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

[JasonY]

Only accurate/realistic ones

Sounds like my FD might be a sub 200rwhp car on it..lol

Jason

[sergechronos]

Heck, on that dyno a stock VR4 could be a sub 200awhp car lol. Brutal dyno. Can't wait to read the comparison/reviews though.

[wingnut]

...subscribed

[mb3000]

+1 for the graphs not looking right...

[CoopKill]

Interested to say the least. Glad I will be on a DynoJet. Lol


Sent from the Man Cave!

[colossus]

Tried to post up my analysis but I lost all of it on accident. Will try again later. I am doing a direct dynojet comparison which should be fun.
Should be about a 25 % difference in power.

[sergechronos]

I believe the comparison is something like this:

[TurboSinceBirth]

The dyno numbers don't really matter too much. It's probably reading low. What gets me is how quickly your torque is dropping off with both DR-750s and Devastators not just the 12 blade TD04HL turbine wheel like you thought was the issue. You can even see how much higher your torque goes than the hp but everything peaks out and falls on its face. Maybe it's just how I'm perceiving it and that much of a torque drop off is ok. Given the results of other DR-750 owners even on stock motors it still doesn't seem to add up.

Matt's stock motor DR-750s on a Snow Meth kit and an archaic ARC-2 not a full standalone had less torque drop at 23 psi. He made more power and torque plus I'm sure the scaling is different but I think there may still be something up with the car.



Look at Bob's built motor like yours and even with a 19T TD04HL turbo he had even less torque drop.


Eric ran more boost on pump + meth with 750s but you still get the same idea.


Ray had a built motor also and while running cams plus ethanol will make a difference peak power let alone how much more boost he could run you still see a similar trend.



I was talking to Von on 3STech about some of the dyno numbers since the curves didn't quite make sense. Maybe it's just me but I think you should have more area under the curve over to the right for both the hp and tq. When comparing your car to stock motor TD04 dynos with a 12 blade TD04HL turbine wheel and even stock motor or built motor DR-750s there are still differences. Von hadn't clarified yet but he seemed to think your car was octane limited more than anything for making more power which may or may not explain the power to the right also. Throwing in some higher octane would narrow that down. I'm curious how much boost you're able to run on only pump no meth. If it's quite a bit lower than the 19-22 psi I guess that would explain no increasing in power above 19 psi for the Devastators because you simply wouldn't have a high enough octane to make power. I would think on pump only you would be knock limited at 13-15 psi on both turbos due to the huge increase in airflow they will move. I can say for a fact that the Devastators will for sure move quite a bit more air up to 32 psi tested and there is no loss up top. I regularly kept up with 130-135 trap cars on the highway easily so you definitely won't be tapped out on either turbo. I would honestly be not concerned so much about hitting a higher number on another dyno since your torque already peaks fast and high but figuring out how you can carry those peak hp and torque numbers a little better further to the right. I don't know exactly what your fuel and timing looks like.

[familyMAN]

I don't believe josh was saying he was knocking; just that they weren't making more power with additional boost. If its a knock problem, you would think Von would have tuned out that big torque (high cylinder pressure) spike.

I guess timing couple be in the basement up top because of noise from octane limitation but that wasn't described here.

You are correct though...a splash of race gas would answer but this car may be a pump/meth only car....

Edit: also look at HP. It stays about flat for 2500ish rpm, just like Matt's and Rays.

[TurboSinceBirth]

I don't believe josh was saying he was knocking; just that they weren't making more power with additional boost. If its a knock problem, you would think Von would have tuned out that big torque (high cylinder pressure) spike.

I guess timing couple be in the basement up top because of noise from octane limitation but that wasn't described here.

I know he said he wasn't knocking. Could it have not been knocking because he was already spraying so much meth the knock sensor didn't pick anything up? If you're not picking up more torque or similar gains as before you probably found MBT. It seems like spraying meth is usually good for another 5-6 psi over pump gas alone. Not making more power because the turbos are spent doesn't make sense. Sure torque is dropping off but look how high and fast it peaks at first going much higher than even hp. Compare to other similar setups and he definitely shouldn't be limited to more power with enough octane from either meth or adding some race gas in. I wonder when Josh sees full boost if that's even close to where it should be around 2800-3k rpms or so. Another guy on here with DR-750s found out his crank cog was off a tooth which would explain his similar torque nose dive and low trap speeds at the track running low 20s boost. I guess I still feel something is amiss.