MyE28.com

Ok here is my setup.. m30b34 mls, arps, 42lb injectors, intank walbro 255, comp 61mm turbo .58 ar, megasquirt ms2, tial wastegate with 10psi spring, manual boost controller, and a/a intercooler. I just got it tuned locally on 15psi. The numbers are 270whp and 312lb of torque on a mustang dyno. To me it seems low but figured I would ask. Tuner said my injectors are maxed out and suggested some 1000cc injectors before turning up the boost. Now I have seen that some people say the 42lb injectors are good til about 350whp. Any help is appreciated.. may have to dumb it down for me to understand but I will try. My plan is to push the motor to the edge maybe 20+ psi.

What manifold? TCD manifold makes a consistent 345/395 at 15psi on a Dynojet. No way the 42lbers are maxed out. If tubular manifold, power level is higher and the Mustang Dyno readings are way way low. 100lb injectors are a stupid suggestion and that makes me wonder about your tuner. 60lbers are more than enough.

The manifold is custom doesn't look nice but I guess it works I don't know who made it.The tuner is local and is more of an Asian tuner evos and subarus. I tried finding some other tuners as well but the few I talked to didn't want to mess with megasquirt and he said he would do it. Yeah I figured from my research that 60lb injectors would be plenty for what I plan. Now I'm wondering if I'm having issues with the motor as well since it probably has 200k or more on it.

Have you done a compression test?

Yeah last time I did one they were all right around 150

15psi is twice the air, so it "should" make twice the power. Depending on your elevation.

Shadow wrote:15psi is twice the air, so it "should" make twice the power.

Efficiency is always better so they do at least 2.25x

Do you have any pictures of the set-up?

Can you post a datalog of a dyno run that indicates the injectors are maxed out?

If engine is healthy and the injector duty cycle is indeed maxed out I would start looking at fuel supply. Are you confident fuel pressure was maintained during tuning?

I don't know if fuel pressure was monitored. I should just install a fuel pressure gauge so I can monitor it. I will try get ahold of the tuner to see if he can datalog a full pull. Or I may try it myself with my tablet