Hey guys i had a question? on my 88 TII, my fuel setup is:

800cc Primaries
1600cc secondaries
Stock Fuel rails
Stock Fuel lines
Stock Fuel pressure regulator
Walboro 255lph fuel pump

what out of this setup, would i need to change so i can support 450whp reliably? i'm probably going to be pushing about 17 psi out of my masterpower T-70 to make this kind of power, but i want to make sure i am Squared away with my fuel setup.

 

change to...


stock fpr to a stand alone.

switch to a parallel fuel system setup.

your good to go.

 

well i'm running all this on a haltech E6k, by stand alone did you mean an aftermarket FPR?

 

The parallel fuel mod would be a good idea, as well as an adjustable FPR.

 

Try the bosche 044 fuel pump. Mount it in tank. I've seen 3 rotarys break into the 400's easily with it. And you will need an aftermarket FPR.

 

whats the flow of the bosch 044? versus the walbro 255lph? is it the same flow or is it greater?

 

No need for the Bosch, the whinebro will be fine.

 

^Rly? A single walboro will be good to 450rwhp?? If that's the case I may not need to fork out the $200 for the bosch unit for awhile longer.

 

I ran a single up to about 554 RWHP with a small shot of alcohol on top. Far as I am concerned the Walbro can support 450 as long as the supporting mods are there (FPR, etc..)

 

so i'd be pretty set with the stock fuel rails, an aftermarket fuel pressure regulator , walboro pump and the stock fuel lines?

 

yup

 

for me a reliable set up with growth for the future in the mind, just incase you want to surpass 450 in the future... wich everyone always does.

dual walbros (one pump per rail -6 lines or -8 single fuel line)
850 primary
1680 secondary
and adjustable regulator
E85

 

Out of curiosity, at what hp level does the fpr have to be upgraded? Under the conditions of walbro, stock rails, aftermarket injectors. I know this may be a retarded question because that's what a fuel pressure gauge is for to find out.

 

theres no set number on what HP level it should be upgraded. its just HIGHLY reccomended when using any major fuel upgrades...

 

with that setup would i have to get aftermarket fuel rails for the -6 and -8 lines?

 

yes, stock lines are very small. adding larger fuel lines is a part that i would not want to over look. especially when the stock fuel lines have been accumilating dirt and grime for 20 years...

 

i dont trust walbros.

they work fine but ive seen 3 pumps on 3 different cars go out for no reason. they're kinda hit or miss in my opinion.

I personally use this one:
http://www.rx7.com/store/rx7/fcfuel.html
kinda of an upgraded walbro. its a drop in replacement too.

Ive had it in 2 different FCs(same engine) with no problems. Its pretty reliable.

 

I disagree. -6 and standard 3/8 fuel line are identical as far as ID. the only real difference is the outer steel braiding. My car had an identical setup the OP was describing with -6 (stock sized) lines an i had no problem whatsoever. I only went to SS lines so i could connect everything with AN fittings to be sure i wouldnt have any leaks

however, the age factor is something to think about. not necessarily for dirt and grime but for old fuel turning into varnish and the hoses cracking and leaking.

 

for -6, no. its the same size as stock plumbing. it will slip right onto the stock fuel + hose clamp like the stock setup.

for -8, yes. or get a -8 to-6 barb fitting to make the -6 slip on the stock fuel rail.

or you could just get aftermarker fuel rails, use AN fittings and not worry about leaks. more expensive though.

 

the stock lines are not -6. go measure again.

Walbros are some of the most reliable pumps on the market. Its how they made there name The imitation walbros from eBay die out,but they are NOT walbros. dont confuse them.

 

Out of curiosity, why go with that RP fuel pump as opposed to a Denso Supra pump? For the money you're shelling out, anyway.

 

Bosch 044 is about as reliable as reliable gets.

 

^+1 but not neccessary IMO unless your keeping further upgrades past like 525whp or more in your mind. then again, if your goins as far as 450 you then there really isnt anything stopping you from buying a 044

 

Im no kid buddy. i have ran over 11 different Walbro fuel pumps, inline, and intank on my personal cars alone. Not counting all the ones i installed for people. Never a problem. Maybe its you...

 

Isn't it strange how people complain about how easy our motors are to blow when boosted then try to save $100 on a fuel pump?