The Cobra Adventure
Discussion
CKY said:
Those are 2 great shots, love the lighting/exposure and the car looking superb obviously 
Taken from a video by Melior Studioshttps://www.instagram.com/reel/Cw2ddIzqdPi/?igshid...
Also this fella,
Told me to read this book:
So I bought it and read it on holiday. It was amazing.
The knowledge gained really makes me want to tackle some of the inherent issues with BMW E36/E46 based suspension.
The main one being the level of squat I get under power. Quite a few E36 people suffer from this too but not many are up at the 500lb/ft mark.
Issue being that is once lowered an E36 mount point for the rear trailing arm is below the centre line of the rear hub, thus giving a high squat geo. Lots of people fix this in E36's by running way over the top spring rates the rear, but all that does is give a s**t ride.
So I want to look at raising my rear mount point. Shouldn't be too hard with my chassis. Raising it 40mm should give me near neutral squat geo.
Wisefab sell some fancy arms to do this too, but they are nearly £1600!
Told me to read this book:
So I bought it and read it on holiday. It was amazing.
The knowledge gained really makes me want to tackle some of the inherent issues with BMW E36/E46 based suspension.
The main one being the level of squat I get under power. Quite a few E36 people suffer from this too but not many are up at the 500lb/ft mark.
Issue being that is once lowered an E36 mount point for the rear trailing arm is below the centre line of the rear hub, thus giving a high squat geo. Lots of people fix this in E36's by running way over the top spring rates the rear, but all that does is give a s**t ride.
So I want to look at raising my rear mount point. Shouldn't be too hard with my chassis. Raising it 40mm should give me near neutral squat geo.
Wisefab sell some fancy arms to do this too, but they are nearly £1600!
My Squat geo issue.
Squat = Bad. Its essentially weight coming off the rears during acceleration (they are driving themselves upward into the body) along with the suspension compression adding camber to the rears. All of which gives less grip and more potential of doing a Mustang at a car show crash.
Green line - Front Spindle Centre line, which when under power the car wants to rotate around.
Yellow line - Centre of Gravity plane across the car.
Blue line - 0% Squat line, the interaction between the rear spindle and where the COG plane crosses the front centre line.
Orange line - Line from the rear spindle, through the trailing arm mount to the front centre line.
As you can see, the orange line is below the blue one. Ideally I want it to follow the blue one, or close to it. Below blue line = Pro Squat. Above blue line = Anti Squat.
To do so, I'll have to raise the front mounting for the trailing arm around 40mm (this should take into account driver weight lowering the car further than this photo too). Which given the space around how Backdraft make mount for the arm, should just be possible. Result.
Squat = Bad. Its essentially weight coming off the rears during acceleration (they are driving themselves upward into the body) along with the suspension compression adding camber to the rears. All of which gives less grip and more potential of doing a Mustang at a car show crash.
Green line - Front Spindle Centre line, which when under power the car wants to rotate around.
Yellow line - Centre of Gravity plane across the car.
Blue line - 0% Squat line, the interaction between the rear spindle and where the COG plane crosses the front centre line.
Orange line - Line from the rear spindle, through the trailing arm mount to the front centre line.
As you can see, the orange line is below the blue one. Ideally I want it to follow the blue one, or close to it. Below blue line = Pro Squat. Above blue line = Anti Squat.
To do so, I'll have to raise the front mounting for the trailing arm around 40mm (this should take into account driver weight lowering the car further than this photo too). Which given the space around how Backdraft make mount for the arm, should just be possible. Result.
This winters projects are growing.
Header tank back from CSK.
Some 250lb springs for the front as I feel its far over sprung with 400lb ones in there.
New mocal oil system to get rid of the sub standard torques stuff.
LSD waiting to go in hiding under everything.
And the ITB's well that's an idea in the making.
Header tank back from CSK.
Some 250lb springs for the front as I feel its far over sprung with 400lb ones in there.
New mocal oil system to get rid of the sub standard torques stuff.
LSD waiting to go in hiding under everything.
And the ITB's well that's an idea in the making.
Waitey said:
My Squat geo issue.
Squat = Bad. Its essentially weight coming off the rears during acceleration (they are driving themselves upward into the body) along with the suspension compression adding camber to the rears. All of which gives less grip and more potential of doing a Mustang at a car show crash.
Green line - Front Spindle Centre line, which when under power the car wants to rotate around.
Yellow line - Centre of Gravity plane across the car.
Blue line - 0% Squat line, the interaction between the rear spindle and where the COG plane crosses the front centre line.
Orange line - Line from the rear spindle, through the trailing arm mount to the front centre line.
As you can see, the orange line is below the blue one. Ideally I want it to follow the blue one, or close to it. Below blue line = Pro Squat. Above blue line = Anti Squat.
To do so, I'll have to raise the front mounting for the trailing arm around 40mm (this should take into account driver weight lowering the car further than this photo too). Which given the space around how Backdraft make mount for the arm, should just be possible. Result.
Did you get the squat geometry parameters from the book you quoted beforehand? Would like to read up on it.Squat = Bad. Its essentially weight coming off the rears during acceleration (they are driving themselves upward into the body) along with the suspension compression adding camber to the rears. All of which gives less grip and more potential of doing a Mustang at a car show crash.
Green line - Front Spindle Centre line, which when under power the car wants to rotate around.
Yellow line - Centre of Gravity plane across the car.
Blue line - 0% Squat line, the interaction between the rear spindle and where the COG plane crosses the front centre line.
Orange line - Line from the rear spindle, through the trailing arm mount to the front centre line.
As you can see, the orange line is below the blue one. Ideally I want it to follow the blue one, or close to it. Below blue line = Pro Squat. Above blue line = Anti Squat.
To do so, I'll have to raise the front mounting for the trailing arm around 40mm (this should take into account driver weight lowering the car further than this photo too). Which given the space around how Backdraft make mount for the arm, should just be possible. Result.
I have an E46 M3 that exhibits quite a lot of squat. Strangely BMW’s seem to have a larger arch gap at the front compared to the rear as standard, never understood why.
MattMF1 said:
Did you get the squat geometry parameters from the book you quoted beforehand? Would like to read up on it.
I have an E46 M3 that exhibits quite a lot of squat. Strangely BMW’s seem to have a larger arch gap at the front compared to the rear as standard, never understood why.
Is yours lowered? If you raise it 40mm the squat will stop! I have an E46 M3 that exhibits quite a lot of squat. Strangely BMW’s seem to have a larger arch gap at the front compared to the rear as standard, never understood why.
Exciting winter upgrades are under way!
Before:
After:
Lots of steps till its finished:
Machine injector mounts
Gut the carbs
Custom fuel rails
Idle control valve
Throttle linkage
Front trigger wheel and sensor
New ECU with can do 8 channel sequential fuelling
New engine loom
Tuning
And a lot of swearing and going way way over budget
Before:
After:
Lots of steps till its finished:
Machine injector mounts
Gut the carbs
Custom fuel rails
Idle control valve
Throttle linkage
Front trigger wheel and sensor
New ECU with can do 8 channel sequential fuelling
New engine loom
Tuning
And a lot of swearing and going way way over budget
Jhonno said:
Oh hello!
I'd recommend Emerald for the ECU, well priced, good support, can do all you need. If you are separating the banks for fuelling you can do dual wideband lambda. No need to spend mental money on a Syvecs type ECU which is laden with features you will never use..
I wasn't aware that emerald had 8 injector drivers or dual lambda? I'd recommend Emerald for the ECU, well priced, good support, can do all you need. If you are separating the banks for fuelling you can do dual wideband lambda. No need to spend mental money on a Syvecs type ECU which is laden with features you will never use..
Waitey said:
Jhonno said:
Oh hello!
I'd recommend Emerald for the ECU, well priced, good support, can do all you need. If you are separating the banks for fuelling you can do dual wideband lambda. No need to spend mental money on a Syvecs type ECU which is laden with features you will never use..
I wasn't aware that emerald had 8 injector drivers or dual lambda? I'd recommend Emerald for the ECU, well priced, good support, can do all you need. If you are separating the banks for fuelling you can do dual wideband lambda. No need to spend mental money on a Syvecs type ECU which is laden with features you will never use..
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