1.8 injectors and Walboro 255lph on 1.6 with MSPNP
 

Other than basic tuning, and I expect to need some. Do I have to change any settings to run injectors from a 95 1.8, or to support a Walboro 255lph. I expect to see a bit more fuel pressure, and volume, so I think the car will be really rich once installed, but other than regular tuning do I need to change any settings.

Also is anyone running the GM boost module, or are you just relying on your wastegate, or a manual boost control?

IIRC you need to change your REQ_FUEL in engine constants to reflect your new injectors. the MSPNP manual has a section on doing this.

You might have issues with that 255 pump. People have had issues with the volume overwhelming the OEM FPR.

Since he has fuel control of his fuel map, it doesn't matter.

You really really need to spend some time searching.

It doesn't matter if the pump is over powering the FPR??

I understand, and I did, but none of the people I saw stating they had the over powering (Running Rich Issue) were using a MSPNP. Thats why I posted this.

I also have a complete 95 1.8 fuel rail coming with the injectors I bought. I don't know if rail is compatible, or if the FPR is any better, than the 1.6 fpr.

Won't work, 1.6 engines have different spacing than a 1.8. Same reason we don't use their exhaust and intake manifolds. Or entire heads for that matter.

Thank you,

I had no idea since I've never compared the 1.6 and 1.8 fpr's.

No because if the pump overpowers the FPR and the fuel is at a higher pressure than it would normally be, you simply reduce the PulseWidth of the injectors to compensate.

I didn't think it was a good idea for the FPR itself though as there have been cases of them failing. I figure with a higher pressure and flow it would be more likely for it to fail.

This may depend on the condition of the FPR, but what is the usual bump in fuel pressure?. Is it something substantial? 5, 10psi?

This is what I found.

"Regardless, there are still a few options in fuel pumps. The ideal pump is the Walbro 190 lb/h HP fuel pump. HP stands for high pressure. It is important you get a HP unit if you plan on raising the fuel pressure levels past 90psi. The HP models can supply fuel up to 130psi. The standard 190 lb/h fuel pump is maxed at 90psi and the standard 255 lb/h pump is maxed at 80psi. The 190 HP unit will not only supply four 700cc injectors with enough flow to maintain 40-50psi in the fuel rail (enough for 400hp), but out flows the 255 HP model after 100psi.

It is recommended for most applications to go with the 190LPH, 190HP if using a FMU."

This info came from the post below.
Miata Turbo FAQ: Fuel Pump

I would think I'm ok with the 255 as far as pressure is concerned, since I'm not using the band-aids approach as long as the stock FPR will hold. That actually my only concern, since I can adjust fuel as needed.

BTW I'm doing this because I think my stock pump is near dead, and an upgrade seems the way to go versus just a stock replacement.

It took 4+ years but my 255 (GSS342) over powered my stock FPR. Had to swap it out with another stock unit. Found when the car was off, the fuel pressure would drop to 0 in less than 5 mins... so I knew it was toast.

I would say, the 190HP is definately the better pump to "upgrade" to. <G>

Dave,

jesus fucking christ. Just hook the shit up like everyone else and tune fuel, it takes like 20-minutes. WTF is so god damn difficult about tuning the VE table?

Thats the plan, both the injectors and pump should be in this week. I'm not scared, I just want to know what to expect.

You should expect to tune the VE table.

lolz get em hustler!

The injectors and pump both came it, I guess I have a weekend project.