1UZ mods with factory ECU

[DVSMOTORSPORT]

Hey guys, I'm putting a lexus v8 into my ute as a show vehicle that will eventually become a daily driver.

Basically I want to keep the factory ecu and auto, but, add on either a couple of turbo's on low boost, or maybe idependant throttle body's.

So the question is really, how much can I get away with on the factory ecu.

Turbo's are really the way I want to go, so they need to look good but also work, so how much boost can I run on the factory ecu?

Is there any other mods you guys can think of as well?

Cheers
Ben

 

[Cobber]

Ok for low boost but if your spending the money go aftermarket ecu, much more potential. Factory ecu is no good for multi throttle bodies.

 

[DVSMOTORSPORT]

Cool, cheers mate, yeh I might spend the money later on down the track but at the moment its just for the show scene, and when it becomes a daily driver it doesn't need to be a power house untill I get bored of the power.

Does anyone know how much boost I could run with the factory ecu? max 7psi sort of thing or even lower?

Yeh I thought more about the throttle bodys after I posted and came to that conclusion, I might be able to hook it up ok but would still need an airbox over top to run the air flow meter.

Cheers
Ben

 

[kc95sc400]

Does anyone know how much boost I could run with the factory ecu? max 7psi sort of thing or even lower?

I am running about 12 psi on the stock ECU in my 95 SC400, using a MaftPro ONLY for fuel tuning.

Been daily driving it for over 2 years now.

200+ track runs. The only thing I've managed to blow so far is the transmission.

KC

 

[DVSMOTORSPORT]

Oh ok, cheers mate. I havn't heard of Maftpro before tho, is a piggy back ecu or something. Would a rising rate fuel pressure regulator work as well?

Cheers
Ben

 

[stevechumo]

I used to run 9 psi with stock ECU, no piggy-back ECU whatsoever, rising rate fuel pressure regulator 12:1 FMU, and a HP-HF 255 fuel pump with no problem. I blew the motor at 11 psi with this setup.

 

[DVSMOTORSPORT]

Oh sweet, that sounds like the info I'm after, I'm sure 9psi in a show truck will be plenty of power, well, for now any way

 

[kc95sc400]

Steve, didn't you just blow the head gasket? Or, did you actually break something?

Yes, the MaftPro is a piggyback. It's a translator that allows one to eliminate the MAF sensor and use a MAP sensor instead. Works pretty good.

In all fairness, I think I've been very lucky with my car. Not sure what it is, but it seems that something about my setup works well AND keeps it safe.

I have been considering an FMU, I think I'm pushing the limits of the Walbro pump / 315 injector combo but I have no plans on getting an aftermarket ECU to control timing.

Hoping to break into the 11's (and nothing else) next time out on the 1/4 mile!

KC

 

[stevechumo]

Steve, didn't you just blow the head gasket? Or, did you actually break something?..

You're correct. I blew the head gasket and bent 1 rod at 11 psi. I knew that would happen, because most of the guys running the same setup as mine only recommending it at lower than 9 psi.