turbo for L4

[coop8267]

lookin for a turbo for my 84. i tried to find one from a mid 80's turbo thunderbird but came up short. whats a common car that has a displacement of 1.8 to 2.5 that i could get one from?

[Blue02R6]

Aren't Eclipse's in that range?

[fieroturbo]

NOOOOOOOOOOOOO!!!!!

Don't turbo the Iron Duke, ESPECIALLY the 84's! They can't handle enough boost to justify using them. Pontiac tried it in 84. Pfaff turbo's had a kit that was dealer installed, but it turned the car's into ticking time bombs.

Do something like what I'm doing; a turbo 2.2 Ecotec, or what somepeople are doing with Quad 4's. You'll be glad you did.

[IntegraB18LS]

right now in the mall section of PFF (www.fiero.nl) there is a full turbo kit forsale, used and cheap. cheak it out

[SigmaProjects]

what about the 2.0L ecotec SC engines that GM will be spitting out soon?

[goatnipples2002]

do the ecotec engines bolt up or do you need a special kit?

[Ragtop_Renegade]

2.5's will handle forced aspiration if they're rebuilt with super duty four(what used to be called Pontiac Racing, now generically lumped into the GM performance parts catalog) innards.

As for ecotecs, modern OBD II computer systems will only work properly in the vehicle they came out of!!!!! (I've said that so many times I feel like a broken record)

[goatnipples2002]

If you can put an ls1, ls6, 3.8sc or a 3.8na in a fiero I am very sure you can put an ecotec in there. I am not worried about obd2 or the wiring as of yet, just will it bolt in or do I need a special tranny/motor mount?

[Ragtop_Renegade]

No. While 3800's have the same bolt pattern as a 2.8, and there are plenty of Chevy sb (be it ls1, ls6, or whatever) kits out there since the engine block has been only lightly modified in it's near half a century life, the ecotec is a all new, state of the art horse of a different color. The bell housing pattern doesn't match any of the stock Fiero trannys. The tranny will have to come out of a cavalier,malibu etc and you'll end up needing a recalibrated vehicle speed sensor if you plan to run other then the stock wheel and tire size the donor car had. You'll need custom welded motor/tranny mount points, and custom fabricated cv axels.

coop, one thing I didn't think of before: there are certain bugs to turbocharging a TBI engine. The big one is when you let off the gas the turbo is still winding down and pushing a little boost. All that extra air and not enough fuel to go with it makes for a really lean fuel mixture and is hard on the engine. This isn't a problem on MFI engines where the point of fuel entry is after the throttle plate.

[coop8267]

could you go with a bigger waste gate or maybe even 2 to let that boost off when you let off the gas? oh and i found a super duty short block so i dont have to worry about any timebombs ticking.

[coop8267]

or run a richer fuel/air mix

[coop8267]

maybe ill just supercharge it

[Ragtop_Renegade]

You could supercharge it, a centrifugal blower would fit in place of the AC compressor, or where the power steering pump would go if it was a FWD engine.

There are 2 ways to minimize the lean effects during turbo wind down, one is a nice big pop off valve - about $20- $100, the other, while being the best, is also more expensive - a fully programmable computerized turbo management system. They're about $600.00

Either way, turbo or supercharged, you will need a custom ecm prom made to properly manage fuel injection and spark timing - otherwise, when that turbo winds up for the first time and the stock ecm sees the MAP reading skyrocket it's gonna have a nervous breakdown.

[coop8267]

yeah i figured a big blowoff valve would be good enough

[Ragtop_Renegade]

It does the trick. Upgrade your valves and port the exhaust passages to avoid burnt exhaust valves caused by extra combustion chamber heat from the minor lean spot.