rotary_rx7fc

Hey guys. I'm wondering if an 88 S4 N/A flywheel will work on an 89 N/A auto. I'm swapping the 89 to a manual using the parts from the 88. So I really need to know if the 88 flywheel will work on an 89

lduley

iTrader: (1)

Yes, i do believe you'll be fine, but you'll want to keep the 89 starter due to the fact that i believe the # of teeth between s4 and s5 changed on the starters and flywheels

Another smarty pants who actually knows the answer 100% will respond soon

rotary_rx7fc

So the 88 flywheel will work on my 89 car but I have to use the 89 starter correct?

scathcart

It won't work, 88 (s4) and 89 (s5) had different counterweights on the flywheel.
You'll need an s5.

lduley

iTrader: (1)

*dooh* forgot about the counter weights. My bad

Couple options though, you already have a s5 auto counterweight, could go for a lightweight flywheel

Or just get a s5 flywheel

rotary_rx7fc

Light weights are expensive lol. And I can't find an oem one

rotary_rx7fc

This leads me to my next question. Will the clutch/pressure plate from the 88 work for a lightweight flywheel on the 89?

misterstyx69

iTrader: (142)

That is because they didn't make an OEM lightweight flywheel.
The Flywheels had the counterweight built into the casting,so the Series of engine needs to match the Flywheel is is for..(s4 flywheel,s4 engine).

The Auto "flywheel" is called a Flexplate and needed the counterweight to balance the rotational assembly.,.so then again if you has an S5 engine you would need an S5 Counterweight.

Since the "aftermarket light flywheel" is basically a Auto Flexplate with a Clutch surface,you need the appropriate counterweight for the engine.

NOW,I don't know what transmission you have BUT you will need the N/A starter to run the Flywheel..NOT the Auto trans starter,as they have a different gear.This is on an N/A Manual Trans.
BUT if you switch UP to a TII trans you can use that Auto trans starter on the new Lightweight TII Flywheel..(notice I changed from N/A to TII when I said that.)

psyaddict

my engine had a s5 flywheel, i dont know for sure if that was the case but it may have caused the front key to vibrate off the e-shaft

Banzai-Racing

iTrader: (11)

You need a S5 N/A # 350 flywheel weighs 21 lbs, the S4 N/A is #326 and weighs 24lbs.

Do not install the S4 flywheel on a S5 engine, the rotating assembly will be out of balance.

The N/A clutches are interchangeable.

rotary_rx7fc

Sweet thanks for the replies!
PS I'm using both the transmission and driveshaft from an 88. So I need the 88 starter correct? The 89 autos starter won't work because the number of teeth?

scathcart

No, the starters are identical between s4 manual and s5 manual; I don't know where iduley got that.

Banzai-Racing

iTrader: (11)

You can not use the Auto starter because it is the same mating flange as the TII, you can use the S4 N/A starter on the S4 N/A trans with the S5 Flywheel and S4 clutch

2-N-D-pink

iTrader: (27)

No one say anything about the difference in automagic starter harness and 5 speed. Im not 100% on what it was but i know there is a bit of difference in the two.

Banzai-Racing

iTrader: (11)

Neutral safety switch, automatic throttle body is also different.....along with numerous other parts

rotary_rx7fc

I don't have to Change the throttle body do I?

lduley

iTrader: (1)

Didn't say I was 100% positive lol