1994 Corolla 1.6L - engine and transmission

[Sven]

Hey all,

I drive a 1994 Corolla "Special" 5-spd and have been reading around quite a bit but can't seem to find accurate information for my car.


1) What engine do I have? I'm assuming the 4A-FE 1.6L with 105bhp

2) What transmission do I have?

I'm trying to find out the gear ratios so I can calculate approx. how fast my engine's turning overat various speeds since I don't have a tach.

When I'm going 150-160km/h it sounds like it's screaming and I'd like to know if I"m near-redlining or not -- I don't wanna kill the thing.

p.s. if anyone's installed the instrument cluster for the 1.8L SE or whatever into their "Special" could you let me know? A guy at the wreckers nearby said as long as I have a fuse for it, and a lead coming off the engine I could just replace it and finally have a tach.

Thanks,

A.

[94_Rolla_Guy]

At 160 km/h your doing 4300 rpm, its not a M3 slow down! you are gonna kill it!

try 110 @ 3000 i wouldn't go beyond 130 @ 3600 for any length of time


4A-FE uses a C50 while 7A-FE uses a C52

your ratios are

1st 3.545 7afe 1st 3.166 ****otherwise the same
2nd 1.904
3rd 1.310
4th 0.969
5th 0.815

Diff 3.722

As for the engine check the emissions sticker under the hood or look on the front right of the engine block, (right up against the tranny) about halfway down theres a flatspot that will give ya the real block code (7a / 4a)

Yes the tach cluster is plug and play all the wiring is there, 2 things to consider
- some people mistrust the fuel guage as for some people it seems to be worng !?!?
- mileage will be different then your current odometer

[Sven]

hehe thanks for the reply man.

Nah that's not my average speed but it just tends to happen in quick bursts trying to get around people. I'd say average highway speed is 125-130kmh.

I'm assuming the redline is somewhere around 6,200rpm?


Another thing: what is the proper calculation to obtain rpm from the ratios?

I know I need tire size for the calculation, where I believe my overal diameter is 22.95 inches (175/65R14's).

[4Aaron GE]

Are you the guy with the JDM headlights? Apparently somone in town has a set on a beigeish Corolla.

edit: btw, I'm told that the cluster should just swap over fine. Some of the Corollacustomz guys would know better.

[94_Rolla_Guy]

***Preliminary***
175 65/R14 = 58.4 cm (dia) get this off a tire manufactures site as i donno how to calc it!!

58.4 X 3.1415(pi) = 183.52cm (circumference)

100cm = 1 m , 1000 m = 1 km therefore 100000cm = 1km

100000 / 183.52 = 544 turns/KM (magic tire #)


*** Speed to RPM***

speed (120) * 544 (magic tire #)= 65280 RPH

65280 / 60(constant DIV'er) = 1088 RPM (CV shaft)

1088 * 3.722(differential ratio) = 4049 RPM (countershaft)

4049 * .815(gear ratio, can be any gear) = 3300 RPM theres the engine


***RPM to Speed***

3300 RPM (engine) / .815 (Gear ratio) = 4049 RPM (countershaft)

4049 RPM / 3.722 (differential ratio) = 1088 RPM (CV shaft)

1088 RPM * 60 (constant X'er) 65280

65280 / 544 (magic tire #) = 120 km/h


i didn't bother carrying decimals as i don't care that the cars going 67.823245534km/h

This isn't so hard you get used to it fast after a couple times and it works with every tire and trans and engine!

[REN69]

LOL! the 4AGE runs about 4000RPM at 120km/h I think I hit about 5000+RPM at 160km/h, there's nothing wrong with 4300RPM at 160km/h. My regular speeds on the Highway are about 120-140km/h.

As for what engine you got, look under the hood.. there's a sticker in the inside of the hood that says what size your motor is. 1.6L = 4AFE and 1.8L = 7AFE.

[Sven]

Nope, mine's white and I haven't done anything to the headlights besides replacing the bulbs.

94_Rolla_Guy - thanks for those formulas. I put all those calculations in a sweet Excel table so I can determine rpm for any speed in any gear.

The problem is that using those formulas it seems like I won't hit my redline until ~228km/h which is somewhat unbelievable for a Corolla (also since the speedo only goes to 220km/h which is usually not attainable by economy cars).

Also, although as it seems like the engine's screaming at 160km/h it's only apparently going at 4400rpm -- not sure i agree with that as it sounds like it's above 5k.

[4Aaron GE]

Where did you get a speedo that goes to 220?? My brother's only shows up to 180.

[Sven]

lol - sorry my bad I was thinkin about another car.

Makes even more sense if the speedo only goes to 180 I doubt the car could get over that even, nevermind 200kmh.

Edit

Just checked out my tires on the Michelin website:

Michelin Harmony 175/65R14

Diameter (in.) = 22.9 (58.17cm)
Revolutions/mile = 908 (564 r/km)

With these calculations added in, seems like I'm going just above 4,550 at 160kmh... a little more believable but still seems low for some reason, though it'd be great if it's accurate!

[punter]

Originally Posted by Sven

lWith these calculations added in, seems like I'm going just above 4,550 at 160kmh... a little more believable but still seems low for some reason, though it'd be great if it's accurate!

No that sounds about right, in my 4afe ae101 trueno I couldn't get into top on the track, 4th gear got me just past 180 (indicated speed) at about 6500rpm, so 4,550rmp for 160 in 5th sounds good.

(and yes mine runs a c50 to)

[Sven]

So punter the car is limited to just over 180km/h then?

It's just weird that there's only 1500rpm difference between 120km/h and 175km/h for such a little engine. I don't find 5th gear to be THAT tall.

[punter]

Originally Posted by Sven

So punter the car is limited to just over 180km/h then?

It's just weird that there's only 1500rpm difference between 120km/h and 175km/h for such a little engine. I don't find 5th gear to be THAT tall.

No I didn't hit the speed limiter, I ran out of straight

Remember that the speedo isn't that accurate and always reads fast.

If you don't believe me check with a handheld GPS, (and yes on standard wheel sizes)

[Sven]

dayam.... sorry man no disrespect, I just picture the Corolla as the uber-economy car (a step up from the Echo mind you!) so I can't picture it getting to 180km/h and STILL having an extra 1000rpm+ to go!

If that's the case then I'm all good - I've never gone above 165km/h in this car anyway - it's bone stock.

[94_Rolla_Guy]

thats wierd because my speed limiter kicks in at 173km/h. as for the math provided it seems to be accurate for me, but that does sound funny about not redlining till 228km/h i doubt a rolla would go that fast

[punter]

Well i've done one top speed run, with speedo disconnected, was clocked at 194kmh, car might have a bit more but i would need a really really long straight.

Hmm can't wait to get my 20v goin again.