MX-83, 7MGTE or 7mge-T? anyone here done a 7m NA-T?

[cmdeshon]

yesterday i picked up an MX83 cressida hard-top with a BHG for $500. i am thinking about trying to boost it with all the extra stuff i have lying around from my MK-II 7m swap. i cant decide how i want to go about it.

i have an extra 7m-gte engine just chilling out in the garage. i feel like i should probably use it and do a legitimate GTE swap but i am having some trouble finding information on the wiring. does anybody on here know about the wiring for this swap? Wondering how similar the under-dash plugs are. also wondering if the ignition system is going to be tricky (coil/igniter are on the passenger side of the engine bay)

i am leaving it automatic so the trans shouldn't be an issue with the project.

the other route i am considering. Anybody done a 7MGE-T before? i was thinking about just boosting up the stock high-compression GE motor with an RRFPR. this would just be a stock ct-26 at stock boost levels, nothing to crazy. Would that work? what kind of problems could i expect if i take that route? i know i would have to deal with the oil feed/return lines but im going to be pulling the motor to do a headgasket anyways so i could tap them then. Is it safe to boost a car with just an RRFPR? or would i still need a fuel computer on top of that? i also have an adjustable FPR. i dont know if that would make a difference or not.

Does anybody know the mods on the cressidaforums? i want to sign up but the registration is locked. i cant make an account over there.

[Suprasaurus]

I'm not a huge fan of the mx83's, I used to have a mx73 however and I loved it.

I think projects like these always look appealing at first and turn out to be more money than you originally predict, but then again... I could be wrong. I've kicked around similar ideas two or three times and after making a list and doing the numbers, it was more than I wanted to spend on a second project car. But, I'm not trying to discourage, just make a list first and do the numbers.

I don't know a whole lot about turbo'ing a 7mge, but since it's something like 0.2 or 0.3 compression more (I think the gte's are 8.9 and the ge's are 9.1), it should make more power. However, I wouldn't run more than 10-12 psi through a ge because of the compression (I'm not 100% sure why this is, but I've heard multiple people talk about wanting lower compression when building a turbo car. I can see the benefits, but the "what if" question is, what if I'm only planning on running 10psi?). I think if you read through the mkII 7mgte swap rewire and get the pinouts for the cressida, you can most likely connect the dots and/or talk to someone who has done a write up and see if they can assist you. As for the AFR's, I'm not sure whether a higher compression engine would effect the stock 7mgte's tune (I don't think it would, a ratio is a ratio, regardless of the space). I imagine you could run a stock 7mgte fuel system (might need a better fuel pump and a rrfpr depending on what amount of boost you run, but I'm not sure... I've always had one).

I joined one of the cressida forums back when I had my mx73. IMO they're not very friendly and there's not a whole lot of useful information on that forum; hopefully you'll have a better experience.

Anyhow, good luck!

[alfun]

Does anybody know the mods on the cressidaforums? i want to sign up but the registration is locked. i cant make an account over there.

Which Cressida forum are you referring to? There's JZXproject.com that might have some MX83 information.

[cmdeshon]

i dont think i am going to get a lot of support for a 7m swap on a "JZ" forum. i was trying to register at toyotacressida.net but it is locked.

i figured i would get good feedback on how to boost an NA engine with an rrfpr here because of all of the people who turbo their 5m's. i guess these days everybody uses an MS on them though.

i was thinking about just bolting a stock turbo and exhaust manifold on the GE with an upgraded fuel pump, an RRFPR and an adjustable FPR.

i have a lot leftover from my mk-II 7m swap.
ARP headbolts
Cartech RRFPR
Aeromotive FPR
intercooler W/pipes
ct-26 W/ 7mgte manifold.

lots of odds and ends including a whole nether 7mgte, 7mgte head, 6m crank. LOTS of new gaskets, seals, belts. i feel like i probably have most of a cressida turbo kit lying around here. maybe not a whole one and certainly not a big one. not sure how i feel about an RRFPR instead of a computer though... seams kinda sketchy.

Just research for now. i have to get my 83P finished before i tare into the cressy. feels good to be a Cressalot again! i used to have an mx-73 (my first car!) and i really liked it.

[Donn29]

RRFPR is quite getho I'd say. Make sure you have a wideband at the very least. And it really limits how many pounds you can run. There are lots of rrfpr threads on this forum. I read pretty much all of them and still melted pistons on 2 5M's. Mostly do to boost creep, as I didn't have an exhuast and had to back off the throttle to bring the boost down. Compounding the issue is that the timing gets advanced when you are part throttle, bad for your pistons.

I'd suggest going with proper GTE electronics. A stock 7M can make up to 350-400whp with a lexus/550(or 440's and the fuel pressure turned up to 55psi) and MBC. No piggy backs at all.

[EwGoetsch]

jzxproject forum is full of cocky ass mofo's.

[cmdeshon]

that is why doing an rrfpr on a GE appealed to me. i would get the torque and bottom end of an N/A with the passing power of a turbo car right? when i said "not looking for a rocket ship" i meant it (got a 7mgte mk2 for that) i think a high compression 7m running 5psi would be pretty spanky! and it sounds pretty easy....

as far as what you said about "boost creep" i was actually thinking about running the stock GTE exhaust elbow with like 2.25 exhaust to help assure that i can actually stay at 5psi. and save a buck.... lol.

i need to fix the BHG and get it to run first... think i am going to do it though. if it pops i still have an extra 7m.

[cmdeshon]

and yes, if i do it i will barrow the wideband off of my supra

[Push]

7mge-T is meh a waste of time... Try signing up to www.toyotacressida.net it takes a couple days for your registration to be active. Make sure you post an intro with pics. Goodluck..

[canadianmx73]

Why do you want to turbo a na 7m, you'll blow the hg twice as fast as a 7mgte. Also RRFPR is a ridiculously stupid way to control fuel for the addition of a turbo. At least get some sort of fuel and spark management if you are going to turbo anything, or just use a rrfpr and blow up your motor at a waste of time 6psi.