ZR-1 Net Registry Forums - View Single Post

WVZR-1 · 10-11-2016

Do a drive in 4th (4th 1:00 ratio) gear and record speeds at a few different RPM - try 1000, 1200, 1500, 1700 and 2000. Maybe just use 3 or 4 of those.

Now maybe do the same drives using the SPEEDO at 40, 50, 60 and 70 and record the RPM display. If you have a GPS maybe record also the GPS display at those speeds and the effective calibration of the DRA/ERA could be determined.

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Using a 3.73 and a tire diameter just a little short of the advertised 25.68 I might expect

1000 - 20+, 1200 - 25-, 1500 - 30+, 1700 - 34+, 2000 - 41-, 3000 - 61+, 4000 - 82

I used a calculator that I've used before for just random comparisons. I did no math but I believe I have in the past. I didn't use a calculator to go MPH to RPM, didn't figure it necessary if you do the TACH to MPH display and the MPH display to GPS.

** I didn't take into consideration that I believe the ZR-1 TACH is 1K, 1500 and 2K incrementally so you might just do those three and I stretched the expected to 3K and 4K.

You could use the C68 display to confirm the cluster tach operation OR a scanner

10-11-2016	#7
WVZR-1 Join Date: Oct 2004 Posts: 1,889	Re: 6th gear shakes ? Do a drive in 4th (4th 1:00 ratio) gear and record speeds at a few different RPM - try 1000, 1200, 1500, 1700 and 2000. Maybe just use 3 or 4 of those. Now maybe do the same drives using the SPEEDO at 40, 50, 60 and 70 and record the RPM display. If you have a GPS maybe record also the GPS display at those speeds and the effective calibration of the DRA/ERA could be determined. ************ Using a 3.73 and a tire diameter just a little short of the advertised 25.68 I might expect 1000 - 20+, 1200 - 25-, 1500 - 30+, 1700 - 34+, 2000 - 41-, 3000 - 61+, 4000 - 82 I used a calculator that I've used before for just random comparisons. I did no math but I believe I have in the past. I didn't use a calculator to go MPH to RPM, didn't figure it necessary if you do the TACH to MPH display and the MPH display to GPS. I didn't take into consideration that I believe the ZR-1 TACH is 1K, 1500 and 2K incrementally so you might just do those three and I stretched the expected to 3K and 4K. You could use the C68 display to confirm the cluster tach operation OR a scanner Last edited by WVZR-1; 10-11-2016 at 03:23 PM.