Blown 944 Hybrid Stroker DIY Guide
#62
Rennlist Member
Thread Starter
#63
Rainman
Rennlist Member
Rennlist Member
Your basically talking my current 3.12L (4.03" bore, 94.75mm stroke). I am very happy with it but I am trying to get a bit more top end from about 5000-6500 rpm. It really performs amazingly up to about 5100 rpm. Hopefully the intake will show some improvement. The 16V head would be ideal as it would greatly improves flow and mach index. I would still go short runner/large plenum for the intake however. Duke's Green Hunter 16V motor ran a Supra style short runner intake and I think the performance across the whole power band was really outstanding.
How does the 3.12 perform between 1000-3000RPM? Is it a dog like a normal 2.5 or does it get up and go, even before the boost comes on?
#64
Rennlist Member
Thread Starter
At 1500 rpm my 3.12L makes more torque (about 140 ft-lbs) than my NA at any rpm! Compare the dyno with other 3L cars and you will see what 95 mm of stroke does for the bottom end! For a street car it is special.
#67
Rennlist Member
Thread Starter
I might have understated a bit, more like 150 ft lbs at 1500 rpm My NA has about 130 ft lbs MAX at the wheels across the whole power band.
#69
Race Car
I think a great combo would be a 95mm stroker with a gtx30. For a daily driver, it would be just flatout fun. Shift it at 6000 rpms and enjoy it. If I get tired of chasing big HP with these cars, that is exactly what I'm doing. I could imagine 300plus wht from 2200 rpms.
Depending on how far I get with the DSM this year, I may go to a smaller turbo. However, it's been a little while and I'm hoping my 3.0 will spool my turbo around 3500 rpms. I remember my last combo seemed to just tear the tires up as the torque came up.
my last dyno that corresponds to appx 125 in the quarter
Depending on how far I get with the DSM this year, I may go to a smaller turbo. However, it's been a little while and I'm hoping my 3.0 will spool my turbo around 3500 rpms. I remember my last combo seemed to just tear the tires up as the torque came up.
my last dyno that corresponds to appx 125 in the quarter
#70
Race Car
Actually the 86 blocks are ok too. The early blocks are a little thinner, but can still be straight sleeved (my last engine was an early block). My current 3.0 is an NA block.
#71
Rennlist Member
Thread Starter
And this is a 2.85L, very impressive. You can definitely see the near 86 mm stroke on the bottom also.
Good to know.
Good to know.
#72
that was what I was hoping to hear! the NA block I have is an 87 auto tensioner. I've heard of some of the guys using the NA head with different valves saying the NA valves can be ported to flow more on the exhuast side. With more displacement is that a better way to go or is it safer to stick with the 951 heads? Sorry to keep badgering you guys with the questions, just want to pick your brains!
#73
Race Car
For most engines, I'd stick to the 951 head (as far as exhaust goes). The exhaust flows very well already. I will find out this weekend what the stock exhaust can do with a few small mods.
Either way, you want the ports ceramic coated at the very least. I've tried an NA head, and it certainly slows the spoolup.
Either way, you want the ports ceramic coated at the very least. I've tried an NA head, and it certainly slows the spoolup.
#75
Race Car