New to Subies, need flywheel and clutch help

[spydrb8]

I'm doing a subaru conversion on my race bug and I've got an 07 US sti ej257 and a jdm 5sp ty754vbaaa ver 5/6 trans. The trans has a pull type clutch on it and I need to know if what I have will work.

I got this flywheel off nasioc,


What I need to figure out is if there is any difference between the push or pull type pressure plates and flywheels. Is there a difference between push or pull clutch flywheels? Can I just buy a pull type clutch, bolt it on and be fine with this motor/trans combo?

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[Half Crazed]

Not trying to be a jerk, I'm not too familiar with clutches.. but would this help?

http://forums.nasioc.com/forums/show....php?p=9878792

[Aaron'z 2.5RS]

Do you know what the FW came off of exactly? Looks like a pull style, dualass to me.

The clutch follows the trans that also means the FW follows the clutch..

That being said once you know what the flywheel cam off of you can determine if itll work with the clutch..

My older trans uses a push clutch and singlmass (flat) flywheel

[dangerousatom]

Thats an aftermarket FW, so there should be some markings on it to ID the manufacture and type. That FW also has a replaceable surface, so if its a pull type mate to the clutch then your in for cheap....otherwise your going to have to get a full Clutch and FW.

For your BUG application Id go with a FW thats stock or near stock weight, the one in the pic looks to be on the heavier side particularly if its all steel. A lighter FW will only slip more before engaging, even if your converting it to RWD. Plus if your on loose surfaces like sand-mud-gravel the heaver FW will let you engage the clutch at at lower RPM and still have enough rotational mass to get you moving.

[Aaron'z 2.5RS]

^^^ my LWFW/clutch combo has zero issues getting my heavy ass car moving on dry pavement, I doubt there would be much issue in a car half the weight and traction limited surfaces...

The FW in the pic above is a dual mass, meaning 2 steel rings (friction and starter) on a aluminum base..

[spydrb8]

dangerousatom: I know the flywheel is an 11lb. aluminum Aasco racing unit that fits 04-07 sti, but I don't know how to tell by looking at it, if it's a pull or push type. I bought the flywheel not knowing there was a difference so I'm hoping this is a pull type flywheel, and I'm waiting to find out for sure before I pick up the rest of the parts. My bug weighs 2050lbs with me and a full tank, and is a road race/autox/hillclimb monster with (relatively) large 275 slicks.

Half Crazed: While very informative, it didn't have the info I was looking for, thanks

Aaron'z 2.5RS: This is a single mass flywheel not dual mass. Dual mass flywheels are multi-part with springs or rubber that help smooth power pulses from the motor. One part connects to the crank, another part takes the clutch and pressure plate, and they fit together with springs (rubber or steel) and work similarly to a sprung hub clutch disc. Usually they are very heavy, right around 30 lbs in the case of my old e46. Even though this flywheel has a steel ring and friction surface on an aluminum disc, it's a single mass that is directly bolted to the flywheel.

I guess my question still stands, is this a pull clutch style flywheel?

[dangerousatom]

Ah I had figured you were making a sand rail or dune buggy type bug setup. If your looking for top speed/hill climb type racing then a LWFW will be better since you will be winding out the RPMs

It looks like Aasco only makes 5 Suby FWs

look for these #
107103-11
107104-11
107104-11 this is the 6 speed FW
107106-11
107107-11

[spydrb8]

This flywheel is a 107105-11, which says 04-06 sti everywhere I find it, but I still can't find info detailing if it's push or pull.

[Concillian]

STI is 6speed and 6MT are all pull type.

There are stories of people fitting a 6MT clutch and flywheel into a 5MT, but it does require grinding some of the web in the bellhousing.

If this isn't appealing to you, you need to get a 5MT pull type flywheel and clutch. 02-05 WRX is the filter to use to get the largest selection flywheels and clutches for pull-type.

[Aaron'z 2.5RS]

Originally Posted by spydrb8

dangerousatom: I know the flywheel is an 11lb. aluminum Aasco racing unit that fits 04-07 sti, but I don't know how to tell by looking at it, if it's a pull or push type. I bought the flywheel not knowing there was a difference so I'm hoping this is a pull type flywheel, and I'm waiting to find out for sure before I pick up the rest of the parts. My bug weighs 2050lbs with me and a full tank, and is a road race/autox/hillclimb monster with (relatively) large 275 slicks.

Half Crazed: While very informative, it didn't have the info I was looking for, thanks

Aaron'z 2.5RS: This is a single mass flywheel not dual mass. Dual mass flywheels are multi-part with springs or rubber that help smooth power pulses from the motor. One part connects to the crank, another part takes the clutch and pressure plate, and they fit together with springs (rubber or steel) and work similarly to a sprung hub clutch disc. Usually they are very heavy, right around 30 lbs in the case of my old e46. Even though this flywheel has a steel ring and friction surface on an aluminum disc, it's a single mass that is directly bolted to the flywheel.

I guess my question still stands, is this a pull clutch style flywheel?

Doh.. I see...

[spydrb8]

Clearancing the bellhousing is no big deal since I'll need to do the same for the webbing around the differential for the flipped R&P. Thanks for the info!

[Aaron'z 2.5RS]

Originally Posted by spydrb8

This flywheel is a 107105-11, which says 04-06 sti everywhere I find it, but I still can't find info detailing if it's push or pull.

Its a pull type..

Pull types lift the clutch away from the flywheel bolts and allows the TOB to sink towards the crank..

Push type is flat as the clutch crowns away from the crank bolts..

Ive never delt with a dualmass FW so I had a 50/50 chance on that one..