My MPI Conversion (w/ pics :D !)

[GLHNSLHT2]

with sequential the injectors can't shove enough fuel through them in the time they have so they have to become batch fire and fire the injectors twice.

[TurboTurismo]

I am pondering the idea of running a 91 turbo sbec comp and do the nessessary added wires to my Lbody, I have aready made it a 90 sbec tbi car, a friend of mine just finished doing this yesterday. Now he runs his mini without the turbo and has a tbi exaust manifold, factory injectors, and factory turbo computer, just the turbo is gone and it is faster than my car.. he has no wot issues at all....its doable..Just not sure why people have gone thru all the problems of using tbi comps and trying to make em run when the turbo setup w/o the turbo apparently works fine..

Robb http://www.cardomain.com/ride/2291434

[ZoskalonMPI]

Quote:

Originally Posted by Robb a friend of mine just finished doing this yesterday. Now he runs his mini without the turbo and has a tbi exaust manifold, factory injectors, and factory turbo computer, just the turbo is gone and it is faster than my car.. he has no wot issues at all....its doable..Just not sure why people have gone thru all the problems of using tbi comps and trying to make em run when the turbo setup w/o the turbo apparently works fine.. Robb http://www.cardomain.com/ride/2291434

well, its not like the engines themselves are identical, but I would think a TBI engine would have more power than a non turboed turbo motor. TBI would have a higher compression and camshaft that opend the valves up more, am I right? Or would the bare non turboed turbo be better at N/A than a TBI? Wouldn't make sense though.

And its a LOT more work swapping in the harnesses and ECUs, yet alone finding them, then just splicing a couple wires.

Also something about the spark curves on a turbo ECU being set to match a turbo.

[TurboTurismo]

I would think the TBI with the higher compression would be better .....LOL my freind had the wrong dissy in there from a tbi car and it wouldn't start.. He figured it out and put the turbo dissy in and wammo..it runs...He used a tbi engine and head for the setup... My biggest prblem doing this seup is I want to stay with 90 and up electronics.(SBEC) I guess I could splince in the extra wiring for the turbo setup and use the turbo comp.. I only have the wimpy 14 lbs tbi pump and its an L Body so...I am screwed for finding a higher pressure pump that will fit the lbody specific hanger. Other than the expensive and overkill of the Walbro of coarse

http://www.cardomain.com/ride/2291434

Robb

[ZoskalonMPI]

What's a dissy? I put in a TI 92 SBEC turbo comp and harness into my 92 Daytona and I got zero power to the car. No lights, no nothing. So I put my old electronics back in and wait till it warms up a bit to go and check over all the connections. I'm hoping I can fix that harness, argh! Unless there is some other thing thats wrong.

[DaytonaTurbo87]

He never said he was running a turbo engine w/o turbo. He said a turbo setup, which I assume would be the turbo intake, throttle body and electronics bolted to a tbi block/head. Yeah, a turbo engine w/o turbo does not run great, lower compression and that cam don't make for fun.

Sequential is nice and all, but I didn't make a point of getting it. The SBEC computers are not tunable(AFAIK) with dcal/chem so they're useless to me in that sense, plus they are so much harder for me to find around here, so screw that, lol. Heck, I changed a 87 lebaron T1 harness(very plentyful and dirt cheap in the junkyards) to T2 spec and stuck it into my bro's n/a rampage with a 87 T2 LM, and it runs just fine. For fuel pump, we kept the original fuel tank and just added in a walbro 255 in-line pump. Works beautifully, and real easy to service. Got the walbro new on ebay for like 90 + shipping I think. I don't even think I can buy a new OEM pump for my daytona for that price.

I think when summer rolls around and he gets the rampage out of storage I'll have to tape a lil video of it idling then doing a WOT run just to quiet down all the non-believers.

IMO if you can't do the wiring changes or you can't find a turbo harness for your specific car, then just leave it alone.

[DaytonaTurbo87]

Quote:

Originally Posted by ZoskalonMPI What's a dissy?

Distributor.

My suggestion is to just wait until it's warmer outside and you can afford the downtime before you start playing with it. It's a fair amount of work to swap harnesses, especially if they don't work.

[TurboTurismo]

agreed on the temps...My car sits thru the winters.....I am a firm believer in the mpfi and can hardly wait to try the project out......If I used the said inline pump, would I need to remove the fuel pump from the tank and use a carbed pickup? I found a 90s turbo leBaron to get all the stuff from when needed. Just have to figure the pump out.......Thanks for the good advice DaytonaTurbo87.. I changed my carbed car to tbi and did all the wiring from a 90 Omni with the funny dash..I love the way the SBEC comp makes the car Idle......

http://www.cardomain.com/ride/2291434

[sgtarky]

I think an adjustable fuel regulator may solve many of the problems using the tbi computer.

[ZoskalonMPI]

Quote:

Originally Posted by sgtarky I think an adjustable fuel regulator may solve many of the problems using the tbi computer.

I was thinking the same thing, and it'll come in handy in the future for more crazy ass mods. What are some good regulators? And by good, I mean inexpensive, yet functional.

[sgtarky]

I think its a bosche regulator you can get any kind you want, however you have to modify it. I am told the buick grand national regulator is direct bolt on. still its 90 bucks at least. I know someone here has made adjustable regs, I am pretty handy but that is a little too much effort for me.

[sgtarky]

I was trying to find a thread where I asked about adjustable fuel pressure regulators. here is one I foulnd tho. Afpr

[ZoskalonMPI]

Hey, thanks for helping out, I decided not to do ANYTHING in terms of fixing the idle until I get the TI harness into the car, I wouldn't want to have to adjust everything twice.

[sgtarky]

well, I am not going use anything but tbi harness and computer. I seen in the megasquirting an omlet thread a guy is doing a full megasquirt build up completely removing the factory computer.

[pmcnamara]

Guys..

I know that Mike has some instructions and pictures on his page of how he did his TBI to MPFI conversion, but I also have comunicated with Zosk on a couple of occassions about issues and problems he had following those directions.

Robb it sounds like you did a project with mixed results and sgtarky sounds like you had better luck.

I am trying to do this project. My situation is a little bit different then some of the other folks on here.. 1.) My car is not street legal, its a race car 2.) Its a circle track car not a drag racing car.

What that means is I am never at idle or under 3000 rpm in race conditions... I'm generally going between WOT at 6100 rpm, dropping into the mid 3000 range through the corners.

Our track has very limiting rules -- no turbos, no 12/16v motors, no DOHC. In fact, we can only use "stock" part.. but they don't have to be in "stock configuration.

I need a bigger motor.. my Daytona is struggling against the lighter non-Mopars and I want to go faster..

I have spoken with several members who feel going with a carb'd 2.5, higher compression engine is the way to go.. I have spoken with others who feel the MPI is the way to go.

I'd like to know 1.) What is the best way to go in an N/A application 2.) What is the process (step-by-step) to do so. It would be a fantastic project if we could write a step-by-step guide to post in the Technical Help/FAQ area as a permenant part of TD.

Any TD folks in Michigan or Great Lakes region (that includes London, ONT) who are interested in giving a short track racer a hand, I'd be super appreciative.