7mge vs. 7mgte Block

curkis535 · 02-04-2011, 04:12 AM

ok, so i have an 89 cressida that came with a 7mge that i want to put a 7mgte in. as far as blocks is there a difference? and are the heads interchangeable? and as far as the redline change on the crank balencing, is it an increse or a drop? and will that change fuel cut or no?

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!

btwilson86 · 02-04-2011, 04:06 PM

If you put a GTE in your Cressida, then you need to run GTE electronics. Period.

As for some of your questions, the redline dropped after 89 by about 250RPMs. The N/A cams in a Turbo engine give a little more low end power, but suffer in the high end. Most people have determined it's better to keep the turbo cams (wonder why Toyota did it?). Block differences are as mentioned, including turbo block has 2 knock sensors whereas GE has 1, also the oil ports are already drilled for feed and return lines.

Have you searched the forum? I think I've seen about 10 threads within the last 2 weeks asking about GTE vs GE block differences, where this question has been answered several times.

Sonyps307 · 02-04-2011, 11:35 PM

The GE pistons are dished also. The turbo pistons have a deeper dish Then the NA pistons

02-04-2011, 04:12 AM	#1
curkis535 Stock Join Date: Feb 2011 Location: portland oregon Posts: 1	7mge vs 7mgte ok, so i have an 89 cressida that came with a 7mge that i want to put a 7mgte in. as far as blocks is there a difference? and are the heads interchangeable? and as far as the redline change on the crank balencing, is it an increse or a drop? and will that change fuel cut or no?

02-04-2011, 08:03 AM	#2
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.

02-04-2011, 04:06 PM	#3
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	If you put a GTE in your Cressida, then you need to run GTE electronics. Period. As for some of your questions, the redline dropped after 89 by about 250RPMs. The N/A cams in a Turbo engine give a little more low end power, but suffer in the high end. Most people have determined it's better to keep the turbo cams (wonder why Toyota did it?). Block differences are as mentioned, including turbo block has 2 knock sensors whereas GE has 1, also the oil ports are already drilled for feed and return lines. Have you searched the forum? I think I've seen about 10 threads within the last 2 weeks asking about GTE vs GE block differences, where this question has been answered several times. __________________ 1989 7MGTE R154 Targa Top White Package w/Blue Interior Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels

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02-04-2011, 11:35 PM	#4
Sonyps307 Lexus & 550's Join Date: May 2010 Location: Baltimore Posts: 526	The GE pistons are dished also. The turbo pistons have a deeper dish Then the NA pistons