lz9 3900 V6 buildup
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Re: lz9 3900 V6 buildup
Sorry to read that shaun. that sucks.
I actually just did a starter change a few weeks ago because it was starting to strip the gears but that looks pretty bad!
I actually just did a starter change a few weeks ago because it was starting to strip the gears but that looks pretty bad!
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Re: lz9 3900 V6 buildup
Ring gear not concentric with the flywheel? Ring gear out of round? Not enough clearance between starter gear and ring gear? How does the starter gear look now? Any play in the starter gear?
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Re: lz9 3900 V6 buildup
backfire while starting?
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Re: lz9 3900 V6 buildup
Ignition timing during cranking can have an effect on this... also ignition timing during cranking is not necessarily super-accurate, because the speed of the crankshaft is not constant.
On my own car, I changed the commanded cranking timing from 10° BTDC to 5° BTDC, and that reduced the feeling of the engine hitting a wall when it fired.
- Shaun41178(2)
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Re: lz9 3900 V6 buildup
Replaced the flywheel with a standard steel autozone one. Also replaced the starter as it was bad.
I think the starter went bad which broke the teeth on the flywheel. I put it all back togethor with the same starter and it was still making twrrible noises when trying to start. Swapped the starter and all is well.
I gotta bleed the coolant system and clean up but otherwise its road worthy
I emailed spec several days ago if they sold a ring gear replacement and have not heard anything back
I think the starter went bad which broke the teeth on the flywheel. I put it all back togethor with the same starter and it was still making twrrible noises when trying to start. Swapped the starter and all is well.
I gotta bleed the coolant system and clean up but otherwise its road worthy
I emailed spec several days ago if they sold a ring gear replacement and have not heard anything back
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- Peer Mediator
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Re: lz9 3900 V6 buildup
Great to hear you got to the bottom of it.Shaun41178(2) wrote: ↑Sat Aug 14, 2021 7:52 pm Replaced the flywheel with a standard steel autozone one. Also replaced the starter as it was bad.
I think the starter went bad which broke the teeth on the flywheel. I put it all back togethor with the same starter and it was still making twrrible noises when trying to start. Swapped the starter and all is well.
I gotta bleed the coolant system and clean up but otherwise its road worthy
Spec? What do they know about GM FWD ring gears?Shaun41178(2) wrote: ↑Sat Aug 14, 2021 7:52 pm I emailed spec several days ago if they sold a ring gear replacement and have not heard anything back
Pioneer FRG-142W. Steve at PTT told Pioneer is literally the only company that makes them.
- Shaun41178(2)
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Re: lz9 3900 V6 buildup
The ring gear on the spec is different from every stock ring gear I have seen. Its been mqchined or cast differently than every online pic I have found of a ring gear.
I'll have to take a pic to show what I mean
I'll have to take a pic to show what I mean
- Shaun41178(2)
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Re: lz9 3900 V6 buildup
Finally doing a heat exchanger. Mocked up
26x7 inches.
26x7 inches.
Re: lz9 3900 V6 buildup
Thumbs up on the heat exchanger
- Shaun41178(2)
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Re: lz9 3900 V6 buildup
Got it mounted. Drilled some 5 inch holes in the trunk in hopes some air will pass through.
Re: lz9 3900 V6 buildup
Put some small fans on it like from a transmission cooler.
- Shaun41178(2)
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Re: lz9 3900 V6 buildup
Did a test tonight. Decklid is on. I drove normally and iats did rise 10 degrees higher than when engine was cold.
Turbo setup is radiating a bunch of heat into the trunk area and the heat exchanger isnt working as best it could.
I'll do another test with the decklid off and see if temps stay cooler.
Turbo setup is radiating a bunch of heat into the trunk area and the heat exchanger isnt working as best it could.
I'll do another test with the decklid off and see if temps stay cooler.
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- Peer Mediator
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Re: lz9 3900 V6 buildup
Well your trunk is full of turbo hot side...
Maybe baffle or duct inside your trunk to get fresh air down to the HEX?
Maybe baffle or duct inside your trunk to get fresh air down to the HEX?
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Re: lz9 3900 V6 buildup
What are your IAT readings in relation to ambient temp when just cruising around?
- Shaun41178(2)
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Re: lz9 3900 V6 buildup
Abput 10 degrees higher than ambient
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Re: lz9 3900 V6 buildup
I'm getting that with mine mounted up front.
What’s rise during and recovery after a pull like?
- Shaun41178(2)
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Re: lz9 3900 V6 buildup
I checked my logs. I did a 1.8 second pull in 4th gear. I started at 3200 rpm and shutdown at 4500 rpm.
Boost maxed at 22.5 lbs.
Iat started at 69 degrees F. Rose to 76 degrees but that temp was well after i let off. Took about 36 seconds after rising to 76F to come back to 71 degrees Iat..
Boost maxed at 22.5 lbs.
Iat started at 69 degrees F. Rose to 76 degrees but that temp was well after i let off. Took about 36 seconds after rising to 76F to come back to 71 degrees Iat..
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Re: lz9 3900 V6 buildup
NiceShaun41178(2) wrote: ↑Wed Nov 10, 2021 8:42 pm I checked my logs. I did a 1.8 second pull in 4th gear. I started at 3200 rpm and shutdown at 4500 rpm.
Boost maxed at 22.5 lbs.
Iat started at 69 degrees F. Rose to 76 degrees but that temp was well after i let off. Took about 36 seconds after rising to 76F to come back to 71 degrees Iat..
temperature sensors, especially air, are notoriously slow to react.
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Re: lz9 3900 V6 buildup
Tall order but, can you make it do that with the bumper cover?Shaun41178(2) wrote: ↑Wed Nov 10, 2021 8:42 pm I checked my logs. I did a 1.8 second pull in 4th gear. I started at 3200 rpm and shutdown at 4500 rpm.
Boost maxed at 22.5 lbs.
Iat started at 69 degrees F. Rose to 76 degrees but that temp was well after i let off. Took about 36 seconds after rising to 76F to come back to 71 degrees Iat..
- Shaun41178(2)
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Re: lz9 3900 V6 buildup
I do plan to put the bumper back on soon actually.
I did another test tonight. Temps might have been lower 60s. Did a 3rd and 4th gear pull. This time I took the decklid off to help get hot air out of the trunk.
Temp started at 71 and rose to 79 when I let off in 4th.
I checked trunk temps when I got back and they were the same. I checked the turbo comp housing and it was reading 118 degrees. I didnt have a reading when the decklid was on.
Obviously with the decklid off temps around the turbo will be cooler. But the rear trunk wall and the heat exchanger seemed to be about the same temp as with the decklid on. The radiant heat from the downpipe is still getting it hot.
I should reroute the downpipe to exit out the decklid instead of down low where the heat exchanger is at
I did another test tonight. Temps might have been lower 60s. Did a 3rd and 4th gear pull. This time I took the decklid off to help get hot air out of the trunk.
Temp started at 71 and rose to 79 when I let off in 4th.
I checked trunk temps when I got back and they were the same. I checked the turbo comp housing and it was reading 118 degrees. I didnt have a reading when the decklid was on.
Obviously with the decklid off temps around the turbo will be cooler. But the rear trunk wall and the heat exchanger seemed to be about the same temp as with the decklid on. The radiant heat from the downpipe is still getting it hot.
I should reroute the downpipe to exit out the decklid instead of down low where the heat exchanger is at