Fuel setup

[boostmaniac]

Can I run my 750 inj. with just the maft? I want to install my holset 35/40 on my stock block with just the maft,750cc,afr,dejon intake,fmic,255 walbro for about two weeks.

 

[Quasimondo]

Yes.

http://www.fullthrottletech.com/showthread.php?t=105

 

[blcknspo0ln]

The answer to your question is yes, you can, but would you want to? no. My rationale is quite simple. The SAFC or MAFT (or any piggy back unit) can only go so far concerning tuning. 750 inj. are entirely to large to compensate for on a piggy back unit. The largest I would go is 660's (which I currently have) are my HI settings are hovering in the mid -30's. More rationale would be that the more correction you provide with a afc/maft the more aggressive your timing curve becomes. if you're adamant about using your existing MAFT to tune, at the very least get a chipped ECU that sets your base injector settings to 750's. This way you need only to fine tune. Goodluck with whatever you do.

 

[daren_p]

Well if its only for 2 weeks then it probably wont hurt anything, just try not to "get on it" too much until you have a proper fuel setup for that large of injector (eprom chip, dsmlink etc)

 

[boostmaniac]

I already have dsmlink, This is for the time being when I send my eprom ecu into them to socket,chip it.

 

[daren_p]

Well then you should be fine, get the injector comp close with the maft and just try not to do any wot pulls. If you have to, just keep an eye on the knock, if you have a logger.

 

[oldman]

You'll also need an afpr.

 

[CrazyGSX]

what is a afpr?

 

[JDNSBR]

what is a afpr?

Fuel pressure regulator. This is needed with a 255. The 255 overruns the stock FPR.

 

[blcknspo0ln]

adjustable fuel pressure regulator . if you're a 2g set it to 43psi

 

[JDNSBR]

adjustable fuel pressure regulator . if you're a 2g set it to 43psi

Yes adjustable.

 

[oldman]

adjustable fuel pressure regulator . if you're a 2g set it to 43psi

43.5 psi.

 

[daren_p]

43.5 psi.

with the vac line disconnected

Not that that .5 psi would really matter as most of the crappy automotive pressure gauges are about +/- 5psi accuracy