with the bracket fixed to the diff (or in the case of the dedion alfas, to the dedion tube), the roll center is fixed at the pivot point height (fixed in relationship to the ground). its relationship to the center of gravity changes, but its relationship to the front roll center (roll couple) is fixed. which is better? hard to say, but with all respect to carrol smith, i think alfa chassis engineers are at least as good, and made their design in relation to the projected uses of the car. imho, you have to always read mr smith as if you were designing a pure (single purpose) race car from the ground up - if you read his book, it is very clear that he does not like sedans as race cars and is basically short with & dismissive of the subject.
andy kress
Re: watts link location
I disagree, if the rear roll center is fixed to the ground it can not be fixed in height to the front one since that moves up and down depending on bump.barbone119 wrote:It's relationship to the center of gravity changes, but its relationship to the front roll center (roll couple) is fixed.
The problem with having it the std Alfa way is that the roll stiffness will increase in bump and decrease in rebound. Unpredictable
Or one could just forget about all this theoretical discussion and just make the chassis "track stiff" and then go driving...
A bit like making the front end rock hard with humongous springs and AR-bars to mask the fact that the front end geometry is pretty much cr@p when you lower the car.
Mats Strandberg
-Scuderia Rosso- Now burned to the ground...
-onemanracing.com-
-Strandberg.photography-
GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!
-Scuderia Rosso- Now burned to the ground...
-onemanracing.com-
-Strandberg.photography-
GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!
Lowering the roll centre makes it weaker in roll since the centre of mass gets a greater leverage.
If you raise the front roll center back up to around where the stock is the balance front to rear is the same as on a stock car which is fine and you don't need the silly HUGE springs and HUGE anti-rollbar up front.
The IMSA 75 at the museo storico has the pivot moved up, not down.
If you raise the front roll center back up to around where the stock is the balance front to rear is the same as on a stock car which is fine and you don't need the silly HUGE springs and HUGE anti-rollbar up front.
The IMSA 75 at the museo storico has the pivot moved up, not down.
Mats Strandberg
-Scuderia Rosso- Now burned to the ground...
-onemanracing.com-
-Strandberg.photography-
GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!
-Scuderia Rosso- Now burned to the ground...
-onemanracing.com-
-Strandberg.photography-
GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!
- Maurizio
- Verde
- Posts: 680
- Joined: Wed Dec 01, 2004 4:49 am
- Location: the Netherlands, 153.1km from the N'ring :-)
someone with a large budget...... This thing is soo increadable fast on the trackhmm what the hell is this ?
(daydream mode) Who wants to sponser me, so I can quit my job and build something that beautifull.
Ps the imsa at museo storico wasn't that a rally car?
Banned.. ? Daily donky.. ==> BMW 325d
E36M3 (3.0) Ringtool ==> definitely BANNED!
AR 75 TS Ringtool '90, AR Spider 2000 veloce '79
E36M3 (3.0) Ringtool ==> definitely BANNED!
AR 75 TS Ringtool '90, AR Spider 2000 veloce '79