If you’re looking for the difference between the SCC and the others, I think the drag testing is inferior to Shiv's dyno work. Because the SCC car had more power all along its rev range. That difference will be hard to spot at the strip. Although the peak hp variation should show up in the trap speeds.

 

I got to thinking about having a ringer press car. If it is true, then great! It only means that it will probably be a piece of cake and very cheap to upgrade the normal cars to that level of power. In fact, I think that AMS has already shown this to be true.

 

No doubt they will be easy to upgrade. The only trouble is for the SCCA stock class racing it may help in misclassifying the car. There was one Evo 8 at last weeks SCCA national event in San Diego. It was heavily protested already in DSP. So a set of unrealistic performance tests in some national magazines by a ringer will only help the protesters.

If it is true that the SCCA wants the Evo and the upcoming STi in the same class. If the STi puts out 300 hp, the Evo may have a tough time.

Many people want to keep there warrantees also.

erik

 

I agree. It's not like they stuck a different engine in it. They ECU is probably telling the engine to run a little leaner or something. We could easily do that too. I'm grateful for Shiv's detective work with this because not only does it mean we find the discrepancy, it also means that he's going to figure out how to make our evos do that same.

 

Is it possible to run the SCC car and a store bought Evo through a CA emissions test? Surely, if the SCC Evo had different engine tuning, it's emissions numbers would reflect this.

Am I not correct in this assumtiion?

SC~

 

Agreed. Unless you drag like a complete idiot, you only spend time (even during launch in an AWD car) in the upper RPM range around the peak power. We want to see the entire power band compared to the SCC car.

To Shiv:

WE WANT GRAPHS! WE WANT GRAPHS!!
(preferably superimpose the ringer and the dealer car, same octane )

heff

 

I haven’t read all the posts, there are a lot of them, but for everyone with a dyno's defense, and so everyone else will understand.
Dynos are different, ALL OF THEM!
The #s you get are close approximations of what the car makes at the wheels.
If I had a dyno that told me my EVO only made 100 hp, I would be bummed. But, if I tweaked the car and it now made 125hp, then I would be happy. As I just made 25 more hp with tuning.
It doesn’t matter how much power my dyno says my car makes, vs. my car on your dyno. If they both show an increase of 25 hp, with the mods that were just done, then I gained 25hp.
The only reason for this argument, is for bench racing.
So get your cars on the track and see what they do!!!!

Mike C
Diamond Star Specialties
www.fastevo.com (for the evo guys)
www.diamondstarspecialties.com

 

Here's the graph of the SCC press Evo vs. a standard production Evo:

SCC Press Evo vs. Production Evo - 91 octane


Mark

 

There is no multiple dyno issue here. Just one rather accurate if possibly conservative dyno. One that was very repeatable. With the largest sample of cars yet tested. This is a good application of a good tool.

Erik

 

Thx for the post KK (and Shiv)-- very informative. All I can say is damn, something is definitely not right. Looking at the difference from ~4000 up, the SCC car will definitely pull away from the dealer car. Given that boost is the same in the two cars and that the power difference is maintained so consistently from boost RPM up, I'd venture a guess that we are looking at some not-quite-to-spec cams/and or exhaust differences. Any other theories?

 

Pruven Performance just posted their dyno graphs here:
http://www.pruvenperformance.com/pruvenlancer.htm

223hp and 238lb-ft of torque on an AWD DynoJet.

With mods so far, they have bumped it up to 273hp and 273lb-ft.



Note that the power of Pruven's stock Evo keeps on going up past 5000RPMs, with a peak at 6500RPMs. This is unlike the stock dyno that Shiv has posted that pretty much stops going up at 5000RPMs. Maybe Pruven also got a press car?



Note that the torque of Pruven's stock Evo doesn't trail off nearly as much as Shiv's after 5500RPMs. Between 5500 and 6500, Pruven's Evo drops off by about 15 lb-ft. Shiv's stock Evo drops off by around 30lb-ft.

That just doesn't seem right to me. Why is Shiv's stock Evo so weak above 5500RPMs?

 

Regarding the scc's evo....

Strange . Different Cam or perhaps running more boost or less restrictive exhaust? Hopefully we get to the bottom of this so we can do the same thing.

 

Look at the 5100-5200 on the SCC EVO, nice rapid increase then it hits a brick wall and flat lines. No smooth arch there. Maybe the ECU decided to start retarding the timing early for the less than perfect fuel. Any thoughts?

 

In CA, we run on 91 octane methanol mix. As stated several times before in more than one thread, this lower octane fuel tends to cripple performance above ~5500rpm.

Shiv

 

Aah, sorry. I should have realized it was dynoed on 91 octane. I thought that this was one of the 93 octane dynos.

The difference in peak power numbers between the two cars seems to be about 15hp. That isn't all that much.