Colossus' Build /Turbo Comparison - A Long Time Coming-

[colossus]

Damn I addressed these in my analysis that got wiped out in my 2nd post yesterday. .. I will try to re type it today...blahh
But TSB. Keep in mind u did hav a very, very different turbine than I have

[vr4tune]

Nothing changed but turbos right? Not even the cam gears or any thing else that may sound insignificant?

[TurboSinceBirth]

Damn I addressed these in my analysis that got wiped out in my 2nd post yesterday. .. I will try to re type it today...blahh
But TSB. Keep in mind u did hav a very, very different turbine than I have

9 blades instead of 12. Less rotational mass yes and less of a restriction. Still, you're running 9 blade DR-750s correct? You just ordered them not 6 months to a year ago when Matt had some Ti-Al 11 blade DR-750s left. You ordered them recently so it had to be the 9 blade turbine wheel which would be very similar to what I ran in the Devastators and even probably with some thinner blades. I think there's still some optimizing to do if nothing else because of the huge difference between the peak tq and hp. Eric had a difference of 50 but it looks like you have more which kind of leads me to believe the upper end to the right isn't quite right and still a little lazy.

You may still decide my turbine wheel is do different. Well, let's do an apples to apples comparison then on the hotside if that's the case. Take Sin'sVR4's MTC 19T car.



It had the same hotside TD04HL as your Devastators. You felt the 12 blade turbine couldn't flow anymore past the 19 psi you had because of too much backpressure. Well, Sin made 551whp 641trq @ 26psi - quite a bit more power and torque than your numbers even if you were to factor in yours were low. All that airflow has to go through the exhaust so that 12 blade is still able to push that much out whether or not you're running pump, pump + meth, or E85 in this case. The hp on Sin's car holds better in the higher rpms while the tq is probably marginally better than yours. Throwing in some race gas would show you whether there's improvements with a higher octane fuel. Maybe nothing is wrong with your car and I'm seeing things. You've come a long ways and only deserve a well rounded car. If it's where you wanted and you're happy that's all that matters so don't have to worry about me. I am curious though when do you start building boost and when do you hit 22 psi with the 750s? If you're spooling slow or dropping towards redline there could be something else going on.

[familyMAN]

Until track time, no way to know if the power is off compared to others. Sin's numbers are highly corrected for altitude. Look at his recent traps for his real numbers.

[NOMIEZVR4]

Yep..completely agree. There is no way in hell a 550/641 car should be trapping in the teens.

[TurboSinceBirth]

Until track time, no way to know if the power is off compared to others. Sin's numbers are highly corrected for altitude. Look at his recent traps for his real numbers.

117mph is a little slow for his numbers and I just realized I don't think he had a dyno graph past 4k rpms. Oops. Even looking at numerous TD04HL dynos and proven track numbers what I guess I'm getting at is the hotside isn't limited to 350-500AWP. Billet DR-650s already made more than that and Ray proved it at the track. There are a number of people that went to the track with 19Ts making plenty of power. Dale may have had clipped TD04HL turbine wheels but he set the TD04 dyno and track record for quite some time.

[familyMAN]

Peak boost usually comes at or near peak tq so that's easy to see from what was posted already.

You are seeing something I'm not. HP is basically flat for 2500 rpm just like all the others posted. If this dyno really reads 20-25% low than the numbers are on par with other td04s at 20-23 psi. And this isn't e85 which Chris has proven, back to back, no changes makes a big difference.

[TurboSinceBirth]

It was closer than I thought. Given the dyno reading low it's about where they should be. Matt's stock motor came on with power sooner probably due to the Ti-AL backside vs Josh's slower spooling 9 blade cast TD04HL wheel. With Josh's build motor, heads, cam gears, meth, etc it could explain the higher initial torque peak above and beyond the hp curve. It's probably close to where he should be and will see higher numbers on a different dyno. There is some tweaking that can be done considering the curve on the graph for Matt's car follows Josh's yet he had a stock motor, ARC-2 with no timing control, etc. At least it's a little easier to see things with the overlay. The scaling made it look a little off to me I guess.

DR-750.jpg

[colossus]

It had the same hotside TD04HL as your Devastators. You felt the 12 blade turbine couldn't flow anymore past the 19 psi you had because of too much backpressure. Well, Sin made 551whp 641trq @ 26psi - quite a bit more power and torque than your numbers even if you were to factor in yours were low. All that airflow has to go through the exhaust so that 12 blade is still able to push that much out whether or not you're running pump, pump + meth, or E85 in this case. The hp on Sin's car holds better in the higher rpms while the tq is probably marginally better than yours. Throwing in some race gas would show you whether there's improvements with a higher octane fuel. Maybe nothing is wrong with your car and I'm seeing things. You've come a long ways and only deserve a well rounded car. If it's where you wanted

Sin's Vr4 was running your 9 blade HL turbine blade. Not my 12 blade! He got one of the 3 made. Also I believe he was running e85.

[Chris@Rvengeperformance]

Tons of cars have made 450+ on even the L turbine. The new DR650s are just a clipped L turbine.

The normal 12 blade HL wheel has many times made 500+