safe boost levels with GTR tranny

[nerd racing]

instant torque in lower gears from a smaller turbo is what hurts the transmissions. I am pro-bigger turbo, not sure why there is an argument on your part.

[jay]

Yep, bigger tq in lower gears flexes clustershafts giving the operator a cluster****. But bigger turbos make even bigger tq at higher rpm, where a clustershaft can just as easily turn into a cluster****, so it doesn't make much sense to me why the smaller turbo has a better chance to make a cluster**** but there is more than some small evidence to support the notion. I wish I'd gotten a dyno sheet from my GTX when it was bpt'd with the vj20. Cuz yes indeedy I stripped all the teeth offa 2nd gear just on the street rolling start and all with that setup and have yet to do such a thing with the gtr/vj23. And the gtr/vj23 is strong enough to break all 4 loose on dry tarmac in the first three gears on any kind of a corner. I don't think the small-turbo-shockload theory holds water; once my current car has some revs, if I floor it, it screams to max boost as fast as the vj20 did and with a great deal more forward thrust. I wonder if there's somehow more of a tq load effect for X amount of tq @lowRPM that is more damaging than that same amount of tq at high rpm in the same gear. Or maybe my memory just sucks and the vj20 was far more instanton that I recall and that's the whole reason. This is prolly the most likely answer. goldern old fart with memory loss.
I bet the turbo on my rallycar is way too big and I should buy a 2560. Too bad I'm broke :p

[atomicEGT]

I think there's arguments to be made either way, I feel like a bunch of torque down low (like with instant boost VJ turbos) is more damaging than a similar amount or more a bit higher in the RPM band... If I had more transmissions and time I would stress-test them to find out, haha

I will point out that even with a VJ20 and unsprung 6-puck (and 7000rpm rolling 3rd gear clutch drops at 50-60) I STILL couldn't kill a G-series, so maybe it's the driver?

[deadly_sleeper]

It's 80% the driver. There is another member which I won't name, that keeps snapping axles with the vj20 turbo and street tires. You could have a weak or strong setup, with with a crappy driver, you can still break it. It's all about knowing what you can and can't/shouldn't do with the car.

[josh95mx]

I am running a ceramic 6 puc sprung hub clutch on my AWD RS and it makes the difference. I have not broken a tranny since i went to a sprung hub clutch disk, I am sure if I wanted to I could. I was running 15psi on the VF12 for about a year with 460's on the AWD platform, but i go easy on the launches that seems to be one of the biggest killers. Interested to see how it is going to react with the new 16G. But I think it mostly has to do with the operator and knowing what you can and cant do...

Jay if you are that good with programming then I may have to hit you up when I finish my stand alone install

[jay]

Hah... I bet I'm a goldern hack. Right now I gotta go back out there an' find out why I got no joy at the fuel pumps. I suppose I should be ecstatic that it has spark and ECU sees RPM when I crank it over, and the injectors at least make clicky noises, first time outta the box.

[nickz]

If I could add,the first time I took out the gtx for a shake down on a bpt I gave er very little gas off the line, slipped the clutch,floored it and that mother took off like a scalded cat i tell ya.I could feel a rear wheel break free a bit, a front wheel break free,all this in a matter of seconds.Literally clawing the road!I never did that again.lol.
My gtr is a completely different animal,it has no instant boost, just way more top end.
Not sure which is worse for the tranny,but fortunately I pussy foot my heap off the line.