March 15, 2025, 12:43:43 AM

Author Topic: Aston Martin V8 Vantage  (Read 76017 times)

Offline digitalsolo

Re: Aston Martin V8 Vantage
« Reply #525 on: October 20, 2024, 07:12:39 PM »
Nothing in it failed, it just unseated.  Now...  how that happened, I'm unclear.  Going to do some measurements before it goes fully back together and see why it would do that.  In theory, shouldn't be possible, so maybe I mis-measured something.   At least the other one didn't do the same.

On a positive note, the CAN translator I wrote for the gauges is sorta working (tach works, temp doesn't) and the engine temp seems to be behaving itself.
Blake MF'ing McBride
1988 Mazda RX7 - Turbo LS1/T56/ProEFI/8.8/Not Slow...   sold.
1965 Mustang Coupe - TT Coyote, TR6060, modern brakes/suspension...
2007 Aston Martin V8 Vantage - Gen V LT4/TR6060, upper/lower pullies, headers, tune.
2021 Tesla Model 3 Performance - Stock...ish.

Offline MPbdy

Re: Aston Martin V8 Vantage
« Reply #526 on: October 20, 2024, 09:44:47 PM »
Holy shit! Sorry about the drama man. 

Offline digitalsolo

Re: Aston Martin V8 Vantage
« Reply #527 on: October 20, 2024, 09:50:33 PM »
Eh, it's all good.  Nothing catastrophic and easy enough to fix.   The fender is a bit annoying, but heyo, I won't do it again (probably).
Blake MF'ing McBride
1988 Mazda RX7 - Turbo LS1/T56/ProEFI/8.8/Not Slow...   sold.
1965 Mustang Coupe - TT Coyote, TR6060, modern brakes/suspension...
2007 Aston Martin V8 Vantage - Gen V LT4/TR6060, upper/lower pullies, headers, tune.
2021 Tesla Model 3 Performance - Stock...ish.

Offline Venom13132

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Re: Aston Martin V8 Vantage
« Reply #528 on: October 21, 2024, 08:59:46 AM »
never a dull moment!  Glad it wasn't worse.
1995 RX-7 Voodoo Blue- LS3, TR6060: Full Feed wide body, 57DR 18's, K-Sport coil-overs, 99 spec\ tails and Carbon Fiber spoiler, SpeedHut Gauges, Aeromotive fuel system, TwinZ Diffuser, Texas Speed LS3 Stage 2 v2 Cam Kit, Comp Cam's Rockers, McLeod Racing 6405507M RXT Street Twin Clutch kit, ATI-1918628 - Super Damper/balancer, Lot's of other stuff.
2010 Cadillac Escalade: Daily Driver and pulls my 18' car hauler

Offline digitalsolo

Re: Aston Martin V8 Vantage
« Reply #529 on: October 30, 2024, 08:56:03 AM »
So, I've been out of town the past few weekends for martial arts stuff, but that's settling down, so back to progress on the Aston.

First up, my new, new microcontroller for the dash/etc. came in.  It's just a faster version of the Teensy, which was "version 2" of the hardware.   Good news is it's super compact.  I assembled the CAN transceiver, voltage controller and wired it all into my CAN harness.   I need to update the modules in my code again to work with the newest version (this one is 600 mhz vs. 150 mhz and has a bunch more capability), but the core of the code should stay the same.   I did get to verify that the tachometer works properly with the (v2) controller in place, but temp doesn't.  I know my temp output, so it must be what I'm reading from the GM side.  Easy enough to fix.  I need to get speedometer working too.

On the "half-shafts fell off" side, I ordered a C5 Z06 halfshaft to look at what the tulip side looks like, but it's shorter (the tulip that seats into the diff), so that's no help.  I do want to see what it looks like internally though, I'll tear it apart this weekend.   I have another C6 Z06 half-shaft en route now.  My plan right now is as follows:

1. Clean up the inner tulip and assemble without inner boot
2. Remove coilover from suspension, and install half-shaft
3. Cycle suspension and measure movement of inner tulip

I suspect it just gets a tiny bit too far out in certain positions (aka my axle shafts are slightly too short).   If so, I have a "plan B" that isn't "buy new 1500 dollar shafts".   Time will tell if it's stupid or not, haha.   Plan B is to cut the last inch off my spare donor "tulip" and weld it to the existing tulip.   That will certainly weaken the very edge of the tulip, but it really only needs to provide a little more "throw" for the inner tripod under certain circumstances and would never be putting full load in the welded/added area (since 2/3 tripod bearings would always be in the "original" part of the tulip).

I'll see how the suspension movement impacts location though, and will go from there.  Worst case scenario there is another option with a company that makes custom inner stubs that bolt on Porsche CVs and might work for a customized setup, but we'll worry about that when we get there.   I can also shift the drivetrain forward 1/4", which might help a TINY bit, but won't likely solve the whole issue.

Unrelated I'm putting together parts to rebuild the harness for the engine with a mil-spec setup, so that will probably be another winter project.
Blake MF'ing McBride
1988 Mazda RX7 - Turbo LS1/T56/ProEFI/8.8/Not Slow...   sold.
1965 Mustang Coupe - TT Coyote, TR6060, modern brakes/suspension...
2007 Aston Martin V8 Vantage - Gen V LT4/TR6060, upper/lower pullies, headers, tune.
2021 Tesla Model 3 Performance - Stock...ish.

Offline shainiac

Re: Aston Martin V8 Vantage
« Reply #530 on: October 30, 2024, 12:55:27 PM »
Do you have enough spline engagement to just throw a spacer between the outer CV and the hub in the wheel bearing? It'd act similar to what lower BMW guys do by adding a spacer between the diff hub and the inner CV for lowered cars that have the same issue.
'88 TII -  Rods/Pistons LS3, Twin G30-770s, MaxxECU Pro/PDM
BMW DCT Swap, Ronin 8.8" IRS

Offline digitalsolo

Re: Aston Martin V8 Vantage
« Reply #531 on: October 30, 2024, 03:11:27 PM »
Hmm, fair call.  I have a fair bit of engagement on that side.   That is certainly easier.
Blake MF'ing McBride
1988 Mazda RX7 - Turbo LS1/T56/ProEFI/8.8/Not Slow...   sold.
1965 Mustang Coupe - TT Coyote, TR6060, modern brakes/suspension...
2007 Aston Martin V8 Vantage - Gen V LT4/TR6060, upper/lower pullies, headers, tune.
2021 Tesla Model 3 Performance - Stock...ish.

Offline digitalsolo

Re: Aston Martin V8 Vantage
« Reply #532 on: November 01, 2024, 05:44:38 PM »
Pulled apart C5 Z06 and C6 Z06 CVs.   C5 Z06 has a 6 ball "CV" style inner, which also has plunge and uses a snap ring to prevent it pulling out.  C6 Z06 has a tripod setup instead.   The C5 setup is about 1" shorter (the "tulip" side) and has a coarser spline with similar diameter.

Random fun facts.   I have a lot of CV bits now, haha.  I cleaned up the existing axle I had and a tulip and will do the mock up of the shaft this weekend and see what solution solves my issue.  I'm optimistic this will be annoying, but solvable.  At least these Vette shafts are dirt cheap, particularly with torn boots, etc.
Blake MF'ing McBride
1988 Mazda RX7 - Turbo LS1/T56/ProEFI/8.8/Not Slow...   sold.
1965 Mustang Coupe - TT Coyote, TR6060, modern brakes/suspension...
2007 Aston Martin V8 Vantage - Gen V LT4/TR6060, upper/lower pullies, headers, tune.
2021 Tesla Model 3 Performance - Stock...ish.

Offline digitalsolo

Re: Aston Martin V8 Vantage
« Reply #533 on: November 03, 2024, 08:33:34 PM »
So, I figured out a bunch this weekend.

The good news.   Well the good news is I figured out a bunch.   That's about it.

The bad news.  When I measured these shafts, I made an assumption.  That assumption was, the maximum point of extension was full droop.   Fun fact.  That is exactly wrong.  Maximum compression of the shaft is full droop.  That's not great news.

I built a custom "tulip" out of two donors and the shaft actually runs really nice in it, and it all lines up dead true and runs great.  And I don't trust it one bit with a welded joint.  It'll fail at some point and strand me.   Maybe with 350 HP I'd try it, but I'm not trying it with 700 RWHP/TQ.

I mean, the good news is I have an excellent set of example axles to build the new ones off of, I guess.   That was an expensive assumption.   Anyway, I'm going to tear both sides back apart, make an "adjustable shaft" out of my original welded together mock up, clean all the grease out of all of it, and mock it back up, on each side, and run through the full travel with the adjustable shaft until it's perfect.

Oh well, it's only money, right?  Right?   :P
Blake MF'ing McBride
1988 Mazda RX7 - Turbo LS1/T56/ProEFI/8.8/Not Slow...   sold.
1965 Mustang Coupe - TT Coyote, TR6060, modern brakes/suspension...
2007 Aston Martin V8 Vantage - Gen V LT4/TR6060, upper/lower pullies, headers, tune.
2021 Tesla Model 3 Performance - Stock...ish.

Offline Cobranut

Re: Aston Martin V8 Vantage
« Reply #534 on: November 03, 2024, 11:12:53 PM »
So, I figured out a bunch this weekend.

The good news.   Well the good news is I figured out a bunch.   That's about it.

The bad news.  When I measured these shafts, I made an assumption.  That assumption was, the maximum point of extension was full droop.   Fun fact.  That is exactly wrong.  Maximum compression of the shaft is full droop.  That's not great news.

I built a custom "tulip" out of two donors and the shaft actually runs really nice in it, and it all lines up dead true and runs great.  And I don't trust it one bit with a welded joint.  It'll fail at some point and strand me.   Maybe with 350 HP I'd try it, but I'm not trying it with 700 RWHP/TQ.

I mean, the good news is I have an excellent set of example axles to build the new ones off of, I guess.   That was an expensive assumption.   Anyway, I'm going to tear both sides back apart, make an "adjustable shaft" out of my original welded together mock up, clean all the grease out of all of it, and mock it back up, on each side, and run through the full travel with the adjustable shaft until it's perfect.

Oh well, it's only money, right?  Right?   :P

Damn, Aston kind of gotcha there.  :banghead:

Maybe this is a good time to narrow the rear and add some mini-tubs?  :poke: :poke: :chug:
1995 FD, 7.0 Liter stroked LS3, T56, 8.8, Samberg kit.

Offline MPbdy

Re: Aston Martin V8 Vantage
« Reply #535 on: November 04, 2024, 12:22:15 AM »
Damn that's brutal!  At least you figured it out.

Offline shainiac

Re: Aston Martin V8 Vantage
« Reply #536 on: November 04, 2024, 07:50:41 AM »
That's brutal. At least you might get a price brakes on axle set #2 if the shop saved the cutting profile from the first set!
'88 TII -  Rods/Pistons LS3, Twin G30-770s, MaxxECU Pro/PDM
BMW DCT Swap, Ronin 8.8" IRS

Offline digitalsolo

Re: Aston Martin V8 Vantage
« Reply #537 on: November 04, 2024, 09:24:23 AM »
Haha, yeah, big old oops.   In my martial arts training, they have a saying "Sometimes you win, and sometimes you learn".   This was a learn.  LOL.   Oh well, it's still cheaper than paying a shop to do this stuff, and you can guarantee I'll never make that mistake again (should I ever need to measure axles again).

I may or may not use the same shop, mostly because it took them 12 weeks to build these.  I suppose I'm not in a big hurry with winter and all though, and they did nice work, so perhaps the timeline doesn't matter.
Blake MF'ing McBride
1988 Mazda RX7 - Turbo LS1/T56/ProEFI/8.8/Not Slow...   sold.
1965 Mustang Coupe - TT Coyote, TR6060, modern brakes/suspension...
2007 Aston Martin V8 Vantage - Gen V LT4/TR6060, upper/lower pullies, headers, tune.
2021 Tesla Model 3 Performance - Stock...ish.

Offline shainiac

Re: Aston Martin V8 Vantage
« Reply #538 on: November 04, 2024, 11:17:38 AM »
I talked to a guy who's building Super 8.8" IRS kits for Z-cars and he uses this shop. I'm not sure how flexible or fast they are, but might be worth asking. IIRC, it was under $1k for a pair, but he's also ordering multiple sets at a time.

https://summersbrothersracing.com/
'88 TII -  Rods/Pistons LS3, Twin G30-770s, MaxxECU Pro/PDM
BMW DCT Swap, Ronin 8.8" IRS

Offline digitalsolo

Re: Aston Martin V8 Vantage
« Reply #539 on: November 04, 2024, 04:47:09 PM »
I will add them to my "Talk to these guys" list.   I'm looking at Dutchman, CVJ, Branik (my local guys) and I'll put Summers on that docket as well.  Going to get them measured this coming weekend so that I know 100% what I need, and then start checking with places.   My current "guess" is I'm ~1.75" too short.   We'll see how close I am.   I added 1.75" to the tulips and it works great, so "in theory" the axles need the same, but I want to be sure my "plunge" isn't too aggressive.
Blake MF'ing McBride
1988 Mazda RX7 - Turbo LS1/T56/ProEFI/8.8/Not Slow...   sold.
1965 Mustang Coupe - TT Coyote, TR6060, modern brakes/suspension...
2007 Aston Martin V8 Vantage - Gen V LT4/TR6060, upper/lower pullies, headers, tune.
2021 Tesla Model 3 Performance - Stock...ish.