Mods to DeDion tube
Hello,
was wondering if anyone had any experience with lowering the Watts link pivot on the rear of the tube. from what i understand it will help with the roll center of the front of a lowered car.
i remember seeing it done on a Swedish? alfetta a few years back - they lowered it @30-40mm.
thanks
was wondering if anyone had any experience with lowering the Watts link pivot on the rear of the tube. from what i understand it will help with the roll center of the front of a lowered car.
i remember seeing it done on a Swedish? alfetta a few years back - they lowered it @30-40mm.
thanks
the easiest way is to cut the tube (not all the way through) about 10cm fron the middle and bend the center down.
Angles you will have to work out by ourself but anything between 1 to 4 degrees depending on tires and type of driving.
Look out for toe changes too, they tend to be not so straight fron the factory (or 15 years of driving).
Angles you will have to work out by ourself but anything between 1 to 4 degrees depending on tires and type of driving.
Look out for toe changes too, they tend to be not so straight fron the factory (or 15 years of driving).
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!
That is an idéa, but it is more difficult to control the exact angles.
You can also give it some toe-in by put a couple of serieous welds on the pipe, it will pull the pipe crooked as it goes cold.
Pretty difficult to control though so practice first.
You can also give it some toe-in by put a couple of serieous welds on the pipe, it will pull the pipe crooked as it goes cold.
Pretty difficult to control though so practice first.
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!
- AlfaRacer75
- Silver
- Posts: 6
- Joined: Mon Nov 29, 2004 2:00 am
- Location: San Diego, CA
- Contact:
Can someone explain to me why adding negative camber to the DeDion is beneficial? It seems to me that negative camber shouldn't be needed. The advantage of the DeDion is that it always keep the tires perfectly perpendicular to the road.
The whole point of negative camber is to make the tire flat against the road when the car is leaned over, correct? Are you adding negative camber in the rear just to make up for the tire flexing/distorting?
I can see the advantage of changing toe, but not camber.
The whole point of negative camber is to make the tire flat against the road when the car is leaned over, correct? Are you adding negative camber in the rear just to make up for the tire flexing/distorting?
I can see the advantage of changing toe, but not camber.
Alfaracer 75: I am no expert at this field. As you say the de-dion is a stiff aksel. But at much pressure the de-dion will flex, so will the sides of the tyre. Normal you make the de-dion camber to about 2deg.... If you compare this to other cars like BMW with no stiff rear aksel they use, (DTC) Danish Touring car champ, as an eksample,6-7 deg neg camber.
I have tested 75s both with an without camber on nurburgring an I can garantee you that the neg camber give better grip.
Jarle
I have tested 75s both with an without camber on nurburgring an I can garantee you that the neg camber give better grip.
Jarle
The common misconception is that the best grip is when the tire has 0 degrees of camber when loaded, this is not the case... Well, not when turning anyway.
The tire needs to lean a bit to be able to work at it's full potential. I can't explain it logically but it has been known for a long time by those who are quick.
Measure the heat across the tire width and you will see that the outer edge will be much hotter if you have 0 deg. camber.
Z: My GTV ( ) has modified angles, very nice behaviour. Does not have the modded watts-link pivot point though. You might wanna think about that modification for a while, at least if you are going to modify your front end...
Watch the roll-axis.
The tire needs to lean a bit to be able to work at it's full potential. I can't explain it logically but it has been known for a long time by those who are quick.
Measure the heat across the tire width and you will see that the outer edge will be much hotter if you have 0 deg. camber.
Z: My GTV ( ) has modified angles, very nice behaviour. Does not have the modded watts-link pivot point though. You might wanna think about that modification for a while, at least if you are going to modify your front end...
Watch the roll-axis.
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!