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In the video I posted above IAT starts in the 90's. Climbs to about 145 by the end of the run.
Sure, meth would help with the "more speed" part (Sam and I talked about that). We'll get there. I would love to see this car in the 10's eventually (7/16/2016 - well, that was easy). But first I want to make sure we're par for the course.
I picked up a VBOX Sport from Sam. Very cool device. No issue with setup or usability- works like a charm. No hesitation recommending this product.
The acceleration data from the Cobb AP and the VBOX are very comparable. But here is my current VBOX data (I did two runs and they were nearly identical):
This is with a custom Cobb tune, Fabspeed exhaust & headers, HJS 200-cell cats, IPD y-pipe & plenum, By Design Intercoolers and a BMC air filter. I also spiked the fuel this time around so it's probably closer to 93 octane (as opposed to Utah's typical 91). So there ya go! If you're in Utah and you do all that you can almost run the advertised stock times.
I will need to clear this tank out and retest it w/ the 91 octane. This actually seems to be the biggest limiting factor. I'm guessing some methanol is in my future.
Still soliciting stock times for higher elevations. I'm pretty sure I've found a local guy with a stock Turbo S and I'm planning on drafting him into Utah quarter mile elevation testing.
More to come. I hope you sea level people appreciate what you've got and how much easier it is to get it.
Well, my custom Cobb stage 3 tune (version 4) ended up giving me a VBOX best of 10.88 @ 126 mph on straight-from-the-pump 91 octane (thanks Sam & Mitch!).
I'm not a tuner but I'd guess this car is pretty tapped out up here on the current setup. As always if anyone with stock or similar setups has some times at higher elevation please post them for posterity. If you're close by hit me up- I'll come to you. This is for science.
I just ordered a 2017 TT from Strong; it should arrive in late December to get snowed on. Go Christmas! So after break in ends and the roads are good again I should be able to give you a stock comparison. No later than early 2017.
I've actually started to wonder about the density altitude compensation design limits with the 991 TT/S platform... It's possible the stock turbos are just running out of breath due to our thin air here. I'm hoping it's not that bad as I was hoping to have the option of flashing the ECU to free up a bit of power once the warranty is up!
I think we typically have 7000 ft density altitude throughout the summer days here despite only being at 4400 feet.
As a quick and dirty reference, the NHRA has an altitude correction factor for Super Stock for SLC. I think that's NA engines and 4400' not 7000' - but I didn't look very hard. Anyway it's far from exact but might give you an idea. They say for to multiply your ET by 0.9566 and multiply your MPH by 1.0412 to get an equivalent-to-sea-level result. That makes your 10.88@126.1 into a 10.4@131.3. Source: http://www.nhra.com/competition/altitude.aspx
On the upside, Utah Motorsports Campus is a great track and is really close, and canyon roads are common. At least we have something going for us here.
Sweet! That's going to be be awesome- would love to check it out sometime.
Won't be totally apples to apples (since my car is a 991.1) but I think knowing what the 991.2 will do here in Utah would still be great info.
I have my boost turned up 2 psi over stock and that's about the limit. Turbos are fine at lower RPMs but looking at logs you can see them loose steam right before shift points. I could be misinterpreting data, but the car's top end just isn't where I think it should be.
NHRA correction factors are usually halved for turbo cars. In my experience we seem to lose a lot more than that though. Maybe it's that 7000 DA you mentioned.
UMC is very cool- used to go there all the time when it was Miller. Haven't been there since the changeover though. I had an accident in the Alpine Loop so I don't do a lot of canyon driving these days.
But yeah, Utah has some stuff going for it.
Cam
Originally Posted by _ace_
I just ordered a 2017 TT from Strong; it should arrive in late December to get snowed on. Go Christmas! So after break in ends and the roads are good again I should be able to give you a stock comparison. No later than early 2017.
I've actually started to wonder about the density altitude compensation design limits with the 991 TT/S platform... It's possible the stock turbos are just running out of breath due to our thin air here. I'm hoping it's not that bad as I was hoping to have the option of flashing the ECU to free up a bit of power once the warranty is up!
I think we typically have 7000 ft density altitude throughout the summer days here despite only being at 4400 feet.
As a quick and dirty reference, the NHRA has an altitude correction factor for Super Stock for SLC. I think that's NA engines and 4400' not 7000' - but I didn't look very hard. Anyway it's far from exact but might give you an idea. They say for to multiply your ET by 0.9566 and multiply your MPH by 1.0412 to get an equivalent-to-sea-level result. That makes your 10.88@126.1 into a 10.4@131.3. Source: http://www.nhra.com/competition/altitude.aspx
On the upside, Utah Motorsports Campus is a great track and is really close, and canyon roads are common. At least we have something going for us here.
07-12-2016 | 09:45 PM
