My horsepower saga
11-18-2007, 06:59 PM
#22
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Originally Posted by booger
Do you think it could be the Utec ?
Unless it's datalogging is WAY off no. My timing and fuel are perfect. I thought about that for a bit, but everything works correctly and the car has a very smooth powerband.
11-18-2007, 07:15 PM
#23
Originally Posted by BriGuyMax
Unless it's datalogging is WAY off no. My timing and fuel are perfect. I thought about that for a bit, but everything works correctly and the car has a very smooth powerband.
11-19-2007, 05:25 AM
#25
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(any more boost makes more torque but the power falls off WORSE about 5500rpm)
(no pun)and as BRiM said...def not the turbo kit or the exhuast....and not the EMS probably either... and even with stock heads and the stock plenum...still should be able to pull way more than 500.... engine ->
hope you sort things out!
Last edited by IIQuickSilverII; 11-19-2007 at 06:30 AM.
11-19-2007, 06:29 AM
#27
Originally Posted by MRC Motorsports
Im gonna vote for poor compression,valve float,or improperly timed motor...
The stock top end should flow plenty enough for your goals.
I hope you get this sorted out... good luck
11-19-2007, 07:10 AM
#28
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Originally Posted by MRC Motorsports
Im gonna vote for poor compression,valve float,or improperly timed motor...
As stated in my first post...compression is perfect. And with the 10psi tune on my unichip the car pulled just as hard up top as it did with the stock motor.
Originally Posted by Zivman
I hate to say it brian, but I also think the motor is the issue. Cams, plenum and what-not will help up top, but don't think it will completely correct the problem you are having. Did you do a leakdown on the motor along with the compression test?
The stock top end should flow plenty enough for your goals.
I hope you get this sorted out... good luck
The stock top end should flow plenty enough for your goals.
I hope you get this sorted out... good luck
I don't want you guys to turn this thread into a BZM bashing thread...the motor is FINE. The car made basically the same power with the built motor on 10psi that it made on my stock motor on 10psi.
11-19-2007, 07:14 AM
#29
11-19-2007, 07:16 AM
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I'm surprised no one has mentioned that your AFR graph shows almost flat 10's on the top end.
edit - nm I just noticed it at the bottom of the post. Is there any reason for running so rich?
edit - nm I just noticed it at the bottom of the post. Is there any reason for running so rich?
Last edited by taurran; 11-19-2007 at 07:18 AM.
11-19-2007, 07:19 AM
#31
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Originally Posted by BriGuyMax
480rwhp on the dynapak at GRD
Can you say where you had the dynojet dyno/tuning done?If you didn't see it on my earlier thread, here's my dyno @ 14psi at GRD.
11-19-2007, 07:26 AM
#32
Originally Posted by BriGuyMax
Can anyone show me a dyno of a setup like mine with STOCK cams and STOCK upper and lower plenum @ 14+ pounds of boost? I can't find any setup like that.
That said, I think leakdown is more telling than a compression check. Tells you more about the condition of the cylinders and rings and the heads and valves. I think now days, a compression check alone doesn't mean all that much
I have my chart from my tune at 14 psi peak tapering to 11 psi at redline on my previous motor (8.8:1 compression, APS 2.5" downpipes and exhaust, stock heads and cams, but a crawford plenum)
Actually, I found this chart... I think it is mine from last yr based on the dates. this would be comparable to what you would be looking at for power. This is labeled 14 psi -
11-19-2007, 07:32 AM
#33
Originally Posted by BrianLG35C
Hmm, the only difference is I do have the APS plenum, but that shouldn't be near the 30whp difference between you and me. Can you say where you had the dynojet dyno/tuning done?
If you didn't see it on my earlier thread, here's my dyno @ 14psi at GRD.
Can you say where you had the dynojet dyno/tuning done?If you didn't see it on my earlier thread, here's my dyno @ 14psi at GRD.
11-19-2007, 07:55 AM
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Originally Posted by taurran
I'm surprised no one has mentioned that your AFR graph shows almost flat 10's on the top end.
edit - nm I just noticed it at the bottom of the post. Is there any reason for running so rich?
edit - nm I just noticed it at the bottom of the post. Is there any reason for running so rich?
11-19-2007, 07:57 AM
#37
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Originally Posted by BrianLG35C
Hmm, the only difference is I do have the APS plenum, but that shouldn't be near the 30whp difference between you and me. Can you say where you had the dynojet dyno/tuning done?
If you didn't see it on my earlier thread, here's my dyno @ 14psi at GRD.
Can you say where you had the dynojet dyno/tuning done?If you didn't see it on my earlier thread, here's my dyno @ 14psi at GRD.
Actually our power curves look very similar until 5500rpm which supports my theory that the plenum really would help with the stock cams.
11-19-2007, 08:01 AM
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Originally Posted by Zivman
I am not bashing on anyone, just that I have read about something similar to this before... it just sounds all too much the same.
That said, I think leakdown is more telling than a compression check. Tells you more about the condition of the cylinders and rings and the heads and valves. I think now days, a compression check alone doesn't mean all that much
That said, I think leakdown is more telling than a compression check. Tells you more about the condition of the cylinders and rings and the heads and valves. I think now days, a compression check alone doesn't mean all that much
I just did a little reading on compression vs. leakdown and the only thing a leakdown test tells you is compression over time. The higher the rpm the less leakdown numbers matter. For example a car with bad leakdown but good compression would have a bad idle and low rpm response, but high rpms would be fine.
I've ruled out the motor as the issue. It it was making very poor power all the way through the powerband then I would buy the motor being bad theory, but the fact is it make good low end and midrange power.
11-19-2007, 08:02 AM
#39
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Originally Posted by max2000jp
Brian, this might be a stupid question, but are you sure your vvt is working properly?