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The stock 1uz will handle 10 psi without much problem, I cracked a ring land at 12 psi but the engine had voer 200K miles on it at the time. I wouldnt think twice about 6-8 psi. I am not sure that this will get you 400whp though. It didnt for me. Based upon my experience you will need to be at...

Sounds like fuel to me as well, I still dont see how fuel pressure can go above the factory intank regulators setting. I would hook up a fuel pressure guage and check to make sure that the psi is not dropping. That would at least rule it out or confirm the issues.

Are you positive there is a return line. I am pretty sure that the Lexus all have intank regulators and no return lines in stock form. At least the GS IS and LS do. I am pretty sure that the SC is the same way.

So you have the factory psi regulator still in the tank? Is it still regulating fuel pressure? If it is still part of the fuel system, how does your rising rate PSI regulator ever get a chance to allow PSI to rise above the setting of the stock regulator which is supplying it? Not sure if I...

I would guess that the jerking is caused by the car leaning out and not having enough fuel to burn. Fix the lean condition and I bet the jerking goes away.

I have a built A340 available to me, it comes out of the turbocharged supra and I am considering using that as a solution to my need for a high HP tranny. Of course this transmission has been built for manual shift only but I guess I could get used to that. I am told that the bolt patterns...

at the risk of exposing my lack of knowledge on the tranny side of the house. I was under the impression that the R154 would only hold up to around 400-450 hp am I incorrect and it will go higher. I ask because I am at a point where I cannot really crank up the HP (even though it is available)...

no they dont hit at all not even over speed bumps

I have oftent thought about having a replacement bar made, but I havent for a couple of reasons. 1. it is beyond my personal abillity, 2. I havent really noticed and loss of handling. I would love to do it some time but it really isnt that high of a priority for me I guess. I havent had any...

you guys are very optimistic. injectors are 800 plus lets say a SAFC for 300 plus 150 for install plus wastegate plus bov maybe plus, intercooler, etc etc. Maybe everythying issnt required but the stuff that is seems like it is over 1K easily Install is gonna be serious plus any...

disregard, I just realized that this was a vendor thread, I wouldnt want to post another vendors informaiton in it. Please accept my apologies.

Yes, I am. (extra characters to make system happy)

Short answer is "probably not"

You may be able to get away with out one but the problem I had was that smaller injectors were fine under no boost or low boost, (about 12psi or less) but when I was under high rpm and high boost I would run lean and could not dial in anymore fuel. I could have gone to larger injectors and that...

No they cant take 12psi, I changed out my stock injectors way before that. When I said upgrade the fuel system I meant the fuel pump and fpr.

Yes I would reccomend the SAFC only because no one to my knowledge has successfully installed and emanage on a 1uz let alone a late model 1uz with VVTI. I have learned not to be the guinea pig I have been running my safc from 6psi (spring) to 17 psi daily. The FPR is a requirement when you go...

The SAFC is does adjust fuel based upon rpm, but it is not boost sensitive. It is far from ideal, but it works. for instance, I can be at 4K rpm and be into the boost or I can be at 4k and not be boosting. The way I adjus it is that I assume that most of the time if I am at 4k for instance I...

The factory bar is very light and thin material, it isnt going to do much in terms of holding the wheels apart. I would have prefered to keep it or even put a TRD unit in but well it didnt work out. I have had no problem with the SAFC. My understanding is that The problem you outlined has to...

I bought all the fittings for my fuel system at www.summitracing.com www.Jegs.com

Well in theory it makes the car less rigid when cornering. I dont know if I have ever noticed a difference though. The bar isnt that thick to start with. I havent heard of many guys in the US using the SMT make sure you look into it.