jlturpin

Some really cool feedback on the GT30 in this for sale tread. I'll have to look into this option

lee101315

Thats what he calls the "retard factor"...lol

porshhhh951

This is a standard thrust bearing turbo though correct?

seattle951

Double Ball bearing turbos like the GT30R have an oil restrictor valve to drastically reduce the amount of oil into the turbo. I have not seen a dry option for the GT30R.

The LR75 that was sold was a journal bearing design that had much higher oil flow.

blown 944

to the 6 speed ideas

having ridden in a 6 speed k27/6 car I feel it is great for around town and lower boost levels. First and second really are useless for power IMO. If it had a taller R&P it would be perfect though. I was just talking with Tom at Carquip this last week about Joe's and the R&P is not an inexpensive affair like over 3k for the parts ...yikes.

However, I did like the take off so much that I just installed the S2. Drove it for the first time today and I have to admit I think I will like this for my DD a little better

seattle951

My first gear reminds me a late 60s muscle car. Hit the gas a little too hard around 2500 rpms and smoke the tires. (I have 295s in the rear.) This is great for a muscle car but not what you normally want in a sports car. The first to second gear shift comes up so quickly that I can't react quickly enough.

Assuming I don't sell the car, I will definately being doing something about this in the Spring after my next set of engine upgrades (cam, valve springs, retainers, wastegate, intake manifold, ect). It would probably not be a good idea to mess with the gearing until I arrive at my final engine power curve. At $3k in parts + $x in labor, this is not something that I would want to do twice or more.

95ONE

When you get close to 400hp. The 5 speed 1st and 2nd are totally useless. but having the others a decent amount apart are actually a good thing.

95ONE

Everyone should have one.

333pg333

So Sid, have you changed over completely to an S2 tranny or just the r&p? I think there is little difference anyway. I really like my 951s tranny with the S2 r&p and have had it like this at least for one of my previous 3L builds (but only on run in boost and rpm). Still I liked it then and I love it now with only the 2.5L and bigger VR S5 turbo kit. In fact it's probably the only reason I can live with the oversized turbo kit. You will love it around town and on the track inc 1/4 mile I reckon. On the Hwy it's a bit short but I still have cruise so on the occasional times I'm traveling, it's ok. I don't really see the problems with 1st and 2nd gears. Unless you really do traffic light races and dump the clutch, it's no problem. Even then it's just a matter of changing the gears quickly and accurately. Again no problem. The only concern I would have is creating extra load through the driveline...I think? Then again maybe having longer gearing puts more load on in a way? Any takers on this question?

Duke

Just the S2 r&p in a 951 box must be the "worst" alternative, making the 5th gear super short. 239 km/h real speed @ 6500 rpm in 5th gear!

333pg333

Actually I've seen 245kmh indicated and it felt like there was a bit more left for sure Duke. As far as being the worst, well it's all totally relevant. For the street it's great and for all but really long super high speed tracks it's also great. Acceleration is fantastic!
There's no perfect gearbox in reality.

Duke

By worst I meant the shortest alterantive, for a 3.0l I think you would spend too much time changing gears instead of accelerating the car.
Even if it feels quicker it does not necessarily be the fastest alternative. But on a 2.5l I do see the point!

blown 944

Yes Patrick I finally did it, it is an S2. My daily commute has probably 15-20 lights and this is a better fit it does wind out just a tad more on the highway.

Along with some other changes.

Like I said for lower boost it seems to work good around town. Higher boost/HP would need less gear IMO

I am currently de-tuning my DD car to a degree so I can be a little safer on the roads.

jasonlp

Can't be that much shorter then the n/a r&p 5th?

blown 944

it's a bit different than that

the na has a total final drive of 2.83
the turbo has a total final of 2.79
Patrick's setup is ~ 3.22

the only one of the NA variety that would be close is the "S" it uses the same gearing as the turbo but with a 3.889 vs 3.37 for the turbo for the R&P.