Another quick question=(2g pistons n compression)

[nightspeed87]

does how low you shave your heads and what type of gasket you use have anything to do with outcome compression ?

And in case I need new pistons in my 6bolt motor swap, would one think I should get 2g pistons for the extra comp? But wouldnt fabrication to the rods be required to pull that off? Any advice from experienced 6bolters with 2g pistons?

( I dont plan on ever running over 20lbs of boost so I figure why not have 2g pistons because I wont need to do any crazy tunning. I understand they are just as physically durable as the lower comp 1g pistons by the way am I correct.... )

 

[olmytsi]

Yes, those affect compression.

The 6 bolt rods with 2g pistons combo is very common, i have that setup in my car. Yes machining is required.

 

[nightspeed87]

Yes, those affect compression.

The 6 bolt rods with 2g pistons combo is very common, i have that setup in my car. Yes machining is required.

Yea im considering doing that... Does the car feel more responsive or anything with the added compression from 2g pistons, and would you consider it worth doing? Id imagen itd be worth maybe 5 to 10 hp considering the 2g is rated at 210hp over the 1gs 195.
And my shaving heads and putting like a mls gasket is that lowering compression, or raising it?

When you got your 6bolt rods machined to the 2g pistons was it a easy deal or was it something that takes time to do which makes it expensive?

 

[olmytsi]

I can't tell you the difference since i went from a 2g 7 bolt to a 6 bolt with 2g pistons. That's a good question for the 1g guys.

 

[JayRolla]

Im running 2g pistons and I cant really notice the difference. Maybe spool a little faster and have a little more off boost power. Where you get the power is when you add boost to high compression pistons. The 2g's are 8.5:1 which I believe is the sweet spot in these cars. The only problem is you get more knock with higher compression. So you may have to run lower boost but if tuned correctly you can make some good hp #'s with higher compression. I know somebody that put N/A pisons 9.1:1 I think and his car layed down some good #'s. I think its a little high for a turbo car but the car has some more power in the lower rpm's.

 

[andymoraitis]

Jay has a really good point. The 1G ECU has a much more agressive timing map than the 2G due to the lower compression (7.8:1 vs. 8.5:1). If you have a large turbo that doesn't heat the air intake charge badly, this should be a huge issue, but on the smaller turbos, it can be a pain.

You can tune around this with Link or a custom tuned EPROM chip, so don't let it dissuade you from going to a higher compression ratio although it may reduce the amount of boost you can run on pump gas by a small margin. I know I've said this before, but if I could run 10:1 on a 2.3 with an FP Green at 20psi on 12 degrees of advance and pump gas, I'd probably pee myself at how much fun that combo would be.

Good luck,

Andy

 

[nightspeed87]

i think anybody would if possible... well anyways I didnt plan on running more than like 20 lbs of boost anyways, thats why I was thinking maybe I should go higher comp while Im about to be in there, but then I was thinking I know its not a direct swap so I dont want to spend the extra money for it of the little money I have if it wasnt going to even feel like a mod? And how hard is it to tune around? Does this affect gas milage significantly any?
I dont know maybe ill stay with the 1gs pistons, but the 2gs pistons do seem to be idle, and as long as im under 20lbs it shouldnt be that hard to tune since I know 2gs do it all the time easily after they upgrade their turbos? But then you speak of 1gs with more aggressive timing maps how does this effect the 2g comp ratio with 1g maps/? Any opinion on that?