Alright as I watch more car racing videos (on the track not street) I notice a lot of CTRs or ITRs where they brake hard and even without braking too hard the back tires will break free on a curve. I'd imagine the springs aren't stiff enough up front or the travel is too long right?

 

Weight shift is only determined by the center of gravity location and wheelbase.

So, the cars you're seeing have one of a few problems--

- The brake bias is wrong
- The driver is braking too far into the corner
- The rear is lifting too high (too soft spring) and the rear wheels are toe-ing out.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b*saint &raquo;</TD></TR><TR><TD CLASS="quote">the back tires will break free on a curve.</TD></TR></TABLE>

You'll also see the tires come up into the air on the inside, that's not a real problem on a FF car.

 

Re: how to keep the rear from getting too light

There are a number of factors (suspension geometry, spring rate, swaybar effect, etc) that determine the point at which the car will begin to rotate in a turn, but the short answer to your question is just to not brake as hard while turning. For any given setup, you need to know where that limit is and not exceed it by trail braking too hard or too deap into the corner. The harder you press the brake, the more weight that transfers to the front tires and off of the rears. The less weight on the rear tires, the less traction they have to hold the corner.

 

This is where a real rear spoiler would come into play on a fwd car right? Alright so since my Prelude is 67/33 or something close to that, how would I keep the weight shifting too far forward and still be able to brake really late? Stiff springs up front right? Adjusting brake bias will work also? The do sell a adjuster to retrofit to a system...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b*saint &raquo;</TD></TR><TR><TD CLASS="quote">This is where a real rear spoiler would come into play on a fwd car right? Alright so since my Prelude is 67/33 or something close to that, how would I keep the weight shifting too far forward and still be able to brake really late? Stiff springs up front right? Adjusting brake bias will work also? The do sell a adjuster to retrofit to a system...</TD></TR></TABLE>

The OEM system's brake bias is sufficiently far forward. You can also use the difference in coefficient of friction in front/rear brake pads to "adjust" the brake bias, lots of people do this on race cars).

Don't bother doing anything until you have a real problem, not an "on paper" problem.

p.s. find RR98ITR's signature. It's that simple.

 

Does brake bias really haven any effect on weight transfer while decelerating? I just don't see it.

 

An effective spoiler will help keep weight on the rear wheels in a high speed turn. I wouldn't mess with the brake bias based on trailbraking because you'll still do 80+% of your braking in a straight line, so it's much more important to have a good setup for that. If you don't have much/any track experience, you should be doing 100% of your braking in a straight line. Stiffer springs up front will keep more weight on the rear, however, you typically sacrifice turn in by not having as much weight/traction on the fronts.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chris F &raquo;</TD></TR><TR><TD CLASS="quote">
Don't bother doing anything until you have a real problem, not an "on paper" problem.
</TD></TR></TABLE>

Word.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b*saint &raquo;</TD></TR><TR><TD CLASS="quote">This is where a real rear spoiler would come into play on a fwd car right? Alright so since my Prelude is 67/33 or something close to that, how would I keep the weight shifting too far forward and still be able to brake really late? Stiff springs up front right? Adjusting brake bias will work also? The do sell a adjuster to retrofit to a system...</TD></TR></TABLE>

I would not worrier about the weight difference. my car has a split similar to yours, and I can brake plenty late

 

So bascially I cant drive it like my BMW.

 

Not unless it is a BMW MINI.

 

haha no way. i drive a real bmw.

 

Brake straighter.