6 cylinders & 2 turbos, for now

[Super Bleeder!!]

Thats great that you want a good powerband, but powerbands dont dictate needing a built motor, for the most part. Just seems like money you could have invested in other parts of the build.

Oh well, just my opinion. Carry on.

[Halon]

I like the higher compression choice. Higher compression = more off boost torque. Higher compression also = more power at less boost. Both of those = slightly widened power band.

Does higher compression also induce quicker spool? I've heard both sides, some say yes (reasoning being duh of course), and some say no (reason being the stroke is still the same, and the same volume of air is being moved). Anyone with some real world experience have any feedback on that?

As for whether or not the money could be spent wiser elsewhere, in the end I suppose that depends on the individuals viewpoint, and any exisiting conditions. If you know Kerry, he seems to like to overbuild things. The motor was higher milage and starting to burn some oil, so it was coming out anyway. So building it now was more a convenience factor as well.

To each their own I say :)

[niterydr]

67mm powerband...drool....

[turbotalon1g]

^Busch nuts and I think STM did testing with a 10:1 motor vs stock in teh evos and i think a 8.5:1 and 10.1:1 motor and there was no difference in spool but the off boost power was there, I believe mullen of mullen tuning reported the same thing since he just got a 10.1:1 motor.

Either way, i love the off boost torque of higher comp. motors esp. in DSMs.
I think Joe's opinion is that well a 2JZ could easily handle the power of a 6765 on the stock bottom end, why I'm sure he has seen it first hand, a local "supra shaun" made 750+ i believe at DB and his motor is basically cams and headstuds I think, i think he made 825 on a setup as well, not sure if that is old or new.

I know I got to see a ton of stock bottom end supras in TX running around with 67mm setups or bigger on stock bottom ends all day.
But if you got the $$$ and you want to, why not? I'm sure you will more confident about it once its built.

Good luck, I can't wait to see this done, let me know if you want a hand with reassembly.

[Halon]

Yeah that makes the most sense to me. Higher compression would not increase spool, in the end you are still pushing that same amount of air.

But it would move the power band a little bit left due to the added off-boost torque and the fact that you will make more power at less boost.

I wonder what those new billet 67's are capable of supporting power-wise. I'd guess maybe 900 if you maxed the sucker out maybe??

[tpunx99GSX]

Were you driving around maple grove the other day? I think i saw you.

[goodhart]

^^ LOL, It's been sitting with no engine for over a month now Tom.

[turbotalon1g]

If I were to guess, I bet shane could answer that with an accurate answer, but I think they are the best turbo for the street on a supra, you won't get beat by too much if any.

If i had to guess, I'd say close 850 for sure. The kid i met in SA, made 700 on his and he was at about 27-28ish psi

[Shane@DBPerformance]

Yea, compression does not increase spoolup. It can make more power at say 5psi or boost during spoolup though, to kinda make it seem like it's spooling fast, if you don't have boost on the dyno chart. E85 makes turbos spool faster. With an auto though, powerband is different, if you set up the torque converter correctly it will avoid lag from a roll and instantly go right to where your turbo spools anyways. You be driving down the road at 3000 RPMs normally, then floor it and and it will instantly flash to 5000 or whatever RPMs and the turbo is spooled. And then it stays spooled through the gears. It also goes through the RPMs differently than a manual. A dyno chart for an auto car with a properly setup convertor with RPM on the bottom might look like it has no powerband, but then when you look at it vs MPH you realize that it just spends a long time barely moving through the RPMs, but it is going through a big mph range. The billet 67 is a great turbo though on anything from Hondas to Mustangs.

I hope it will be running on E85 with that compression. The 2JZ are fairly knock prone with their 8.5:1 compression on pump gas.

[95talonracer]

It will definitely be on e85 and I guess it will be in Shanes hands to see what this thing will make for power. Shane have you tuned with proefi before? Looks to be the kick ass tuning setup for these things.

Yes I built the motor because it was higher miles, smoked a bit, and it had oil leaking issues. I am not going to skip on anything on this car and don't have to worry about saving money here to spend there because it is a project that will be at least a year or more until it's done so I have time.