Boggess, lets say you leave the car in D mode, and from a dig, you feather the gas pedal...does it still try to race to redline before it shifts out of first to 2nd and so on?

Or does the trans act the way you described when you floor the pedal?

 

tiguy99, Thanks for the comment. I just took it for a spin to check this out. In D mode, with the VDC off, feathering the pedal pretty much jerks the car around a bit, and the rear wheels eventually break loose. The tranny doesn't seem to slip at all.

I know I have a traction issue, but even when I get a good launch, there is still a coordination issue between 1st and 2nd gear. To answer your question, it seems to occur when I floor the pedal.

 

No prob bro...I have the perfect solution! Ever tried 295/30/19 on the rear tires (assuming you have 19s thhat can support wide rubber)

http://www.tiredeals4less.com/TOYO_P...100W_P1984.cfm

It may help

 

Def get some stickier tires if you haven't already. I just ran some 295/35/18 Nitto NT05's and they pretty much solved my traction issues in 1st gear. They also rocked on the track.

 

Thanks fellas, yeah I definatley need sticker & wider tires. I am running Nitto NT555's 275/30R/20. The tread rating is 300, so not sticky at all. I just had my fenders rolled so I can put larger rubber on.

However, I still think my tranny has an issue. Canadian, does your tranny ever hit the rev-limiter and miss 2nd gear?

 

LOL. Thanks. It's the GTR's that will give us 5ATs a run for our money with their new transmissions. We should have a couple GTRs out at the airstrip event this year, so it'll be interesting to see if they mop up or have some trouble given the high hp 6MTs out there now.

 

Thanks John. It's great to see more 5AT with FI on the road! In regards to the 1-2 shift, I honestly never floor it in first gear because even my 295 PS2 summer tires can't hold that level of torque. Remember we have a very steep first gear as well as 2x torque multiplication for about the first 50 ft on a launch thanks to our torque converters. There's just no freaking way a street tire will hold. I'm switching to 305/30R19 R888 and I'm prettyr sure they won't hold first gear WOT launches either. Our first gear ratio is just too steep for a FI motor, plain and simple. You are in worse shape because your torque peaks so much earlier with the 530bb.

That said, feathering the throttle with a TC isn't easy. Too little and you will bog, too much and you will spin the tires and hit the rev limiter. What I have found works reasonably well is to just perform the 1-2 shift earlier in MM mode - say 6k rpms and raise the rev limiter (for me it's at 7200 rpms). I also decrease boost to wastegate pressure until the car reaches 25 mph. Of course, you need a standalone like the Haltech to configure launches like that...

In D mode, I guess you'd just have to let up as you approach redline...

 

Thanks for all the info Raj! I hope to check out your G in person at Zdayz.

 

You are welcome and I'm looking forward to seeing more folks FI with 5ATs out there. All the FI guys get lost in the swarm of NA cars though. We need to have badges that identify us as FI or NA and 6MT vs 5AT. That would be sweet!