Dyno day numbers

3137 Views 5 Replies 4 Participants Last post by Tomasz, May 8, 2010

saabin

Discussion Starter · Mar 14, 2010 (Edited)

The local PCA had a dyno day at a nearby shop. All runs were done on the same day within a few hours of each other, same operator. The dyno was almost new (shop has only been open a year) Mustang Dyno. Obviously all numbers were measured at the wheels. After skimming thru other dyno threads I'd have to say that the numbers today are consistently lower than those others posted here. Unfortunately we didn't get a graph with results, just a printout with max HP and torque.

Anyway, FWIW:

08 Cayman S - SRP, Milltek catback exhaust, desnork - 276hp
06 Cayman S - full B&B exhaust/headers, EVO flash - 265hp
07 Cayman - stock - 218hp
07 Cayman - SRP, Maxspeed catback exhaust - 210hp @6.6K, 174 lb/ft
03 Boxter, -stock I believe - 203hp
?? 993 Turbo w/ various mods (don't recall all of them) - 346hp
04 GT3 - stock 330hp
79 911SC - stock 145hp

Now, I know comparing dynos is not exactly valid, but I must say something must be amiss as my car with the mods recorded lower than the stock one. Maybe I should check w/ Scott to make sure he sent me a tuned flash?

I did the SRP install myself and have checked everything and it all looks OK...

One thing of note on at least 2 of the Caymans the Check Engine light did come on after the runs requiring a reset. The fault code was "Bad Wheel speed sensor" or something like that..

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Blitzkrieg

· #2 · Mar 14, 2010

saabin said:
One thing of note on at least 2 of the Caymans the Check Engine light did come on after the runs requiring a reset. The fault code was "Bad Wheel speed sensor" or something like that..

Interesting results, and yeah something is amiss, a stock cayman can't put down the same number as one with SRP+exhaust.

That fault code is normal due to the front wheels remaining stationary. It usually clears itself within a few miles of driving if you don't have a laptop with a durametric cable handy.

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Dunebasher

· #3 · Mar 14, 2010

Did you get a chance to run on the road against the standard CS just to check?

I'm guessing when you did your flash and exhaust that you noticed some power gains?

It could be a MAF that's faulty and causing lower performance than normal or something else. I'd check real world performance to make sure it wasn't something up with your specific dyno run and then probably get a shop or the dealer to run a diagnostic on it and see if something can be seen.

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Tomasz

· #4 · May 8, 2010

Wheels. What wheels were on the base Cayman that dynoed 218 HP? I see that you have 18s. If the other car had the stock 17s, that could account for the difference.

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saabin

Discussion Starter · #5 · May 8, 2010

Tomasz said:
Wheels. What wheels were on the base Cayman that dynoed 218 HP? I see that you have 18s. If the other car had the stock 17s, that could account for the difference.

I was wondering that myself.. The other car did have 17s. I also found out the other car did have an underdrive pulley as well.

But could those two things alone count for the difference? I wouldn't think that the diff between 17 & 18 wheels would be that much.

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Tomasz

· #6 · May 8, 2010

Yes, wheels make a huge difference on dynos and in 0-60 acceleration times. See here:

Effects of Upsized Wheels and Tires Tested - Tech Dept. - Auto Reviews - Car and Driver

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