Can someone explain how the speed adjustment works?

azn_boi · Post by **azn_boi** » Mon Dec 06, 2010 3:43 pm

as the title says?

I've tried everything and the speed adjustment doesn't adjust to the actual speed after installing diff size tires or even FD!~

Post by **Spunkster** » Mon Dec 06, 2010 4:32 pm

You will only see the adjustment in the datalogs, and not on your cluster.

ajpturbopittsburgh · Post by **ajpturbopittsburgh** » Mon Dec 06, 2010 9:07 pm

Spunkster wrote:You will only see the adjustment in the datalogs, and not on your cluster.

Wait, I don't understand that?

What about the 2 boxes under SENSORS under the calibration tab that says speed adjustment to the ECU and speed adjustment to DASH as a percentage?

If you adjusted it to the dash why would you only see it in a datalog?

Post by **Spunkster** » Tue Dec 07, 2010 10:19 am

What vehicle are you referring to?

azn_boi · Post by **azn_boi** » Tue Dec 07, 2010 11:44 am

I see that too..
and I have my flashpro hooked up for civic si (FG/FD)

azn_boi · Post by **azn_boi** » Thu Dec 09, 2010 12:07 pm

so i guess the speedad justment doesn't work since no site admin really could explain this situation?

Post by **Hondata** » Thu Dec 09, 2010 4:28 pm

What vehicle are you referring to?

ajpturbopittsburgh · Post by **ajpturbopittsburgh** » Fri Dec 10, 2010 11:08 am

Spunkster wrote:What vehicle are you referring to?

I have a 2008 Si Sedan. I thought the other guy said he had an si fg/fd

Other than that I'm not sure what you mean?

So does the speedo adjustment work?

I have a set of wheels and tires that are .7 percent larger in total diameter to stock, so when I go and put them on I was going to adjust both the adjustment to the dash and the ECU by .7 percent.

Is that correct or do I just change the speed to the ecu and it will take care of the rest?....I'm not sure.

Post by **Hondata** » Sat Dec 11, 2010 10:52 am

For the Si when there are adjustments for both the dash speed and the ECU speed. If your speedometer reads 10% under then setting the correction to 10% should fix it. If your tires diameter is 0.7% larger than stock then you'll want to put in 0.7% to correct it.

The S2000 works differently, and the speedometer is not driven by the ECU, and cannot be adjusted.

ajpturbopittsburgh · Post by **ajpturbopittsburgh** » Sat Dec 11, 2010 11:42 am

This seems more confusing you n it needs to be. Are you sure that is correct?

You say if the tire diameter is .7 percent larger than you need to put -.7 percent in the adjustment to the dash only? But when you have a larger tire the speedo should be reading slower than you are actually going so wouldn't you need to go plus .7 percent to the speedo and the same for the ecu adjustment so it doens't give a false reading for the electronics and clutch slippage for the cruise?

Alternatively when you have little wheels and tires the speedo reads faster so wouldn't you then have to subtract for the ECU and dash adjustment i.e. negative values?

I'm having a hard time understanding whether to adjust both or just one or the other....So for a simple tire and wheel swap, once you figure the change in diameter as a percentage, do you change one or both of the boxes?

Post by **Hondata** » Mon Dec 13, 2010 12:12 pm

Yes, you're right. Larger tires would require the adjustment to be positive.

azn_boi · Post by **azn_boi** » Mon Dec 13, 2010 12:27 pm

Sorry.. yes I have a 4 door SI!!

I have a bit smaller size tires but with a Type R tranny...

ajpturbopittsburgh · Post by **ajpturbopittsburgh** » Thu Dec 16, 2010 4:58 pm

For the civic si can you give an example when you would adjust the both the dash and the ecu adjustment and when would you only adjust one or the other?

mucter · Post by **mucter** » Fri Dec 17, 2010 1:49 am

Something like seems it'd be really easy to get past with a little trial and error. Just have a buddy drive alongside you on the freeway at 60mph, datalog, look at your dash. Then take note of what the dash says. Go back to your datalog and see what it says. Make and adjustment in your cal and then go back and do it again. See what the result is and adjust again. Not complicated, just a little bit of time.

ajpturbopittsburgh · Post by **ajpturbopittsburgh** » Fri Dec 17, 2010 3:47 pm

^ Ok well it shouldn't require a trial and error type of method to determine which boxes to change when doing a tire and wheel swap. Just wanted a clear cut answer from the software creators on when to adjust one or both boxes.

I have an sct tuner and it takes the guess work out of it and simply asks you how many revs per mile your particular tire does and it takes care of the rest.....That would be pretty sweet.