190 LPH pump. need FPR upgrade?

[SHO_DOODmorrris]

Hey guys,
Got a 190 LPH out of a junkyard SHO and im going to put it in my car soon as im getting Nitrious. i searched and couldent find my answer or found conflictiing results. its a walbro 190 lph pump. can my stock fpr handle this? i really dont want to shell out 230 for an upgraded fpr if possible. is there a way around this like a resistor? thanks

-mitch

 

[SASHO91]

You can run it, however, I have found that it's a good idea to reset the EEC every oil change or so.

I have not had any other problems with mine.

 

[hawkeye18]

AFAIK a 190lb/hr unit will require an upgraded FPR. I suppose you'd be able to run a resistor in-line to drop the voltage, but in order to do it right, you'd have to have the total resistance of the pump, and figure out how to drop it to down about 150-160lb/hr.

Sorry d00d... I think it'd be easier/cheaper/more reliable to just get a 155lb/hr unit from rockauto or shosource or RCM, etc etc etc....

 

[SHO_DOODmorrris]

Do you agree on a resistor to limit the pump?

 

[SASHO91]

I'd try and find a reostat (sp?). That way you can adjust it just like the SS kits had. I can't recall of hand who makes them, but that would be a better solution. IMO anyways.

 

[SHO_DOODmorrris]

I'd try and find a reostat (sp?). That way you can adjust it just like the SS kits had. I can't recall of hand who makes them, but that would be a better solution. IMO anyways.

Yes a rheostat would be also a good idea. i will look into it further later but for now i guess i will just reset the eec every other week or so just as a precaution. thanks sasho

-M

 

[BlackonBlack89]

Ur is an 89 right??

U can get away with it and be fine becasue the 89-90 drop voltage at idle. Which is good b/c then the stock fpr is not going to be so overloaded by the extra fuel. But 190 for N20 is overkill but u got so why not.

 

[SHO_DOODmorrris]

quick Q though... is the white resistor on the firewall what controles that? cause i did a 91 dash swap and chucked the thing

 

[firstgen89sho]

In the 89, I was running that pump with no FPR, now I cannot remember what all wiring harnesses that you swapped over from that 91

 

[SHO_DOODmorrris]

well... everything in the engine compartment really.

 

[Lupo]

Put in the 190lph pump, and check the fuel pressure at idle. If it's over 31-32 (figuring about 16inches vac at idle), then you need to reduce pressure.

 

[Toolman]

quick Q though... is the white resistor on the firewall what controles that? cause i did a 91 dash swap and chucked the thing

yep. I would get it back. Then you will be fine. I have a 190 in the turbo, and it had no FPR for some time. I got away with it because of the resistor.

 

[SHO_DOODmorrris]

yeah but another q... i have the harness from teh 91 therefore i dont have the plug for the damn resistor XD

 

[Lupo]

I built a 2 speed system for my 94 a little while back. I was inspired by a thread started by Josh (SHONut) about the FPR overpressure problem. With some of his suggestions, I made a 2 speed system that worked fine.
However, I later decided it was simpler to get the right FPR in the first place, vs band-aid the problem.

The first relay turns on the fuel pump (activated by the IRCM) through a direct connection to the battery. I did this at Josh's suggestion so the fuel pump amperage was not going through the IRCM, especially when the boost-a-pump kicks in. This gives nice clean voltage to the fuel pump.
The second relay routes the fuel pump power through a resistor (that thing in the middle), at low speed, and bypasses the resistor at high speed.
This relay is activated by a mechanical vac switch. It can just as easily be activated by anything else, like an RPM switch or something.
I attached an old computer CPU heatsink on the other side of the resistor, to dissipate the heat.

 

[SHO_DOODmorrris]

nice... i have a few relays kickiong around too but yeah i should prob just find out a way to wire that resistor in...

 

[amclea01]

Just curious, what problems may arise from using a 190/lph fuel pump without changing the fpr, or regulating the flow in some manner? I had a 190 on hand and used it about 3 weeks ago to replace my failing stock pump. I plan on replacing it in the spring with the proper one. So far I have not had any problems and I drive about 50+ miles per day, but am curious if there are any issues I should be expecting. (94 MTX)