Hi I was looking at a freinds supra with a Lexus and 550 set up with a 60-1 bolt on turbo and the car is hitt fuel cut between 14-15 psi . I was thinking that was a bit low but I have never run that set up, Also the car is running a stock IC and piping and it seems to me that the setup would have a lot of pressure drop at that volume of air. Does The fuel cut sound like its in the right place to everyone else, And could the Intercooler effect that?
Fuel cut ?'s for 550s with Lex
- Thread starter blk91
- Start date
Fuel cut is based on the amount of air past the AFM. Doesn't matter on PSI...
Larger turbo will flow more air at a lower PSI.
Stock intercooler is one of the best intercooler put on a stock car (though I think some of the ones on modern cars trump it), so it's not that big of a restriction. The piping isn't bad, but it tends to leak and as most of the pipes are soft, they will balloon a bit.
Larger turbo will flow more air at a lower PSI.
Stock intercooler is one of the best intercooler put on a stock car (though I think some of the ones on modern cars trump it), so it's not that big of a restriction. The piping isn't bad, but it tends to leak and as most of the pipes are soft, they will balloon a bit.
^^^What he said.
Thats about the right level. You wont be able to run any higher boost until you start tuning the car with some sort of fuel computer and adjusting fuel pressure with a regulator. Add a Walbro, S-AFC (or something similar) and a AFPR and you can crank up the boost.
Thats about the right level. You wont be able to run any higher boost until you start tuning the car with some sort of fuel computer and adjusting fuel pressure with a regulator. Add a Walbro, S-AFC (or something similar) and a AFPR and you can crank up the boost.
ihiryu;1168149 said:
That FP is way too high :aigo:
I have mine set at 27 psi (vac on).
Like Grim said, check for boost leaks.
Why in the world do you have your fuel pressure set at 60!?!?!?
It's already been said. The car needs to be tuned! You don't have the necessary mods to SAFELY run more boost. Sure there's a little play room; but, only a LITTLE!
Save up some money and get the rest of the recipe for more power. :icon_bigg
It's already been said. The car needs to be tuned! You don't have the necessary mods to SAFELY run more boost. Sure there's a little play room; but, only a LITTLE!
Save up some money and get the rest of the recipe for more power. :icon_bigg
I'm pretty sure I don't have boost leaks, I did all my IC piping in metal and it's all welded up with exception of three couplers. I think I do have the supporting mods, LEX AFM, RC550's, SAFC, 2mm hg, afpr and arp headstuds. And I have a 2jzget. I don't think it's really at 60, I think the gauge is fubar'ed. My new one should be coming in soon.
The reason why it's at sixty is cause it doesn't like to idle anywhere else. I'll put it down to 45 and the idle will drop to a low 650-700 when the car is first started.
The reason why it's at sixty is cause it doesn't like to idle anywhere else. I'll put it down to 45 and the idle will drop to a low 650-700 when the car is first started.
Ah... Now he posts his mods list! ;D
Yeah, get that gauge replaced so you'll know where your fp is at.
As stated above I'd check for boost leaks. You could have a pin hole or two in the IC or pipe. There's a DIY sticky somewhere that shows how to build a boost leak tester for like 8 bucks with parts available at any Home Depot.
Yeah, get that gauge replaced so you'll know where your fp is at.
As stated above I'd check for boost leaks. You could have a pin hole or two in the IC or pipe. There's a DIY sticky somewhere that shows how to build a boost leak tester for like 8 bucks with parts available at any Home Depot.
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whats wrong with a 650-700RPM idle? my car idles at that, and it makes it nice and quiet when im just sitting at a stop light...
do you have a wideband? cause i see you have all the other stuff..
do you have a wideband? cause i see you have all the other stuff..
60psi base + 10psi boost= roughly 79psi fuel pressure, WAY outside the stock pumps abilities.
good pump comparison
good pump comparison
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the fact that you stated your going off of busted (or unreliable) gauges would signify postponing most head scratching until you have reliable data.
there's a few holes here that I think need to be filled in to get a real answer. You say you have a 2jz and yet in this thread -> http://www.supramania.com/forums/showthread.php?t=82828
you say you have a 7M. fp set at 60? you had some breaking up at 3k-5k rpms, has that been resolved? Where in ca are you located as having someone who is a bit more familiar with the MK3 might be able to help with some hands on diagnostics....
you say you have a 7M. fp set at 60? you had some breaking up at 3k-5k rpms, has that been resolved? Where in ca are you located as having someone who is a bit more familiar with the MK3 might be able to help with some hands on diagnostics....
just for the sake of tuning. I mean why not right? I've done it on my other cars, just haven't done it to this one. I've only had the car for a few months, and I'm really trying to work all the kinks out of her. I love the car, it's just upsetting me with all these lil problems i'm having /end rant.
Sorry i had to say that
Sorry i had to say that