:lol: Not sure why what I've got to say is so interesting! I agree it'll be interesting to see where it all ends up. The funniest thing is that there's absolutely nothing special on my car - nothing that couldn't be duplicated by anyone with a Supra! If it helps Kean and others sell this turbo then by all means buy 'em! Quite a few of the vendors here have been helpful to me including the two you mentioned.Olivier Caza said:I've been reading this since you posted and the replies you post are always VERY interesting. I'm glad you got your car squared away so well. It's one very powerful car, I just can't wait to see what kind of power you'll unleash from that setup.
I like the attitude of getting the most from a midsize turbo by upgrading everything around it, and still have very decent lag and spool up! I bet this turbo will be very popular for SP and BL in the next few months!
As to optimizing things - never forget that the engine is an air pump first and foremost. There are restrictions that lower VE on both the intake and exhaust side. Bumping boost ever higher is fine but remember that boost is a measure of restriction and not something absolutely related to HP production. 34PSI means 719RWHP for me now but with cams and a ported head lowering restriction I'll make the same power at a lower measured level of boost - the engine will be more effecient and less air will backup in the intake! What was surprising to me was to see that cams on another car actually lowered the spool up RPM, that was a surprise that I hope is duplicated on my car I learned this the hard way on my Mustang with a Paxton - ported heads and intake lowered measured boost by 3PSI but it made MORE power. We see this with stock twins vs single turbos too - 20PSI on one isn't the same as 20PSI on the other. Since I'm not willing to move to a bigger turbo and poorer spool optimizing everything else just seems like the way to go. However once I hit about 800RWHP I don't imagine wanting to go much further - those will likely be dyno Queen numbers anyway. Having more power at lower boost is really what I want - I'll be interested to see what effect this all has on spark timing and fuel. I expect to see less timing and more fuel - we'll see. I have to admit I'm kinda' sorta' wondering what about a 30shot of nitrous might get me in the way of spool too
Anyway, as I learn more I'll share it for sure. I'm not racing or anything and this is more a learning thing for me than anything else. <shrug>
P.S. Attached is my 34PSI run vs my T78 when it was set to 1.7BAR with pump and meth. Might be 1.8BAR - been awhile I wish I'd had the time and courage to run it full steam on race gas. Interesting to see where the lines diverge. Pretty sure these were both 4th gear runs FWIW. How folks can look at a dyno sheet and "see" spool is beyond me as I know the T78 spools about 400RPM more quickly, Hau can verify this too.
P.P.S. Putting info into the dyno files I noticed that the 700+ run has an altitude of 4500ft listed under conditions. I know that dyno is at a higher altitude in the foothills but I'm NOT sure that is the correct altitude. GRR! I'll take a GPS up there with me next time to verify - the other dyno is only 560ft and I GPS verified that myself!