Head studs for turbo m20

[AdamF 88iS]

try venolia pistons. tehy have pretty good prices.

True, but they don't have diamond cut sides/skirts like JE, the new Arias, and that other company that just started up in Irvine..I forget their name. Supposedly pretty good, rumor is that all the old JE guys took off when JE got new management and started this new company. Damn I forget thier name.

[DrMcDave]

It's all about having controlled combustion, the original pistons can handle it. At least use a good piggy-back system or replace the entire ECU with something that gives you total control. Use an EGT gauge and wide-band lambda if you really want to have the best power without sacrificing stability. If you didn't understand what I just said, you need to
study. The better the design of the system (wastegate, IC, dump, manifolds) the less boost you have to run to achieve a given power.
In stock form, 1 bar is too much in my opinion.. 0.5 bar (7.25 psi) is not a problem and gives you a healthy power increase, and is what I would run. But if you don't have control over fuel and ignition.. you can destroy any engine with detonation.

The shape of the combustion chamber formed by the M20-head and pistons are not safe for high pressure forced induction and you risk detonation if you increase pressures too much, it needs pistons shaped for forced induction and some head work to decrease the risk. The M50 engine has a better shape in the stock combustion chamber and has less chance of detonation. This is what I've read on swedish racing forums..

ixer that was very helpful, also how is your transfer case and such holding up with that kind of power. I also have an ix if you didnt notice. I think that i will just order the head studs and fix my head. I definitely have a lot of studying to do, i am not in a financial position to do a full turbo right now. I just want to make sure that when i fix my head that its ready for boost when i have all the parts. I'd def. run a fuel management system of some sort. i agree 1 bar is too much boost. .5 bar sound about where i am shooting for. Since my car only has 122k on it there is really no reason for a rebuild.

interesting that you are making as much power as matt with a 2.5 and less boost....i'd like some more information on your setup, sound like its really efficient.

[iXer]

I said it's what I would use, I haven't actually implemented it and I never claimed any exact power increase.. But I know several technically sound turbo E30s. Matts car is a great piece of work, he knows what he's doing. I doubt that I ever will turbo my iX because of the legal ramifications of that modification here in Sweden..

There are some who have turboed their iX:es around here, and they have no problem with the drive line holding up. But no drive line is bullet proof; with no tension in the drive line and then dropping the clutch carelessly with high revs on the engine from stand still, is never a good idea, especially with the iX. The weak point is the front drive shaft splines where it meets the transfer case and the front differential. The splines can be fixed either by extending them (metal shop) or by using washers on the guibo bolts to extend the splines further into the transfer case. The front differential is tricky, I've heard of people replacing the gears with tougher ones to strengthen the setup, but the gears are hard to come by.
The transfer case is quite tough, the chain seems to be the major item that gets worn out (stretched).

[DrMcDave]

okay thats pretty much what i thought, the turbo setup is a ways away. I don't have time to work on it at all, and i need to do more research before i start ordering all the parts. I think i have all the mechanical stuff worked out, i just have to figure out all the tuning and how i am going to do that.