D15B2 turbo setup, done correctly

I am interested in doing a complete home made turbo kit for my 91 sedan. The DPFI is to be kept, as well as the a/c. I have already read over homemadeturbo.com, as well as searched this forum. If you can offer advice, please do it, but please do not suggest other motor options/setups. Here is an inventory/question list:

- Turbo.... for factory engine, maybe ported and polished head...wastegate....? - some companies on ebay have manifold/turbo/downpipe kits.... T25, T3/T4.....

- cast exhaust manifold... better than mandrel bent stainless?

- radiator... I've seen some half width ones utilizing the factory frame size and mounting locations, but where to purchase? seems like factory might work with some turbos...

- Is the Venom aftermarket injector kit for the D15B2 what I am wanting for the application? any other 2 injector kits?

- of course a high flow fuel pump... brands/stats?

- intercooler to fit in factory bumper... I've seen a few

- pressure piping will be covered, as well as BOV

- oil lines/fittings... possibly aftermarket oil pan for the hell of it.

- ive looked at an Accel complete ignition kit, any luck with those?

- any way to route PCV system other than to put a breather-filter on it as it exits the valve cover?

- aftermarket clutch with lighter flywheel... think 12lb is good, or would lighter be better for turbo app.?

- for those that have done turbo on D15B2, what are some safe boost levels for factory internals? does 8psi sound unreasonable (judging from the ~6-8psi for jackson racing supercharger kits for factory motors)? will I be able to keep the a/c without having to modify it?

thanks for any insight....

i wouldn't be worrying about boost on stock internals. I'd be worried about getting enough fuel to the engine with boost with just 2 injectors. I personally wouldn't run boost on the "dual" injector setup - just not as efficient. You're barely getting enough fuel with no turbo. I'd highly recommend upgrading to the mpfi and also upgrade those injectors. Also, I can't think of any cast iron manifolds that will work with your a/c setup. I am going towards making either a custom adaptor pipe or a custom log manifold to move the turbo over so it doesn't interfier with the a/c.

ugh. there is definitely no room for a turbo with the a/c compressor... too bad

i wouldn't be worrying about boost on stock internals. I'd be worried about getting enough fuel to the engine with boost with just 2 injectors. I personally wouldn't run boost on the "dual" injector setup - just not as efficient. You're barely getting enough fuel with no turbo. I'd highly recommend upgrading to the mpfi and also upgrade those injectors. Also, I can't think of any cast iron manifolds that will work with your a/c setup. I am going towards making either a custom adaptor pipe or a custom log manifold to move the turbo over so it doesn't interfier with the a/c.


100% agreed.

to the thread starter: Sorry to bust up your idea about DPFI turbo, but if you get it to run, its not going to last. You can do it, but it's not going to last, or make much power. You will blow your motor.

DPFI is a definite NO..it responds horribly to slight modifications to the intake it wouldn't know what to do with boost. I do have to contradict the statement that the injectors can't supply the engine with enough gas with no turbo, I've seen dual point set ups capable of running very rich indeed, and quite frankly I think they could handle a small amount of boost, but it would run like poop. Going turbo would most defintely require you to change your ECU, wire for MPFI and change your intake manifold out along with your throttle body and all that. It's not gonna be real cheap and not gonna be real easy...and you want to keep your AC? ahh, good luck man.

yes, the idea is dead now. I must have the a/c. thanks for advice

The a/c can be done - I'm working on an a/c compatible setup right now. Just waiting on a few more parts. If you are interested pm and I'll let you know what I've got and what kind of stuff you'll need for a simple turbo setup to work with the a/c.

yes u can turbo a d15b2, i've seen it done and worked fine
u do however have to install a 3rd injector in the piping before the dual point box, (think its called a cold start injector) it should be able to handle 8 psi. i've seen stock motors handle 12 - 15 to be honest, but thats because they are tuned absolutely perfect
theres a guy out here with an EK sedan, stock motor, with ac, running 15 pounds, and automatic... it runs 13.1 on radials :) very very nice. but he's running the greddy e-manage to tune it as well which is a good idea IMO, however his FMU fucked up sunday, so hes eliminating that as he was running way 2 rich with it

I didn't say you couldn't really - I just meant it wasn't really worth it. He'd be a lot better off running a multi point fuel injection. It'd probably be a lot easier for him to tune and stuff.

yea
thats what i'm doing, mpfi swap, then boosting 6 or 7 psi

Yep, me too - my welder is actually thinking of making a log manifold for me, so I'll probably outfit it with a custom wastegate flange for later. I'm going to run 7psi for starters, then after getting it all tuned up nice and see how everything runs I might up it to 9 or 11psi for the track. We'll see. I'm still doing all my relocations to fit the turbo the way I want with the a/c still on. But it's going together nicely. I'm almost ready to start making the manifold and downpipe. Once those are done I just have to get the intercooler piping and the ecu rechipped for turboedit and I'm ready.

a 3 injector setup...talk about ghett0 rigg3d.

yes u can turbo a d15b2, i've seen it done and worked fine
u do however have to install a 3rd injector in the piping before the dual point box, (think its called a cold start injector) it should be able to handle 8 psi. i've seen stock motors handle 12 - 15 to be honest, but thats because they are tuned absolutely perfect
theres a guy out here with an EK sedan, stock motor, with ac, running 15 pounds, and automatic... it runs 13.1 on radials :) very very nice. but he's running the greddy e-manage to tune it as well which is a good idea IMO, however his FMU fucked up sunday, so hes eliminating that as he was running way 2 rich with it


that's cool and all for the EK sedan, but those are not DPFI.

dpfi can be done but not recommended, would be better to switch to mpfi, has better tuning capablilities

that's cool and all for the EK sedan, but those are not DPFI.


i know, but i was stating that turbo can still be done with A/C intact :)