Supercharged 2zz engine build

Gcxrs05 · Mar 22, 2009

I need some advice from you guys. I have a Greddy supercharger with CAI & Exhaust and I'm going to build my motor in order to up the boost. I'm currently maxing out at 10psi with the stock pulley (yea I know it high but it is what it is) MWR suggested to upgrade the pistons before going to the 3.1" NTS pulley. So I figured since I'm going to get the pistons I'm also going to get one of their built head as well. Now this is my question, Should I get the stock compression 11:5 or 10:5 Mahle pistons and also should I get the port job on the head? The port job is an extra $600 but is it worth it? I wanted to get the 11:5 stock comp. because the max psi I'll see is probably 12-13 and I'm also going to get an intercooler either from VF or the one Exotic is going to be working on if that happens. So will this be safe or should I just go for the 10:5 and loss a little hp for safety? Also, I may have to save to get the intercooler would running water/meth be ok for the mean while? and FYI Monkeywrench will be doing all the work. Thanks in advance your comment are greatly appreciated.

GoatOfRafin · Mar 23, 2009

Gcxrs05 said:
I'm currently maxing out at 10psi with the stock pulley (yea I know it high but it is what it is) MWR suggested to upgrade the pistons before going to the 3.1" NTS pulley.

Well, I don't think that with proper tuning you need any upgrade to the pistons for the 3.1". However, I think that this is the limit for the GReddy setup (ESPECIALLY if not intercooled).

Gcxrs05 said:
So I figured since I'm going to get the pistons I'm also going to get one of their built head as well. Now this is my question, Should I get the stock compression 11:5 or 10:5 Mahle pistons and also should I get the port job on the head? The port job is an extra $600 but is it worth it?

If you are on the process of rebuilding and you are going for the VF intercooler, I would suggest that you go for the 10.5:1 pistons so that in the future (or even now!) go for a 2.6" pulley. That way, you will get lots of hp while being safe knock-wise due to lower compression and temperatures. Also, keep in mind that going to 10.5:1 compression will cost you something like 6-7whp which is small considering the added safety. On the other hand, if you are planning to go for the 2.9" pulley (ALWAYS along with being intercooled), you could be equally safe with the 11.5:1 Mahles (not the stock ones!). As far as porting is concerned, I think you should go for it if you have the money. I cannot tell you if the $$$ are worth the hps you are going to get but there is surely going to be a difference.

Gcxrs05 · Mar 24, 2009

Thanks, GoatofRafin I guess I'll go for the 10:5. Does anyone else have any input on this?

StraightXrs · Mar 24, 2009

If I were doing it I wouldnt go any lower than 11:1. I would probably get them at stock compression. Unless your going to add nitrous as well I say go with stock compression. How much is mwr going to charge to install the pistons? Thought about ordering a set but if install is going to be $1500 plus I think I will just stay on the south side of 270whp for now.

jlitman · Mar 24, 2009

So far, we know of one guy with forged pistons at stock CR running a decent amount of boost without breaking anything... is he an exception or the new rule? No one knows. It's mostly uncharted waters.

Boosted2.0 once gave a really nice explanation on why it's easier to quench det on lower comp pistons -- I beleive the short version is that the flame front is harder to control with the higher crown of a high CR piston, but someone may correct me on that...

Anyway, I'd say go with 10.5 for added safety and just run more boost. Once you have an intercooler, you can go to a 2.5" pulley and drive the blower at a 2:1 ratio if you want, just like the ronin, me, and the Lotus racing team... :burnout:

Supercharged 2zz engine build

Gcxrs05

GoatOfRafin

Gcxrs05

StraightXrs

jlitman

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