Old track car project - new update

[rustomatic]

This looks interesting. So a C4-type suspension is also called a five-link, I think, and the DSE setup is called a "decalink," which sounds like a Bruce Jenner-style update (the Olympics version, not the modern one). It's hard to tell via DSE's site, but is there now some semblance of an upper control arm? Aside from that, it looks very similar to the C4 setup (with batwing!), which I recently learned was largely pirated from early Indy car-type setups (makes me feel better about my C4 stuff) . . .

Nice stuff!

[mfain]

Originally Posted by rustomatic

This looks interesting. So a C4-type suspension is also called a five-link, I think, and the DSE setup is called a "decalink," which sounds like a Bruce Jenner-style update (the Olympics version, not the modern one). It's hard to tell via DSE's site, but is there now some semblance of an upper control arm? Aside from that, it looks very similar to the C4 setup (with batwing!), which I recently learned was largely pirated from early Indy car-type setups (makes me feel better about my C4 stuff) . . .

Nice stuff!

It has an upper link, a lower link, a toe link, and two forward links - so you could call it a true 5-link. The axle shafts are free-floating with CV joints and are not part of the suspension like the C-4 set-up. The C-4 uses the axle shaft as the upper suspension link, but the Decalink does not. The C-4 is, therefore, a 5-link with the axle shaft serving as the fifth suspension link. I had a C-4 based rear suspension in the car earlier, but I pulled it in favor of the true 5-link (post 26 has a photo of the C-4 based system in the car). If you look carefully at the picture I posted of the DSE unit mocked up in the car (post 27) you can see the upper link. The axles are not installed in that photo. I debated going to upper and lower control arms, but I am fond of a multi-link that applies driving and braking forces through the forward links that are parallel with the car's axis - much like the old CanAm cars. The forward links also give you a much better range of anti-dive/anti-squat adjustments than control arms, and the lateral links (upper and lower) provide for a wider range of roll center adjustment. Thanks.

Pappy

[mfain]

Finally got the motor on the dyno. 852.71 peak HP @ 7100 rpm, 685 peak torque @ 5900 rpm. Should be enough.

Pappy

[Flash68]

Jesus, that is outstanding.

[mfain]

Not bad for an NA motor. The AFR was a little fat, especially 3500-4500 rpm, and the timing was only at 34 degrees, so there was a little more to be had with tuning. I will do that when I get it on the chassis dyno.

Pappy

[rixtrix1]

Wow!

[SSLance]

Originally Posted by mfain

Not bad for an NA motor. The AFR was a little fat, especially 3500-4500 rpm, and the timing was only at 34 degrees, so there was a little more to be had with tuning. I will do that when I get it on the chassis dyno.

Pappy

Attachment 68516

Goodness gracious!!!

[mfain]

Haven't posted in a while. Finished up the Decalink rear suspension and rebuilt the trunk where I cut it up to do the rear suspension install. Added a fuel door in the deck lid so I didn't have to open the trunk (with the wing and supports that run through to the frame) every time I refueled. Cut the firewall out to move the motor back 6 more inches (for a total of 15) to get clearance between the dry sump pump and the lower control arms. Turned out to quite complicated since I had to modify the x-member to get clearance for the rear mounted starter motor and so I could pull the transmission from below the car instead of out through the cockpit, but I'm getting it done. Looks like my driveshaft will be 19 inches long - LOL

Pappy

The open 3 inch holes get air hoses that bring air from the side scoops to the differential and fuel coolers.


Firewall before the cut


Tilton Bellhousing


Reverse mounted starter

[Matt@BOS]

Originally Posted by mfain

Not bad for an NA motor. The AFR was a little fat, especially 3500-4500 rpm, and the timing was only at 34 degrees, so there was a little more to be had with tuning. I will do that when I get it on the chassis dyno.

Pappy

Attachment 68516

Well, that should be FUN!

[Flash68]

What a handful that will be!