TruckSS

I'm new to this forum, and this is my 1st post. To start i'm young and poor (For now). So I don't have $5000 for a supercharger kit or anything like that. So what i wanted to ask of you older and wiser gearheads is about cheap turbocharging. The truck is a 89 chevy c1500 short bed reg cab. It has mild Tbi 350/5.7. Some head porting, shaved heads, comp friendly cam, open long tude headers ( it's loud), throttle body spacer and turbo city adjustable MAP sensor. Now I know I mock up piping and set everything up, what about the fuel. Will FMU work on a Tbi injection setup. Someone told that the TBI will hold 5 to 8psi no problem before it leans out and blows bone stock. Is this true, if not what can be done and how would i go about. Will everything work fine with a custom chip. Or can I just use a FMU and MAP to tune. If anyone has any info or website to go to let me know. Also any Exp with the Turbo city adjustable MAP would help.

vanillagorilla

iTrader: (1)

I never had good luck with my TBI. If I were you, I'd see if I could ditch it in anyway possible. Or get one of the aftermarket conversions. You can score them on ePay cheap. I don't think a MAP sensor and an FMU are going to help you tune your truck. You should probably have a custom chip burned....perhaps while on a dyno. Look into to Tunercat. Its a software program that will allow you to tune a TBI truck. Also if I'm not mistaken the TBI engines run at about 12-15psi for fuel pressure.

TurboGibbs

iTrader: (6)

You would definately need to go with 454 injectors and a custom tune. Getting too agressive can cause problems with TBI none the less. Check out Brian Harris @TBIchips.com he has been doing the tuning on my 383 TBI truck via mail and I know has had experience with centrifugal chargers on TBI. He has software you can download for logging with a laptop that will be essential in getting the tune nailed down. Tell him Mark Howard sent you.

NXRICKY

iTrader: (1)

I built another standalone system, 2 extra injectors, and its own computer. That way the vehicle remains in a pure stock until the boost starts to come in, total programable.
Ricky

TruckSS

Thanks for the info. Right now I have turbo from a dodge diesel around a 2000 or so, and some piping just sitting around. I think im going to fab everything up, and see how it works on 4 or 5psi. the only thing i need to buy is FMU.

TruckSS

I also might try to a extra injector with a boost ref switch

kbracing96

iTrader: (26)

FYI, your going to need a small FMU, like 2:1. TBI only run about 14 psi of fuel pressure, and will lock up around 35 psi. I ran a 5:1 and had to put a restrictor in the boost reference line to the FMU and a bleeder valve to let some of the boost out of the ref line to get it down to about a 2:1 before it would work on the TBI s-10 I turboed.

TruckSS

That's what I need to know. thanks! I'm going to start on it in a few weeks. right after i put the motor back in my blazer so i have something to drive if i blow it up. I'll post some pic when i start.

mzoomora

iTrader: (31)

I used an adjustable MAP from turbo city before on my TBI. Nice unit actually. Allowed my SBC S10 to EASILY pass emmisions with a 230 duration cam. I think I kept mine at about 1.5 volts idle for everyday driving and 1.2 ish at the track.
Also, if you use the 454 throttle body you have to use a stock intake. You can use a Edelbrock but when you bore it you hit a few passages under the mounting pad and have to weld it closed again.