inelt manifold and cams, as you would need a higher duration cam to take advantage of the extra fuel being injected in, whats the point in upping the fuel if the valves arent open long enough to allow the extra fuel
I would not fancy upping the fueling on standard injectors and injection timing, i bet half the cars you supposedly tune overfuel like hell!
[Edited on 06-12-2005 by Corsa_Sam]
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Rileysport
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Registered: 18th Jun 04
Location: West Yorkshire
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quote:
Originally posted by Corsa_Sam
inlet manifold, lambda sensor needs changing on some vehicles that have decats.
I was suggesting inelt manifold and cams, as you would need a higher duration cam to take advantage of the extra fuel being injected in, whats the point in upping the fuel if the valves arent open long enough to allow the extra fuel
I would not fancy upping the fueling on standard injectors and injection timing, i bet half the cars you supposedly tune overfuel like hell!
[Edited on 06-12-2005 by Corsa_Sam]
Point being that you can change the map more toward power and sacrifice how environmentally friendly it is... its bloody fine adjustment tweeking the map won't necessarily make it overfuel
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Steve
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Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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you'd be suprised at how close to 100% efficient the standard maps are.
You cant normally change the standard map and get much gain, if anything out of it at all, of course it depends on the car and the manufacturer, but generally, in my experiences changing the standard maps on n/a cars does very little on std engines
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micra_pete
Premium Member
Registered: 23rd Apr 03
Location: West Yorkshire
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seriously mate, im stopping now, and there is no point explaining things to people like you, its not all about upping fuel, you need to go away and read up on how cars works as what your saying is absolute nonsense.
changing lambda sensors? to what? injection timing? what duty do you think standard injectors run at? 100%?
[Edited on 06-12-2005 by micra_pete]
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micra_pete
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Registered: 23rd Apr 03
Location: West Yorkshire
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quote:
Originally posted by Corsa_Sam
you'd be suprised at how close to 100% efficient the standard maps are.
You cant normally change the standard map and get much gain, if anything out of it at all, of course it depends on the car and the manufacturer, but generally, in my experiences changing the standard maps on n/a cars does very little on std engines
seriously your talking rubbish
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Steve
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Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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why are you getting caught up on lambda sensors, that was just an example of one sensor that you can change, but changing the lambda sensor readings can make a car that fails to idle properly due to a decat, idle correctly
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Steve
Premium Member
Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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just quickly found this
http://www.keveney.com/otto.html
explains perfectly how valves opening to let fuel/air in works lol, i dont know how you think the fuel air mix is let into the chamber?
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Steve
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Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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also id like to see where you learnt to manually alter a cars ecu, the only way is through an odb2 cable and unless you have the maps already then creating your own is pretty much impossible, trying to alter an ecu is as difficult as trying to write a computer program in hex or binary.
You can buy software that does it, but again you seriously have to know what your doing as its so easy to fuck up an ecu, where did you learn?
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boyracer2002
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Registered: 10th Aug 02
Location: West Yorkshire
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the astra cops cars are slooooooooooow as fek, i found this out and beat them they were nowhere to be seen 
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Rileysport
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Registered: 18th Jun 04
Location: West Yorkshire
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quote:
Originally posted by boyracer2002
the astra cops cars are slooooooooooow as fek, i found this out and beat them they were nowhere to be seen
naturally i was unaware of this until you posted
[Edited on 06-12-2005 by SRi-Co]
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boyracer2002
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Registered: 10th Aug 02
Location: West Yorkshire
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 its when i had my astra this time last year somethign standard lookign which i could blend in with other cars 
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Tom
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Registered: 3rd Apr 02
Location: Wirral, Merseyside
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What a gay thread.
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micra_pete
Premium Member
Registered: 23rd Apr 03
Location: West Yorkshire
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I have no software, you cannot alter Nissan 16bit ecu's through a cable, only through an additional board (pic below) im not going into massive details but I will give you a brief run down, I pull the standard rom code from the ecu using consult (Nissans diagnostic port) by issuing certain commands the ecu streams the code, in hex format, I have a friend in Japan who makes an expansion board for Nissan ecu's who made a one for the cg13de ecu, which uses 2 x 8bit eproms to replace the 16 bit on board unit, as my car is my "test bed", and no information is available on my ecu, I have to work through it myself, there is no-where on the internet you can find information on the cg ecu, however the methodology is the same for most Nissan ecu's, so the basics can be learnt, however the location / methods behind different ecu's in the range are different so I was on my own, nor is there any software for it, I then worked through the code / rom, and found the main maps, fuel / ignition, start up maps, coolant based maps - idle etc, I then worked through the rest of the code to find the constants - rev limits, multipliers, etc, and any conversion rates they may use.
it has taken me several years to get to this stage
there are still maps on the ecu that I don't know what they do, but they are not massively important maps
the only software I use is a program that converts the maps from hex to decimal as its easier to read, and displays the values in a grid.
I then use a eprom emulator for live mapping , although at the minute I cannot as I need a new one, and then write the eproms and attach them to the board.
I am currently working through the programme on the ecu to make changes to how it works to add expansion maps.
I hope that explains my background a little
image
[Edited on 06-12-2005 by micra_pete]
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Steve
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Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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what do u use to test out the maps on as its too easy to fuck up an ecu by writing an incorrect value
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Meat-Pie-SRI
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Registered: 10th Apr 02
Location: Berkhamsted, Drives Mk4 R32
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micra_pete
Premium Member
Registered: 23rd Apr 03
Location: West Yorkshire
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when changing values your are changing the data the ecu references, not the code itself, so no you can't mess the ecu up, i do testing on my own car, as micra engines are cheap, but when mapping, i have no problems.
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Martyn
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Registered: 17th Oct 03
Location: Luton
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quote:
Originally posted by Meat-Pie-SRI
I feel my moped could outrun this 
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danny-corsa
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Registered: 15th Mar 05
Location: Warwickshire Drives: Astra GSi 16v
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quote:
Originally posted by Corsa_Sam
what do u use to test out the maps on as its too easy to fuck up an ecu by writing an incorrect value
its easy to fuck em up if you don't know what your doing, micra pete sounds like he does and it also sounds like hes pissed on your fire.
as for LSD's they are not just used for launching off standing starts and rallying, they also help cornering due to the fact they limit the slip on the diff thus meaning when you power on you dont get one wheel gripping and one wheel spinning, you get both gripping.
and WTF do you mean when you say "you need a longer duration cam if your adding more fuel"? changing the fueling alters the mixture to make the car run more efficiently, if you want more fuel and air then you change the duration of the cam or find a way of getting more air in eg turbo.
[Edited on 06-12-2005 by danny-corsa]
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–DAN–
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Registered: 14th Nov 05
Location: West Yorkshire
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Its probably more fown to the way they are driven. Remember these guys are trained to drive safely at high speeds - most people with modded cars don't have a clue how to drive anyway so most cop cars will appear faster - and I aint talking about in a straight line either - anyopne car thrash the arse outta their motor in a straight line.
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3CorsaMeal
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Registered: 11th Apr 02
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quote:
Originally posted by danny-corsa
quote:
Originally posted by Corsa_Sam
what do u use to test out the maps on as its too easy to fuck up an ecu by writing an incorrect value
as for LSD's they are not just used for launching off standing starts and rallying, they also help cornering due to the fact they limit the slip on the diff thus meaning when you power on you dont get one wheel gripping and one wheel spinning, you get both spinning.
what type of LSD does that?
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