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is a VR4 pump OK for 50-75hp shot w/ an 18g?

Kookykrispy

Proven Member
76
1
Jul 6, 2004
Albuquerque, New_Mexico
I am upgrading several systems on my car...

I have an 18g turbo I'm in the process of installing with an fmic

660 injectors when I get my logger and safc

and I have a single fogger wet kit not installed yet, but I want to soon. I plan to jet it at 50hp, possibly 75 later.


My question is...

Will a VR4 fuel pump (with the rewire mod done) be enough to support a 18g w/ 660 injectors at about 17-18psi and a 50 shot?... how about a 75 shot? How about 19-20psi plus the nitrous?

I'd rather not get a 255 fuel pump and aftermarket regulator if I don't absolutely have to.
 

mavisky

DSM Wiseman
5,382
23
Sep 13, 2002
Atlanta, Georgia
I'm still on my vr4 pump (rewired with base fuel pressure set to stock) and a set of 650's. I did just fine last year with only 510's at 20psi, but this year I'll be taking it up into the mid 20's on pump/race mix. I'm guessing that at about 25-26 psi I'm going to start running out of pump, but we'll have to wait and see. Personally though I'd reccomend getting the 255 especially if you already have an afpr for the car.
 

tstkl

15+ Year Contributor
3,874
62
Feb 10, 2005
SoCal, California
steath 316 says it flows about 174 lph, so it wouldnt outflow a 190

http://stealth316.com/2-fuelpumptests.htm

im not gonna say anything about the NAWZZZ though, because it would all be about as helpful as this sentence.

edit: one thing i can say though, is get a wideband o2 sensor, and find out, if you start turning lean you can let off and turn off the nos, and experiment with that. also watch knock, and get a fuel pressure gauge in your car, although your either going to have fuel running into your cockpit (mechanical gauge) or your going to have a less accurate electical gauge, so i think watching the a/f on a wideband would be better/easier. it will also tell you other things about your tune.
 

doug

Proven Member
3,122
16
Mar 9, 2002
SoFla
tstkl said:
steath 316 says it flows about 174 lph, so it wouldnt outflow a 190
I dunno-- RRE says that the VR4 pump at 12 volts flows 180lph @ 43 PSI @ 12V, while the 190 flows 168.45 lph @ 43 PSI @ 12.5 V. I guess this is a case of choose who you want to believe, although stealth316's real world test data seems pretty convincing. Anyway, if you want to be the king, just get a Supra pump-- 258lph at 12.5V and 296.5 lph at 14! AFPR definitely required...

http://www.roadraceengineering.com/fuelpumpflowrates.htm

http://www.roadraceengineering.com/fuelpumptechtip.htm
 

tstkl

15+ Year Contributor
3,874
62
Feb 10, 2005
SoCal, California
doug said:
I dunno-- RRE says that the VR4 pump at 12 volts flows 180lph @ 43 PSI @ 12V, while the 190 flows 168.45 lph @ 43 PSI @ 12.5 V. I guess this is a case of choose who you want to believe, although stealth316's real world test data seems pretty convincing. Anyway, if you want to be the king, just get a Supra pump-- 258lph at 12.5V and 296.5 lph at 14! AFPR definitely required...

http://www.roadraceengineering.com/fuelpumpflowrates.htm

http://www.roadraceengineering.com/fuelpumptechtip.htm
or an aeromotive a1000 like im going to, in line pump all the way. this way later you can just slap another one in line with the first if you start losing pressure.

but for some reason i believe thats a little off topic as he is asking about the vr4 pump, cuz then you could also suggest the evo8 fuel pump, with rewire mod, it will require an fpr though
 
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