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Discussion Starter · #1 ·
Dyno results seemed low today. 2001 Z06 with Donaldson
filter and mag airbridge running 100 octane gas. Water and
oil temps both around 160 degrees. The dyno operator ran the
car up to rev limiter in third gear. After three runs best results
were max power=325 max torque=324. The correction factor
was 1.03, not sure what that means. This car runs very strong
just surprised at such low numbers. Any ideas as to why?
 

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Those numbers are somewhat low. Did you get an a/f ratio readout with the dyno graph? That may explain some.
 

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Discussion Starter · #3 ·
No I don't believe so. Just outside temp at 49.3 degrees, 28.28-0.44 in.Hg. 0 ft. CF=1.03 rpm/mph=65 Thats the only info
on the printout.
 

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GEORGE P

GO BACK, AND HAVE THEM DO IT CORRECTLY.........it should have been done in 4th gear...........
Then the ratio would be around .9 to 1...............
This was a waste of you're time and $$$$$........
Never heard of a Dyno on a Z06 in 3rd gear......
For AUTOMATICS yes.......not M6's, or M12's........which is what you have.:-?

PS: you're car should have also been run at higher temps in the oil area, and H2o.................
 

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Geo

Well, I hope you can find someone who KNOWS how to do it......
Also, they shouldn't run it up to the limiter(if indeed they bumped it off)...........-? :eek:
 

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Discussion Starter · #7 ·
He ran the engine very hard against the limiter then just let off
the pedal. Did not sound very good at all.
 

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George

I would not go back to this place of business, cause it sounds like they don't have a clue......at least from what i have seen and experienced in Dyno's on the Z's.........
 

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Hey George,

I think I am going to let them keep my 75.00 rather than go back, I will find us another Dyno next time :)
 

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Discussion Starter · #10 ·
Yes I think your right. Again thanks so much for the info, I was
feeling like I have the slowest Z known to General Motors.:lol:
 

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Discussion Starter · #11 ·
I'll call SilverState Motorsports on monday and ask some more
questions regarding experience. Also going on a saturday would
be a plus.
 

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Awesome, I am looking forward to having them done right. :eek:
 

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I was thinking the same thing. You won't see the true peak value unless you are in 4th gear. Those guys don't seem to have a clue!!!
 

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GeorgeP said:
Just outside temp at 49.3 degrees, 28.28-0.44 in.Hg. 0 ft. CF=1.03 rpm/mph=65 ..........
My thoughts.
It's not possible to have .44 In Hg of water vapor pressure at 49 F (100% RH would be .349 In Hg). I don't think the CF is right.

Was the 325 HP at 6500 rpm? The max should have been around 6000 rpm.

Was the 325 HP with or without the CF value?

Was the hood open for the pull? If the under hood temp was greater than the dyno weather sensors the CF will be wrong.

Although 4th gear pulls are more normal, a 3rd gear pull should be OK because the dyno is using engine rpm from an inductive plug wire pickup. The drive train loss may be a little higher in 3rd
(14% vs 12%).

The water and the oil temps were too low. I have seen big motors loose 50 HP with cold oil.

This is another case for having your own weather instruments to use at the dyno and at the track.

 
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