Simon L
Member
Registered: 24th Mar 02
Location: Glasgow
User status: Offline
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quote:
Originally posted by big eck
Is it true that the rollers cant measure the fly hp??? I'm in the middle of a discussion on another board and the lad says that all it is is a guess 
He's kinda right, its not a guess, more of an educated guess.
The drag is measured on coast down, and this along with the power at wheels is used to calculate power at fly.
My drag was 37bhp on these rollers, and 45bhp on stars. Both are around 20-25%.
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Simon L
Member
Registered: 24th Mar 02
Location: Glasgow
User status: Offline
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quote:
Originally posted by big eck
I think the drop in a FWD through the gearbox is 20% correct me if i'm wrong, fuk knows how to work it out though lol
No set figure. Varies from car to car.
Can vary due to a number of things, some of which include gear box oil temp, tyre temp, tyre pressure, etc...
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Chump
Member
Registered: 1st Feb 04
Location: Sharnbrook
User status: Offline
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quote:
Originally posted by big eck
Is it true that the rollers cant measure the fly hp??? I'm in the middle of a discussion on another board and the lad says that all it is is a guess
AFAIK you can only get a true flywheel figure by putting the engine on a dyno....rolling road simply calculates it based on a number of different figures.....
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Simon L
Member
Registered: 24th Mar 02
Location: Glasgow
User status: Offline
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I checked 5 cars that went on yesterday and the transmisson loss varied from 19% to 25%
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ed
Member
Registered: 10th Sep 03
User status: Offline
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quote:
Originally posted by REDSPORT
straight through exhaust
ind kit
power cap
ecotek valve
these mods should have it pushing min 160bhp imo.....
Using your Max Power guide to engine mods........
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James_DT
Member
Registered: 9th Apr 04
Location: Cambridgeshire
User status: Offline
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quote:
Originally posted by mav
Corsa XE at falkland = 152 at fly and 117.9 at wheels = 35 drop
Vectra V6 at dastek = 178 at fly and 126 at wheels = 52 drop
Corsa 1.6 at star = 118 at fly and 89 at wheels = 29 drop
Corsa XE at falkland = ~23% transmission loss
Vectra V6 at dastek = ~29% transmission loss
Corsa 1.6 at star = ~25% transmission loss
The XE has the lowest transmission loss, but obviously it differs from car to car. If there was something up with the 'box it'd be more than that, surely?
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Cybermonkey
Member
Registered: 22nd Sep 02
Location: Sydney, Australia
User status: Offline
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I agree, transmission loss looks fine to me. as said by james, arouns 23% which is average. You can expect to see as much as 40% for a 4WD and somewhere between that for RWD.
i Would seriously consider remving the ecocrap valve and seeing what that does to fuelling.
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AK
Member
Registered: 5th Jul 00
Location: Aberdeen City
User status: Offline
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i had 165.5bhp estimated fly, and 130 at the wheels
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Tim
Site Administrator
Registered: 21st Apr 00
User status: Offline
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Mine only ran 152bhp, but with 207Nm... but was advised it was overfuelling top-end. Still need to get it done now it's been rebuilt etc...
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Skinz
Member
Registered: 15th May 03
User status: Offline
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fooking hell tim thats been ages
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vibrio
Banned
Registered: 28th Feb 01
Location: POAH
User status: Offline
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quote:
Originally posted by corsa120
yeh u seeem to be losing slight excess power through transmission, its normally about 10-15% loss through transmission
152bhp is standard power so u should be happy, powercap is crap, filter helps and zorst may gain 1-2bhp so all in all thats not bad
obviosly some healthier/stronger engine might pull that 8bhp ur after mav, dont just take that figure as ur power tho, u have to consider ambient temperature and everything, this vary throughout the day ........ u get me
there is no set amount for transmission loss.
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vibrio
Banned
Registered: 28th Feb 01
Location: POAH
User status: Offline
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quote:
Originally posted by StuartA3Turbo
thats a fair drop in power to the wheels, think thats not quite right tbh. Mav, id remove the ecotek valve, give it a full service and as said above get it set up on the rollers properly. Im pretty sure our audi only loses about 25bhp from fly to wheel power.
again depends on car and the rollers
I've had the same fly result on 2 rollers but the power at wheels where different
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mav
Member
Registered: 19th Jun 01
Location: Scotland
User status: Offline
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cheers for the comments guys..
just going to get it serviced etc...car is running sweet so............
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James_DT
Member
Registered: 9th Apr 04
Location: Cambridgeshire
User status: Offline
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If it isn't broken, don't fix it.
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