Well, I already did, and it ran, but I have a coolant leak under the dynamic chamber. There is also a coolant port that runs straight up from there with dampness around it but I replaced the hose and it still leaks. It pools up next to the primary fuel injectors.

To complicate things further, I didn't realize there was a difference between front and rear housings and of course, with a 50/50 chance, I built it with them swapped.

Thank you for any help!!! It is an '88 GTU non-turbo

 

Im not sure about your new problems but using turbo rotor housings in an n/a engien will serious KILL your top end.
I mena if thats all you had and you needed a car i full simpathize, but if you had a choice that wasnt a smart idea.

 

ideally you can but you'll have to run 2 front tII housings because the rear has a coolant passage for the intake manifold (which could the cause of your leak). and in doing this, the seals may not sit right on the rear rotor because of the groove that was left by the old front rotor seals.


either way you swap it, you're gonna have that leak because of the coolant passage. your best bet is to use the tII front housing and the n/a rear housing.

 

i thing he's talking about the rotor houings, not the side housings....

 

Exactly, or just tap the hole, and put a head less allen (or AN) bolt on it.

 

it's called a pipe plug and T2 rotor housings were both drilled through, not just the rear.

and why would T2 housings kill top end power? they are identical to n/a housings with the exception of the coolant port and the exhaust diffuser for noise reduction.

 

what's the purpose of the front rotor housing drilled? i took a look at the tII intake manifold and it didnt have the hole for coolant as the one for the rear. it look as if it wouldnt pass through anything

 

no 5th&6th ports.

However, i know someone pushing 250hp with turbo housings and S4 N/A rotors. This is of course with huge ports, S5 manifolds and all sorts of fancy sheeyat.

I would think a stock ported and otherwise stock N/A engine with no 5th&6th ports, which is essentially what he has, would be significantly slower up top.

 

That's in the end plates, not the side housings. Using T2 side housings would be fine.

 

mazdatrix or probably your local parts store has 20mm freeze plugs that you need to JB weld into place. that will fix your coolant leak.

 

oh ****. dont ask why i was picturing the endplates... i'm stupid haha.

 

Ya'll REALLY need to get your **** wired together here folks...... nand i'm not picking on this guy in particular, I'm just using it as an example.

When talking about housings, the NORMAL Lingo we usually use

is

Front Iron
Front Rotor Housing
Center Iron
Rear Rotor housing
Rear Iron

There are not the FACTORY designations, but its what we commonly call things here on this electronic disaster area!!!!!


If you put s4 N/A in front of the particualr term... there we all will know EXACTLY what you are talking about..

If you just say "housing".. you are going to get what we have here today.... failure to communicate!!! (Good "Cool hand Luke" reference huh???)

And as for the rotor housings.. If i have to buy new rotor housings for an N/A.. I always get the Turbo Rotor Housings cause the don't have the stupid iron spliters in the exhaust ports

 

so we're all in agreement that he's talking about the rotor housing...right?

 

If he indeed is talking about the Rotor Housing then there is no problem in using the Turbo Rotor Housing. When my N/A engine was rebuilt we used the Turbo Housings and I have had no problems at all.

In fact, my engine is kindof a bastard. It has 89 Steel Housings with Turbo Rotor Housings with 87 FI.

Runs Great. Last Chassis dyno with a very restricted exhaust was at 150HP to the Wheels.

Runs Mid 15 Quarter mile.

 

ok...back to my previous question to Karak:

 

So I'm getting mixed messages! Is it okay to use Turbo II front and rear housings with s4 N/A front center and rear irons! I've always heard it was fine and didn't require any modifications.

 

My bad, but at least i think everyone knew what i was talking about!

 

yes it is ok to use them but some modification is required.

 

housings are made in runs, by leaving that port open they save .5 oz of aluminum and do not have to change their machining process since the LIM blocks the flow anyways. don't ask me why manufacterers do some things but i can only speculate and in this case i would say it is to save time and money of having to change their manufacturing processes.

 

Okay so what exactly do I need to do if I'm using TII housings with s4 n/a front centre and rear irons?

 

Plug the coolant passages above the exhaust port near the top of the housing. After that you're good to go.

 

you don't even really need to plug the passages if you seal the LIM properly though it is a bit more safe to plug them.

 

Thanks for the great feedback. Yes, I meant the front and rear rotor housings. Sorry for the confusion. (I'm still trying to figure out what s4 stands for?).

I bought the new rotor housings from a place in Canada. They didn't have NA in stock and told me the turbo ones would be even better. I wish they had mentioned the coolant passage. I'm hoping I can plug this without disassembling the engine? Time to break out the shop manual but I don't think it has a lot of detail about the coolant passages.

 

just get an O-Ring, cut a circle on the gasket, and the oring will seal agianst the flat part of your LIM