Speedometer delayed......
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TECH Addict
Joined: Dec 2010
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From: Maricopa, AZ
A little update on this. I replaced the Alternator and while the engine runs smoother the speedometer is still delayed. But, now it'll lag until I hit about 6K RPMs (maybe a bit higher) then JUMP to 7K RPMs and the speedometer will match that jump. Weird. Sounds like a voltage issue.
I'll get a video of it one of these days when it's safe to do it and I won't get in trouble for it. It does this in all gear when I take it to redline (well, first to third anyway I haven't redlined 4th or higher, LOL).
I'll get a video of it one of these days when it's safe to do it and I won't get in trouble for it. It does this in all gear when I take it to redline (well, first to third anyway I haven't redlined 4th or higher, LOL).
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Joined: Sep 2014
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From: Fort Wayne, IN
I doubt it because it keeps up fine in my data logs. 1-2 shifts happen at 51-53 mph in my data log. But my speedo says 45ish. When my wife was reading the data log and GPS for me I was driving nice. I never throttled it.
She doesn't like it when I drive like an idiot, she broke her back a while ago so it hurts her when I drive aggressively. So I avoid it with her in the car. My kids though, they LOVE it!
Maybe I should pull my IP cluster and replace it with a tablet screen and Tuner Pro RT Dash mode........
She doesn't like it when I drive like an idiot, she broke her back a while ago so it hurts her when I drive aggressively. So I avoid it with her in the car. My kids though, they LOVE it!
Maybe I should pull my IP cluster and replace it with a tablet screen and Tuner Pro RT Dash mode........
Here is a video of my speedometer and it doesn't keep up. After you let off it keeps going up another 5mph or so. https://ls1tech.com/forums/lt1-lt4-m...l#post18820382
Thread Starter
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From: Maricopa, AZ
What rear end ratio are you running and tire height?
Here is a video of my speedometer and it doesn't keep up. After you let off it keeps going up another 5mph or so. https://ls1tech.com/forums/lt1-lt4-m...l#post18820382
Here is a video of my speedometer and it doesn't keep up. After you let off it keeps going up another 5mph or so. https://ls1tech.com/forums/lt1-lt4-m...l#post18820382
Thread Starter
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From: Maricopa, AZ
Here's that video. You can see it's delayed, then jumps. 1st gear at redline (6700rpms) tops at 56mph, 2nd 83mph. You can see in the video second jumps to 83-84mph at under 7k rpms. The jump started after I installed a new 140 amp alternator. DA was at 3475ft during this run, gotta love dragtimes app! I never hit the Limiter, but I'm sure I got close. No data log for this run to confirm though. It was also on an up hill on ramp.
The last 2 seconds of the video I'm on the brakes and slowing down (after I let of the gas I went to the brake), but the speedometer didn't show this until right before the video ends.
I also notice when the gauges jump the volt gauge drops into the red. Belt slip maybe?
On a side note, you can see my traction issues in first.
The last 2 seconds of the video I'm on the brakes and slowing down (after I let of the gas I went to the brake), but the speedometer didn't show this until right before the video ends.
I also notice when the gauges jump the volt gauge drops into the red. Belt slip maybe?
On a side note, you can see my traction issues in first.
Last edited by hrcslam; Jun 3, 2015 at 05:33 AM.
Thread Starter
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From: Maricopa, AZ
Speedometer delayed...... I think the jumping issue is related to the voltage drop. I did some research on this and found out my alternator is spinning to about 21k rpms at 6700rpm. All my pulleys are stock. This explains why I chucked my last alternator pulley which is why I have a new alternator.
Stock redline limits the alternator to about 18k rpms. The drop looks to start at just above the stock redline limit or about 18.7k rpms.
I'll try a larger pulley in a month or so and update on that. I'm also going to pull my relay box and clean/inspect all the contacts on the bottom and see if that fixed the delayed issue.
Stock redline limits the alternator to about 18k rpms. The drop looks to start at just above the stock redline limit or about 18.7k rpms.
I'll try a larger pulley in a month or so and update on that. I'm also going to pull my relay box and clean/inspect all the contacts on the bottom and see if that fixed the delayed issue.
Last edited by hrcslam; Jun 4, 2015 at 03:46 AM.
On The Tree
Joined: Nov 2012
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Speedometer delayed...... my car is stock except gears, bolt ons and I get a delay under wot. my last data log showed my peak speed of 90 when my speedo only read 70-75. It gets worse with speed too, my wot overdrive shift only reads 90 ish on my speedo but actually more like 120. It's just the nature of the beast I think.
https://ls1tech.com/articles/ride-on...-white-beauty/
^
Congrats on getting featured in an article..however, according to LS1 tech, your car runs mid 14's @ 96MPH 
A misprint I take it?
^
Congrats on getting featured in an article..however, according to LS1 tech, your car runs mid 14's @ 96MPH A misprint I take it? LS1 Tech Stories
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TECH Addict
Joined: Dec 2010
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From: Maricopa, AZ
Speedometer delayed...... https://ls1tech.com/articles/ride-on...-white-beauty/
^ Congrats on getting featured in an article..however, according to LS1 tech, your car runs mid 14's @ 96MPH
A misprint I take it?
^
Congrats on getting featured in an article..however, according to LS1 tech, your car runs mid 14's @ 96MPH A misprint I take it?Yes, bad info there. I had all seasons last time I went to the track (2.097 60 foot), DA over 6200ft, and I suck at launching the manual. But the results were an embarrassing 13.4 at 108 1/4. I forget the 1/8 time and trap, but it was bad. lol
Last edited by hrcslam; Jun 10, 2015 at 02:41 PM.
Thread Starter
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From: Maricopa, AZ
LOL....yesterday it was the first thing anybody saw on the front page of https://ls1tech.com ....still is right now! It kinda makes all LT1s look slow though...
Thread Starter
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From: Maricopa, AZ
Speedometer delayed...... LOL....yesterday it was the first thing anybody saw on the front page of https://ls1tech.com ....still is right now! It kinda makes all LT1s look slow though...
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Joined: Sep 2014
Posts: 321
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From: Fort Wayne, IN
I think the jumping issue is related to the voltage drop. I did some research on this and found out my alternator is spinning to about 21k rpms at 6700rpm. All my pulleys are stock. This explains why I chucked my last alternator pulley which is why I have a new alternator.
Stock redline limits the alternator to about 18k rpms. The drop looks to start at just above the stock redline limit or about 18.7k rpms.
I'll try a larger pulley in a month or so and update on that. I'm also going to pull my relay box and clean/inspect all the contacts on the bottom and see if that fixed the delayed issue.
Stock redline limits the alternator to about 18k rpms. The drop looks to start at just above the stock redline limit or about 18.7k rpms.
I'll try a larger pulley in a month or so and update on that. I'm also going to pull my relay box and clean/inspect all the contacts on the bottom and see if that fixed the delayed issue.
Congrats again, looks like they are stalking your car and and Suburban AGAIN on the front page of LS1tech with yet another article...... 
..... how you get so much attention around here?! https://ls1tech.com/articles/ride-on...2001-suburban/
I'm jelly...
Thread Starter
TECH Addict
Joined: Dec 2010
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From: Maricopa, AZ
Speedometer delayed...... Congrats again, looks like they are stalking your car and and Suburban AGAIN on the front page of LS1tech with yet another article...... ..... how you get so much attention around here?! https://ls1tech.com/articles/ride-on...2001-suburban/
I'm jelly...
Thread Starter
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From: Maricopa, AZ
Update... finally.
So I decided that I would try and replace the VSS. It fixed the delayed issue. I also replaced the battery; I'm not sure what effect that had, but I can start my car more than once now......
I still need an under drive pulley kit to keep the Alternator running over 6K rpms though. But, no more jumping on my gauges between the Battery and VSS replacements. My Voltmeter still drops out over 6K though. Under drive pulley is needed. Hopefully I'll get it done in the next couple months.
Well, to be clear here, I only pulled through 2nd. Not sure if it will keep up through 3rd. I'll find out next time I hit up the track, which could be more than a year.
Nevermind. Spoke too soon. Its still doing it, but not as bad. I'll get that pulley done and report back then. Ugh
So I decided that I would try and replace the VSS. It fixed the delayed issue. I also replaced the battery; I'm not sure what effect that had, but I can start my car more than once now......
I still need an under drive pulley kit to keep the Alternator running over 6K rpms though. But, no more jumping on my gauges between the Battery and VSS replacements. My Voltmeter still drops out over 6K though. Under drive pulley is needed. Hopefully I'll get it done in the next couple months.
Well, to be clear here, I only pulled through 2nd. Not sure if it will keep up through 3rd. I'll find out next time I hit up the track, which could be more than a year.
Nevermind. Spoke too soon. Its still doing it, but not as bad. I'll get that pulley done and report back then. Ugh
Last edited by hrcslam; Jan 17, 2016 at 09:12 PM.
I still need an under drive pulley kit to keep the Alternator running over 6K rpms though. But, no more jumping on my gauges between the Battery and VSS replacements. My Voltmeter still drops out over 6K though. Under drive pulley is needed. Hopefully I'll get it done in the next couple months.
Thread Starter
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From: Maricopa, AZ
Also, I've broken the power steering bolts off at high RPM (I have stronger ones there now), and have damaged 2 A/C pulleys too (Sheared one between the clutch surface area and the belt area on the pulley, galled another one between the clutch and clutch surface of the pulley). Everything points to too much RPM.