1 ... 53 54 55 56
Robbie (Forum Supporter)
Robbie (Forum Supporter) GRM+ Memberand MegaDork
11/10/22 1:11 p.m.

Let's do a quick catch-up on hours. As of loading for last challenge, I was at 627.

Ive spent about 10 disassembling the trans and getting these axles and mocking stuff up, so let's say we're at 637 hours invested.

maschinenbau
maschinenbau GRM+ Memberand UberDork
11/10/22 4:09 p.m.

In case anyone was as confused as me... the Cobalt doesn't use an intermediate shaft on one of the CV axles, like most FWD transmissions. The transmission takes that space instead. Strange design, but should work great for Robbie!

Robbie (Forum Supporter)
Robbie (Forum Supporter) GRM+ Memberand MegaDork
11/10/22 4:30 p.m.

In reply to maschinenbau :

Huh? No it definitely does, it's just that the CV axle pulls out of the intermediate shaft on the passenger side but still splines into the diff. 

The removed intermediate shaft is shown in front of the diff in my photo.

maschinenbau
maschinenbau GRM+ Memberand UberDork
11/10/22 4:42 p.m.

Oh cool, today I learned...

Robbie (Forum Supporter)
Robbie (Forum Supporter) GRM+ Memberand MegaDork
11/10/22 5:04 p.m.

It does look like the pedestrian cobalts use that weird wide trans... Which I didn't know about before. 

I will say it is really lucky for me that the jackshaft uses the same splines as the CV axle, and therefore it is easy to simply remove from the drive line. But I also know GM, and having one part number for CV axles instead of a left and a right probably saved them elenvty bajillion dollars or something.

Robbie (Forum Supporter)
Robbie (Forum Supporter) GRM+ Memberand MegaDork
12/9/22 11:27 a.m.

Copied from the PRI thread. 

Robbie (Forum Supporter)
Robbie (Forum Supporter) GRM+ Memberand MegaDork
12/9/22 11:28 a.m.

For reasons

hobiercr
hobiercr GRM+ Memberand UltraDork
12/9/22 11:36 a.m.

In reply to Robbie (Forum Supporter) :

I would have to say that yours is more "radical."

Robbie (Forum Supporter)
Robbie (Forum Supporter) GRM+ Memberand MegaDork
12/9/22 12:50 p.m.

In reply to hobiercr :

Well, thank you!

I'm still going to steal some ideasdevil

singleslammer
singleslammer GRM+ Memberand PowerDork
12/9/22 3:17 p.m.

In reply to Robbie (Forum Supporter) :

Did you manage to sneak into PRI?

Robbie (Forum Supporter)
Robbie (Forum Supporter) GRM+ Memberand MegaDork
12/17/22 1:44 p.m.

Robbie (Forum Supporter)
Robbie (Forum Supporter) GRM+ Memberand MegaDork
12/18/22 2:00 p.m.

Are these Datsun door hinges?

Being repurposed into lower shock mounts?

AND upper shock mounts?

On BOTH sides?

Yes, yes, yes, YES!

Ladies and (mostly) gentlemen, we have real front springs and shocks!

This project was a bit like harvesting a buffalo where you need to find a use for everything. One rear shock came with the donor cbr, and another came in a trade deal I made about 2 years ago. The door hinges as previously mentioned made for excellent shock mounts, the "risers" on the upper ends were made from the pullrod mounts we cut out of the upper a arms, and the tube connecting the sides was made from the original Datsun steering column. 

Mr_Asa
Mr_Asa GRM+ Memberand UltimaDork
12/18/22 2:08 p.m.

Oh damn.  No more bouncy bouncy on track! Giggity!

Robbie (Forum Supporter)
Robbie (Forum Supporter) GRM+ Memberand MegaDork
12/18/22 2:10 p.m.

So I can't lie, I had a 'little' help yesterday. Big shout-out to Gumby and Nocones for spending their Saturday and sprinkling their magic on FDat. 

We did a lot of eyeball engineering, but now the front of the car is suspended on real springs and dampers. Even better, I think we have a good plan for the rear!

Edit: 665 hours.

gumby
gumby GRM+ Memberand Dork
12/18/22 2:18 p.m.

Springy sprongy, dampy damping

hobiercr
hobiercr GRM+ Memberand UltraDork
12/18/22 2:50 p.m.

The Bad Decision Triangle was very small yesterday.

singleslammer
singleslammer GRM+ Memberand PowerDork
12/18/22 4:24 p.m.

Very nice!

gumby
gumby GRM+ Memberand Dork
12/18/22 8:30 p.m.
hobiercr said:

The Bad Decision Triangle was very small yesterday.

You know what that means.....

nocones
nocones GRM+ Memberand PowerDork
12/18/22 8:37 p.m.

In reply to gumby :

Point singularity.  Either we all no longer exist or one of the BDT members bought a new project.  

 

..  .  Oh crap.. 9 days until I post a new thread.

Robbie (Forum Supporter)
Robbie (Forum Supporter) GRM+ Memberand MegaDork
1/6/23 10:13 p.m.

Today I repositioned the lower shock mount on the passenger side a bit. We originally eyeballed it about 1/2 inch closer to the upright than the driver side. But it was just tacked on so I cut it and moved it. 

I also did some analysis in vsusp (very cool tool btw) on the front suspension. Let's just say I don't think it was engineered to move. Now that it will be moving, the camber gain curves will matter. There also isn't a whole lot I can adjust to make it better, but one thing I can do is I can change the effective length of the upright by adding spacers above or below the rod ends. This moves the rod ends up or down on the upright. As it turns out, I can't make the suspension "great", but I can easily make it a whole lot better. 

Even distance from lower shock mount to upright:

​​​​​

 

Then I had to finish the "compression link" at the top of the shock mounts. I can't weld this in because then the upper a arms would be trapped with no way to disassemble. So it has to bolt in. 

Therefore, I grabbed my hole saws and some cool leftover motorcycle chrome bolts and some 1/8 scrap plate. 

Then I welded those onto the ends of my Datsun stock steering column tube, voila!

Added about 3 hours today bringing our total to 668.

Mr_Asa
Mr_Asa GRM+ Memberand UltimaDork
1/6/23 10:17 p.m.

This is gonna be so damn awesome when you're done.  I berkeleying CAN'T WAIT.

If you wanna get rid of those washers on the struts I can turn something for you, I've got enough scrap that I've picked up for free.  Just need dimensions.

Robbie (Forum Supporter)
Robbie (Forum Supporter) GRM+ Memberand MegaDork
1/6/23 10:21 p.m.

In reply to Mr_Asa :

Oh, nice! Yes the washers are just for mockup but they would work in a pinch. The shock needs to be spaced rearward because of interference issues with the upper a arms. 

I'll get a good napkin drawing for you tomorrow.

Mr_Asa
Mr_Asa GRM+ Memberand UltimaDork
1/6/23 10:24 p.m.

Sounds good.  I'll dig through my scrap bin and figure out what I have that is free to budget.

ralleah
ralleah GRM+ Memberand PowerDork
1/8/23 12:54 p.m.

This thing just keeps getting radder, and radder!

Mr_Asa
Mr_Asa GRM+ Memberand UltimaDork
1/8/23 1:03 p.m.
Mr_Asa said:

Sounds good.  I'll dig through my scrap bin and figure out what I have that is free to budget.

I think I've got enough scrap for spacers.

1 ... 53 54 55 56
Our Preferred Partners
4Mqu4wnZIv7eR9eOHSFAeTaGU5oWkbsJgOHUS94e1PjDnVNcTnEM3S63WvC4fD0U