NJ991

Am I the only one that reads that they are getting about 100whp for these NA bolt ons? That’s insane.

spdracerut

Difference between designing/manufacturing/selling for a street car and a race car without the same constraints/compromises.

4 Point 0

Does anyone have the part number for stock turbo's. : ) I need to compare to make sure I am looking at the correct size after market ones. Possibly G25 550's or G25 660's.

I already have the following:
Vektor Headers
Akrapovic Cats
IPD Plenum
BMC Filter
AMS Intercoolers
Pro Tune E30.

Full tractive Suspension
Brembo GTS BBK 380 front and rear.
TrofeoR

A 720S just has a touch more top end than me down the straight. COBB need to un lock more things to play with. I had a few issues with the latest versiona nd had to flash back to previous. But once they sort them, it should unlock more to play with.

With the Ferrari Pista about to be released here and the SF90's on the way, we need more power. So a pair of Garrett 550's or 660's should produce somewhere between 800-900Hp.


Garret

spdracerut

A pair of the G25-550s in the 0.72 A/R turbine housing should do about 900whp maxed out. I figure around 35psi of boost, give or take. If you need more power, Garrett should be releasing a G30-660 which is the same compressor as the G25-660, but with a larger turbine. The larger turbine of the G30 should have minimal impact on lag due to being a better size match to the compressor which results in a better blade speed ratio and therefore better turbine efficiency. That said, a G30 is a pretty big turbo for effectively 1.5L of displacement per turbo. Personally, I'd stick with the G25-550.

fsmich

What are the issues? I have the dreaded PTS-BRG- PDK stumble from 3rd to 4th at WOT. Just did a flash down to 40 less torque and will check it out tomorrow.

4 Point 0

The latest version when we installed at the track, Just prior to redline, there was a hesitation. Almost like fuel cut off. It did it 3 times in one lap, I pitted and we flashed back to our current version and tune and the car ran strong all day.

I love the COBB. It has transformed the car into a super car killer. However there is way more left on the table and COBB are dragging their feet. (COBB need to sort the fuel scalar not doing anything.)

Syvecs don't support 991.2 GTS, just Turbo. Motec have done a 991.1. The guy that did it will be in my area soon. Motec have asked him would he program the 991.2 for us. If he agrees then I will have the Motec, fully ECU replacement. That unlocks everything. Full flex fuel. That means it doesn't matter what amount of E85 you pour in the tank, it will adapt and adjust.

I want it NOW!!!! I still think the Motec guy will get that done long before COBB sorts things and releases more.

fsmich

Sounds like the same issue. I had 3 tunes done, a 93 "drag" map, a 91 street map, and "93 track" map that Mitch said was between the other two. The track map with lower torque did not stumble at the redline 3 to 4 shift today. But it did stumble on a Launch after spinning in first, then resuming in first only to spin 2nd. Launch Control for my tunes doesn't work, I'm a second slower to 60!

PTS-BRG

4 point 0: I am going to bet that this hesitation occurred at redline in 3rd or 4th gear right? If so, I don't think it has to do with the fuel, it is the same thing several of us are now experiencing.
If I may ask what the old tune parameters are when compared to the new "bad" flash? I am curious what was done to keep the hesitation from happening and why you wanted or needed a new tune?

Trying to piece this together to hand to Cobb on a silver platter to correct.

PTS-BRG

fsmich: We overlapped our posts.

Did Mitch do your tune? Well he did mine too and I actually called him about a month ago and asked if he knew what was going on. He didn't seem to keen to discuss it or have any real answers on how to resolve it.
If you also had Mitch tune your car and its still happening, then clearly he doesn't know how to correct it and we all have a big problem. Mitch wrote the software for Cobb and if he can't or won't fix it I dont know who can.

Mitch did something to my Launch as well and it wasn't good. I had him remove the PDK/Launch tweaks and now it functions like stock.
My car also seems to primarily stumble from launch control start but, not always the case. I need to re test my car to see what's going on..

fsmich

Mitch did mine and I have about 500 miles on the tunes. I haven't talked to him yet because i was hoping the PDK would adapt.

PTS-BRG

fsmich: Can you please post the specs on your car? PDK, GTS, AWD, etc.. THX

fsmich

C2S w/X51, PDK. Akra cat&muffler. Vektor headers.AMS intercoolers. BMC air filter

PTS-BRG

It seems the only thing we all have in common is PDK. Some of us have 2 wheel drive other AWD. Some have GTS and others base Carrera. It has to be some correlation between the PDK and the tunes.

PTS-BRG

Ok, I am following up on this issue.

My shift issue is gone. I don't know if it was the revised tune or the change of wheels but, today I tested my car and it shifted like a GT2RS and was Fast AF.
I would like to add it was set to Sports PLUS with traction control OFF. PDK Race Launch got me a 3.1 0-60 which I think is my best so far.
I was data logging the car on the COBB AP and also did some 0-60 and 1/4 mile times that were ferocious. Now I dont know how to recover them and post.
If anyone knows how to retrieve the 0-60 and 1/4 mile info from the AP please let me know how to do it.

In addition, if anyone can make sense of the Cobb AP logs (those I have) let me know if you would like to take a look.

THX

Rennolazine

Great to hear man its been a long time coming. Lets see if u can smoke the 458. I will say this. I did some pulls against my buddy’s 458 in the v10 plus, and its fast. Real fast. The v10 plus does the 1/4 in 10.6 (60-130 in 7.6) and i think both u and the rarri are not too far off.