Ok I know generally speaking boost and high compression pistons don't mix. However, while normally the compression is 9.5:1 mine is 10:1. So my question is whether this would be a problem. Would it be worth picking up a decompression gasket to run a RRM stage 1 intercooled turbo kit?

 

Decompression gasket - damn good idea.
No decompression gasket - just don't go nuts with the boost.

To be honest, Lancers don't have good compression for boost anyhow. Ideally you want to run 8.0 or so. So getting the decomp gasket would really help you out. And with the forged pistons, you're already safer (at least in the piston dept.).

 

I was bothering Boeturbolancer with this question for a while. He told me that high compression and boost is fine as long as you will tune it right. At 7 psi you would have to retard the timing but you would still have more whp than lancer with stock compression at 7 psi.

 

Just be careful if you don't go with the de-gasket.

 

Yeah I probably will (hopefully) go with the decompression gasket, at least I'll have forged pistons though.

 

Probably the best choice.

 

Too much work, a razor thin margin for error.

What are the odds of someone correctly getting the fuel curve right out of bat?

The Evo 3 has a 9.0:1 CR while DSM kits goes as high as 8.8:1 as absolute max.

There were FTO and G92 MIVEC turbos out in the world . . . the long term durability of those cars are unknown . . . 3-4 months of internet popularity before disappearing off the face of the earth. They probably faced some engine damage and gave up on the project.

Look at PJ and his trials and tribulation. He's probably making a second car payment from his rehauling bills.

 

OK I decided to bring this back from the dead rather than start a new thread. I talked to Rob at RRM today and we came up with an idea. Rather than go with a decompression gasket I'm going to run about 5-5.8 PSI and use a RRM piggyback to tune the car. If all goes well I'll have good off boost power thanks to the pistons and great on boost power thanks to the turbo. Eventually I might upgrade to a stage 2 package and have a real monster.

 

my tt runs 9.5:1 C/R. The higher the comp the quicker the turbo will spool and also more power throughout the powerband. If you run 93 oct and have a decent tune you will be fine.

Plus how many other cars on this forum have decreased comp. Not many from what ive seen. I know i didnt and never worried about it on my oz.

 

I know you have the forged pistons, but how about rods? One bit of denotation at WOT and you'll bend or throw a rod... Be very careful on boost! That's all I can say...

 

I don't have upgraded rods, that's one of the things I regret not doing while I had my engine rebuilt.

 

I was reading somewhere that those decomp gaskets from RPW are only rated up to 18psi because they are some carbon composite or something. Can anyone confirm this?

 

I think that's right but I'm not 100% sure. Realistically most people will never get close to 18 psi.

 

Decomp gasket just to be safe. If not, like RRM said, drop the boost, keep the compression, monitor everything like crazy, and have a conservative tune.

 

Is this your DD? If so, I wouldn't skimp on "boost security" mods like the decompression gasket and an excellent tune... Just me, but I'd hate to have to "baby" my car knowing that if just by chance the wastegate line pops off at WOT and you hit 10+ psi by accident that you wouldn't be another Lancer on the back of a flatbed. Saw one today...