Hi,

After trying to fix my tach by resoldering the connections I think I have put the needle on incorrectly. I have read a post to remove the bottom stop pin and make the needle point to about -1500RPM but it still seems to read a bit low. After posting for a method to calibrate the tach properly, I think the remaining way would be to see how far off my tach is to other owners.

Could you please post your RPM at 50MPH or any other speed you mighy fancy

Thanks

 

This will be different in every FD based on mods but to help you narrow it down.

50 mph, 4th gear, RPM is about 26-2800 in cruising.

 

80mph in 5th is almost exactly 3000rpm

 

Went for a drive and 80mph is 3100 RPM for me

 

80mph in 5th is 2700 for me

 

160mph in first is blown motor for me.

 

what? this makes no sense to me. If both cars have stock 4.10 gears and stock tire size or a almost equal diameter then how can rpm at a certain mph be different? explain

 

Are you running smaller diameter wheels/tires or something? That is WAY off.

 

maybe its a fast auto?

 

3050rpm according to my PFC is exactly 80mph. Do the math and I come up with 1906 rpm for 50mph in 5th. Haven't driven my car in a while, so I can't check it, but the numbers you guys are quoting seem to be a bit different... hmm?

EDIT: actually come to think of it this makes sense. The difference I quoted above is 30mph/1144rpm. And we all know the FD is capable of just over 200mph with stock gearing, so with 30mph/1144rpm, at 8000rpm you end up with a theoretical top speed of 209mph, which is just about right.

Long story short, 50mph in 5th should be ~1900 rpm.

 

That's why I said it would be different due to mods. Not everyone here has stock gears or tire size. And seeing as how he never listed any of the above, me posting my RPM should be taken with that into account.

I know Jack and Tom do not have the same RPM in 5th gear at 80mph. They both have stock wheels and tranny. Right? they are within 3-400 though.

 

Hi,

thanks guys. At the moment I am getting 1700RPM at 50MPh in 5th

I will try to adjust it to 3050 at 80MPH.

Thanks again.

Trevor