So in planning the turbo conversion, I have been debating with my VW buddies. Some say it is not such a good idea to run a light flywheel as the quick drop in RPM's between shifts can drop the turbo out of it's powerband/boost and make for somewhat herky-jerky shifts. Kinda boost ON/boost OFF thing. A buddy has a VR6 turbo with a light flywheel and this is def' the case. Kinda annoying to say the least. Another buddy without a lightweight wheel, and a VR6T, doesn't have such an issue.

So those of you how have done or ridden in a turbo conversion (or maybe even built one), what are your thoughts? I know the clutch does become and issue once you are over 200 ft-lbs and as such I will be doing a clutch, but I really am debating the $500 and time of doing the flywheel if it is only gonna cause more trouble than it is worth!

Oh, and a pic for clicks:

 

The only real issues I have are on leaving from a stop. The revs def drop but while up and running at wot no problems at all with spool.

 

You're TC'd right? The SC I think would offset that low RPM problem. One significant advantage to keeping the SC when adding the turbo. I am going sans-C though.

Thanks for the personal exp. though

 

I'm running turbo only and have retained the stock flywheel because of the noise associated with using a lighter non articulated one. In order to get the 6 speed trans to fit it had to be realy short and that meant that the gears had to be spread out over more shafts. The reason for the special flywheel is to dampen the noise associated with all those gears meshing. Cars with light flywheels make knocking noises when idling in neutral that most people don't like. I've tried them in various configurations and have found no other ill effects regarding the turbo. If the car is to be street driven use a clutch like the SPEC stage 3 +. Plenty of clamping force and still holds up to street driving. With the added torque produced by the turbo you'll definately need a limited slip diff as well.

 

Thanks for the info. Gonna stick with OEM flywheel and a Spec 3. I have the factory LSD.

 

this topic has been debated on tons of boards for other cars.


personally i would say go with a lighter weight flywheel. Maybe not a featherlite flywheel but a lighter flywheel would help.

My argument to many about a lightend flywheel and turbo spool times are... if its bad to have a lightened flywheel for boost than it is also bad to have lightend wheels... and that heavier wheels will have the same effect as a heavier flywheel...


yes i know that lighter weight wheels help in braking, ride and handleing... but its just the concept to think about...


no one has really ever challenged this thought process. Im open to ideas... im not saying its gospel... but i think the arguement is somewhat relative

 

While we're on the topic of clutch and flywheel changes in TC cars what are people opinions about the Exedy hyper Single which includes the chromoly flywheel in a straight turbo conversion car.

Seann

 

Thats what I have in my car! Turbo conversion and all.

 

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the exedy is amazing.... no chatter.... and holds silly power.... easy to drive....

 

I'm doing straight up turbo. Brian and Chris, wanna price the Exedy into the kit???

 

um...and now having seen it is >$1k for the clutch, I think I will stick with Spec....