I had my Evoms GT700 GT2 on a dyno last Friday. I live outside of Denver and this facility is at about 6000' above sea level. The GT2 made 630 whp, torque was about the same. However, the 1.25 correction factor used is for NA cars. Uncorrected the car made about 505 whp. The dyno is a Dynojet.

The car runs strong but these numbers are lower than I expected. I realize that altitude has an impact but I thought it was minimal on turbo charged cars. I've asked Evoms for their dyno sheets done in Arizona before the car shipped but have not recieved one yet.

I'm taking the GT2 to the track on Wedenesday. There's a chance of rain so it may not work out.

I also have a GT700 Cayenne that I brought to the track about a month ago. My times were dissapointing with a best trap speed of only 105 mph. The truck runs well but will not launch. I tried everything including turning the PSM off and brake torquing. It will not hold more than 2,000 rpms off of the line and bogs horribly on launch. It's quick at highway speeds but I'm not impressed with it's 1/4 mile times.

700 HP seems opptimistic on both vehicles. Again, does altitude really hurt turbo charged vehicles this much? Thanks.

 

altitutude hurts, even turbo cars.

i ran my car at 6300 DA and best trap speed was 117. i should be around 125 at sea level.

the same day a stock 996 tt was traping 105!

 

back in college I had a civic for my freshman year, drove it back from NY to Cali. Drove through Denver on my way up was going 100 on the way, and when I was closer to the top, I couldnt get over 45 and I never let off the throttle

 

I was making mad HP on my S4 and it is hard as hell to get solid times up at Bandimere...so altitude definitely affects them pretty heavily.
Are you Adam's buddy? that just had the Evo kit put on up at autosport werks? if so we should hook up...are you going to Bandi on Wed for test and tune? I was thinking about going up as well.

 

Yes, unfortunately even thought turbos were first created for contering altitude effect (use in airplanes), we still get hit. I posted my runs a year ago and got slammed for using a correction factor. So I just settle for the uncorrected value (mine was 390 before all of my mods were completed). You also can't compare different dynos...even the same make..

 

I had my upgrade installed by Evoms in Phoenix.

If the weather holds I'm heading to Bandimere tomorrow. If you see a midnight blue GT2 stop by and say hi.

I've had very little seat time in this car so I'm not expecing much. Tomorrow's goal is to figure out how to launch this thing without fishtailing all over the place. I had a few runs in it 3 weeks ago and couldn't hook up. It was running in the high 12's at 125-127 mph! My best 60' time was a 2.6. The car was all over the place in 1st and 2nd gears. I mounted some drag radials for tomorrow so hopefully I'll get some decent traction.

You're right about Bandimere. It's a great track but the altitude can be depressing. As an example, I've yet to see a stock C6 Corvette break out of the 14's. I had a modified '03 Evo 8 that I used to own run an 11.4 @ 124 mph. I believe that it's still the fastest Evo8 1/4 mile time at Bandimere and it was done 3 years ago.

 

For sure - us up here in the mountains just get to compare with each other and let the guys down at sea level post the big #s and fast times :-)

We should all get together and roll up to Bandimere in force one of these Wed evenings here very soon. Not sure if the thread starter is who i think he is, but if he came and you Bill, and if we could get Dave to finish Claus' GT2 build then we could roll up as a crowd of blown P cars.

 

What's a realistic correction factor on a 996TT in your opinion? Thanks.

 

That would be FUN!!!!

 

Good question I think it is less than SAE suggests, but more than nothing

 

That sounds like a great plan! I'll bring the GT700 GT2 and GT700 Cayenne.

I may run this Saturday in the Tuner Mayhem event. It's for imports and sport compacts only.

 

Sounds like the answer I used to give in my college math courses.

 

Yeah and I'm a statistician...I really think the only way would be for several cars to get tested at sea level and then the same several at altitude...then I could figure a correction...but who is going to do this? I say we just vote on one we like... I do have a P-box...maybe we could figure something out.

 

Aww dood. you guys are getting me stoked on going up there...my UMW software will be going in tomorrow, so i'm definitely hankerin for some runs just to see how it does compared to the last time i ran my S4 - which the best time was a 13 flat with a 1.8 60'...if i can launch this thing i should be able to best that without issue i think.

my email is villain@peakpeak.com, hit me up if and whenever you are going up, i may not be able to make it tomorrow, but almost definitely next Wed.
whats the story on the Tuner Mayhem? i have never run an actual event up there, just the T&T nights.

...that means there is another TT around with a 700kit in it, cause ASW up in Broomfield just rolled one out.
We should see if Adam will come out in his widebody S4 avant too...that thing should run pretty hard these days.

 

Different dyno's also make this difficult. EVOMS dyno'd this car in Phoenix and they're going to e-mail it to me so I can compare it to my dyno up here. It won't mean much since they're different dynos (Mustang vs. Dynojet) in different environments.

A 1.16 correction factor has a nice ring to it! Let's take a vote and make it official!