EFILive tune with rising rate regulator?

[loafycleetus]

Hello all. I have been in the process of acquiring parts to turbo my L31. I have everything that I need to put the turbo on the truck minus the intake. Has anyone done a EFILive tune with the stock intake and a rising rate regulator for 5psi of boost? I plan on using a ball bearing turbo with 60 a/r compressor 1.0 a/r turbine. Compressor wheel is 61 mm inducer 90 mm exducer, exhaust wheel is 74 mm inducer 62 mm exducer. The turbo is a little small but the price is right. I really want to go boosted, waiting for the means to purchase the intake, injectors, lines, fittings ect. will take eons with the lawns slowing to a crawl. Whatcha think?

[haulinit]

Are you talking about using a FPU?

[loafycleetus]

Are you talking about using a FPU?

Yep, they have many different acronyms but it references boost and raises the fuel pressure by crimping the return down. I plan on using a BEGI unit that is fully adjustable for onset pressure and gain.

[bai78]

I have an EFI BBP tune. My setup does have a BEGI FMU/variable rate FPR but it is s/c instead of turbo running 8-9 psi of boost. I have seen upwards to 80psi of fuel pressure, which fuels my setup just fine for the time being.

http://carphotos.cardomain.com/ride_images/3/2975/3421/32436710038_large.jpg

[loafycleetus]

That is great news. I am not going to run more than 5-7 psi, it really depends on what my afr is. I am going to use a cos3 boost tune. I need some education on tuning with the rising fuel pressure if anyone has been there and done that. I suppose I could fork out some serious dough and get it dyno tuned by someone familiar with efilive. Are you running poppets or the mini injectors?

[haulinit]

Since you have EFILive I take it you have spent some time on there forum? I have only had bad luck with them but others seem to like them.

[Aloicious]

I have a boost/vacuum referenced regulator on my truck, works great, when tuning for one on a return style fuel system its real easy, you just need to make sure your injector flow rate table is all the same, (i.e. all cells in the table need to be set to what your injectors flow when unreferenced). vs a non-referenced, returnless stlye setup which is much more complicated and requires sloping the table based on manifold pressures.

[Aloicious]

Since you have EFILive I take it you have spent some time on there forum? I have only had bad luck with them but others seem to like them.

what problems have you had over there? folks are usually pretty helpful over on their forums.

[haulinit]

what problems have you had over there? folks are usually pretty helpful over on their forums.

Sorry miss typed, I meant the FMU. Self :fail:

[Aloicious]

Sorry miss typed, I meant the FMU. Self :fail:

ah, what one were you running?

[haulinit]

ah, what one were you running?

I have never ran one on anything of mine. My experience with them are with turbo hondas and such. What brand I cant remember but it was blue IDK.

[Aloicious]

I have never ran one on anything of mine. My experience with them are with turbo hondas and such. What brand I cant remember but it was blue IDK.

ah, yeah. mine is aeromotive, I don't know the part # off the top of my head though.

[haulinit]

It would do funny things to the cars, but most of them where untuned. One car was my old room mates honda (mean lil bastard) when I say built it was built but untuned. Keep messing with the FMU and fuel pressures finally just unhooked it and made adjustments via the AFPR, car ran much better.

[Aloicious]

It would do funny things to the cars, but most of them where untuned. One car was my old room mates honda (mean lil bastard) when I say built it was built but untuned. Keep messing with the FMU and fuel pressures finally just unhooked it and made adjustments via the AFPR, car ran much better.

ah yeah, mine is just an AFPR that is referenced to boost/vacuum, its not one of those boost-a-pump setups. it does well, but with my setup I don't need tons of pressure, since my injectors are big enough to handle the power. I've got it set, un-referenced at 45psi, and I see ~40psi under vacuum, and I've seen as high as mid 50's under boost. so its not a dramatic range. I run 39# injectors, and currently have ~6psi of boost, which will be increased to ~7-8 psi in the future.

[haulinit]

Ya this was one of them boost a pump rigs.

[bai78]

Are you running poppets or the mini injectors?

I'm still running the poppets. Hopefully, soon I will make a swith to a true MPI system.

[loafycleetus]

bai78, how did you tap in to your return line? I was thinking of pulling the steel fuel supply/return off and brazing in some -6an fittings on the return side.

[Fast305]

Hello all. I have been in the process of acquiring parts to turbo my L31. I have everything that I need to put the turbo on the truck minus the intake. Has anyone done a EFILive tune with the stock intake and a rising rate regulator for 5psi of boost? I plan on using a ball bearing turbo with 60 a/r compressor 1.0 a/r turbine. Compressor wheel is 61 mm inducer 90 mm exducer, exhaust wheel is 74 mm inducer 62 mm exducer. The turbo is a little small but the price is right. I really want to go boosted, waiting for the means to purchase the intake, injectors, lines, fittings ect. will take eons with the lawns slowing to a crawl. Whatcha think?

I would not run the rising rate regulator. Get yourself a good fuel pump in the tank and swap to the GM MFI retrofit spider. Adjust the regulator to 80 psi and be done with it.

[bai78]

bai78, how did you tap in to your return line? I was thinking of pulling the steel fuel supply/return off and brazing in some -6an fittings on the return side.

I tried to get some better pics of the FMU & return line from the regulator. Unfortunately, there was too much to get a good view without taking apart the air intake tube to the blower.

My original FMU from the ProCharger kit had fuel lines and fittings for the return line to be routed through. Since the hardline from the frame rail routes into the regulator with a flexible line, it wasn't hard to fit things. The real PITA was getting to the connection. The truck is lifted so there really wasn't a way to get to it from underneath, unless you have really long arms :cussing:.

http://carphotos.cardomain.com/ride_images/3/2975/3421/32436710065_large.jpg

Hopefully, that made some sense.

[loafycleetus]

I would not run the rising rate regulator. Get yourself a good fuel pump in the tank and swap to the GM MFI retrofit spider. Adjust the regulator to 80 psi and be done with it.

Fast305, I do have the MPFI spider and a walbro 255 pump installed already. You are saying to raise fuel pressure to 80psi @ 0hg manifold pressure... How would you go about adjusting the regulator? I would have to figure out a way to bypass the regulator in the spider and install a external one right? :think:

[Fast305]

Fast305, I do have the MPFI spider and a walbro 255 pump installed already. You are saying to raise fuel pressure to 80psi @ 0hg manifold pressure... How would you go about adjusting the regulator? I would have to figure out a way to bypass the regulator in the spider and install a external one right? :think:

NO you wouldn't... The MFI spider has an adjustable regulator on it. The torx screw in the middle can be turned clockwise to raise the pressure. Mine came set at around 50 psi and I am running 65 psi on my Express.

[loafycleetus]

NO you wouldn't... The MFI spider has an adjustable regulator on it. The torx screw in the middle can be turned clockwise to raise the pressure. Mine came set at around 50 psi and I am running 65 psi on my Express. So you had to pull the top off and keep trying to set it where you want it? How predictable was it? I assume the pressure will go up some with boost acting on it, in a 1:1 ratio. That is pretty cool, I can try that and if my afr looks good I'll sell my fmu, got it for a steal. Very good info!!

[Fast305]

So you had to pull the top off and keep trying to set it where you want it? How predictable was it? I assume the pressure will go up some with boost acting on it, in a 1:1 ratio. That is pretty cool, I can try that and if my afr looks good I'll sell my fmu, got it for a steal. Very good info!!

No pulling the top necessary...Just re-install the fuel lines and the clamp that holds them without the upper plenum installed. Then hot-wire the prime terminal on the fuel pump relay. Then you can adjust the pressure while watching the gauge. It worked well. The boost will raise the fuel pressure at a 1:1 rate, just like any other car, but the pressure on the tip of the injector is increasing to. The injector will still flow the same. It was much more predictable than a FMU. I remember a member on here having one on a Vortec 305 that was supercharged. At 5,500 his engine would start cutting out. His fuel pressure was getting above 100 psi on the poppets and cutting his fuel!

Finally raising the fuel pressure to 80 psi working will raise your fuel flow from 24# to 26#, not a huge jump, but certainly helpful.

[loafycleetus]

Thanks 305, I had a brain fart. It seems like a great plan, plus I won't need to jack with hacking up the fuel lines.