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E36 M3 Suspension in a 240z


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I really need to clean up the bottom of the frame rails! Years ago when I first painted the engine bay (POR hardnose SUCKS, or im just an idiot) I ran out before I did the bottom of the frame rails and I haven't bothered finishing them up! 
 
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Untitled by peej410, on Flickr
I really need to weld a stud to the body for the ground straps too. Details details. 
 
The passenger side header is so tight that the driver side already feels like a cake walk. It isnt my best work but Ive been trying to work on it 2 hours at a time after 12 hour days at work lately. 
 
Hopefully she will debut at LRP April 19th
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Do you have a rollcage? I welded a stud to that for a ground. Nice fresh metal tied in all over the chassis in my car...

I do, I am trying to avoid any more holes in the firewall, the fumes from the motor render it nearly useless at times. It is truly nauseating and I have a pretty solid stomach for smells. 

 

I received the slip joints for the secondaries, the flat sheet to make the megaphones and the reduction cones back down to three inch. It is going to take forever to finish but the hard part is done! 

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  • 5 months later...

I wanted to update this thread since quite a bit has happened. I decided to try to keep this thread suspension based since i trend towards rambling on about everything I am doing.

 

As promised,

 

 

First thing in the morning I spaced on the fact that I hadnt set the brake bias yet. Following a fellow instructor a handful of laps in I braked deep into big bend (like i do with my M3) locked the rears briefly then went into a long tank slapper followed by four clockwise 360s. The right front tire hopped up over the inner curbing in front of the T1 work station. Before I even came to a stop I had it in 2nd gear and was back on the throttle. Close call about 8 feet off the wall!

 

I brought it in after that to take a breath and collect myself. I took it easy the rest of day. I did get to floor it a few times (this video) which was fun!

 

These are my impressions.

 

Shorter front struts so I can get to the ride height I designed the suspension for. Only has about 1.5" of bump travel now. This way it can properly load the front tires under braking without lifting the rear to the point that its near full droop. Its only an inch but if you ask the ladies every inch counts.

 

It needs more roll stiffness in the rear, it feels like the outside tire is folding in underneath you not like its supporting the car.

 

It needs spherical bearings in the rear. On corner entry and corner exit the rear wheels toe in and toe out however they want to. The powerflex bushings deflect by hand. I bet with an 11inch wide slick and 2700lb of car at 1g is greatly changing the rear toe making it very difficult to exit corners under power.

 

It needs to be properly tuned. I will get to this over the next few weeks. It bogs at heavy load and 2500rpm.

 

It needs a steeper ratio diff. Coming into the left hander I am in the bottom of third. Entering big bend im barely at 4500 in 4th. 3rd gear lasts till after Pit in on the main straight (in my M3 i nearly redline in 4th on the front straight)

 

It needs a larger steering wheel. No power steering and a lot of hot rubber makes it a bear to turn hard below 60. The left hander is exceptionally challenging.

 

The fuel cell needs to be lowered. Exiting the essess onto no name, you can see the car kick left. Thats the fuel sloshing. (My M3 doesnt do this and I drive it way harder) I may just build a new cell from scratch with baffles and better pickup.

 

It is definitely still down on power because the AF ratio is still in the 11s down on power from poor combustion means lots of crankcase pressure from unspent mixture passing by the rings.

 

I have always built cars by a certain philosophy. If the driver is not confident he cannot go fast. When I am done with it, it will be very fast.

Edited by peej410
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