Engine 7a-gze

JDLangevin is the man...how much boost can a 7afte take (stock internals) because you know that i am doing this project, i will be contacting you alot with more questions...do you have an AIM handle?

Wouldn't it make more sense just swapping in the entire 4AGZE engine? the only benefit of having the 7a bottem end is the extra .2L which is IMO pretty insignificant when boosting and when you factor in the problems you 'might' have when using 4AGZE pistons on a 7A bottom end (which you already mentioned). and the necessity of stronger rods (7AFE rods are weaker that 4afe rods, and in turn much weaker than 4agze rods). Paulter offer some btw. Also I believe the 4AGZE crank is stronger. It just boggles my mind as to why would anyone go thru that kind of trouble when they can simply drop in a 4agze which is already built for boost.

i'd get into this conversation seeing how i've done much of what you all are wanting.... but i'm too lazy.... a few answers that i'm going to say (whether they were asked or not

wiring up megasquirt (aftermarket engine management) is easier than trying to go from a 4afe to a 4agze harness....

a 7afte on stock internals can hold just about as much as a 4afe.... less than 15psi... 15psi has been proven to blow at the track

c50/52 tranny in most of the FWD corolla's can only hold about 200hp anyways... find an E58 from a gze japanese corolla... though good luck on the axles

7agze IMO really isn't worth it other than to say you built a 7agze.... just get a 4agze and put some cams in it.... that'll save you money, time, and give you about the same output

a 4afe ecu can run a 4age..... if you learn how to modify the ecu, then you can make teh 4afe ecu rev into 4age land (point in case... my ae92)... the 4afe fuel pump can supply more than enough fuel for a 4age.... the 4age fuel pump can supply enough for a 4agze.... not sure between a 4afe and a 4agze, i've never done it

7a-gze

Ok.... I've read that it's been done. How so? Is the ge head put on the 7fe block? Or is the ge engine bored? I'm getting ideas for a future engine swap, so I'm gathering info. Any would be greatly appreciated.

Most likely the G head is from a 4A-GE engine....the two blocks are pretty similar aside from displacement. Don't know if it's the 20V variety or not....

Trav

It would be the 4agze head put onto a 7afe block. Never seen it done. But then again i've never seen a 7age either.

It's not really any more difficult than a regular 7AGE. The biggest catch is the pistons, you can put the 4AGZE ones in but it hasn't been confirmed whether or not they sit higher, if that's the case then your compression would be too high.

Keep in mind, the 7AFE is a stroked 4AFE, so boring a 4AGZE will not have the same effect. Also, if you thing you are going to run high boost then you better start looking for some custom rods, because the 7AFE are not that great (though they can stand up to quite a bit).

You would use the 4AGZE ECU and wiring, there's no need for aftermarket engine management at that point.

If you have that kind of cash lying around, just rebuild a 4agze with performance parts and install that in your car, much more reliable and will probably more more power reliably.

i know that u can use a 4age or agze head on it....but some other people say that u can use a 20V head to,but i haven't seen it done before....

hookedup96rolla, It's the same difficulty with any engine swap. It's no different than swapping a GZE into a Corolla. Think about it, there is no wiring that goes to the bottom end of an engine (save for oil pressure). Everything goes to the head, pretty much.

teevee247, I agree, unless you really want the extra displacement and have money for better rods, stick with the complete GZE.

corolla_racer, since the 20v is a 4AGE, it works just like the other head swaps.

Ok then.... What about putting a ge head on a 4a-fe block? Or does it not line up right? I think I read somewhere on this forum that it wasn't possible without heavy modification therefore not worth it.

if you want to put a 20v head on a 4afe (or 7afe) that wasn't a 20v before, you'll need the 20v pistons too, since they have indents for the 5 valves (instead of 4)

That would be pointless. The reason they put the GE head on the 7A block is to get the extra .2 liters of displacement. The 4AFE is the same size as a 4AGE put with a weaker bottem end. Just stick with a complete 4AGE.

toyotaspeed90 got most of those questions answered. Most important: tune carefully. 15 psi on 93 octane can be done if it's tuned very carefully, but IMO that's pushing it. I personally wouldn't go any further than 12 at the most, and that is will low compression pistons.

jspexae102, did you not read the whole thread? Look at my post a couple replies up.

toyotaspeed90, do you know what the compression ratio is when the GZE pistons are used in the 4/7AFE?

This is what I was referring to. Just want you to understand that I agree with you, but some people really want those extra .2 liters. BTW that's a good sig, do you autocross at all?

What kinds of problems am I looking at with the harness and axles if I do a 4a-gze swap COMPLETE with trannie?

JDL: oh, sorry bro, i just skimed thru most of the beginning and didnt catch that. My mistake, You obviously know your stuff!

Yea I've been autoXing for about a yr and a half. Running a 7AFE with minor bolt ons. most of the money went towards suspension. I would like to swap a 4agze block myself but cali is anal about engine swaps so I might go into turbocharging the 7A with a custom GT25 turbo setup (turbo off 03 mazdaspeed protege). I really would like to know for sure about the 4agze pistons tho.

i quoted ur first post, and nah i already got the gist of whats going on here.

Wiring is the same as any swap, get diagrams for each car, pull both harnesses, label each wire, and put the two together. Once you label everything it will make sense to you.

The axles I'm not 100% sure on, but you should be able to make something work without too much trouble.


jspexae102, No problem. I wish I had the answer on the GZE pistons for sure. So many people speak of which they know not. If you find out for sure, please get back to me and let me know?

it can be done. if memory serves me right your gonna have to change wires around to fit the new setup. my brother sent me a diagram. if i can find it i'll post it. its in spanish but i'll do my best to translate. translation skillz are ok.

labeling the wiring harness is pointless...... toyota wiring colors are pretty identical between the 4afe, 4age, and 4agze..... including my 90 4afe wiring, ?? 4age smallport wiring, 86/87 4age bigport wiring, ae101 4agze wiring..... all are very very similar... and in fact, when doing my 4agzee swap into the mr2 if i was curious on a wire color i referred to the 4afe wiring harness i my ae92 which is running a 4age

that being said, along with that, the plugs only plug into it's necessary part

heres some info

http://www.users.bigpond.com/vidore...4age_engine.htm

www.club4ag.com

click on tech links

i dunno why you would consider me so familiar with it... i've only done the motorswaps in the ae92 and the aw11.... nothing else really too difficult on other cars yet....

LOL... didn't you just post this:

"labeling the wiring harness is pointless...... toyota wiring colors are pretty identical between the 4afe, 4age, and 4agze..... including my 90 4afe wiring, ?? 4age smallport wiring, 86/87 4age bigport wiring, ae101 4agze wiring..... all are very very similar... and in fact, when doing my 4agzee swap into the mr2 if i was curious on a wire color i referred to the 4afe wiring harness i my ae92 which is running a 4age"

Then you obviously consider yourself to be pretty familiar with it... so I'm not sure what you're trying to say.

Lots are the same, but not all of them. I would label it anyway, it really gives you a good idea of what needs to be done once you see the harnesses all labelled out in front of you.

For a guy like you that's familiar with this, yeah it's no problem.