What I want to know is how you guys can spin the tires "at 80mph" or at "the top of third on the highway" with ~550 rwhp/tq? That just doesn't seem possible in an AWD 996. Sounds more like a slipping clutch to me ...

 

Dude, No offense taken. The Stage4GT goes numb at approx 5k RPM, and then takes off again. Your Upsolute program catches up during that Numb Zone. Feels like she's running lean uptop, but then it kicks in again, so I doubt its lack of fuel. Then again, Not too technical on that, but as I have stated, this is not 100% engineered. I am awaiting a prompt fix to this issue. Garrett Needs to get involved and look a little closer at his program. My previous Stage 4 program ran like a charm. I hope my Stage 4 GT program will.........real soon.

-Rs

ps: Let me know if you plan on coming to FL, I would like to videotape the 130mph waterpuddle road test, and see what thats all about.

 

Here is the DYNO Chart and A/F ratio chart with boost:

 

Cool... I'll keep you posted. Going to the sporting goods store now to pick up snorkles and fins 'cause I'm not sure what's involved in the test... let me know if you want me to snag a set for you...

 

I will fill the tank this weekend with Race Fuel and see if there is any difference in feel of the car.

 

If you really want to know the state of tune of your car, have your shop datalog the runs with regular and race gas.

You see, race gas (higher octane) in itself does not give you more power. In fact, in some cases, you may lose just a tiny bit.

The reason higher octane results in higher hp is because it allows your ECU to run more advance timing. The higher octane the gas is, the slower it burns, resulting in a slower-advancing flame front. This is why the engine is less likely to knock/ping when running higher octane fuel.

Have your shop datalog your timing advance parameters with regular gas. Then, go fill up on race gas, drive around so that the ECU gets a chance to re-learn, and then, do another datalog.

IF your hp readings stay the same, and your timing advance doesn't change, then your ECU mappings and parameters is in need of tuning.

 

Todd-
I would still love to see the dyno charts you have on your Stage IVGT kit on 91 Octane. Hope you can post it soon.
Thx.

 

SHANK / Stephen / Tod / Garrett-> Is this still more of the same problems you have encountered with your GT2 setup, or is this something all Stage 4 GT owners need updated?

Mike

 

Funny you noticed that. I get that same feeling. Almost like it's pulling timing or something. However, I'm running really rich too... and not boosting all that much (1.1/1.2). Could be the hot weather or some other problem with my car.

 

I have taken a look at your charts and really see nothing wrong.

The dyno "Heartbreaker" at KTR has seen many cars that are copies of cars that I have worked on and dyno'd elsewhere. Let me say that the dyno there has some pretty mean numbers.

What I always tell my clients is not to worry about the numbers, but what are the improvements and loses vs whatever point you started at.

There is no realistic way to say that the dyno was operated incorrectly, or the wrong gear, weight ... From here. A full load dyno shows a very small difference from one gear to the other.

IMO a full load machine is much better at looking at tuning than an inerial type as the car experiences more load.

Have you spoken to KTR about your displeasure? I have always found them very responsive.

If you have any questions feel free to call or email.

Jeff

 

I _hate_ dynos lol:P

 

Hey Alex,

Your tip should dyno on a Mustang AWD dyno, as their front and rear rollers are mechanically linked. You know... just in case you are really interested in your numbers. I know all of us are!

Stephen

 

It'll dyno but just like at the shoot out where it freaked out... it doesn't want to hold gear. It upshifts and misbehaves at 4100rpms for some reason It's fine on the road and goes to redline but not on a dyno thus far...

The only way would be for me to find a dyno that'd let me be in the final gear and go way past 160mph lol:P I wonder if there are any like that?

 

My car looses power at 5500 and then picks up again. This is a limitation of the engine with low octane fuel. If you use 100 octane and re-train the ECU, this will mostly disappear, unless you are running very high boost.

 

That's not something that I have ever experienced with my car. I've put about 9 months and 4500 miles since the stege 4gt upgrade.

The only issue I have ever had is in very cold weather the car will spin all four wheels into third gear, which will cause the traction control to go a but crazy and cut power. But, turn it off and there is no issue.