GTX ECU and compression ratio

[therieldeal]

in all honesty its not really worth revving past that anyway, the efficiency of the vj20 drops off so much

[smoke187]

off topic damn you 2 post allot ryan 9000+ jon 5000+ lol

[Lex]

VJ20's outta puff by 5500 RPM. It's really dramatic too.

[smoke187]

i know i want a bigger turbo

[yiorgos]

if the revlimiter is above 7000 you have the BP26, the BP58 and BP55 revlimit at 6500.

My BP55 revs till 7200RPM with no mods.

[swalltr207jg]

the benefit of the higher rev really comes into affect when your using a bigger turbo, its quite noticable with the bigger turbo and bp26 ecu which I was using before, however I imagine It'll be even more noticeable when I get everything hooked up with my standalone.

[13thghost]

well i have a gtx engine for sale! well a complete swap for $1,300 or so.its in awsome condition.

[cat34evr]

So, what is the highest compression ratio that you can safely go to with the stock BP ecu (as found on a '91 Protege LX)? I don't want to go crazy high. Is 10:1 safe?

Am I going to end up like this guy? --->

http://www.flyinmiata.com/projects/current_projects_flip.php?x=594

[FE3-323]

its not a good idea to blame the compression ratio for that damage.
chances are too poor of conditions & high EGT's as a lack of tuning.
Matt fulgham is running 12+ compression so i think you'll be safe

[cat34evr]

its not a good idea to blame the compression ratio for that damage.
chances are too poor of conditions & high EGT's as a lack of tuning.
Matt fulgham is running 12+ compression so i think you'll be safe

Isn't he the guy that sells Megasquirt kits, though? I would assume he is running MS to go that high. Megasquirt at this point is out of my budget. Is 10:1 too high for the stock ECU?

Yes, there are so many factors that could have led to that damage.

[inferno94]

I personally run 9:1 non-forged miata pistons with a slightly shaved head (to straighten it) with zero issues. I have bp26 injectors and ecu and a probe fmic with a turbo rx7 afm. Only issues I've ever had was with lower octane (91) and boosting very near 15 psi.

I need/want a bigger turbo as the vj20 is a dinky little turbo like everyone says and it dramaticly drops off far before red line, instantaneous spoolup (2500rpm) is annoying too.

[FE3-323]

3 grand spoolup is nice put a VF8/10/12 in there