I want to know what it takes to get turbo pistons, rods and put them into the 7 rib big port block.

Then turbo kit, injectors and run a stand alone like mega squirt with map, coil packs, knock sensors etc.

I need to know if the rod journals are the same on the pig port 1987 7 rib motor and if it has oil squirters or only the gze blocks have them.

This is going into an 1985 ae86.

4AGE-FTW wrote:I want to know what it takes to get turbo pistons, rods and put them into the 7 rib big port block.

Then turbo kit, injectors and run a stand alone like mega squirt with map, coil packs, knock sensors etc.

I need to know if the rod journals are the same on the pig port 1987 7 rib motor and if it has oil squirters or only the gze blocks have them.

This is going into an 1985 ae86.

Some 87s have been known to have 18/42 rotating assembly in 7 rib blocks so you will want to make sure you have the later 20/42 rotating assembly. If so then the only difference is the pistons. Everything else in the bottom end is the same between 7 rib NA and GZE.
My question for you is if GZE pistons are the best option which in my opinion rarely they are. The compression is too low for any mild to moderate build.
What are your goals? What is your budget? What are your plans?
Largeport GZEs did not have squirters. Some smallports didn't have squirters. They are in no way a requirement for running boost or making high power.

yoshimitsuspeed wrote:Some 87s have been known to have 18/42 rotating assembly in 7 rib blocks so you will want to make sure you have the later 20/42 rotating assembly. If so then the only difference is the pistons. Everything else in the bottom end is the same between 7 rib NA and GZE.
My question for you is if GZE pistons are the best option which in my opinion rarely they are. The compression is too low for any mild to moderate build.
What are your goals? What is your budget? What are your plans?
Largeport GZEs did not have squirters. Some smallports didn't have squirters. They are in no way a requirement for running boost or making high power.

Im looking to make about 200hp, budget is as cheap as possible (ebay cast mani, junkyard turbo, used ecu, gm map sensor etc).

How can I find out what rotating assy I have? Do I have to drop the pan?

Also since its such a low comp engine, isn't it possible to use the stock pistons?

4AGE-FTW wrote:

yoshimitsuspeed wrote:Some 87s have been known to have 18/42 rotating assembly in 7 rib blocks so you will want to make sure you have the later 20/42 rotating assembly. If so then the only difference is the pistons. Everything else in the bottom end is the same between 7 rib NA and GZE.
My question for you is if GZE pistons are the best option which in my opinion rarely they are. The compression is too low for any mild to moderate build.
What are your goals? What is your budget? What are your plans?
Largeport GZEs did not have squirters. Some smallports didn't have squirters. They are in no way a requirement for running boost or making high power.

Im looking to make about 200hp, budget is as cheap as possible (ebay cast mani, junkyard turbo, used ecu, gm map sensor etc).

How can I find out what rotating assy I have? Do I have to drop the pan?

Also since its such a low comp engine, isn't it possible to use the stock pistons?

You might find some useful info here.
http://matrixgarage.com/content/yoshimi ... oing-4a-ge

You can boost on NA pistons. The biggest downside is that the pistons are very weak leaving you fairly narrow margin for error. For 150 WHP I wouldn't worry about it too much. For more than that I would really start looking at upgrading. If you are going to see what you can get out of a healthy motor I say go for it and see what you can get out of the stock pistons. If you can't risk blowing it up keep it mild. If you don't care then start learning where the limits are.

For the budget remember that going too cheap will greatly start to sacrifice performance, quality, longevity and or efficiency.
For example if you went with NA pistons they would be easier to break via detonation, running lean or cylinder pressures getting too high. Almost always caused by detonation. You still have to worry about all those things with a stronger piston but they will give you a little more margin for error.
On the flip side GZE pistons between being pretty strong and very low compression would give you a very big margin for error at the cost of efficiency. It will take a lot of boost to make power. More boost means more heat, bigger intercoolers etc Gas mileage won't be great and so on.
High compression low to moderate boost are my favorite builds. For example if it takes 15 PSI to make 200 CHP on GZE pistons and stock cams instead you could build a motor with 10.5:1 compression and a small cam. This motor would probably need about 8 PSI to make that same 200 CHP but with lower boost means cooler intake temps. It also means you can run a smaller turbo which means you will spool sooner, have a broader power curve and more overall power. It would also significantly improve your gas mileage. Going from my GZE longblock running 12 PSI to my blacktop running 7 PSI the car does 0-60 a second or so faster and I also went from about 22 city, 28 highway to about 28 city, 34 highway.
Efficiency is much higher but again the margin for error is narrower.

Hey Yoshi! Can you get me a set of those stock 18/42 con rods? Stock? Heehe

Seriously though. If you are considering turboing your engine you might consider going with the engine you have as a learning tool. If you make a mistake in your tuning it won't be as bad as blowing up a fresh engine. Put the parts on, iron out any issues, get a feel for it. While you're schooling yourself on the ins and outs of forced induction you can be working on the engine you want. Then you can push the limits of the stock block before you install your fresh block! Invite your friends over! Melt a couple of pistons!

sirdeuce wrote:Hey Yoshi! Can you get me a set of those stock 18/42 con rods? Stock? Heehe

Lol it too me a min to figure out what you were talking about.
I meant 18/40

Fun with typos!

I found a thread on a guy boosting a stock big port on 8psi while using the stock ecu and 7mgte injectors oh also fmu etc. I do have an fmu 12:1 sitting on my desk (was gonna use it for a miata turbo project) and now I might use it on the 4age build.

http://forums.club4ag.com/zerothread?id=982