well I have a high compression ls/vtec with ctr's in it right now, and am swaping it into a 88 rex. I was thinking turbo for some extra ponys this summer. You guys think that I could get away with 6 psi on kinda a budget. I have dsm 390's running it right. I am thinking about those and fmic running crome. and 93 oct. Will this be too much pressure for the ring lands, even with a conservitive tune? and are 390's big enough on only 6 psi?

 

My answer would be...VERY CONSERVATIVE TUNE...I'm sure you can make it live, but your tuning will have to be really good.

 

you know as well as i do shane, its all in the tune. Tune conservatively and youll be just fine. Youll have to take out alot of ignition timing to compensate for street gas with your high compression... what is it, 12:1? Colder plugs is a big part of this too

 

6psi would suck your going to want more

 

If you are worried about your ring lands, you could invest in a Cometic head gasket that will lower the compression into a more boost-friendly range.

 

oh I know that I will want more lol no doubt about that. but I don't think that over 12:1 cr will take much more on pump gas or even race for that matter. I saw the gsr with ctr's that jeff blew up on 8psi and it worried me a bit

 

bump

 

That sounds like the best route along with some really conservative timing.How much can you drop it with a super thick headgasket?

 

i think the cosmetic brings it down 1 full point

 

https://www.homemadeturbo.com/forum/...?topic=51336.0

Jeff and the CTR pistons that shouldn't have been there. 8psi, two pulls, 4 dead pistons.