Those numbers are very impressive. Congrats, keep us posted and most
important stay safe. All the best.

 

Ah, I know ARM, been there once seen the Porsches and Maseratis but I didn't know they deal directly with FVD.

I already have a full FVD setup with plenum, and their ECU module. Got it from BMC Air Filters in Ajman, amazing guys and amazing work they do there.

I'm interested in racing a GIAC Stage 2 porsche in UAE, not really a "race" just a friendly test to see where each ones ground is.

I know Extreme Performance deals with GIAC directly but I don't know of any 991s with GIAC tune in UAE yet :\

Thanks for the info though! Specially the warranty part, I didn't know about that.

-Hamad

 

This is so coll! Where is this place?

 

Solid numbers OP.

Your mph gain from the back half (from the 1/8 mile to 1/4 mile marker) is very interesting.

There are two 997.2's with the same motor as you (3.8 DI + PDK) that have trapped 135mph. Champion did it with their GIAC stage 2 package at PBIR. They did 9.83 at 135.1 mph using drag radials. Their 1/8 mile trap speed was 110 mph.

I did about seven 135mph passes at Famoso one day earlier this year on street tires. Highest trap was 135.6. All my 135.X passes were done with an 1/8 mile trap of between 108.X to 109.X.

So both the Champion car and my car gained about 25-27 mph on the back half.

You gained over 30 mph on the back half.

 

My goal for the bolt-ons was to add pull on the top end and it appears I hit the right combo. I think the headers and the Plenum are big contributing factors as well as the 104 race gas. I mixed 4 gallons into my 1/4 tank of 93 on the faster runs at San Antonio as compared to Ennis. I also mixed it in as soon as I got there. I ran at Ennis 3 runs without race fuel and then only added 3 gallons. The last run at Ennis was 130 but the 1/8 was 100, the other two runs after adding race gas were both about 27-28mph faster than the 1/8 speed. I think I posted the Ennis slips here as well but not sure what thread. If you are curious I can post them again. The car ran much better at SA but what I really had fund doing was driving it at COTA this past Sunday.

 

I don't like the insinuation that Corvettes are slow lol

 

Just the opposite, the 991tts is so fast, corvettes can't touch it.

At least if you have modded it as I have.

 

I have only ran my 991 TTS in the quarter mile at the Albuquerque Dragway during Goldrush Rally 7. DA was 9000 feet -- yikes!

I was running Torco 108 (their equivalent of MS109) and my best result was an ET of 11.2 in the high 124s. DA that high is a speed killer. It was the first fastest ET of all of the Goldrush rally cars -- slower only than the 918 (the winner) and the Veyron.

My car with GIAC Stage 2, Europipe IPD plenum suffers from heat soak. My ETs increase by .5 seconds by the third or fourth run. This was confirmed by dyno pulls on a Mustang AWD dyno -- the car was down 50 wheel horsepower by the third pull even with proper cooling fans everywhere.

My car just won for the fastest trap speed (147 mph) in the Street Class at Slipstream Racing Event's Roll out to Race Out Roll Races at Pocono Raceway. It set that result running MS109 race gas and after it had an hour to cool down during lunch. On that run it crushed my Renntech tuned E63 S. However after that run its trap speeds declined to more like 141-144 and my E63 S beat it the next two races.

Bottom line is that as currently configured the car has a real heat soak issue.

I expect that the Champion intercoolers will cure or at least great help this problem. But who knows when they will be out.

 

I think 109 is too high octane especially at your altitude. You should have less heat generated with no more than 104 and that mixed with 93. I know I have heat soak effects after three or four drag strip runs in my car. I think it's more a problem with the quarter mile than the track because at the track you have bursts to high speeds followed by lower speeds but you are always forcing air over the intercoolers at a much higher rate than just idling at the drag strip. Of course you also shut down for at least 45 minutes or an hour between 25 minute sessions when tracking as well. Drag racing you just go real fast shut down and go slowly back to the line and wait with the engine on idle.

I will definitely be looking to add those intercoolers later and maybe bump the turbos but for now I think I have a good combination because the car is generally among the fastest and I haven't had any really significant issues with it. One of the Camaro's had to leave early at COTA because of heat soak.

 

Yes my car was blazing fast at circuit of the Americas. If there was heat soak I didn't feel it like I felt that in the quarter-mile and will race events.

I have spoken with GIAC about race gas and they have told me that the stage to tune is actually optimized for MS 109 . I believe them as my car's ET I the quarter mile at Albuquerque Dragway fell by a full half second when I switched from 93 octane to MS109 on the same day

 

Oh yeah, I believe they can adjust the timing for that but they can't make it any cooler, there is more energy being released with 109, that is why you have the added trap speed and lower ET because of the additional HP. The excess energy not transferred to the wheels is lost as heat in the engine and drivetrain. So while you get more HP, you get more heat, there is always a trade off. I am just saying that 104 might be a better compromise to avoid the loss of performance due to the heat soak. At SA I got three 135 runs in a row using 4 gallons of 104 mixed with 4 gallons of 93 and after that it slowed down but it still stayed well over 130 which wasn't the case at Ennis the week before.

ETA, I think the FVD tune is good only up to 100 octane so not as aggressive with high performance fuel. The other thing about COTA is that there is no race fuel, you are getting their 93 or going to the corner store on 812 to buy Exxon 93. If we could up the octane there, we might have heat soak issues.

 

Unfortunately my car has the same heat soak problem on pump gas.

I first noticed the issue at a driving force club runway quarter-mile race event, which I was running on 93 octane, when I saw my traps speeds fall about 6 mph from the first run the subsequent runs. I then went to powerhaus performance in South Jersey and, while running 93 octane, put the car on their mustang all-wheel-drive dynamometer. Sure enough by the third pull, even with proper cooling fans everywhere, the car has lost 50 wheel horsepower and close to 60 wheel torque. The data showed that the car was pulling timing, presumably to keep the intake air temperature is at a reasonable level, and dumping fuel to protect the cats.

The car's intercooling is the problem. The stock intercooling cannot handle the added boost of the GIAC stage 2 tune for long periods of time. When my Porsche was cool after shutting down for an hour during lunch, it absolutely slaughtered my E 63. But in the next two runs my E63 beat the Porsche due to the Porsche's heat soak. My E63 S, even with Renntech full tune, has no heat soak issues and consistent ran traps of 141-142 in the roll races. The Porsche was as high as high 147s when cool and fell to high 130s-low 140s when hot.

I also wonder if the metal IPD plenum is one of the causes of the heat soak. The stock plenum is plastic which is obviously more resistant to heat.

 

I would think it's possible the Plenum is a factor (Patrick has mentioned that before), I have the IPD plenum which is aluminum but my heat soak issues aren't so bad and my tune is less aggressive. Maybe try dropping back to Stage 1?

 

My next mod are the Champion intercoolers. They will have lots more cooling capacity than stock and should solve the issue.

 

Anyone have any info about what the cost is going to be on the intercoolers?

What do the 997's run including install?