Speedo dead - need tach readings - LotusTalk

TrapperJohn · 06-08-2009, 10:15 AM

My speedo in my 90 SE is officially bonkers.

Until I get it fixed, could some kind soul with a similar vintage Esprit get me the tach readings in 5th gear for 55 and 70 mph. I think it's 2300 and 3000 RPM, but want to be sure.

Simba · 06-08-2009, 01:05 PM

Going from memory, but I believe it's around 2,500 at ~55, and 3,300 at ~70. (V8, fwiw, but I think the ratios are the same) I'll see if I can verify that later.

Vulcan Grey · 06-08-2009, 06:09 PM

the V8 ratios aren't the same.
I seriously don't remember what RPM's my Esprit runs in any gears... but LEW knows

Esprit Models
Ratios: Gear Ratio km/h/1000rpm
5th 0.82:1 37.2
4th 1.03:1 29.6
3rd 1.38:1 22.0
2nd 2.05:1 14.9
1st 3.36:1 9.0

so the math works out to 2379rpm at 55 in 5th
and 3029rpm at 70 in 5th

TrapperJohn · 06-09-2009, 06:36 AM

Thanks, guys. I need to get that speedo fixed, tired of seeing that gaping hole.

Quicker · 06-09-2009, 07:53 AM

What's your speedo doing?

I just fixed mine - it was bouncing all over then stopped..... had to take it all apart, glued the rotating weight back onto the end of the drive.

TrapperJohn · 06-10-2009, 12:08 PM

With mine, the delrin bushing that held the two pins in alignment (one on the rotating magnet, one on the cup) came apart. The tin cup was hitting the magnet, causing the needle to jerk all over the place.

I'm experimenting with a glob of epoxy to replace the bushing. Have to taper the countersink just right.

Lorenzo · 06-15-2009, 01:25 PM

Hello everyone, This may be my 1st post here. Can't actually recall.... any way, I have a 93.5 that had a bouncy speed needle then it just stopped,

Lou Senko, Austin, TX wrote " I just fixed mine - it was bouncing all over then stopped..... had to take it all apart, glued the rotating weight back onto the end of the drive".

Hi Lou, have any pictures of your fix-it or the steps taken. I looked at the unit a while back but looks to be a sealed unit ... so how did you open it?

Actually like to know how fast I'm going.

Thanks,

Larry

Quicker · 06-15-2009, 01:39 PM

here is what I needed to fix - you can see the rotating magnet worked its way up (and nearly off) the rotating drive. I put a drop of loc-tite on it and pressed it flush.

Lorenzo · 06-15-2009, 04:11 PM

Have any problems getting the bezel off? It looks like the edges are rolled.

TimMullen · 06-15-2009, 04:34 PM

Quote:

Originally Posted by Lorenzo

Have any problems getting the bezel off? It looks like the edges are rolled.

Don't know about the Esprit, but for my earlier instruments, you simply rotate the bezel on the instrument housing and it comes off.

Quicker · 06-15-2009, 06:12 PM

Quote:

Originally Posted by Lorenzo

Have any problems getting the bezel off? It looks like the edges are rolled.

it is rolled - I just used a small (jeweler's) screw driver and worked it around the edges.

Lotus_cz · 06-17-2009, 08:35 AM

if any1 interested i ve one digital 80mm spare

06-08-2009, 10:15 AM	#1 (permalink)
TrapperJohn Registered User Join Date: Mar 2009 Posts: 93	Speedo dead - need tach readings My speedo in my 90 SE is officially bonkers. Until I get it fixed, could some kind soul with a similar vintage Esprit get me the tach readings in 5th gear for 55 and 70 mph. I think it's 2300 and 3000 RPM, but want to be sure.

06-08-2009, 06:09 PM	#3 (permalink)
Vulcan Grey Registered User Join Date: Jul 2006 Location: Colorado USA Posts: 295	the V8 ratios aren't the same. I seriously don't remember what RPM's my Esprit runs in any gears... but LEW knows Esprit Models Ratios: Gear Ratio km/h/1000rpm 5th 0.82:1 37.2 4th 1.03:1 29.6 3rd 1.38:1 22.0 2nd 2.05:1 14.9 1st 3.36:1 9.0 so the math works out to 2379rpm at 55 in 5th and 3029rpm at 70 in 5th __________________ Travis Vulcan Grey Esprit SE http://vulcangrey.lotuscolorado.com/gallery Last edited by Vulcan Grey : 06-08-2009 at 06:14 PM.

06-09-2009, 07:53 AM	#5 (permalink)
Quicker 89 Esprit SE Join Date: Jan 2008 Location: Austin, TX Posts: 59	What's your speedo doing? I just fixed mine - it was bouncing all over then stopped..... had to take it all apart, glued the rotating weight back onto the end of the drive. __________________ _____________ Lou Senko, Austin, TX Click to see 'Quik LS' my mean Lincoln LS Click to see 'Quiker' my Lotus Esprit SE

06-15-2009, 01:25 PM	#7 (permalink)
Lorenzo Registered User Join Date: Sep 2008 Location: Brentwood, CA Posts: 2	Speedo repair procedure Hello everyone, This may be my 1st post here. Can't actually recall.... any way, I have a 93.5 that had a bouncy speed needle then it just stopped, Lou Senko, Austin, TX wrote " I just fixed mine - it was bouncing all over then stopped..... had to take it all apart, glued the rotating weight back onto the end of the drive". Hi Lou, have any pictures of your fix-it or the steps taken. I looked at the unit a while back but looks to be a sealed unit ... so how did you open it? Actually like to know how fast I'm going. Thanks, Larry __________________ Drive Well - Lorenzo!

06-15-2009, 01:39 PM	#8 (permalink)
Quicker 89 Esprit SE Join Date: Jan 2008 Location: Austin, TX Posts: 59	here is what I needed to fix - you can see the rotating magnet worked its way up (and nearly off) the rotating drive. I put a drop of loc-tite on it and pressed it flush. Attached Images __________________ _____________ Lou Senko, Austin, TX Click to see 'Quik LS' my mean Lincoln LS Click to see 'Quiker' my Lotus Esprit SE

06-08-2009, 01:05 PM	#2 (permalink)
Simba 2/3 hp to the paws. Join Date: Jan 2008 Location: NY Posts: 497	Going from memory, but I believe it's around 2,500 at ~55, and 3,300 at ~70. (V8, fwiw, but I think the ratios are the same) I'll see if I can verify that later.

06-09-2009, 06:36 AM	#4 (permalink)
TrapperJohn Registered User Join Date: Mar 2009 Posts: 93	Thanks, guys. I need to get that speedo fixed, tired of seeing that gaping hole.

06-10-2009, 12:08 PM	#6 (permalink)
TrapperJohn Registered User Join Date: Mar 2009 Posts: 93	With mine, the delrin bushing that held the two pins in alignment (one on the rotating magnet, one on the cup) came apart. The tin cup was hitting the magnet, causing the needle to jerk all over the place. I'm experimenting with a glob of epoxy to replace the bushing. Have to taper the countersink just right.

06-15-2009, 04:11 PM	#9 (permalink)
Lorenzo Registered User Join Date: Sep 2008 Location: Brentwood, CA Posts: 2	Have any problems getting the bezel off? It looks like the edges are rolled. __________________ Drive Well - Lorenzo!

06-17-2009, 08:35 AM	#12 (permalink)
Lotus_cz Registered User Join Date: May 2009 Location: Prague,CZ Posts: 22	if any1 interested i ve one digital 80mm spare __________________ http://www.lotus-club.cz Your 6 is my 12. http://www.voodoo-world.cz --------------------------------

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