Chazz13579

About to do a 5 speed swap in my 88 GTU Also about to put a medium street port on

Just looking for some suggestions, advice, whatever..

Also anyone know of places in michigan that do porting???? I see people do it the selfs, how easy is it?? Or should I get some help?

Chazz13579

What should I do with her?????

diabolical1

iTrader: (3)

welcome to the board.

it would be much better if you asked specific questions.

the manual conversion is a lot of work, but it should be pretty straightforward as long as you confirm that you have everything you need ahead of time.

as for the porting question, if you're good with your hands and can think spatially, then it's really not that hard. however, if you don't have a practice housing, then you should probably have someone experienced do it for you.

i don't know of places in MI, but when you get enough posts, you can check out the forum for your region and get local information there.

nepopolus

It is your choice, but I would stay away from the na power scene, a lot of money with not a ton of gain. If you want to keep the 6 port you can add a turbocharger on it, and it does not cost a lot of money if you snipe the parts used off here/ebay etc.
manual conversions can be annoying but most 80's cars are relatively straight forward, after you do the tedious task of finding all the parts.

Chazz13579

How would a turbo effect the stock engine?

Chazz13579

This car is 99% stock and I want to build it right.
Not the cheap way out.

nepopolus

6 ports are fine with boost added to them in a reasonable manner. They do require a efficient tune, and most likely you will want to upgrade your cooling system a bit for safety.

You have the lower compression of the 2 n/a engines since it is a s4, there is quite a few builds on here that opt for the s4 n/a rotors in a turbo build.

Just a stock turbo alone with supporting mods will get you in the 250-260 ish rwhp range at stock t2 boost levels, I would advise against going too crazy with boost on that stock engine.
The higher the compression of the engine the more critical tuning becomes when adding boost pressure. Higher boost can be utilized once you know exactly where your engine is at condition wise.

With the availability of turbo 2 engines out there it is also an option, But it will need a rebuild (especially a jdm engine) and you gamble buying hard parts that are out of spec, rotors, housings, side plates, etc.
The downside to building a 6 port turbo is the supporting mods that will need to be taken care of if you get power hungry, The trans and rear end will not be able to take that kind of punishment for long (250-260 range I would assume the trans and rear end can hold for awhile) But when you start pushing after that it becomes a time bomb.

Chazz13579

So what's a nice size turbo to start with?

kevin_syko

Gt35/40 b decent if u got decent fuel supply n ecu

diabolical1

iTrader: (3)

if you're going to insist on going turbocharged before knowing what you have and what you're doing with it, then i would have to advise taking neopolus' advice.

Chazz13579

Thanks a lot for the help

Aaron Cake

iTrader: (1)

Ignore most of the advice given in this thread. Don't just go hog wild with turbocharging the car because you'll just end up with a blown engine.

I'd recommend waiting and learning a little. Fix all the problems which will be present in the car. Make sure things are running correctly. You're going to have to put a lot more than you first assume into the car to get it running properly as, let's face it, the thing is knocking on 30 years old.

You are aware that to port an engine, the engine must be totally rebuilt, right? That being the case, the typical 15 - 20 HP you get from an NA port job (with supporting mods) is not worth the trouble if your engine is running and in good condition. Certainly a little bit of a street port (see Mazdatrix 6 port templates) is usually a decent idea if the engine is already going to come apart. But is it worth spending $3000 for a tear down, port and rebuild for 15 - 20HP?