dk996tt

Just got a phone call from Tym a few minutes ago. He is finalizing the race gas tune (R850) on my 997 GT2. I wanted to optimize my car for regular pump gas (93 octane) since i will be running it on pump gas most of the time. However, i also wanted the option of running race gas for those few occassions where the extra ponies were needed. Since the P800 (P = pump) has been installed, i have logged over 3000 miles on the car. So far, the car has performed flawlessly. On the P800 tune, the car makes 703 rwhp on a dyno jet. Tym has just finished the race gas tune and has let me know the car made 783 rwhp on C16 race gas at 26 psi of boost. With a conservative drivetrain loss of 10%, the GT2 is making 870 HP at the crank. I will be posting the dyno sheet as soon as i get it from Tym. Hopefully, I will be able to post 60 - 130 times soon. The GT2 went 6.06 s on 93 octane. So we are definitely hoping to get into the 5's. This entire package is a bolt on package and no internal modifications are required. Stay tuned!

TB993tt

You guys will come unstuck if you get to use that performance, stock rods bend over 830NM with Euro use like below:

dk996tt

maybe Euro tuners use a different tuning strategy. i don't know. we have many P800 cars out on the road (93 octane pump gas running 700 rwhp) running safely all over the world. my sledgehammer is also running with no problem and it is making 850 rwhp on stock internals. maybe american tuners are getting better??? maybe german tuners don't know everything??? i don't know? just might be possible.

dk996tt

Switzer R850 dyno sheet - 783 RWHP @ 26 psi

TB993tt

Your graph may hold the answer: Your tune with the big turbos slow spool up seems to limit the low end torque (low end torque in particular stresses the rods as autobahn drivers will ride the torque in 6th gear from 3000rpm (maximum torque with properly tuned VTG GT2) to 5/6/7000rpm up and down - like my chart above) with the torque peaking at 5300rpm, this must be easier on the rods...... It does beg the question why one would want to give a 2009 VTG tech Porsche a torque curve shape from the late 80s - are you drag racing for money or something ?

Edit: Just took a look at the Switzer site where the vid shows your lower octane 6sec dyno run - the torque peaks at ~5700rpm according to the chart and is 630lb/ft (850NM) so allowing for a bit of "dynojettery" where whp and fwhp seem to be very similar in reality it seems your tuner has done a good job in limiting and tuning the delivery of the torque to save the rods

dk996tt

You are correct, that is definitely a key factor as to how we can make the power on stock internals. we like to refer to it as torque management.

TB993tt

Is there any chance of you sharing a Performance/drift box chart showing longitundinal Gs on a 60-130, I would love to see how the torque comes in and what Gs it pulls, particularly low down. Like this one on mine, booting the throttle at 50mph in 3rd. Do you have the file for the 60-130 run you did, if you want to send it to me I will extract the data (if you can't be bothered )

The long Gs are a representation of the actual engine torque so a run like below is a great insight into what is happening and how much stress those rods are under

Jean

Yes a similar graph would be interesting... I suspect that the Switzer should have higher torque peak given the higher boost level. But that is conditional to making it low enough in the RPMs range. Area under the curve will be narrower though most likely...i.e. area under the long Gs.

dk996tt

i will try to post a 60-130 graph soon. I took the GT2 for a drive today on the race gas setting. Holy Guacamole!!! Can you say "Baby Sledgehammer". This R850 is one serious package. I am NOT selling/trading my GT2 for the 16M. I can't wait to run the TT Gallardo and hopefully a Veyron. It's gonna be GOOD!!!

dk996tt

i found the 60 - 130 run for sledgehammer. this was when my sledgehammer was making 850 rwhp on stock internals. 60 - 130 mph in 4.86 s.

eclou

Toby your 60-130 run is almost identical to mine. With the added weight and AWD, what would you estimate the AWE package makes in terms of RS/CG horsepower?

TB993tt

Gene
700 for that 60-130 no doubt..... but not RS/CG hp

If KPG still posted here he would say I was "shifting the goal posts again" but there is no doubt these cars can be made to run some big power numbers - remember my car with just headers, 200 cell cats and the plug in ECU tune showed 615PS and 782NM on RS dyno which gave awesome acceleration up to 300kph - 26.3s FFS, that is very fast, maybe even two times in a row, but the VTGs were working too hard and on the third time the ECU put the engine into protect mode - these new systems are virtually unbreakable.....

I am very relaxed and happy that everyone is getting what they want, the real interesting times are to come when they start tuning the new DFI turbo which I would guess has been programmed to protect itself even more conservatively the question is can it be made to produce the goods for a 1/4mile, 60-130, 1mile or 0-300kph ?

eclou

^^ I think you are spot-on when considering the output vs safety/reliability. Making lots of HP cheap is possible, but making lots of HP reliable and consistent is not. Lots of cars make it to the VMax/mile events only to choke, sputter, & fail despite impressive dynos.

TB993tt

The "sledghammer" reffered to above was one of those spluttering around the 190mph mark wasn't it ? DK - was that ever resolved or was 190mph deemed "sufficient" ?

dk996tt

actually, the reason why sledgehammer shut down at 194 mph at the Texas mile was because there is a top speed limiter in the factory DME which was not removed. all US spec cars shut down at 194 mph. this is no longer a problem as that limiter has been removed.