450 left front spring on smack down

[jack06]

Thinking about trying a 450 on the left front the track I race has short tight corners and im a little tight getting in. I'm running a 400 right front.

[TheJet-09]

What are you currently running on the LF? I believe the base-line is a 475/500 on the LF and a 350 on the RF. With you having/needing a stiffer RF than that I'd probably look to adjust elsewhere. Are you by chance steel block/steel head?

[jack06]

What are you currently running on the LF? I believe the base-line is a 475/500 on the LF and a 350 on the RF. With you having/needing a stiffer RF than that I'd probably look to adjust elsewhere. Are you by chance steel block/steel head?

Steel motor and have to wight 2450 after the race. Had a 500 on the left front.

[Matt49]

Try a 475 first unless you are REALLY trying to free it up getting in.

[hucktyson]

If you have a 450 and not a 475 you may as well try the 450 and if
It's too much you can always get a 475 then. It mostly changes how hard the car wants to rotate when you lift on entry , if your not getting completely out of the throttle on entry it won't make much difference .

[MachineMasters]

I have been as low as a 450LF and could bottom out the shock under braking on entry.

[hpmaster]

I have been as low as a 450LF and could bottom out the shock under braking on entry.

If you were on a straight 10" 450lb spring I am pretty sure you were in coil bind before you could bottom out a shock.JMHO

[grt74]

we have run as low as a 300 on the lf,remember a shock has a lot to do with a setup like that,what we are starting to see is less and less on the lf because we are trying to keep it down more and more,the reason for such big springs on the lf was it would crash down,with todays setups thats not happening as much anymore,there are other things to find there also,we are testing a bunch with lf setups and have started to see some gains on the stop watch,mostly to me its still an entry spring adjustment

[Garrettshurling]

We run a 400LF all the time. I don't think a 50 lb spring change on the LF is too radical. If your running on at tight cornered race track and we can probably assume your decelerating on entry, that adjustment should do what you want it to do!

[Drop Shock]

400 is pretty stiff on the right front, most guys are running 325 and 300s

[hpmaster]

400 is pretty stiff on the right front, most guys are running 325 and 300s

thread was talking about left front springs

[Drop Shock]

thread was talking about left front springs

Yea but the dude said he was trying to free up entry and said he was 400 rf. It's pretty simple the softer you are on the right front the better your gonna steer.
You just have to find out at what spring rate you start to bottom out at, I know a lot of guys that start out on 300s and go to 250s and 225 as the night goes.

[hucktyson]

Not every car has the roll center far enough to the right to run a 275 or less on the RF. A smack down for one doesn't

[Matt49]

I agree with huck here. Even with the S7 front end (which allows for a softer RF than the old smack front end), 350 is about as low as you can go. We always ran best with a 400 even with the S7 and we got plenty of travel.

The softer spring itself isn't what is allowing for the car to steer better. In fact the old conventional wisdom of "heavy spring gets the weight" would tell us the opposite. What's happening with the softer spring is that you're squatting the RF which is doing two things: 1) lowering the roll center which makes the car steer better and 2) letting the left rear hike up sooner which makes the car steer better because of rear steer.

[hpmaster]

I agree with huck here. Even with the S7 front end (which allows for a softer RF than the old smack front end), 350 is about as low as you can go. We always ran best with a 400 even with the S7 and we got plenty of travel.

The softer spring itself isn't what is allowing for the car to steer better. In fact the old conventional wisdom of "heavy spring gets the weight" would tell us the opposite. What's happening with the softer spring is that you're squatting the RF which is doing two things: 1) lowering the roll center which makes the car steer better and 2) letting the left rear hike up sooner which makes the car steer better because of rear steer.

Not every car has the roll center far enough to the right to run a 275 or less on the RF. A smack down for one doesn't

Our Masters liked the 375 or 400 also. Good info, Matt and Huck