post-swap tachometer accuracy

[scudweiser]

in an H-swapped CB7, is the factory tach going to be accurate? i have heard his question answered "yes", "no" and varying degrees of "um, sort of".

lets put this to rest once and for all, i installed an aftermarket tach and there seems to be a difference of about 500 rpm at around 5000 rpm and above on either tach (so now i not sure which ones truthful)

can anybody shed light on this without simply speculating? perhaps someone who has dyno'd cars a lot can confirm or deny that there is a difference between actual RPM and whats registered on the stock tach?

[scudweiser]

bump... anyone? beuler?

[93F22A6]

You could always get the calc out and crunch some numbers and figure it out by how fast you going. Have fun with that though, not to sure if it's off or not but it would be a good thing to know. You could judge it off your VTEC engagement.

[scudweiser]

yea, vtec seems to hit at about 5.75k on the stock tach, but 5.2 on the aftermarket one

[Flatline]

Mine hits at 5200 on my stock tach.

[Losiracer2]

Mine hits right at 5100 on my BB6 cluster, but I've got an Auto H22 trans & ECU so idk if thats diff or not.

[scudweiser]

the votes are in, my stock tach is fucking ghey

[C91BLX7]

the votes are in, my stock tach is fucking ghey

Or the aftermarket one is fucking with it?

[Flatline]

it could also be that your oil pressure is different in the times you tried to hit VTEC and it didn't engage until 5750 because it didn't have enough oil pressure.

Im kinda just throwing thins out there.