i am currently running:

-stock pump
-stock fpr
-vortech 12:1 fmu
-stock injectors (19lb / 200cc i think)

car does great up to 5psi of boost, but above that the power drops off (im sure due to the fuel system).

anyone have any suggestions on the best/easiest/cheapest fuel upgrade?

-i have considered bigger injectors, but i don't know how to control them so that the car will still idle and run ok off boost.
-i have considered extra injectors in the charge pipes and an injector controller so that they only spray on boost
-i have considered a 10:1 fmu disk, but the car runs so awesome at 12:1 and the EGTs are good (they aren't too low to make me think im running rich now) i don't want to tear **** up
-i have tried a bigger fuel pump, but it was so overkill that the car ran disgustingly rich

any help would be appreciated

 

larger injectors and turboedit for management assuming you're running obd0

 

If you want a supplementary fuel controller I am selling one on Ebay. Hint hint.

Are your stock injectors really that big? My Kia came with 15# injectors and I upgraded to 19#. (Soon going to 24# and an S-AFCII)

Doesn't a 12:1 FMU provide more fuel pressure than a 10:1? You seem to run out of fuel with the stock fuel pump and waay rich with a aftermarket?

My educated guess: Your stock fuel pump is quickly running out of steam. It cannot provide the 100 PSI you are asking of it at higher boost. An aftermarket pump can generate the pressure, though, and is making so much pressure that you are running rich.

So perhaps you need a smaller ratio on the FMU and stick that aftermarket pump back in.

 

the stock pump seems to keep up, but i dont think the injectors can. i haven't had a problem with running lean. With the other fuel pump (not aftermarket, it was a bosch pump from a vw that used much higher fuel pressures) the fpr couldn't handle the pump pressure, and the system was one pulsation dampener short, so the pressure stayed too high and vibrated bad.

im running the stock pgm-fi ecu (1986 model) i don't know if it is obd0 or not.

thanks for the input so far

 

its a pe7 ecu

 

yeah your best bet is get larger injectors

 

most of the websites i've seen list the pe7 ecu as "pre obd" can i still get turboedit and a romlutator for it?



Modified by therealtime at 10:27 AM 7/31/2004

 

You cannot use engine management on the 1st gen CRX because you have no control over the ignition curve. It's a vacuum-advance based setup.

You need to convert to electronic-advance to be able to run some sort of standalone. I did this when i swapped the 89 Integra engine into my 87 CRX Si. See my sig for details.

BTW-You cannot run a stock pump with a 12:1 FMU. You're asking that pump to put out 90+ psi of pressure. It will not make more than 75.

 

is it possible to swap the distributor and ecu without swapping the engine? i am happy with my d15a3, i just want to control the fuel (ignition would be a plus as well).

i am running 5 psi of boost and a 12:1 fmu. this translates to just over 100psi fuel pressure at full boost. with 300+ miles on the turbo, the pump seems to keep up just fine (and egts stay consistently between 1100 and 1500 F) that's not to say that it won't quit on me any day now though.

keep those replies coming, i am learning more every day!

 

If you install an in-car fuel pressure gauge, you'll see that the fuel pressure will stop rising at about 75 psi. There is an internal pressure relief valve that prevents it from doing so because that much pressure usually means that there is blockage in the system.

You can do the electronic ignition conversion by using the distributor from an 88-91 CRX Si. It will have the proper sensors and will be a close fit on the EW3 (D15A3). The 88-89 Intega or JDM ZC distributors will not work because the cam angle sensor is in a separate box outside the distributor (driven off of the exhaust cam).

You'll need to make about 10 ish wire changes at the ECU plugs and run some additional wires into the engine bay for the ignitor and the other sensors in the distributor. You also need VSS (vehicle speed sensor) and ELD (electrical load detector) in order to keep from throwing codes on the newer CRX ECU. I did all of this stuff on my car. You can see my site to see what I had to do.

Sonny

 

what is the ELD and where is it located? i have looked at your site (very informative), but i didn't see that part

 

provided i could figure out the wiring, couldn't i use a distributer from a 88-91 crx si, a pm6 ecu from an 88-91 crx si, larger injectors (whats a good size for 10 psi boost on a 1.5L?), a romulator, and turboedit?

how hard/expensive would it be to chip the pm6 to eliminate the vss (and maybe even eld) and not throw a code?

with that setup i would have fully programmable fuel and ignition curves right?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by therealtime &raquo;</TD></TR><TR><TD CLASS="quote">provided i could figure out the wiring, couldn't i use a distributer from a 88-91 crx si, a pm6 ecu from an 88-91 crx si, larger injectors (whats a good size for 10 psi boost on a 1.5L?), a romulator, and turboedit?

how hard/expensive would it be to chip the pm6 to eliminate the vss (and maybe even eld) and not throw a code?

with that setup i would have fully programmable fuel and ignition curves right?</TD></TR></TABLE>

That would be a good start for hardware. The ELD is embedded in the fuse panel of the 88-89 Integra and the 88-91 CRX. If you don't have it, the engine will hunt around at idle (very annoying). I am not sure if you can use TurboEdit to eliminate the ELD. Something tells me that it's probably not that hard. I'm not sure about the VSS though. VSS is a requirement of Hondata (the system that I was planning on using), so I had to do it. The HF gauge cluster takes care of it.

The 450cc DSM injectors will fit right in.

Sonny