How will a lighter flywheel (act streetlight) effect the launch on a low HP 135whp car. will I have bogging problems? I need to replace my clutch and have been thinking about a flywheel. But I don't want to bog any more than I do now. Any advise?

 

bump for an answer

 

It might bog a bit. Just launch at a higher rpm.

 

your rpms will definately drop much faster than you expect. for a setup like yours, just replace the clutch and resurface your stock flywheel.

 

Do you all recomend a lighter fly? I would think it would help get up through the gear quicker?

 

get the lightest flywheel you can find...

 

less rotational mass but less inertia, its a tradeoff

 

there is NOTHING bad about less inertia.... therefore there is no tradeoff

 

i have a JUN lightened flywheel for sale, for a B series $220 shipped obo 40k miles on it. like the other posts said, you have to launch higher in order not to bog, also helped me out top end.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDogg &raquo;</TD></TR><TR><TD CLASS="quote">there is NOTHING bad about less inertia.... therefore there is no tradeoff</TD></TR></TABLE>

hmmmm, going up hills will take more time, car will feel sluggish. and deffinately the launch will bog (launching at a higher RPM might help)


an ACT streetlight wouldnt be bad for a D series, or a B16..... the revs will come up a little quicker..... its a trade off for sure, but you'll like it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDogg &raquo;</TD></TR><TR><TD CLASS="quote">there is NOTHING bad about less inertia.... therefore there is no tradeoff</TD></TR></TABLE>
how do you figure

less weight= less inertia= less stored energy= weaker launc= possibly the ability to fall out of boost between shifts. I'm not totally knocking the lightened flywheel idea, i've got a 9lb on my boosted h22, i just don't understand your logic about inertia


Modified by b16hybridsol at 2:32 PM 6/22/2005

 

inertia only helps crappy drivers. less inertia in the flywheel allows more power to be put to the tires. you will have to keep more carefull control over the gas pedal to launch properly and it will NOT effect driving up hills, other than allow you to do it faster.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDogg &raquo;</TD></TR><TR><TD CLASS="quote">inertia only helps crappy drivers. </TD></TR></TABLE>

OK, now a random *** nobody calling himself "jdogg" is arguing with years of physics theories!?!?

go figure.

 

dude, you're full of ****.

if inertia is so GOOD then why the hell do you spend big bucks on super light weight pistons and rods, why do you spend a **** ton of money on super light weight twin disk clutches. where do you want your power going, into a flywheel or to the ground.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDogg &raquo;</TD></TR><TR><TD CLASS="quote">dude, you're full of ****.

if inertia is so GOOD then why the hell do you spend big bucks on super light weight pistons and rods, why do you spend a **** ton of money on super light weight twin disk clutches. where do you want your power going, into a flywheel or to the ground. </TD></TR></TABLE>

JDogg, that may seem like how it works, but it's not. The more energy you can store while staging, the more you will release at launch when you release the clutch. And remember that the flywheel has less to do with horsepower than it has to do with torque. You're not storing horsepower, you're storing rotational energy or torque in it. If you can store it up in the flywheel with a small horsepower car, then you release not only the enignes torque to the ground, but what is also stored in the flywheel, you can see the advantage. This isn't a "light as possible" type of set-up, it's something you have to tune. Too much energy released with a particular setup will mean zero traction. If you go too light with a certain set-up, say 9lbs on a 135whp car with 20" slicks, you're going to bog hard regardless of what RPM you launch at. The situation gets more sticky when you add building boost into the equation.

Following your logic, why would the aftermarket equipment manufactures not make a flywheel that weighs 3lbs? You can't always believe what those companies say when they list their features. Oooo, lightweight components. That sounds great! Well, not always. Remember, they're not trying to tell you how to build your engine, they're trying to sell their product. If they can list lightweight as another reason why their product is superior, then sure as ****, that's what they're going to do.

The advantages to the lighter flywheel can be seen when making the run and allowing the crank to accelerate faster. If it were lighter is better, the OEM manufacturer would make it light as hell from the factory.

 

good info. Thanks for the help.