EFR 6258 vs 6758
#21
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If E85 is available, that's likely your best bet for safely increasing boost and timing for more power. This would require an upgraded e85 compatible pump, 750-1000cc injectors and obviously some tuning (you may have some of these items already).
This turbo will flow a max of 44lbs/hr which is roughly 440hp. As others have stated, nearing 400hp (and sometimes less than that) the drivetrain is on borrowed time even with a 6-speed and a torsen.
I have to ask, if its a rocket already and your are happy with it, why not just drive it for a while?
This turbo will flow a max of 44lbs/hr which is roughly 440hp. As others have stated, nearing 400hp (and sometimes less than that) the drivetrain is on borrowed time even with a 6-speed and a torsen.
I have to ask, if its a rocket already and your are happy with it, why not just drive it for a while?
#23
You know what. I think maybe everyone else did all this math for non compressed flow. A car turbo pushing 300cfm at 30 psi (should be closer to 450hp) through 5 feet of 2" ic piping with 4 90° bends is only losing loosing ~0.14 psi to pumping loss. A normal 12psi @ 170cfm 250hp setup is loosing like 0.08psi in the piping. I estimated each 90° bend at r=2d to be equal to an additional foot of pipe for my rough math. Looking at the numbers thats nothing I'd worry about, its still typically being eclipsed by the IC at that point. The fact that my math draws the conclusion that everyone over looked a basic condition kind of makes me want to do it over tomorrow.
#24
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Since when did The Forum Collective decide that Torsens and MSM diffs are questionable at 400whp? Are there a bunch of broken diffs that I haven't seen?
IMO, the diff is bombproof. Axles too, as long as it's a street car that doesn't get launched. Tranny needs to go at 400whp, though.
IMO, the diff is bombproof. Axles too, as long as it's a street car that doesn't get launched. Tranny needs to go at 400whp, though.
#26
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Since when did The Forum Collective decide that Torsens and MSM diffs are questionable at 400whp? Are there a bunch of broken diffs that I haven't seen?
IMO, the diff is bombproof. Axles too, as long as it's a street car that doesn't get launched. Tranny needs to go at 400whp, though.
IMO, the diff is bombproof. Axles too, as long as it's a street car that doesn't get launched. Tranny needs to go at 400whp, though.
#27
My Torsen blew up at the dragstrip, but it took a prepared (sticky) surface and wheel hop to get there. Before that, it survived countless launches at autocrosses, etc. As long as the wheels can spin, it acts as a fuse for driveline components (except for the transmission which, as Sav points out, has a finite torque capacity).
#35
Drag radial will not dead hook most the time. It will hop, and because it is stickier than most others it will cause way more damage than some dinky all season which will spin like crazy.
A wrinkle wall slick will load up and dead hook, which is what he was getting at.
*edit: +1 what smurf is saying
A wrinkle wall slick will load up and dead hook, which is what he was getting at.
*edit: +1 what smurf is saying
#39
yeah.... good luck getting to MBT on 93oct and >20psi, no matter what your compression ratio is.
I'm fairly certain my 400whp, 93oct, 25psi(?) tune was detonating and I think it was single-digit timing in boost.
For "ultimate glory" I'd do:
- EFR 7163
- E85
- boost by gear
- traction control
- dual-port wastegate and 4 port EBC solenoid so you can run lower psi in first few gears
I'm fairly certain my 400whp, 93oct, 25psi(?) tune was detonating and I think it was single-digit timing in boost.
For "ultimate glory" I'd do:
- EFR 7163
- E85
- boost by gear
- traction control
- dual-port wastegate and 4 port EBC solenoid so you can run lower psi in first few gears