7mge vs. 7mgte Block

El_supracabra · 02-04-2011, 08:03 AM

Ok, not sure about the whole rpm difference thing. I would think that would be controlled by the ECU and have NOTHING to do with the crank/block/heads. IMO.

However, the ONLY difference (that i am aware of) is the turbo pistons are dished giving it a lower compression ratio (8.5:1??) whereas the NA pistons are flat top w/ valve reliefs and has a compression ratio around 9.2 (those comp rats could be wrong, if somebody knows for sure plz correct) and there are oil squirters under the turbo pistons to keep them cool. Also, as someone else mentioned, the cams on the NA heads are slightly more aggressive, and offer a slight *bolt on* upgrade from the milder turbo cams.

As far as the blown headgasket problem, I recently picked up a "Cometic" multilayered stainless steel gasket, w arp studs. DEF better than the stock graphite w stock bolts. I have heard that all of the "turbo fanboys" are all running cometic or HKS and are pushing 20-30 psi boost through those w/ out blowing them. good luck!

02-04-2011, 08:03 AM	#8
El_supracabra Intake Join Date: Feb 2011 Location: South of Columbus, Ohio Posts: 45	Ok, not sure about the whole rpm difference thing. I would think that would be controlled by the ECU and have NOTHING to do with the crank/block/heads. IMO. However, the ONLY difference (that i am aware of) is the turbo pistons are dished giving it a lower compression ratio (8.5:1??) whereas the NA pistons are flat top w/ valve reliefs and has a compression ratio around 9.2 (those comp rats could be wrong, if somebody knows for sure plz correct) and there are oil squirters under the turbo pistons to keep them cool. Also, as someone else mentioned, the cams on the NA heads are slightly more aggressive, and offer a slight bolt on upgrade from the milder turbo cams. As far as the blown headgasket problem, I recently picked up a "Cometic" multilayered stainless steel gasket, w arp studs. DEF better than the stock graphite w stock bolts. I have heard that all of the "turbo fanboys" are all running cometic or HKS and are pushing 20-30 psi boost through those w/ out blowing them. good luck! __________________ 86.5 Supra NA: milled head .020, decked block .007, .5mm+ pistons, port & polished intake manifold and cyl head,OBX header, 3-angle, cold air intake, Cometic MLS HG. ALL NATURAL! CHEVROLET- Cracked Heads, Every Valve Rattles, Oil Leaks Every Time FORD- Flipped Over, Rebuilt Dodge DODGE- Dirty Old Dust Gathering Engine I'd rather drive a Toyota, than push a ford.