I have just swapped a S4 13bt with S5 turbo into my corolla, I bought a fuel cell and a inline walbro pump from someone on another board they claimed it was a 255lph, but when I got it I looked up the part number it was "GSL393" which appears to be about 160LPH.

My question is what is the stock fuel pump specs for a turbo fc(I thought there was a write up somewhere but I coudlnt find it) I doubt this 160lph pump will be sufficient for what I need. Should I try to get my money back/sell it to buy a 255LPH

I'll be running a s4 13bt w/s5 turbo, FMIC, 3 inch exhaust with no cat. cone filter all emmisions/rat nest etc removed

 

255 LPH sounds rather excessive to me. What injectors do you have?

 

as far as i know there all stock, I wanted too upgrade later on when I can afford a safc wideband etc. but for this season they'll probably stay stock

 

Then I say stick the 160 in and see how it goes. A 255 with stock injectors is too much. As a disclaimer, I have no experience with the 13BT motors, only the NA. However, from my knowledge of fuel systems in general, I'd say it is too big.

Other members, feel free to offer a rebuttal if you disagree.

 

I've read on here some were that a stock turbo fuel pump is the 60-70 range, and up to ~85 after a fuel pump rewire, and the stock 3rd gen pump is up to about 140?. so at 160 you should be set for up to 350hp? waymore then you'll need for a stock turbo.

 

70lph? I think thats what the stock pump in a corolla gts is around


I found it, the reason I figured it wasnt large enough is from this link it is telling me that the stock turbo fc3s pump pumps about 2.2lpm-3.3lpm (132lph-198lph)??

http://fc3spro.com/TECH/MODS/FUEL/fpump.htm

 

Another question for you mot_bot, are you still running the stock pressure regulator? Also, do you plan on using a standalone or are you still using the stock ecu?

 

yea everything is all stock for now except what I listed, so yea stock ecu stock FPR

 

Then 160 may be too much. I was assuming you where going to be running a standalone.

I say try it out...if it turns out to be too much you can always switch back to stock. Typically, full exhaust upgrade won't require a larger fuel pump, but rather some way to avoid stock ECU fuel cut.

Have you purchased an FCD?

 

too much? according to the chart In the link I posted it says stock pump flow ratings are around 132-198lph


have yet to buya fcd

 

160lph = 2.6lpm = 41.12gph

stock FD fuel pump at 40psi is about 53gph = 200lph

Should do fine... Any Pics of said rotary corolla?

 

build thread
https://www.rx7club.com/old-school-other-rotary-63/rotor-corolla-881991/

so you think the 160lph shoudl be good even at raised boost levels probably from creep? I'm just scared of going lean I really cant afford to rebuild. I can barely afford to get this thing running.

 

anyone else have opinions?

 

Use the 160 and don't run that car unless you have an FCD. That's all I got.

 

A 255lph on stock injectors w/ stock computer is WAY too much. I had one in my car when I got it, everytime I started it up that would be a puff of black smoke from excess fuel it had forced into the housing. Plus it was always hard to start when warm for that exact same reason.

I replaced it with an FD pump, which from what I've read is good to 300+hp and I haven't had any of those problems since.

For what you're looking to do (12psi or less on stock turbo) you're best off:
- selling the walbro
- re-wiring the stock pump (or FD pump),
- getting the injectors cleaned (assuming they havent been already)
- get an FCD or Rtek 1.5
- maybe an aftermarket Fuel pressure regulator

 

The measured flow of the stock TII pump can be found here: https://www.rx7club.com/showthread.php?p=9154530. I also found some flow data for the walbro GSL393 here: http://www.inlinefuelpumps.com/images/gsl393-psi.jpg.

Side by side, and with some conversion factors ( 1 bar = 14.7psi, 1 GPH = 3.79 LPH), it looks like the GSL393 outflows the stock TII pump where it counts. The y-axis values on the GSL393 graph are a little screwy, so these LPH numbers are just estimates by eye.

<table x:str="" style="border-collapse: collapse; width: 297pt;" border="0" cellpadding="0" cellspacing="0" width="396"><col style="width: 77pt;" width="103"> <col style="width: 71pt;" width="95"> <col style="width: 75pt;" width="100"> <col style="width: 74pt;" width="98"> <tbody><tr style="height: 12.75pt;" height="17"> <td style="height: 12.75pt; width: 77pt;" height="17" width="103">Pressure (bar)</td> <td style="width: 71pt;" width="95">Pressure (psi)</td> <td style="width: 75pt;" width="100">TII pump (LPH)</td> <td style="width: 74pt;" width="98">GSL393 (LPH)</td> </tr> <tr style="height: 12.75pt;" height="17"> <td style="height: 12.75pt;" x:num="" align="right" height="17">0.5</td> <td class="xl23" x:num="7.35" x:fmla="=14.7/2" align="right">7.4</td> <td x:num="" align="right">224</td> <td class="xl22" x:num="227.4" x:fmla="=60*3.79" align="right">227</td> </tr> <tr style="height: 12.75pt;" height="17"> <td style="height: 12.75pt;" x:num="" align="right" height="17">1</td> <td class="xl23" x:num="" align="right">14.7</td> <td x:num="" align="right">201</td> <td class="xl22" x:num="217.92500000000001" x:fmla="=57.5*3.79" align="right">218</td> </tr> <tr style="height: 12.75pt;" height="17"> <td style="height: 12.75pt;" x:num="" align="right" height="17">1.5</td> <td class="xl23" x:num="22.05" x:fmla="=14.7*1.5" align="right">22.1</td> <td x:num="" align="right">183</td> <td class="xl22" x:num="208.45" x:fmla="=55*3.79" align="right">208</td> </tr> <tr style="height: 12.75pt;" height="17"> <td style="height: 12.75pt;" x:num="" align="right" height="17">2</td> <td class="xl23" x:num="" x:fmla="=14.7*2" align="right">29.4</td> <td x:num="" align="right">164</td> <td class="xl22" x:num="198.97499999999999" x:fmla="=52.5*3.79" align="right">199</td> </tr> <tr style="height: 12.75pt;" height="17"> <td style="height: 12.75pt;" x:num="" align="right" height="17">2.5</td> <td class="xl23" x:num="36.75" x:fmla="=14.7*2.5" align="right">36.8</td> <td x:num="" align="right">140</td> <td class="xl22" x:num="189.5" x:fmla="=50*3.79" align="right">190</td> </tr> <tr style="height: 12.75pt;" height="17"> <td style="height: 12.75pt;" x:num="" align="right" height="17">3</td> <td class="xl23" x:num="" x:fmla="=14.7*3" align="right">44.1</td> <td x:num="" align="right">125</td> <td class="xl22" x:num="180.02500000000001" x:fmla="=47.5*3.79" align="right">180</td> </tr> <tr style="height: 12.75pt;" height="17"> <td style="height: 12.75pt;" x:num="" align="right" height="17">3.5</td> <td class="xl23" x:num="51.45" x:fmla="=14.7*3.5" align="right">51.5</td> <td x:num="" align="right">106</td> <td class="xl22" x:num="174.34" x:fmla="=46*3.79" align="right">174</td> </tr> <tr style="height: 12.75pt;" height="17"> <td style="height: 12.75pt;" x:num="" align="right" height="17">4</td> <td class="xl23" x:num="" x:fmla="=14.7*4" align="right">58.8</td> <td x:num="" align="right">85</td> <td class="xl22" x:num="162.97" x:fmla="=43*3.79" align="right">163</td> </tr> </tbody></table>

 

Wow thanks for the awesome post and graphs "rotaryrocket" so it looks like using the gsl393 will work out ok

 

Yeah, it will work, but I'd still wonder about it at higher boost levels. It basically falls between the TII pump and the FD pump. The FD pump, which is generally assumed to be good for about 300 whp, flows about 210 LPH @ 50 psi & 190 LPH @ 60psi. The stock TII turbocharger has the potential to make 250-ish whp, so if you turn the boost up to ~12 psi, you may well be reaching the GSL393's limit.

Lots of flow data here for stock & aftermarket fuel pumps:
http://www.stealth316.com/2-fuelpumpguide.htm

 

well i dont plan on boosting too high probably just around 10pounds or so for now or whatever it work out to be If I get boost creep. but you figure the pump will be good for my setup for now? When I upgrade injectors etc I will porbably buy a higher flowing pump just to be safe.

all this stuff is new to me im used to slow *** corollas with N/A 4ages never needing a upgraded pump, this is the first time ive ever had to upgrade to a higher flowing pump.

 

I should add that if you want to try to run higher-than-stock boost (5.5psi S4, 7.5 psi S5), the 550cc injectors will become a limiting factor sooner than that fuel pump. I'd keep it at about 8-9 psi max to avoid maxing out the primaries before 3800 RPM, when the secondaries come online. Depending on the EMS you're using, you can compensate for this somewhat by changing the staging RPM.