Jump to content
RTz

510 (Bart) w/BMW E30 Front Suspension

Recommended Posts

I got tired of front end tramlining and the rubber band feel of the steering (even after a nearly complete front end rebuild) and opted for a change. I have had some success getting E30 M3's to work very well and, geometrically speaking, the standard model E30 is very similar. And, it 'almost fits' ;-)

 

 

Drug a junkyard find home and visegripped it into a mock-up mule...

 

 

CrossmemberA.jpg

 

 

CrossmemberB.jpg

 

 

Strut location needed to achieve 9 degrees caster and 1.5 degrees camber....

 

 

CasterA.jpg

 

 

CasterB.jpg

 

 

FrontView.jpg

 

 

Steering shaft location...

 

 

SteeringShaft.jpg

 

 

 

 

 

Decided it was 'worthy' and 'so it began'.

 

 

Pulled the SR20DET...

 

 

SRDimeRunning.jpg

 

 

 

BMW crossmember welded in...

 

Crossmember.jpg

 

 

MotorMount.jpg

 

 

Lollipop modifications...

 

 

 

OELollipop.jpg

 

 

 

ModLollipop.jpg

 

 

 

Lollipop.jpg

 

 

 

LollipopDia.jpg

 

 

 

Strut tower rework...

(Apron and tower are 18ga, top plate 10ga, and gussets 16ga.)

 

 

TowerClose.jpg

 

 

TwoTowers.jpg

 

 

 

Tower-1.jpg

 

 

 

TowerBottom.jpg

 

 

 

 

towerpaitedB.jpg

 

 

 

towerpaintedA.jpg

 

 

 

Undercoated.jpg

 

 

 

TowerContrast-1.jpg

 

 

 

ReadyforSR.jpg

 

 

 

BackIn.jpg

 

 

 

BMW power steering pump...

 

 

BartPSPump.jpg

 

 

BartPSPump2.jpg

 

 

PSHiInstalled.jpg

 

 

 

First drive...

 

Twisty back-roads for about 20 miles or so. The first thing that hits you, of course, is the steering effort. The power assist makes for effortless steering even in maximum G corners. Steering feel is light years more advanced. The sensation of steering the wheels with giant rubber bands is GONE (although on center feel isn't as crisp as I had expected). Steering is also substantially quicker and the car has a noticeably tighter turning radius. Is there more grip? Tons more. Even with overly stiff front springs, the car rotates almost nasty like... but in a good way :) Is the darty-ness gone? I *think* so. I haven't driven it on my regular highway's yet, but looking good so far.

 

The BMW front calipers are a small caveat. They're not as compatible with the master cyl. as I had hoped (master too small). A minor fix. I probably wont mess with it until the rear suspension is sorted.

 

The most disappointing change has been the fluid filled motor mounts. They remove a slight amount of vibration and noise, but now the motor moves all over the place, and I mean to the tune of an INCH of vertical movement. I can feel the wind-up and the secondary bounce of the motor on rougher roads. They are ridiculously soft. I haven't installed the hood yet and I'm a little concerned about hood clearance.... and the additional stress on the plastic radiator.

 

I discovered a worn ball joint on reassembly, so he's parked for now. I've got a small road trip planned this weekend. Hopefully I'll have made the repair by then and can report on general road manners.

 

Second drive...

 

Replaced the BJ the following day. Took it out for a drive... and completely lost the front brake circuit. Some digging revealed the master cylinder had gone belly up (pure coincidence). Swapped in a new 15/16" MC. Fixed. It 'needed' a bigger MC, but I may have gone too far... 7/8" would probably be 'just right'.

 

Spent about 5 1/2 hours behind the wheel, mostly highway travel... Bart is officially a two-finger car. Yeeehaaaaa! Even in the nastiest of ruts, it no longer jerks the wheel out of your hand and requires only minor steering correction. It's sensitive to driver input, but no longer bullied by road irregularities. Just right for a 'sport car'.

 

It does have a somewhat numb on-center feel, but I have a couple idea's for that. The front pads need to be replaced with something aggressive to help with brake bias (and decrease pedal effort). And the soft motor mounts are causing a couple of contact points. A bit more fiddling and I think it will all come together nicely.

 

Been driving Bart nearly every day, since. Still some tweaking to do, but overall, I'm happy :D

 

There is one facet of this that I would like to see work out better. Track width. The BMW suspension is a little wider than what I would like...

 

 

BartTrack.jpg

 

 

Nothing flares can't fix :lol:

Edited by RTz

Share this post


Link to post

Awesome metal and fab work. Very well thought out.:thumbsup:

Edited by woodside4032

Share this post


Link to post

WOW man Wtf! Nice job!

 

Your are great to me like Bob, Mike, Bee, Fineline, Ice, and Hainz.

Share this post


Link to post
what did you do about the bolt pattern?

 

the front suspension is still a 4 bolt

Share this post


Link to post
you may be right... but I only see a single pattern. :o

 

Im trying to remember but I wasn't paying attention to the lugs last time I was there lol

Share this post


Link to post

:D All four wheels are 4x100, a direct fit to the BMW hubs. In the rear, I'm using Modern Motorsports adapters/spacers.

 

Thanks for the kind words :)

 

 

Oh, and Skib... :fu:

Share this post


Link to post
:D All four wheels are 4x100, a direct fit to the BMW hubs. In the rear, I'm using Modern Motorsports adapters/spacers.

 

Thanks for the kind words :)

 

ahhhhhh

 

 

 

Oh, and Skib... :fu:

 

 

if your gonna do it, do it right :fu:

 

ron.jpg

 

Ill just have to distract you for a while :lol:

 

P7240033.jpg

 

P7240034.jpg

 

 

:lol: :fu:

Share this post


Link to post

:D Iv maxed out an entire photobucket account, Iv got a pic to pull out of the archives for every occasion :lol:

 

 

lolz dont forget the video :P

Share this post


Link to post

that is just bad ass i wish i had the skills and a welder to do somthing like this truly inspiring man

Share this post


Link to post
that is just bad ass i wish i had the skills and a welder to do somthing like this truly inspiring man

 

ditto

 

that fab work is art :D

Share this post


Link to post

just cut it out and put in BMW stuff, simple solution :D

Share this post


Link to post

Dude your fab work is amazing! Adding rack and pinion plus power steering to 510's makes a world of difference. It looks like you did the test fitting in a wagon. You must have quite a collection :D

 

What made you go with 9 degrees of caster? How much caster were you running before the conversion?

 

 

What is the plan with the rear suspension?

Share this post


Link to post

F'ing Gorgeous! I though I had some metal skills, but your work is artisian! Just curious what guage steel did you use on the strut towers?

Share this post


Link to post

you got some mean fab skills, very nice work.

Share this post


Link to post

if i were to bring my datto to you would you do this to mine? please?

Share this post


Link to post

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.