10psi making 350whp on the stock gasket and arp studs. there are eclipse guys making the same or more on the stock gasket. like what was said earlier its all in the prep of the head and block
10psi making 350whp on the stock gasket and arp studs. there are eclipse guys making the same or more on the stock gasket. like what was said earlier its all in the prep of the head and block
Brandon - 2001 Galant GST 5speed
Wiseco // Eagle // PTE // Holset // Turbonetics // Supertech // Blox // Prosport // Vibrant // Innovate // OpenEcu // Mishimoto // Magnaflow // Walbro // XXR // Rotora // Brembo // Hawk // R1 Concepts // Dc Sports
The stock gasket will fail with repeated abuse. The DSM's came stock with a composite head gasket just like the 4G64 but they dont go the distance in terms of longevity and power. You can make 350whp on it fine as long as the tune is solid and safe, but the question is how long. The composite gasket also tends to deform more with higher torque loads. I know most guys using L19 head studs are torquing them down to at least 95lb-ft regardless of what ARP recommends. Try doing that with a composite gasket, the results wont be good. The other issue is knock resistance. You may be able to have a few counts of knock here and there while tuning the car closer to the edge, a composite gasket wont like that at all. Typically they fail at the coolant passages and the car will start to push coolant, ask any 7-bolt DSM owner and they will confirm it.
99' Galant ESOriginally Posted by qnz
4G64/63T
AEM EMS
In addition to this, Goosey's car was making 300ish whp running 15-18psi on a EVO turbo, using a junkyard 4G64 motor with 130k miles, using a stock head gasket and stock head bolts, im pretty sure he got the better part of about 30k miles or more out of that setup. The key here is his car was never pushed too far tune wise. It was pretty conservative on timing and a little on the rich side for AFR, it was SAFE.
99' Galant ESOriginally Posted by qnz
4G64/63T
AEM EMS
wait i thought the stock head gaskets were multi layered steel?
Last edited by underated; 03-27-2012 at 12:08 AM
Brandon - 2001 Galant GST 5speed
Wiseco // Eagle // PTE // Holset // Turbonetics // Supertech // Blox // Prosport // Vibrant // Innovate // OpenEcu // Mishimoto // Magnaflow // Walbro // XXR // Rotora // Brembo // Hawk // R1 Concepts // Dc Sports
The stock EVO head gasket is MLS, the STOCK OEM 4G64 gasket is composite. Some of the aftermarket replacement gaskets such as the Felpro and APEX are MLS. Im not sure if Mitsu started using a MLS gasket in later 4G64 models (like after 2003) I know for sure my 99' stock engine had a composite gasket as did the 02' engine that I took apart for my donor block.
99' Galant ESOriginally Posted by qnz
4G64/63T
AEM EMS
I just did some re-search, turns out all the aftermarket ones are MLS. It also looks like Mitsu we with MLS on some 03' models and began using them full time on 04+ models. I would imagine they did this for cost savings, they had to make the MLS gaskets for the EVO anyway, for the 64' they just needed to open up the bores by a few mm's. Cheaper than making two different gaskets out of two different materials.
99' Galant ESOriginally Posted by qnz
4G64/63T
AEM EMS
99' Galant ESOriginally Posted by qnz
4G64/63T
AEM EMS
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