Lionheart240

the FPR came with the car. Should I just disconenct it? What will that do to the REST of the car? Is it even possible? That might even explain my horrible idling, and hard time starting the car since it's not getting fuel, you think?

Ranzo

Maybe its getting too much fuel........ What is the pressure set at the the FPR?



It could be that your motor is old and worn out so there is not enough compression there to make decent boost. This would make it hard to start as well and if you have the fuel pressure cranked up it would all complicate.



I dunno but it still sounds like you need a boost controller but before you do anything else go buy some guages so you will know what is going on.

Lionheart240

The core has about 40k original miles on it, everything else is from the old blown S4 motor, but I cleaned the throttle body by hand, myself, before I put it back in the car, and everything else was cleaned, and every gasket/seal was replaced EXCEPT for the injector seals, which didn't look like they needed to be replaced anyways. :/

Lionheart240

We made a boost controller and we got it to run 12psi.



How much boost can I run safely with my setup on this turbo?



12psi was f*cking FAST!!! We're talking like a 13 flat 1/4 or HIGH 12. I was keeping RIGHT up with my brother in his monster 240.



But again, how much can I run S A F E L Y with my setup? I don't want to have it be fast but blow on me in a month. I need it to last at least 6 months so I can mod it a little and THEN sell it! lol...Seriously though!

Ranzo

With a normal computer and normal injectors I would say you are at the limits with 12 psi. NOrmally with a ROM tune and normal injectors in Japan we see 270hp at the wheels with a high flow. Larger injectors and good intercooler boosting 14.5 psi you can see 320 at the wheels.





Get some 720's for the secondaries and you will be straight for a while.

Lionheart240

Yeah, but how much boost can you run on the stock seals?

Ranzo

More than that turbo will boost......



Boost is a relative term...... people should think in terms of CFM instead of boost. Most hi flo turbines wont make much power above 14-15psi........sounds alot like the stock turbine dosen't it?! However that larger more effecient compressor makes more power at the same boost levels........HMMMMMM Basically the turbine can only spin so fast before it gets out of its effcieancy range this comes down to about 450CFM on most hi flo turbines. If you turn up the boost the compressor chops the air more......heating it up and reduces the power potential.



You might see some small gains just from the rise in pressure but unless you have a serious intercooler and you ignition timing is set up for those super high intake air temps the engine will eventually die.



If I could have a turbine that 500hp at 10psi of boost then I would use it, unless it took it a day and a half to get to 10psi.

Lionheart240

Well unfortunately, cooling is an issue considering my boost, because I'm running a stock intercooler and radiator. I don't drive it hard often though, so it's all good. On the highway though, I have no 4th gear, so cruising at like 4,000+ and THEN flooring it = bad, I've noticed.



If I had a front-mount intercooler and Koyo radiator, how much boost can I run though? Right now I'm using kind of a home-made boost controller and the most I can get out of it is about 12psi.



What is CFM and how is it measured?



My friend was running 14psi on his stock seals basically with a T3/T4 turbo and the other necessary fuel upgrades, but he had no cats and eventually blew a seal. I have a high-flow cat... O.o



Ugh! I'll never get a straight answer!

j9fd3s

30+ if you have enough fuel and you can keep the intake temps cool enough for it not to detonate.



on a stock ecu and injectors 10-12 psi is about your limit.

RETed

You'll never get a straight answer cause you don't know how to describe what you're doing and trying to do.



Seriously, I dunno who you've been listening to, but stop listening to them!



We're trying to help you, but you're talking apples and we're talking oranges.



Bottom line, if you're stock ECU with stock fuel injectors, don't go over 12psi (stock turbo?).



If you really got a compressor upgrade, don't go past 10psi.



Why? Cause you're maxing out the fuel injector capacity with the stock ECU. I've seen my stock 4x550's hit 95% on my stock ECU at 14psi. I was running a very tiny compressor upgrade, and this set-up made 253 to the wheels on a DynoJet.



Stop ******* around and keep the boost down. If you need to keep it alive for a few months, why you trying to blow it up???





-Ted