fallwood

Just thought I'd post my latest power run graph to get opinions on torque curve/power delivery etc. Bhp is at the flywheel and torque is measured at the wheels, is torque usually measured at the wheels as I know bhp is quoted at both wheels and flywheel. Apparently there is a blip at about 4500 rpm where the greddy boost controller takes over. I use 2 different garages for power runs and both give results within a couple of bhp of each other so I know the rollers are correctly calibrated.

"http://i19.photobucket.com/albums/b1...wood/graph.jpg"

Mitchy260

Well lane have quite a bad rep and lots of people here will not use them. They use a prehistoric dyno that just give out flywheel figures! What use is that?

He bumps the TX loss up to give a ''good'' flywheel figure in order to keep the customer satisfied. If the rollers recorded @ wheels measurements then he would not be able to do so!

Avoid well lane like the plauge! Cars are renound for producing ''optimistic'' figures.

Oh and your torque will be measured at fly

What car do you have and what mods? I bet your at wheels figures are in the region of 200bhp. This is the measurement you want to know as the flywheel figure is irrelevant!

fallwood

Ah yes back in the days of blown up escort turbos etc, Well lane used to have a bad rep because of some of the staff that used to work there, Its a new bunch now and I find them to be excellent (apart from one problem when I bought my last car, salesman is no longer working there). A lot of the staff run scoobys themselves so have more than a passing interest in tuning them. The torque figures are definately at the wheels because the guy doing the run said that u cant really find out how much is lost through transmission like u can with the bhp figures (dip clutch apparently and dyno calculates loss through transmission), as torque is a measurement of acceleration you cant use the same system to calculate the transmission losses whilst measuring the torque, therefore our system quotes torque at the wheels. Car is an 01 wrx with full decat (inc uppipe), k&n panel, runing at 19psi. Just out of interest what do people think 302bhp is at the wheels, I already know the answer just want to know how much people generaly think is lost through tranmission.

Mitchy260

About 200-215bhp

A 30% loss on a 300hp flywheel car will be 210 @ wheels.

According to all these scoobies then yes 200-215bhp.

http://dyno.scoobynet.co.uk/PEindex/jap.htm

So you have a 01plate bugeye 220bhp WRX? You've fitted an exhaust system, filter and upped the boost and now you have 300hp+?

Does every other dyno in uk record torque at wheels then?

fallwood

Yup, I have no idea if anything was done internally to the car before I bought it but its definately not had anything done to it whilst ive had it, just the full decat uppipe,downpipe,center section and backbox, filter and 19psi of boost, when I bought the car I was aware that it had previously had a full decat/filter etc but had been returned to standard for resale, bhp was shown at 218bhp on the same rollers. Just quoting what Ive been told as Im not really in the know as to the technical details of how a dyno works. Is this a unusual figure.

Mitchy260

I think for the mods you have mentioned then 300+ does seem high for a 220bhp WRX. There must be a few sneaky mods!

Im sure someone will correct me if im wrong but is the standard turbo upto that kind of power

fallwood

Also had a run done at kersaws near york and the results were within a couple of bhp, whats the highest boost a standard turbo will acheive, mine accidentaly boosted to 23psi when I was setting my boost controller and seemed to be holding steady untill i rapidly took my foot off the pedal. The car seems to have a bit of mystery about it as there are a few things that dont seem right for a standard car, the fueling for example stays within normal parameters right up to 20psi, thats assuming that the numbers i was told (8.5 -8.7) are within safe limits. Do you suspect that the turbo may be upgraded, how can I tell just by looking.

fallwood

Has anyone had runs done at well lane/kershaws and then had one done elsewhere that gave drasticaly different results ?.

wisecobandit

Surely the fuel cut would have cut in by then unless its been rechipped or the fuel cut disengaged somehow?

fallwood

Yes its been superchipped, just assumed that would be obvious as its running 19psi, will be more thorough with my info in future.

PAUL CRAFTS

Yes took my car to well-lane did 239 bhp . Then took it to sc 286.

wrc350bhp

took mine to sc 337 then went to wrc and 350 they were very surprised when told them sc were lower as usually they(wrc) are lower

fallwood

So your figure was lower at well lane, thats strange as people seem to think that their figures are optimistic , dont know what people are basing that assumption on as ive always had reliable figures quoted by them.

GrollySTI

I don't know either way, but how do you know they were reliable? are you comparing their results with other results?

Mitchy260

I wouldn't say well lane results were reliable! I just think the guy had a very poor run? An inexperienced operator?bad conditions? poor car?

Its a rolling road lottery!

However 300+ from a WRX with a superchip/decat and panel filter seems optimistic don't you think?

fallwood

Yes I am , I have tried just about every dyno in the west yorkshire area , I eventually narrowed it down to 2 which I use regularly and both give results wiithin a couple of bhp of each other , I really dont see how anyone can comment on the reliablility of the figures ive been quoted unless they have compared well lanes dyno to others themselves.

fallwood

I know dynos can be inconsistent with results, optimistic maybe but not impossible, many years ago I had a mildly modded fiat chinquecento sporting (oh the shame) that pushed 110 bhp, according to everyone on the fiat forum it was impossible with the mods I had done , eventually I went along to one of the group dyno runs to get a so called more accurate figure, car produced 107bhp on the day and left most of the members picking their jaws of the floor. Its not unheard of to get the odd car that seems to give more power than others , maybe ive just got a good un. Can anyone recommend a dyno in the yorkshire area that is known to be accurate, I will happily get a run done elsewhere just to satisfy my own curiosity, dont want to travel too far though ,up to 70 miles from leeds would be about the max I would want to do.

Mitchy260

TBH mate flywheel figures are all pub talk! Its like the 0-60 talk between the max power brigade!

Its what you have at the wheels that count and because well lane dont do wheels figures many people will avoid them.

You can have 210bhp@ wheels and flywheel reading of 305bhp
Joe bloggs can have 210 @ wheels and flywheel reading of 280bhp!

Both cars are as powerful as each other and both will perform exactly the same! Just 1 owner thinks the 300+bhp car must be quicker as the flywheel figure tells him so!

fallwood

Thats why I use 2 different dynos for comparison, kershaws dyno measures at the wheels (212bhp) then the computer does its bit and gives u the flyweel bhp which is practicaly the same as the 303 figure (301 actually), I know dyno readings are purely for bragging rights and its the quarter mile times that gives the best indication of how quick ur car is in a straight line. Its all just a bit of fun but still nice when u get a good reading.