Looking for a Nissan factory FPR for a boosted engine. Will the 300Z TT FPR fit on a 91 Q45?

you dont want it like that.... Stock FPR is fine... no vaccum=max pressure...

I see you have a plan of sorts!

No vacuum = 43.4 psi, however air pressure on Q FPR will increase fuel pressure in rail up to flow limits of FP.

If 18/29.92" HG is consider a vacuum and yields 34 psi vs 28/29.92 = 43.4

8.8 psi [vacuum] controlls 10 psi change you could say the Q FPR is a 1:1 unit; roughly so 8 psi positive boost should increase fuel pressure by 7-8 psi which would be 7.7% extra fuel flow thru injector vs no boost.

One should field test before relying totally on these numbers!

51 psi fuel pressure is well within the oem pump [and injector] capacity

Q45tech - I think I understand...maybe.

So if I keep to 8 lbs of boost the factory FPR will be fine?

WES - Yes, a plan. I took your advice and just decided to go for it instead of trying to plan everything in advance down to the last bolt.

dsagers wrote:Q45tech - I think I understand...maybe.

So if I keep to 8 lbs of boost the factory FPR will be fine?

WES - Yes, a plan. I took your advice and just decided to go for it instead of trying to plan everything in advance down to the last bolt.

Yes... obviously you will want to hav esomething change the timing and add fuel but the FPR will provide all the go-go juice youll need.

8psi ...........14.7 +8/14.7= 1.544 times NA air flow so you need 54% more fuel .........................7% more fuel from raising FP 8 psi [43.4 > 52 psi] won't do it.

Going to 60 psi won't do it =18% more fuel you will need reprogramming of ecu to increase injector time.

and of course, you dont want to raise the fuel pressure across the board, and rising rate fuel pressure regulators are "cheap" ways.. yeah they work, but its just kinda like cheating... Its not supposed to be easy!!!

Q45tech wrote:8psi ...........14.7 +8/14.7= 1.544 times NA air flow so you need 54% more fuel .........................7% more fuel from raising FP 8 psi [43.4 > 52 psi] won't do it.

Going to 60 psi won't do it =18% more fuel you will need reprogramming of ecu to increase injector time.

Right you are. That's were Bob Bowen's tuning skills will be needed!

does your said plan involve a one M112 or something else?

Hey Wes, thanks for asking.

It should, I have three of the M90s in my garage, one is really nice with lots of porting, etc...

However, a couple of months ago I asked about the ideal turbo for the 4.5 engine, and one of the really knowledgeable members suggested a turbo unit that was a perfect match for the engine. Problem is that turbo is big $$$$.

I am working on a rear mount twin turbo set up. It also helps that I live within 30 minutes of STS turbo systems, and their local guy is very helpful.

Recently located a Nissan racing turbo for a 2.0 - 2.5 engine. Dual ceramic ball bearings and ceramic impellers. Oil and water cooled. They are suppose to make boost at very little flow thru the turbine. These things spin so easy, its like they are not even riding on a bearing surface.

I found a brand new one for $250 and a slightly used one for a few $$ less. So I have two small turbos that will spin up really fast, and flow enough for a 4.5 engine, maybe not all the way to 8,000 RPM, but it'll sure be a powerful surge getting to what ever RPM they top out at.

I also purchased a belt driven dual stage dry sump pump. One section for the turbos and the other section to keep vacuum in the crankcase. I won't get 20 inches of vacuum like the NASCAR car boys, but I'm sure there will be negative pressure in the crankcase.

Initially, I will set up both turbos to run in parallel. However if the boost doesn't come on soon enough and strong enough, I will use an electric exhaust cut out valve to run all the exhaust thru just one turbo until it hits some 4 lbs of boost, then the exhaust valve will open and and both turbos should be well on their way to to providing a really fun ride.

You are probably wondering the reason I didn't go with the M90. Fact is I couldn't figure out how to bolt on a SC to our intake manifold without spending a fortune on fabricating a new intake system. Then there is the question of hood clearance. Maybe a 91 Q would look good with a hood scoop, but I can't find anything that I really like?
Modified by dsagers at 7:19 PM 12/13/2006

Good stuff... I really hope you dont plan on putting the turbos all the way in the back. IMO you could put them where the stock catalytic converters and then run them back up to the engine compartment....

Hopefully you dont have emissions.

Would love to put the turbos in place of the pre-cats, I even measured and they will fit.

Problem is getting the fresh air plumbimg to them and then another pipe taking the compressed intake air to the throttle body.

Any ideas?

I think you have something going on, i think you ought to post in the VH forum... you know I'll be there!!!

alright now we're in business, do you wnat me to change the title to anything specific????