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3.0 16V based on a S2 engine
Dry sleeved
JE pistons 8.0:1
Piston squirters from 968
Stock cams
Stock head
Custom intake
Com turbo (rated to 810hp, so will be changed to a smaller one next year)
S2 header with custom x-over
Link G4
1400cc injectors
larger IC
water/meth injection
353whp @ 0.8 Bar
How did you work out the angle to drill for the squirters ?
I am now running a GTX3576R instead of the GT3076R. Spool seems about the same to full boost (1 bar on street.) but not quite as dramatic an initial onset of boost. I suspect that there is more top end but I don't need it. My skills are behind the power this car makes.
I went GTX3076R 0.82 -> GTX3076R 1.06 -> GTX3576R 0.82, all running 1.2 bar of boost.
With the stock intake and 9R cam on my 3L 8V perhaps the best set up was the GTX3076R 1.06. It spooled ~300 rpm later than the GTX3076R .82, and felt more frantic than the GTX3576R 0.82, which spools hardly any later looking at the logs while feeling slightly lazier but allowing more torque from the moment it gets into boost. I probably picked 5 to 10% hp with the GTX3576R 0.82 but the engine felt smoother and more lively with the GTX3076R 1.06.
The GTX3076R 0.82 made the strongest mid range, at the cost of running out of breath past 5500 rpm and actually putting too much strain on the block as I regularly got coolant overflow then.
I will be staying with the GTX3576R 0.82 as my soon-to-be-reinstalled custom intake will give it the room it needs to maximize top end power, even for street use, and even if it does not spool as convincingly as the GTX3076R 1.06.
If a Euro guy is looking for a GTX3076R with either the 0.82 or 1.06 (or both) Tial V-band turbine housings, pm me an offer.
Just for the record, spool considerations with these GT turbos is not so much important as when running a KKK-style turbine, as the breathing ability beyond 6k rpm is MUCH improved and by then it does not really matter anymore if the turbo reaches, say, 1 bar of boost at 3k rpm, as there is nearly none of the parachute effect that shows it ugly face when revving past ~5500rpm with a KKK-style turbine. Freeing up about 1k rpm worth of usable power band up top more than compensates IMO for the couple of hundreds rpm of spool that may be lost down low. At least that's how I felt when I first upgraded from my T4/KKK hybrid to the GTX3076R 0.82.
No my first turbo was a GT3076R 1.06. Something happened to it and I started seeing turbo out air temps of 300-500°F. Thought about getting it rebuilt but went to GTX3582R. I forget the A/R on it. I may try to have the GT3076R rebuilt into a GTX. Is that even possible?
Probably not much chance you're still on this list but just in case, can you tell me the make and weight of the flywheel you used, maybe some impression of how that worked for you? I'll be installing a Spec III+ in my 89 S2 next month and haven't made up my mind on the lightweight flywheel. I've heard not to go lighter than 16 lbs on a 944 engine as it can cause harmonic balance problems and problems with the TT, but there are so few 3.0L Turbos I've never heard from anyone who's done it for that motor (as if any of them were the same).
Last edited by Pfc. Parts; 12-29-2014 at 03:27 AM.
Reason: spelling
Looks very similar to the blocks we have refinished here in Sydney.
Here is one of our latest 3.0ltr blocks. First pictures with a dry bore, you can see its got a slight matt finish to it, the last one with the pistons installed and oil on the bore. I take it your machine shop has done this finish before, if so i think you can trust their work
Regards
Sean
11-02-2014, 06:04 PM
