Anyone have ideas. Working with a tuner nad it seems anytime MBT goes over 12 the car loses power. 12 is kinda low for E85 isn't it. Any ideas why its so low.

 

What RPM and boost? Any other setup details may help out.

Generally, from my experience and reading others, E85 likes low timing around peak torque and can ramp up much more than pump gas towards redline.

 

HKS 272 289 combo.
7500 redline
E85
HKS GTII 7460
JMF Race intake manifold
Mona Lisa Exhaust manifold
Map 02 dump downpipe combo
ETS 4. Inch intercooler
Black Ops double pumper
1450 fic injectors -8 steel braided fuel line


I think that's mainly it

 

Have you tested the fuel or checked the health of your motor?

 

ok, so its your car that tcompusa mentioned in R/T Ernie's thread. If its 12 deg timing at high rpm, e.g. 7000-7500 rpm, then that does seem low. Your mods look good. What was the air temperature during the tuning?

 

Motor is in good health (just had the head pulled off, replaced 2 pistons). Temp has been about 60-70 outside. Its cool air though so when rolling more like 40-50.

And it is my car. He's not a fan of the turbo and i have to say at this point I'm not sure I am either....I kinda feel like there is something missing that's holding the car back but I can't figure out what.

The last good tuner I had I don't think he had a problem getting over 12. I just went back and looked at some of my old logs and it had NO problem getting over 12.

What the hell could be holding the car back?

 

How is MBT being verified on at the higher RPM ranges?

If it's with the virtual dyno tools, I wouldn't trust that. Especially at the higher RPM ranges where the coding in the current tools seems to have odd effects because of the averaging.

But, I agree with everyone else...if you're talking about 12* at 7500 RPM, then that's definitely low and should not be MBT.

 

Tuner is using VDR I believe.

 

I'm so out of my element here......LOL. I just want my car to run right dammit. I wish I understood this $#!t better.

 

No clue why the turbo isn't holding anymore boost (can't get over 32 PSI). I'm double checking the WGA

 

Add 2* and see if it FEELS like it picked up more power and do a few runs.

If your adding 1* and doing one run after it might not tell you if it picked up power. Whats your AFR at redline?

 

11.8 - 11.9

 

That's horrible advice and a good way to vent a block...

- Bryan

 

I diagree, thats why its called MBT. There is a margin of advance that while it won't gain tq won't be over advanced enough to cause any damaged in the short term of making a pull.

4* was extreme to say. I should have suggested maybe 2* but on e85 its extremely unlikely it would do so much as make less power.

 

Sure go ahead and disagree, I'm sure motor builders while appreciate it.

Do you have any idea the difference in cylinder pressure % at 1* over MBT to 1* under MBT?