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Old 06-28-2008, 11:13 PM
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Disappointed with dyno numbers

I went to the dyno the other day and I am really disappointed. You be the judge.

Here is my setup

Std bore 350
Rpm Air Gap
Holley 670 street avenger
Vortec Cylinder heads minor work with 1.6 rr
comp cams 282hr 230/236 110 LSA
9.6 comp ratio

700r4with a TCI street fighter torque converter
Ford 9" w/ 3.50 gears

Power results were
283rwhp
292 ftlbs torque
A/f was between 13-14.

When I was talking with comp cams I was shooting for 400hp at the crank.
They told me this would get it close they calculated 396hp and 424 tq. Am I over reacting or is this about right?

Last edited by lowrides10; 06-28-2008 at 11:19 PM.
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Old 06-29-2008, 12:03 AM
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ehhh.....thats not a bad set of numbers but with that CR of 9.6 you arn't gonna be getting your 400 at the crank.

I would say that the weak points in the build up are the CR and the cam.....that thing is kinda small.

IMHO you have 300 at the flywheel and of course you lose some thru the tranny, especially if its an auto
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Old 06-29-2008, 12:15 AM
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are you sure thats the right compression.. alot of people get the 4 valve relief flat-tops and alot of them are 9.3:1
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Old 06-29-2008, 01:01 AM
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What they told you should be close.

Your problem is most likely in the stock transmission, or the kick-down/detent cable adjustment. The dyno shop should have checked the adjustment though. Just because you install a TCI torque converter does'nt mean your transmission is "up to snuff".
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Old 06-29-2008, 01:50 AM
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Whats the exhaust setup?

Do you have the ignition curve dialed in yet?

Usually you need at least a 290HP/R cam to get near 400 HP in my experience, from the looks of it your getting near 325-340Hp at the crank if you consider loss through the trans. The torque seems a little low though thats why I mention the ignition curve.
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Old 06-29-2008, 11:11 AM
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The exhaust is hedman shorty headers. Through H pipe 2.5" with borla mufflers then dumps. As far as the timing they took all advance out vacuum and mechanical it is locked at 36*.
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Old 06-30-2008, 09:07 PM
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It'sa 700 R4

283 hp divided by 77% = 367 hp.
I think this is about right for what you have.

Locked distributor is a bad idea, IMO.
Good tuning might sneak a few more.

Remember every dyno is different. Numbers are only valid on one dyno for tuning purposes from run to run improvements.
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Old 07-03-2008, 09:12 AM
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A final thought

Seemingly identical engines can easily vary 40 hp due to ring type and wear, valve job, valve type, push rod deflection, spring harmonics, carb tuning, and numerous other often overlooked factors.
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Old 07-03-2008, 12:31 PM
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A/F is awful lean if it is between 13-14 at WOT. Should be between 12.3-12.8 at full throttle. This alone will chop off 30+ HP
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