Low figure on dyno!
01 March 2011, 08:09 AM
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Low figure on dyno!
car is 2006 hawkeye wrx, full decat, sti tmic , uprated fuel pump, green panel filter, tdo5 18g turbo.....with remap
did a rolling road day at weekend and got 311bhp , 326 lbs tourque
on my standard intercooler with tdo4 , i got 278 bhp , 355 lbs tourque
can't understand why the figures are so low , on the road the car performs so well, i know of other cars that got bigger dyno readings than me but on the road m y car pulls away from them so whats going on
i know of a same car as mine with same simalar set up will pull 360/370 on rollers
any ideas
did a rolling road day at weekend and got 311bhp , 326 lbs tourque
on my standard intercooler with tdo4 , i got 278 bhp , 355 lbs tourque
can't understand why the figures are so low , on the road the car performs so well, i know of other cars that got bigger dyno readings than me but on the road m y car pulls away from them so whats going on
i know of a same car as mine with same simalar set up will pull 360/370 on rollers
any ideas
01 March 2011, 09:08 AM
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Yup they can differ alot, but this is a pretty good rolling road and very accurate
Like you said it drives ace on the road and in my opinion that's what counts
but its quite a big loss in torque and power, and you may not feel it as much as you think, but with you on how it feels on the road, may be worth checking with the mapper again Still your car did well on the rollers on saturday
just not the figures you wanted 
so may be worth speaking with said mapper again Tony
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01 March 2011, 10:12 AM
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Yup they can differ alot, but this is a pretty good rolling road and very accurate
This is also true but its quite a big loss in torque and power, and you may not feel it as much as you think, but with you on how it feels on the road, may be worth checking with the mapper again
Still your car did well on the rollers on saturday just not the figures you wanted so may be worth speaking with said mapper again
Tony
This is also true
but its quite a big loss in torque and power, and you may not feel it as much as you think, but with you on how it feels on the road, may be worth checking with the mapper again Still your car did well on the rollers on saturday
just not the figures you wanted so may be worth speaking with said mapper again Tony
01 March 2011, 10:25 AM
#10
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It's probably just a simple case of too little ignition timing. Most common issue with road mapped cars if the mapper has no way to measure performance difference and is trying to play it safe. Seat of the pants dyno is completely inaccurate! We can't desipher the difference between torque and power, well I can't through my ****! lol
If he is an opensource mapper, suggest he gets himself a road dyno device of some sort. I actually use a Gtech Pro when not on a dyno, I only bought it as a pre and post map performance measurement device, but so far it has turned out to be exceptionally accurate.
If he is an opensource mapper, suggest he gets himself a road dyno device of some sort. I actually use a Gtech Pro when not on a dyno, I only bought it as a pre and post map performance measurement device, but so far it has turned out to be exceptionally accurate.
01 March 2011, 12:01 PM
#11
I recently had a low (ish) dyno reason as well. 355 with fueling 20g turbo etc. Duncan came down to finish off the cold start and road side of things an found that BOV was bleeding air. Changed back to standard and sorted.... Felt much better on the road fueling the Duncan expected, so hopefully it will show on the dyno
01 March 2011, 12:11 PM
#12
TMIC and badly located dyno fans or leaving the bonnet open would give a very poor peak output as the car pulls back the ignition timing. Or maybe there is someting wrong with teh car - without looking, who knows! The other things is the correctional vales for the drivetrain losses....what is the BHP at the wheels?
Anyway, performance isn't always about peaks... its about the poweband across the entire rev range: So post up the graph so we can be nosey
If you say the cars is faster than others which have higher peak BHP, this suggests that you have a much wider powerband...On the road wide powerbands with a lower BHP will win over higher peak BHP with a narrow powerband as its alot more flexible to varying real world driving situations.
Anyway, performance isn't always about peaks... its about the poweband across the entire rev range: So post up the graph so we can be nosey
If you say the cars is faster than others which have higher peak BHP, this suggests that you have a much wider powerband...On the road wide powerbands with a lower BHP will win over higher peak BHP with a narrow powerband as its alot more flexible to varying real world driving situations.
01 March 2011, 07:19 PM
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It's probably just a simple case of too little ignition timing. Most common issue with road mapped cars if the mapper has no way to measure performance difference and is trying to play it safe. Seat of the pants dyno is completely inaccurate! We can't desipher the difference between torque and power, well I can't through my ****! lol
If he is an opensource mapper, suggest he gets himself a road dyno device of some sort. I actually use a Gtech Pro when not on a dyno, I only bought it as a pre and post map performance measurement device, but so far it has turned out to be exceptionally accurate.
If he is an opensource mapper, suggest he gets himself a road dyno device of some sort. I actually use a Gtech Pro when not on a dyno, I only bought it as a pre and post map performance measurement device, but so far it has turned out to be exceptionally accurate.
Simon
01 March 2011, 11:08 PM
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01 March 2011, 11:32 PM
#17
or quality of fuel
Either way it looks like it is taking timing out of the map at the 5500rpm mark and that is killing the power curve (hopefully not killing the engine too)
Torque wise .. depends on what boost and what timing is running at that rev range. But you would need to ask your mapper to look at the graphs and comment.
01 March 2011, 11:42 PM
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or poor cooling fans
or quality of fuel
Either way it looks like it is taking timing out of the map at the 5500rpm mark and that is killing the power curve (hopefully not killing the engine too)
Torque wise .. depends on what boost and what timing is running at that rev range. But you would need to ask your mapper to look at the graphs and comment.
or quality of fuel
Either way it looks like it is taking timing out of the map at the 5500rpm mark and that is killing the power curve (hopefully not killing the engine too)
Torque wise .. depends on what boost and what timing is running at that rev range. But you would need to ask your mapper to look at the graphs and comment.
Simon
02 March 2011, 07:56 AM
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Cooling fans are definately not poor on that rolling road
Just an example how good it is, ive not seen my old Spec C for over 4 years, she use to run between 312 and 316bhp on that rolling road, she ran 314, not bad for a standard car (though the backbox had changed)
Tony
Just an example how good it is, ive not seen my old Spec C for over 4 years, she use to run between 312 and 316bhp on that rolling road, she ran 314, not bad for a standard car
(though the backbox had changed)Tony
03 March 2011, 07:59 PM
#29
I was there Saturday and there was a few disappointed faces, but I believe there was a few surpising results too. ie
The Black Blobeye STI (sorry forgot who it was) that was standard, he was selling it and was hoping for a dyno print with over 300, his previously runs was in the 290's. However he ran a 320+..... (back box removed
)Liz did you run what you was expecting too? You got a 353 if memory serves me correctly?
Lee (My 06) ran a lot less than expected, 290 / 330. His previous run 2 years ago was 325 / 375 i think?!?
The standard Bug WRX with the Whoosh graphics ran 216ish which sounds about right.
So where do you draw the line with the results. Its suspected that Lee's was down to old plugs (40+k)..... who knows.
Rob
03 March 2011, 08:49 PM
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I was hoping for more then last year Rob as I had put headers on and I got more so I was pleased
Rage with the black sti ran 290 at scooby clinic in Oct last year
But everyones figures were down by about 20 bhp on their rollers
Rage with the black sti ran 290 at scooby clinic in Oct last year
But everyones figures were down by about 20 bhp on their rollers