I have a vortech 8:1 fmu with a walbro 255 and a S-AFC setup to control my fuel for to 10psi of boost. Wanted to know if i removed the stock FPR for an Aeromotive FPR and put a Z32 Maf, do i still keep the Vortech fmu or take it out, because my friend told me that the Aeromotive replaces the fmu but need to tune it after

 

The FPR and FMU are two seperate items. You do not need to remove the FMU to put on the AFPR.

Why are you adding the AFPR exactly?

 

I'm planning to put larger injectors and more boost, so my friend that has a turbo civic said to change the stock fpr and get a aftermarket adjustable one, that can step up the fuel when in boost.

 

are you adding the injectors right away?

 

no not right away, but if i did install the fpr and the z32 maf on stock injector for now would it harm the motor.

 

do u know if Deatschwerks have any sale on the 370cc injectors for my year

 

so right now you have a walbro, FMU with the 8:1 disk, and SAFC? And you are wanting to add larger injectors, Z32 MAF, and AFPR?

Your first question is if you can add the AFPR now and not causing any problems? If so, yes you can add the AFPR. The AFPR is not going to interfer with anything, it just replaces the stock FPR to allow you to control your base fuel pressure.

Either you Honda friend is confused, or you are confused on what he was saying. You already have and FMU, which increases fuel pressure as boost pressure rises. That is not what a standard AFPR does. A standard AFPR allows you to adjust base fuel pressure but does not increase pressure beyond 1:1 as boost pressure rises. Your FMU is already doing what what your Honda friend stated..."steping up the fuel when in boost".

I have been away from the FI maxima seen for a while, so I don't remeber alot of specifics. Does a 10psi SC create enought power to need the larger MAF and injectors, or can you still stay with the stock MAF and FMU? If you can stay with the stock MAF and FMU I would suggest doing so. But if either the MAF or injectors will be maxed out then you will need to take the next step

 

hi
will a 10:1 fmu work well with a 8 psi turbo and safc or is it to rich or lean help

 

I think a few have done 10-12PSI on stock MAF, but some have maxed out the stock MAF at 10PSI. I think it really depends on the actual situation.

AFPR + Walbro + Stock injectors, you will need the FMU still. A AFPR only adjusts base fuel pressure, it is a 1:1 ratio, versus the FMU could be anywhere from 4:1 to 12:1.

If you get larger injectors, you can ditch the FMU. If you use AFPR/Walbro/Z32 MAF/SAFC and anything bigger then a 370, you may have some issues. Reason being, is the ECU cannot compensate for an injector that big, lets say 550. In order to get the car to idle properly you'll need to drop the base fuel pressure. That can cause issues in the upper end of the spectrum.

Ideally if you go with larger injectors, get an emanage/ultimate that way you can adjust the injector lag/duty cycles so you can run at normal fuel pressure at idle along with tons of other things you cant do with the safc.

 

stock FPR / Walbro / 550cc Deatschwerks / S-AFC and idles perfectly.

 

 

Im sure i remember reading somewhere that the ecu would have a hard time compensating for that large of an injector, causing some hard starting.

Hey jeeve, what type of corrections do you have in the upper rpm band to get a good a/f with stock fpr and 550's?

Id still get an EB/EU to tune it though. Much much better then the SAFC/VAFC

 

I know with mine @15psi from 4k on where i am in boost the most i have is 8% added fuel.

 

But until you got it tuned, you had a hell of a time starting it, and keeping it idling right?

 

Big D Pardon me for interrupting your thread..

But I have a question for I30TMike or anyone who can answer.

What are the difference's in Deatchwerks 550cc injectors and Tomei/Nismo 555cc injectors?

I was going to have my Jwt retuned for 555cc and they specify using nismo 555cc injectors. If I use any other name brand injector, I would need it flow tested so they can tune to match.

Is their that much of a difference between them?

 

idk but how is that jwt ecu working out for you, i think i want one?

 

I have not installed it yet. I have been running 12 psi on stock ecu and injectors with walbro 255...

I'm going to add the Jwt, 370cc injectors and J&S safeguard.

 

There is a lag time difference between Nismo 555s and DW 555s which manifests itself in problems with starting/idle/other extremely low IDC situations. Mike went through this himself actually with a JWT Nismo 555cc injector program using DW injectors some years ago. JWT has knowledge of this and I *believe* has a tune for DW 555cc injectors as well, but you'd want to ask them that specifically.

 

So the DW injectors are 555cc and nit 550's?
Do you know the specs on the DW injectors?

 

i think DW calls them 550s but that's not the issue, it doesn't matter if they flow 550 or 555 or 552 or 558 or whatever - jwt won't program things that specifically anyways. the issue is the lag time difference. i don't know which specs you are wondering about but lag time for them is available from DW and flow specs are of course available on the flow report that DW sends with each set of injectors.

 

Thanks a lot. I will contact Dw again...

 

Nope, not at all. Started right up without any tune on the S-AFC and was able to drive it around just fine, then I just street tuned the upper rpms with my wideband.

 

Hmmmm..... interesting. My max would barely start and barely idle right after installing the DW 555's. I believe Flava had an even harder time than me just getting his car started and idling.

Only diff. between your setup and mine is the aux fuel pump. I'm using the T-rex.

 

Hmm, you have a Z32 MAF too?

 

 

No crap, I had a h#ll of a time getting mine to start. As soon as I turned the key, the fuel pump kicked on and immediatly flooded the engine completely saturating the plugs to the point of hydrolocking with fuel, not to mention collecting in the oil as well.
I had to pull the plugs, and crank the car to blow the fuel out of the cylinders.
The only way I was able to get it going was to pull the fuel pump fuse and get Emanage opened to begin pulling fuel immediately once the car started.

 

I wonder if it had anything to do with the lag times like what neal mentioned?

It only makes sense, with the same lag times as stock, with injectors twice the size as stock, can the stock ecu compensate for such a large injector? Naturally i would assume no, but perhaps you can? Does it depend on the injector?