Getting 650 injectors now which fuel pump for my goals?

[4gfun]

So you all have helped me choose 650 cc injectors for my goal.

For those of you who haven't seen my other thread, my goal is to run 20-25 psi on 93/94 octane on my Big 16g Turbo.

I don't plan on getting a bigger turbo ever and if I do then I will eat my words.

I have the Ostrich on the EEPROM ECU for management.

Any thoughts on getting a 190 lph pump or a 255 lph pump?

I have done some searching but the levels of boost that I will be running will be different than others.

Thanks again!

 

[4gfun]

Actually, for your goals I would have recommended 750cc injectors, unless you plan to jack up the base fuel pressure to the 2G/EVO 43psi. The 650cc injectors can flow as little as 635cc, and at the stock GVR-4 base fuel pressure that is only 585cc, not enough for 25psi IMHO.
As far as what fuelpump, I like to point people to the fuelpump tests that Jeff Lucius and RRE have done:
Stealth 316 - Fuel Pump Upgrade Guide
RRE Instructions
AMS has some good tests too that you should look at.
At 100% duty cycle, 650cc injectors @ 37psi base fuel pressure will need ~143 liters/hour of fuel. That corresponds almost exactly with what a non-rewired Walbro 190 pump can do at 58psi, which is 37psi base pressure + 21 psi boost. The problem is that at anything higher than 58psi you will have <145 liters/hour of fuel volume, so your injectors can outflow the pump. To be safe you should rewire it.
If it was me, I'd run the 255HP pump with an AFPR and 750cc injectors, and call it a day. Actually, I ran a Denso Supra pump, AFPR, and 750cc injectors on GVR-4 #1886/2000.

Is the stock GVR4 fuel pressure any lower than the 1g?

 

[SBR Joe]

I missed the Evo 8-9 pump posts by the way. The thing is, I believe that the 2g pumps are direct bolt ons to the GVR4 and that the 1g pump won't work.

I wonder if the Evo 8-9 pump would be a hassle.

Ive seen most 91 model GVR4s use the 1g style sending units. Some 92's ive seen like a 2g.

 

[jeffo]

Stock base fuel pressure for GVR-4's is the same 37psi as the 1G manual DSM's.
The OP was also right, a 2G fuelpump fits the GVR-4 better than a 1G kit.

 

[4gfun]

Stock base fuel pressure for GVR-4's is the same 37psi as the 1G manual DSM's.
The OP was also right, a 2G fuelpump fits the GVR-4 better than a 1G kit.

Good to know. Is the 2G fuelpump kit a direct bolt in?