comparison test 57 vs 50 trim

[mopar2ya]

that coinsides with the power loss going from 15 to 20 psi...

[Ondonti]

Well, that just shows how important it is to get the right compressor. A lot of car groups just have this "bigger is better" idea, and many of them have problems making power on their supposedly bigger turbo's.

Ignition timing is king.

[Brian Putman]

I would like to see all the data, or know exactly what caused the HP drop with higher boost on that DSM. I was running a 57 trim on my Daytona, and it did pretty darn good. There was a HUGE increase in power from 15 psi (that was my first stage boost level) to 26 psi which was my second stage boost level. And I was running the 26 psi on 93 octane with no problems. The turbo even made a very noticeable increase in HP on race gas @ 28 + psi. At that psi level the DR's would brake loose at around 50mph in 2nd gear with the auto trans just by stabbing the throttle. I will admit though I think the 50 trim is better.

[Ondonti]

Quote:

Originally Posted by Brian Putman I would like to see all the data, or know exactly what caused the HP drop with higher boost on that DSM. I was running a 57 trim on my Daytona, and it did pretty darn good. There was a HUGE increase in power from 15 psi (that was my first stage boost level) to 26 psi which was my second stage boost level. And I was running the 26 psi on 93 octane with no problems. The turbo even made a very noticeable increase in HP on race gas @ 28 + psi. At that psi level the DR's would brake loose at around 50mph in 2nd gear with the auto trans just by stabbing the throttle. I will admit though I think the 50 trim is better.

Ignition retard and Poor charge density. Thats all there is too it. The 4g63 will easily outflow anything your daytona could attempt so a 57 trim is a HORRID choice for a dsm. .

[Brian Putman]

Quote:

Originally Posted by Ondonti Ignition retard and Poor charge density. Thats all there is too it. The 4g63 will easily outflow anything your daytona could attempt so a 57 trim is a HORRID choice for a dsm. .

I don't doubt the DSM's 4V head flows more than an 8V head. But I sure wouldn't say anything, as I've got a 4V head for future use as well. Indy can cnc port the 2.0/2.4 heads to 320cfm! I never did dyno the combo in the Daytona, and I could be wrong, but based on weight, ET, mph, fuel flow etc., I was making 350 to 370HP to the wheels. That same basic combo with some more flow work, larger cam and a better turbo etc.,will be going into my GLHS. I should be able to break the 400WHP. And then I'll go 4V. We'll see.

[vinniem3]

Quote:

Originally Posted by Brian Putman I don't doubt the DSM's 4V head flows more than an 8V head.But I sure wouldn't say anything, as I've got a 4V head for future use as well.

I think you meant 16V head, 4V's per cylinder.....I've yet to see a motor with 1 VALVE per cylinder do the work of both exhaust and intake .....Just poking fun man, don't get soar....

[Brian Putman]

Quote:

Originally Posted by vinniem3 I think you meant 16V head, 4V's per cylinder.....I've yet to see a motor with 1 VALVE per cylinder do the work of both exhaust and intake .....Just poking fun man, don't get soar....

Yea, that's what I meant. What an idiot!

[turbovanman]

Very interesting, keep us updated.

[Phreakish]

Quote:

Originally Posted by Ondonti The big difference here is that the 50 trim can hold higher than 70% efficiency ratings where at the same boost leve, the 57 trim is 55%. if the computer is forced to retard ignition because of detonation with the hot air from the 57 trim, you will see a huge power loss.

that would make sense, as the 16v head woudl be pushing far more flow to get to the high pressures than an 8v would at even higher pressures, the higher the flow, the more energy required to get it through the motor (especially at pressure!) and the eff just falls off with the increased shaft speed and the pressure probably helps to screw the flow real good too at those flow levels...

I bet on a smaller motor, even at moderate boost, and lower horsepower it would work well - If I understand all this stuff I think I understand as well as I hope lmao.