Here is my setup, I have plenty of power I am pretty sure I am over 500hp at the crank. 95 Yukon 4X4 6" RCD lift 305X75X16.5 BFG All Terrains.. Now here is where it gets interesting....383 Cu In. with Scat Forged Crank, 4340 H-Beam Forged Rods, Forged Dish Pistons, 8.5 to 1 Compression, Brodix IK180 Aluminum Heads, Full Roller Cam, Edelbrock Ceramic Coated Headers True Dual Exhaust, MSD Ignition W/Coil, Edelbrock Aluminum TBI Intake, Ported TBI Machined for Boosted Applications, 75lb Injectors, ATI Pro Charger D1SC With 2 Core Innercooler, Currently running small pulley and getting 11 to 12lbs of boost on 100 Octane Unleaded. Less than 2000 miles on motor and less than 150 miles on D1SC upgrade. I am currently running the FMU that came with the Pro Charger kit, this is where I get frustrated, I had Ed Wright Burn the chip and it seems to be ok, where I am having a problem is when I get to about 4300 RPM the fuel pressure starts jumping like crazy and I go into a very rich condition on my Wide Band Innovate logger. I think it is the stock tbi FPR, or the FMU is not working correctly. Do I have to run the stock FPR with the FMU or is there any upgrades to my computer that will allow me to tune my self and get rid of the FMU, I know I have more power to burn I am getting plenty of fuel the FMU has plenty more adjustment to give more fuel I just think the FMU system is a bandaid. I have spent lots of money on this system should I just upgrade the fuel system to a MPFI? Has anyone ever worked with the Edelbrock upgrade fuel system that works with our stock computer and uses the 8 injectors firing off the rail direct? Sorry for all of the questions you can see I need some help and any would sure be appreciated.

 

I'm not sure how much help you're going to get here seeing as nothing you've listed is thirdgen f-body specific.....BUT in the interest of a community I'll give my because I have a 97' Tahoe myself with a few mods. Your ECM or PCM for this matter runs a completely different code than what I'm used to working with so you really should start off in LT1Edit or PCMedit (others chime in if I'm off). The FMU is a band aid and all of us who have a procharger know it. That's why a few or maybe even alot of us have switched over to a ECM (749) and code that already has boost / fuel pressure tables in it (ie $58,$59,$60). If you're asking about the EdelB setup than I'd ask in the Alternative Port EFI Intake forum and possibly the DFI and ECM forum. Good luck.

 

Hey man...you could probably ask the moderator to switch this thread into the TBI section if it doesn't get enough hits. The TBI section has a legion of followers that have many different kinds of vehicles. Anyway...

Wow man that engine sounds pretty good. The cost of building a forged engine is what stopped me from doing it. I first thought 8.5 to 1 comp. ratio was a little low but for 12 lbs that sounds pretty good. I would be willing to bet that with a proper tune you could be doing a bit better soon. That leads me to my answer.

Dude...is this 12lbs that your pushing the same boost level you had on the previous set up? You should looking into fuel control methods...whether that means getting a new tune or better better fuel control equipment. Something that tells me its the tune. You changed something and the computer is only going to run what it knows...which is the old set up.

The TBI blower system I have is by Vortech for TBI Trucks. I has a Supplementary Fuel Injection System (SFIS) that consists of a 1 inch spacer made out of Aluminum that houses two Bosch/Ford style injectors. It has an old style Haltech ECM that (basically its a glorified on/off switch) turns on the aux. injectors when increased vacuum is detected via a vacuum tube/line. That's how my system supplements fuel. Pretty simple. I can add what ever injectors I want into it...the Haltech ECM does not care what injectors they are...its an on/off switch...that's it.

Ed Wright? Is that the SuperChips guy? I can see why you probably wouldn't want to take it back for a re-tune...he's expensive as hell right? Either way...I think you need a re-tune and go from there. Most likely you will run across the readings needed to know how much fuel is needed and not needed.

 

Well I am getting closer to figuring this thing out, I have narrowed it down to the stock FPR on the throttle body. The FMU is messing it up especially when it gets warm. The tune is actually pretty close I have to make up for the deficiencies by adjusting the FMU which is what I am trying to get away from. I do know I need to change the FMU I am interested in the Aeromotive FPR and possibly changing the ECM. Ed Wright is from Fast Chips out of Oklahoma. You can do a google search under Fast Chips or Ed Wright. I talked to him and he suggested I get it dyno tuned which I know I need to do, the problem with him doing it is he is in Oklahoma and I am in Tucson so I am hoping to find someone in the state of AZ at least. Thanks for the replies I will continue to research. The first thing I do is rebuild the TBI FPR and see if that fixes the jumping fuel pressure. It only does it when it gets warm.

 

Thanks for answering me, this is exactly where I want to go with this thing the ECM and the code that is setup with boost tables. How can I find out more about the ECM and Code. I really want to stick with the TBI if I can get away with it. It sounds like a few of you are getting the HP out of a properly setup TBI.

 

boa, you might want to look in the DIY PROM forum and search about the EBL. Other than the EBL acronym I don't know much about it other than it's supposed to be the shiznitz for TBI