shifty

iTrader: (1)

Hey guys I was wondering how many people have one of these and there thoughts as I plant to get one in the new year but ive been told if the fly wheel is to light it can compromise steering (not sure how) so id appreciate your opinions on this piece of kit.

Sik-Boy

iTrader: (1)

from all i know if not engineered properly it will throw off the balancing of the rotary engine and cause big problems id go with sr motorsports i have there light flywheel i have no problems and i can feel a difference. there flywheel comes with a balance plate with there flywheels

Flashwing

Our flywheel is neutral balanced so it does require a counterweight for proper balancing. Charles Hill, MazdaManiac and myself all run this flywheel on our own RX8s.

bse50

I have it. It's balanced and machined better than 99.99999% of any other aftermarket flywheel and is just as light as you can go before compromising driving comfort at lower rpms.

ssspeedfreak

iTrader: (1)

I have their flywheel and the spec clutch to and I love it! Charles has always asked me about how I like it and I always say how I love it BHR will support this mod all the way, no worries.

RX-865

Love love love my BHR flywheel. One of the best mods i've done other than short throw, and their midpipe

Brettus

iTrader: (2)

yes - what you heard is very true and it must have come from a very reliable source .















cough

yale02

iTrader: (16)

I have one - love it!

04RX8man

steering.......someone is drunk

shifty

iTrader: (1)

Ok cheers guys that's all I needed to know I'm glad your all pleased with the wheel and hopefully soon il be joining the ranks.

SC-ed

steering = streeting = streetability

Elektix

I think SC-ed has banged the nail on the head mate.....

I've heard the stories it can affect streetability......

Also heard it requires a few more hundred RPM to get going and it helps deceleration quite a bit aswell.....

No real reviews on Acceleration? What are people thoughts on extra pull, butt Dyno? Actual dyno? (To show how much BHP is saved compared to the OEM item?)

Brettus

iTrader: (2)

I should just tell you to search but I'm in a good mood so :

Minimal effect - not worth worrying about

good improvement in 1st less so in 2nd , fading away to nil improvement in 6th . As you would expect if you understand how this works.
No difference on a dyno because on a dyno the engine is not accelerating very quickly .

Brettus

iTrader: (2)

good point - been so long since I've driven a stock 8 that I'd started to think that this behaviour was normal .

alnielsen

iTrader: (4)

Not many people have the money to buy the flywheel, dyno the car, spend 4(?) hours to replace the flywheel and then dyno the car with the new flywheel again. If they did, you would probably complain that the dyno's weren't done back to back so the data is invalid.
Sometimes you have to trust the butt dyno.
I installed a MS lightweight flywheel and I noticed a difference right a way.

bse50

Talking in numbers i'd say that the flywheel is the single NA mod that yelds the best results.
0.2" as an average during 0-100km\h pulls per my telemetry, other users reported a 0.4" improvement but it seems just way too much for a streetable flywheel. Maybe with a 4.5inch clutch pack and flywheel

Blacknightz

waiting for restock...

Psylence

I want a flywheel badly.. I had a subaru that went from a 26lb stocker to an 11lb one. Then after an engine swap, I went to a 9lb Ultralight flywheel. Loved it. No problems in the street or snow.

No other mod makes an engine respond like a light flywheel.. but is this one going to be light enough?

Beodude

iTrader: (3)

It makes sense to me... It wouldn't act any differently than an underdrive pulley, since the flywheel is just the other side of the e shaft.

alnielsen

iTrader: (4)

The pulley doesn't weigh much to begin with, so changing it out will give you minimal gains. The underdrive pulley can lead to overheating on the street due to slowing of the water pump. Also, draining of the battery at idle. While it takes more work, a light weight flywheel is the way to make the greatest gains.

Boeuf

iTrader: (2)

Hey guys,

I just got an ACT Extreme clutch and I am planning on ordering a flywheel as well since the clutch is going to be changed.

I have been thinking about either the ACT Prolite or the BHR.

Any thoughts on which of these might be the better flywheel since they're only about $120 difference including the counter weight?

Thanks.

shaunv74

Pretty sure everyone in this thread is going to tell you they love the BHR.

As Charles mentioned it's not just about weight, it's about inertia and where the weight is concentrated on the flywheel. The same flywheel weight with the center of mass further away from the center will take more power to spin.

Here's a simple experiment for you to figure out the effect of a lightweight flywheel.

Take a rock and tie a 12" string on it. Spin it over your head.

Now take a rock that is 1/2 the weight on the same string and spin it over your head. How much less effort does it take? That's the effect of reducing the weight of the flywheel. It frees up energy usually used to keep the wheel turning. No matter how fast you spin it or whatever gear your hand is in it's the same amount of energy freed up from your muscles.

Now here is how a well designed flywheel works:

Then take the same rock and tie a 6" string over it and spin it over your head. How much less effort does it take to spin the same rock?

That is what a well designed flywheel will try to do.

MazdaManiac

iTrader: (3)

Do not use lightened fly wheels!

They don't fly any further than regular flywheels!

wait. whut?

Nemesis8

iTrader: (3)

RB is 12 lbs.

hey - is the flywheel to counterweight bolt torque 28 ft lbs? or is it based on bolt size and spec?

Easy_E1

iTrader: (2)