6G Celicas Forums

This is something I've always wondered about...

Shouldnt we be achieving the best mpg when the engine is at the lowest possible rpms while in the highest gear without bogging the engine?

For example cruising at 40 - 45 mph in 5th gear I'm guessing is around 1.5k rpm and should in theory be burning less fuel per mile than it would at 55 mph at 2k rpm?

I have one buddy that insist that no that's not true but at least with my current understanding of how EFI works it makes sense to me and that the 55mph speed limit is actually pretty arbitrary and a generic 'efficiency point'.

Anyone want to correct / verify this?

I know it's super easy to search, but honestly folks we're a community. Some people may be first time users of a forum here and wont know any better I believe we want to have a friendly atmosphere.

Pretty much yup, if you have the tools, and some know how it may be worth it. You may want to do a light rebuild on that 5sfe though, new timing belt / water pump seals etc couldn't hurt. but i guess it really depends on how long you plan on having it in there. Generally my rule of thumb is if i'm gonna have the motor out and can work on it, I may as well do the little things that help keep it running a bit longer (even If i plan on pulling it again soon)

It's definitely doable. I believe several of the engine mounts are different for the S family motor. From what I can tell, the front mount, driver side mount, and passenger side mount all use different brackets and insulators, while It appears that the rear mount may use the same insulator yet a different bracket. In order to get it done you'll probably have to have some fabricating / welding done but it's definitely not impossible. I know i have read about ST guys swapping in a 3sgte before so it should definitely be possible to swap in a 5sfe as well.

However, if you are gonna go through with all the trouble of swapping out the motor on a car why not just put the motor you want in it anyway? The 5sfe isn't much better than the 7afe in terms of performance and really with the time and effort it requires for a swap you kind of may as well just not waste time and throw the big daddy 3sgte in there.

Don't forget that once you get the engine mechanically installed that It's still got to be wired correctly, Luckily that will be pretty easy for since you'd have a donor engine harness as well as reliable technical diagrams that are actually accurate. Since you're currently an automatic you'll also HAVE to swap to manual to use that engine / tranny, either that or find an automatic 5sfe tranny because I am 90% sure the auto 7afe tranny will not bolt to a 5sfe.

In summation: Yes, you can swap from 7afe to 5sfe, It's doable and the parts are out there and attainable.

Is it worth it?: No, unless you plan on doing all or most of the work yourself the labor cost are high and the gains are low, this is why when I've read about this in the past people usually just swap to a 3sgte. This would be an awful lot of work to install a low power motor that already has fairly high mileage even when you're doing it yourself.

The 'Butt' dyno isn't really sensitive enough to feel an increase of 2 or 3 hp. Depending upon your application / intentions a cold air intake is probably more effective in the long haul so long as it's actually pulling in cold air, but it's really 6 or 1/2 dozen to the other. My guess is that taking air in from the fender is fairly restrictive without modification

Hey folks,

Out of curiousity does anyone know of any ways to bench test a distributor off a 1.8l 7afe engine WITHOUT the engine?

It worked when the motor was pulled but that was a while ago and want to make sure it still works for ebay purposes.

Any thoughts would be great.

-Ryan

I took a guess based upon 'yota 4x4's i've worked on but like I said, I wasnt sure. my bad!

I Believe gt4's have longitudinal mounting of the engine (I'm not sure though), most fwd vehicles have transverse mounting. So this changes how the exhaust and and axles and everything runs. So to sum up, no theres no way in heck you can use the exhaust manifold from a gt4 on your application.. Well, you could but you'd have to hack up the exhaust manifold so much that you'd have to practically build a custom one, and at that point why not just build a custom one.

Well I'm gonna be using megasquirt and spark(edis) w/ my ride which will be full complete control. I've used Apexi S-AFC before on the gze and it worked. To be honest in terms of simplicity you cant beat something like a basic piggy back, but if you're looking for real tunability you'll want something more complex.

I wouldn't recommend megasquirt for the timid or light of heart, you have to build it then set it up yourself. It's a process and a technical one at that. You have to do a lot of reading and research. I have megasquirt set up to do fuel only at the moment, but I'm pretty much all set to control spark as well, all I need is to make a custom triggerwheel and I'm good to go.

The nice thing about The S-AFC was that you can adjust it on the fly VERY easily. The bad thing is it's basically only tricking the ecu into injecting more fuel.

yup, i've seen on numerous forums for hondas subarus etc that people seem to say they are decent. There were some complaints with subaru guys about quality but seemed to be few and far between. Was just wondering if anyone on here had first hand experience with them.

I'm in

Triple:
1) 95st-celica
2) 02bluerolla
3) D_Dawg
4) bseaman_5
5) erahman85
6) D0W0RKS0N
7)chacha *deposit paid*
8)FAQdaWorld
9)
10)

Single:
1) _mikeE
2)Luka
3)bseaman_5
4) chacha *deposit paid*
5)
6)
7)
8)
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Hey folks,

Anyone have any experience with the company F1 Racing on ebay? They sell multiple stage clutches for pretty cheap and so far my search has shown mostly positive results / experiences with them. I'd like however to hear some of your opinions if you have them.

Usually this is the type of thing where you get what you pay for but I may just be willing to give this clutch a shot.

f1 racing stage 3 clutch

Thoughts opinions etc?

Hey fellas, I was cleaning out the garage the other day and found some stuff back from the good ole 7afe days both were in perfect working order before I went and swapped the motor and were pulled from a 1994 Celica ST Coupe with automatic tranny & 7afe

ECU (remembers its from a '94 7afe w/ auto, not cali spec)

Distributor w/ Plugs.

PM if you are interested in either...

Or aim which is the same as my name here.

-Ryan

There are gonna be a lot of variables with that, like tranny being used, mods, which style car you have and other stuff along those lines. To be perfectly honest I don't know any 1/4 times for the 4age but I wouldn't expect blinding fast speeds or anything.

whether or not it's a 7afe or 4afe, they're both slow as hell in any form without a turbo or other fun stuff like that

When I pulled my 4agze pulley i actually threaded two bolts into the pulley (they were there so you can use a pulley puller). I had my mom (she was the only one around at the time lol) hold a pry bar in it using those two bolts and then i went to town with big prybar; Keep in mind that I didn't care what happened to this pulley as i was swapping it out. Since you've already tried something like this though...

Another thought that may work would be to have someone hold the brakes down while its 'in gear'. That should keep the pulley from turning as well and probably a bit more elegant then using brute force to get it done.

Sorry I guess I just glanced at your post before

You can try that with the starter, or you can just try sliding a big pipe over your breaker bar. I remember it was on my 4agze really really tight. You either need an incredibly strong impact wrench or a long breaker bar (use leverage to your advantage).

-Ryan

Just out of curiosity what tranny were you using with that setup, the stock c52?

Sorry to hear about the engine, but you can always do it better, faster stronger!

Not much, I would think that even 6 psi or so would be pushing it. Any more and you'll need to start thinking about water injection , higher octane fuel and such. Those motor's aren't really designed to be turbo'd or force inducted, they're designed for NA power hence the high compression.

Hey folks,

Anyone know what the size of the stock flywheel on a 7afe w/ c52 tranny is? I'm guessing 200mm or maybe 212 but I want to be sure.

Also, do they make any LSD kits for the c52?

This is all going into a swapped 4agze, I've just gotten sick of trying to screw with the e58 tranny and it's damned hard to find axles.

I would also consider swapping to a LSD fwd tranny that is beefier if it has lsd; but for now these will suffice.

(To those that remember me; no, I'm not dead I'm just a forum lurker now)

-Ryan

The headers should be different, You will need an 'F' series header.

Just thought I'd chime in, I'm the other guy w/ a running JDM 4agze into a 6th gen. I dont post a lot anymore these days, at least not here, i spend more of my time on club4ag or just researchin on my own. Congrats on joining the gze community to the owner of the black 6th gen

One of these days I'll take some more pictures / video of the car running. I currently have it all apart again to fix some body issues and a few other things. When its back together I'll have upgraded sc'er boost, larger injectors, fmic, and full standalone. I'll keep you guys posted when all that finally goes down

-FAQ

any limits you wanna impose on us? I mean; saying just that i could say spend 8000 bucks on buildin a new motor, but thats prolly not what ur looking for in terms of a response.

turbonator is the thing that is like a 12volt fan blowing into ur intake right? Yeah dont bother w/ that **** you're running more risk of damaging your motor in my opinion, if one of those fan blades were to break off things could get messy. And its not gonna give you ANY gains imho.

-FAQ

The articles right guys, as trivial as it is it does have an effect upon your alternator, and thus ur rpms. While you're at idle flick on ur lights and watch ur rpms change (slightly), but they do change. The argument need not go any further than that guys. There's no such thing as 'free' electricity it always takes some kind of 'work' being done even if the work is a 'renewable' energy source such as solar or hydroelectric.

-FAQ