See what people might think about this comparison. All are on "stock" Comptech setup with aftercooler. I would assume Comptech attempts to be consistent in they dyno runs (i.e., the input/calibration data into the dyno). However, there are many factors that can affect dyno results. Use this for informational purposes only and interpret the results as you wish.

Before I present the cars, I thought this particular fact is very interesting. Comptech only dynos in 3rd gear. This is because they don't want too much wheel speed on the dyno. The dynos for all the cars you see on their website are all 3rd gear pulls. This is per Comptech. (I did ask if they could do a 4th gear pull...they said NO. But, that's ok...free dyno! )

I had my car dynoed yesterday after the install of my replacement SC. They monitor much more than other dyno facilities. First, to get the tach/ignition, they actually attach the sensor directly to the ingition/rpm switch(?) located near the fpr. I was told this is a cleaner signal than off the coils. Next, they attach a boost sensor, as well as run dignostics on a lap top while you car is on the dyno. Lastly, the a/f is of course measure.

In comparison, other dynos I've done (Dynojets @ ModaCar 2x and NextGen 1x, and a Mustang, @ Gruppe-S) basically put your car on the dyno, and attach the ignition one of the coil pack. That's it!

Comptech's dyno is a Dyno Dynamics, which is a load bearing dyno similar to a Mustang dyno. Some people confuse this type of dyno with a Dynapack - that's the one you attach to the hub. DD dyno numbers normally fall in line with Mustang results (but factors like operator data input, correction factor, etc. all come into play).

The cars:

1) Mine, 2005: stock boost SC w/ AC, test pipe, modified y-merger, Magnaflows, Krankvents, AFE filter (replaced foam), Toda flywheel, ACT PP, Exedy performance disk

2) 2005: stock boost SC w/ AC, ACT PP and disk (Comptech gave me a copy of the data file for this dyno).

3) *2004: stock boost SC w/ AC

4) *2003: stock boost SC w/ AC

*Numbers taken from Comptech's 2004 - 2003 Dyno comparison, which is available on their website.

Here are the four cars hp and tq. Notice that the other 05 and the 04 almost have identical dyno results! The 05 does pull harder up top.

Something Comptech told me was that the aftermarket pp made a huge difference on the 05. Before this final run, the car was utilizing a stock pp, and measured 20-25 whp less. After the replacement, the car consitently pulled similar numbers, with this posted one as the greatest. Apparently, the clutch was slipping quite a bit! They're thinking of possibly "packaging" >04 S2K with new PPs.



I separated the hp and tq for more clarity:


Appears the 05 has better tq up top, and wonder if the PP may be the contributing factor.


I only had the a/f data for the other 05. It's running WAAAYYYY richer than I am!! I think if it were to lean out, it would definitely make more power. I included the tq curve in relation to the a/f.


I wonder if Comptech purposefully richens the car more than other tuners? Hmmm...

I'm pretty happy with my car. It seems quite a bit stronger with this new sc, vs. my old one. My max 3rd gear pull was 298.7 whp, and 195 wtq. I think if they did 4th gear pulls, numbers would increase. I will dyno on a Dynojet later, 4th gear pulls, so I can have a better comparison with my previous dyno results. Since it's on the Dynojet is an inertial dyno, I believe the lighter flywheel effects will present itself as higher dyno numbers (compared to my pre-flywheel, clutch install).

 

Do you mean aftermarket compared to stock AP2 flyweel?

The AP2's have (IIRC) 4lbs. heavier of an OEM flywheel than the OEM AP1 flywheel, so the aftermarket one makes more of a tangible difference.

 

The other 05 was still using a stock flywheel. Ryan and Billy noted that they "gained" the lost 20-25 whp after the installation of a better PP.

Could be the power difference btwn mine and the other AP2's can be attributed to the lighter flywheel and test pipe. However, would you see flywheel weight differences on a load dyno? I would think hp and tq won't be impact, whereas on an interial dyno, the fw will help accelerate the car more quickly. Hence, more registered wheel hp.

btw, didn't know that the AP2 fw was much heavier than the AP1. Do you have your sc working now?

 

Yes and no

Runs, needs tuning.

Then we can debate F22 vs F20

 

Well, at least it's half yes! If you need any help with anything, let me know.

Definitely! I'm going to add a few more things over the next couple of weeks - header for sure, and thinking about a larger tb...possibly an AEM too.

This summer, I'm going high boost - whatever the max is for Comptech.

 

I would have hoped for a lot better for the '03 with the SC and AC. Maybe I should look into a turbo instead.

 

feeling the same way....

Erick