Lightweight flywheels

boise-nic · Post by **boise-nic** » Tue Oct 13, 2009 12:26 am

What is everyone's opinion on lightweight flywheels like Fidanza. The obvious advangage being it will rev quicker in the lower gears. What are the disadvantages of these? Would they work well in the mightymax?

The supposed FWD flywheel that I bought is actually a AWD flywheel. The teeth don't even touch the starter so I must go get another one and have it machined to accept a pilot bearing. I thought I'd check out some of the light weight aftermarket flywheel offerings. The 4G makes great power but lets face it, it revs about a freely as a boat anchor compared to some like my Z's motor (VQ). It would be nice to make it a little freer reving. I don't plan on camming the motor so I would think Idle would still be fine.

lsr mike · Post by **lsr mike** » Tue Oct 13, 2009 8:46 am

I used the Starion Flywheel from Fidanza P/N 161261 for my (6 bolt) Mighty Max. everything fits, even the pilot bearing.

Bill Hincher · Post by **Bill Hincher** » Tue Oct 13, 2009 9:32 am

I have seen a couple guys post pic's of OEM flywheels breaking at the crankshaft, I dont know anything about the wear or the power of the engine, but it lead me to believe and stronger center is a good option for the flywheel
I have had some guys with over 900hp get a vibration with the six bolt after half a seasons run, so I am thinking the 7 bolt may be the only way to go with the higher horse power ratings

lsr mike · Post by **lsr mike** » Tue Oct 13, 2009 10:21 am

7 Bolt = Crankwalk. I stay away from them.

http://www.roadraceengineering.com/walk ... kshaft.htm

I did break off the Flywheel bolts at 8100 RPM on the cast iron unit. Fun getting the remnants out of the crank. The Flywheel ended up with a crack thru the center section, Hence the Fidanza unit.

Bill Hincher · Post by **Bill Hincher** » Tue Oct 13, 2009 1:53 pm

lsr mike wrote:7 Bolt = Crankwalk. I stay away from them.

http://www.roadraceengineering.com/walk ... kshaft.htm

hogwash, crankwalk is for guys that dont know what they are doing, anyway, my couplers work with automatic's not manual transmissions, a 7 bolt EVO crank should hold the above 800 horsepower crowd

boise-nic · Post by **boise-nic** » Tue Oct 13, 2009 1:56 pm

lsr mike wrote:I used the Starion Flywheel from Fidanza P/N 161261 for my (6 bolt) Mighty Max. everything fits, even the pilot bearing.

So the part you mentioned comes with the pilot bearing? I'm not familiar with starion parts. Are you saying that the stock starion flywheel has the pilot bearing and there is no need for any machining to fit?

Looking at the price for starion flywheels, they are quite a bit more expensive than getting a FWD DSM flywheel. Like $100-$150 MORE than a FWD DSM flywheel! Why would that be?

boise-nic · Post by **boise-nic** » Wed Oct 14, 2009 4:03 pm

^Also, if I do order a starion flywheel, I assume the teeth will still mesh with the normal DSM starter?

Wilbur · Post by **Wilbur** » Thu Oct 15, 2009 11:33 pm

lsr mike wrote:I used the Starion Flywheel from Fidanza P/N 161261 for my (6 bolt) Mighty Max. everything fits, even the pilot bearing.

What starter and transmission are you using?

boise-nic · Post by **boise-nic** » Fri Oct 16, 2009 1:20 am

Wilbur wrote:
lsr mike wrote:I used the Starion Flywheel from Fidanza P/N 161261 for my (6 bolt) Mighty Max. everything fits, even the pilot bearing.

What starter and transmission are you using?

I have the starter from a 90 talon tsi awd. I also still have the mighty max's starter.

I am using a W58 with one of Bill's adapters. It was intended for a FWD dsm flywheel so I would just need verification that the starion flywheel is the same as the FWD dsm's.

lsr mike · Post by **lsr mike** » Fri Oct 16, 2009 8:00 am

The Pilot Bearing is the stock unit from Mitsubishi, No machining required presses right in, it did not come with the Flywheel. I'm using a Stock Starter and Manual Transmission RM521-GDL. Bill says his adapters are for Automatics so all this may be for naught.

boise-nic · Post by **boise-nic** » Fri Oct 16, 2009 1:53 pm

lsr mike wrote:The Pilot Bearing is the stock unit from Mitsubishi, No machining required presses right in, it did not come with the Flywheel. I'm using a Stock Starter and Manual Transmission RM521-GDL. Bill says his adapters are for Automatics so all this may be for naught.

Well for my application, the flywheel needs to be from a FWD DSM. So as long as the starion flywheel is the same, I should be able to use it and just pick up the pilot bearing from mitsu to get it pressed in.

jeffball610 · Post by **jeffball610** » Sat Oct 17, 2009 4:02 pm

I'm running a FWD Fidanza flywheel on my 4G63 swapped Colt GT. With that and the balance shafts removed, it revs very freely. My only complaint is that you need to give it a little more revs off the line to get things moving. Revs also drop a little faster and can sometimes stall my car if I rev too high and just let off the clutch. (ie pulling up to a stoplight)

Make sure you get an aluminum flywheel install kit consisting of studs for the pressure plate and a steel ring for the crank bolts. Both items are meant to keep you from messing up the soft aluminum.

I'm a big fan of this when looking for "free" performance. Again the downside would be if you're simply building a street only/ daily driver type of car. But then again, who of us is actually doing that?