The Indiana 5.0 Swap

[rwh11385]

I used 8kg springs all the way around because that is what catuned suggested for the v8 swap, i wanted 10kg front springs and 8kg rear springs but they recommended and sent 8kg springs. I'm pretty much scrapping old parts unless anyone says otherwise they want something shipped to them. I had to cut old strut tubes to send back the stock knuckles to catuned because its a 200 dollar core charge.

Why would you want 10kg/8kg springs F/R? Are you just ignoring the wheel rates?

MORE TECH:
E30 front motion ratio: .94 (the spring moves 94% of whatever distance the wheel moves)
E30 rear: .67

The actual force the wheel sees, is called the wheel-rate.
E30: .94^2 = .88 (1000lb spring gives 880lb wheel-rate)
E30 rear: .67^2 = .45 (1000lb spring gives 450lb wheel rate)

So effectively you have installed springs twice as stiff in front as in back. Hence, understeer city question.

I ran 20% stiffer in front and even 50% stiffer in front, but not that extreme. (Even if compensating for added weight that's a bit surprising) Most people run a higher numerical spring rate in the back because of the wheel rate / motion ratio.

I'm not sure why you listened to CATuned's advice. They just seem to be slanging a kit as a one-size fits all as their "optimal" setup for people who want to stance. 392/448 lbs/in on their website is crap IMO.


Moreover, you could have run stiffer springs in the back and rely on the swaybar less. But you can drive it and see how it does. Then measure the ID of the adjuster in back and buy some eibach race springs cheap used in a better rate (600 lbs/in?) and swap them out pretty easily. And then maybe unhook the rear bar to check out how it handles differently.



One of my LeMons team has family local to you so I was just curious. We're looking for spare stock calipers and such. The strut tube cores make sense but just thought I'd check on those too.

[jalopi]

jesus christ, do you make it a point to be a dick in every single one of your posts/replies? it's what's listed on their website. i don't care if they ARE the same, the people capable of designing and manufacturing parts of that caliber clearly know more about the products' application than you or me. i don't know what the reason is, but they had one for not mentioning "also useable on the small case diffs" on their website.

[The Dark Side of Will]

FYI the jagsthatrun.com diff flange is meant for the medium case diff (for when you go to make your driveshaft)

It works with any diff that has a 4 bolt flange...

[jalopi]

LOL yeah dude you'd have a real bad time with a small case diff.

FYI the jagsthatrun.com diff flange is meant for the medium case diff (for when you go to make your driveshaft)

Also, dem brakes

[Lebstanka]

FINALLY after much monkeying around with the dag gone stock steering column that i was told would not work with the wilwood drop pedal box, I've gotten it to fit after making some adjustments and welding a bracket to it.







pump the brakes .jpeg



in the midst of installing IE bars but get this, the rear has a bracket that needs to be drilled into the rear trunk area. who knew?



my face when i made a little progress

shouts out to Jean Luc Picard

thank you for reading, please post any love, hate, humor, advice or pictures below!! i like hearing what anyone has to say! have a good day!!

[Lebstanka]

How come you have the same spring rate all around? Understeer city?

What are you doing with your pile of old parts? Strut tubes? Stock calipers?

You're going to want a medium case diff, small case won't enjoy the torquez. Not sure on desireable ratio...

Bimmerworld is a good vendor, as is Turner. A big rear bar with that engine would be "interesting"... maybe just find a front bar and let springs do the rear body roll control.

Are you going to bring this out west to Peru for Auto-X when it is finished?

I used 8kg springs all the way around because that is what catuned suggested for the v8 swap, i wanted 10kg front springs and 8kg rear springs but they recommended and sent 8kg springs. I'm pretty much scrapping old parts unless anyone says otherwise they want something shipped to them. I had to cut old strut tubes to send back the stock knuckles to catuned because its a 200 dollar core charge.

IE read something off this thread and emailed me and i actually bought the IE bars after some communication with them so i have the spec e30 IE sways now.

Im not really sure what i want to do with the car. I know in less than 5 years i want to slowly upgrade it to (MAYBE) a Global Time Attack car but that is a dream. I'm not sure how achievable.

thank you for the diff advice!

[rwh11385]

How come you have the same spring rate all around? Understeer city?

What are you doing with your pile of old parts? Strut tubes? Stock calipers?

You're going to want a medium case diff, small case won't enjoy the torquez. Not sure on desireable ratio...

Bimmerworld is a good vendor, as is Turner. A big rear bar with that engine would be "interesting"... maybe just find a front bar and let springs do the rear body roll control.

Are you going to bring this out west to Peru for Auto-X when it is finished?

[Lebstanka]

Hmm, well I work here at IE. There was a production batch that took some time but we've been back in stock for a good week and a half now.

You should have been updated to the backorder from the beginning, something doesn't add up. What was your order number (PM me)?

PM'd

[SkiFree]

Hmm, well I work here at IE. There was a production batch that took some time but we've been back in stock for a good week and a half now.

You should have been updated to the backorder from the beginning, something doesn't add up. What was your order number (PM me)?

[Lebstanka]

hello anyone reading this,

I am currently stuck on this problem

http://www.r3vlimited.com/board/showthread.php?t=336460

The car has grown wheels (back shocks not attached)



I still need to purchase

a diff
fab driveshaft
sway bars (since ireland engineering stinks)
radiator

suggestions welcome! thanks for reading!

-Austin

[e30_302]

I like mine, bout all I can say. Get the adjustable links and convert to M3 style links up front. The best way to make these front suspensions work is to not let it work.

[Lebstanka]

I think I'm going to order different sways then. Are Bimmerworld bars my next best bet?

[e30_302]

Should have gotten the BimmerWorld bars.

[jalopi]

Holy shit, my cage builder just finished cranking out a cage in 1/3 that time... ask for a refund and order from some place else?

[Lebstanka]

edited out