Nick, what do you think is a fair % when working out whp to bhp? It seems the general consensus is ~15% but our local PC uses 1.32 (IIRC). My 3L is very close to going on engine dyno so it will be interesting to see what the returns are on the wheel dyno as well.

 

That's probably quite right. I have this situation now with the S2 final drive and the VR S5 turbo. Still, the boost gauge hits 1.5bar pretty quickly once you're into the high 3's.

 

The 968 turbo S/RS used a longer crown wheel and pinion than the regular 968.
I have not driven one but from what I can understand of the diagrams it would certainly feel like the usual 951 AOR trans split in 6 gears, in the same way that the regular 968 transmission feels like a 944 S2 trans split in 6 gears.
Only the 5th gear pinion seems different between the S/RS and the regular 968's.
At last but not least the 75% LSD must be fun in the rain

See Konstantin's website for info on the S/RS gear ratios.
http://www.968turbo.de/968.html

 

I was going to ask some others what they see for boost in the 1&2 gears and when they see it.

I agree that it is a slight deception for power but when rolling on I get through 1&2 quick and then the fun starts. I am sure there are better setups than mine but I am curious what a gt35 on a 2.5 L sees in 1 & 2? (interested in that turbo b/c that is what size is needed IMO to make 450+ hp)

I have found that the larger turbo keeps tirespin down too (read: I see 20 psi in first at ~ 5.5k and 23psi in second at ~5k.

Just curious

 

Well that's a good point too Sid. In terms of keeping the driveline intact too. So in other words by not having instant onset of power low down, it can be a way of delaying the stresses to the CVs, axles, gears etc and that's a good thing with 450+, yes? A track car will be spending most of it's time above 4500rpm and not have to do really hard launches like on the dragstrip. Our first 2 gears are really just to get us rolling.

 

Id love to, but its in german.

 

Thom, sorry but you are mistaken. The info and charts on there are for the Turbo S not the RS. They do not share the same final drive. I know because I came across 2 RS boxes and did the research myself, I have the RS and S info on the same chart and I can tell you for 100% the RS has the same ratios and final drive as the standard 968 6 speed.

 

Patrick I am not sure, I don't have anything concrete on this. I gave up on dyno figures a long time ago, they don't mean much more than a general indication. Its how the car drives that counts as I am sure you will agree. Dynos are of course good for tuning standalones and relieving oneself of some hard earned cash in a short space of time!

 

For sure Nick. It's a tuning device really. Sure it's nice to see a number to give you an idea of where your money has gone but there is too much scope for variation to take it seriously. I will post numbers when I get them but that won't make me faster around the track. Having too much hp will probably make me slower

 

Thanks Nick.
I came across 2 RS gearboxes as well which I was very interested in buying but now that I know the final drive is the same as the regular 6 speed I'm happy I skipped them!