problems with the speedo calculator

[goldbergv95]

Hi Im new to this tuner. I have 02 Chevy trailblazer I6 regular. I have 3.42 gear ratios change tires from 245/65/17 to 265/35/22.

Problem is I dont know the drive or the driver sprocket for my trans which is 4l60e. And my Speedo Fine Tuning is all zero. What is the correct calculation? thanks

[roy]

If I am not mistaken , you just have to use the first tab[SPEEDO CALCULATOR] and put in the correct info, hit the calc button, then hit the apply button at the bottom , then save tun, then flash.

[goldbergv95]

its just werid that after i save it when i checkthe speedometer the tire size is again N/A and the gear ratio changed from 3.42 to 3.29. is something wrong with that?

[roy]

Can you post your tun file?

[goldbergv95]

If I am not mistaken , you just have to use the first tab[SPEEDO CALCULATOR] and put in the correct info, hit the calc button, then hit the apply button at the bottom , then save tun, then flash.

it doesnt work that way with the latest verion plus pcmforless alwasy ask for the orginal tires. u'll have to put the orginial tires with the new ones

orginial 245/65/17 gear 3.42 to new tires 265/35/22 3.42 gears

4279

[roy]

As long as the numbers in {H0101} and {H0104} hold the values from the calculator you should be good.
I just did a comparison of your posted file with one I ran the the speedo calculator on. The values did change in {H0101} and {H0104}
The values I got afterwards are 58504 and 1462.6 respectively.

Your correct on the numbers not staying in the calculator with what you typed in. But as far as I know that shouldn't matter.

[ScarabEpic22]

Hey man, Ive got an 02 TB I6 that Ive done a bunch of tuning on. To get the speedo correct, load up the speedo calculator and punch in your values for tire size, profile, rim size. The only other param you need to change is the gear ratio to 3.42. Dont worry about fine tuning or sprocket ratios (read the caption, just for FWD trans) and fine tuning is just used if your speedo is off by like 1 mph so you can adjust it. Also, once you have generated your new values make sure you change the shift points so everything matches up.

[goldbergv95]

Your correct on the numbers not staying in the calculator with what you typed in. But as far as I know that shouldn't matter.

but if the numbers dont say and cant not save why shouldnt it not matter? then that means the pcm tune wont work correctly.

[goldbergv95]

already did got the latest upgrade and provided both orginial and new tires but 1) it does not save do to some error 2) doesnt save to 3.42 on gear it just leaves it at 3.29.

here is what i did: speedo calculator typed in 265/35/22. clicked on two of the refresh buttons. change the gear ratio to 3.42.

on the next tab sprocket ratio: the last two options to fill were change to 3.42

on the next tab speed fine tuning : i dont know what to put on the speedometer or on the exact speedometeer

the last tap shift point correction: put in both the old and new tire calculations including the 3.42 gears on both.

I see the adjusted by -0.80%

I press apply

here is the result:
access violation of access ....efilive.exe
and some othere problem i dont even understand.

[joecar]

Which build of EFILive software...?

[Blacky]

Thanks for the detailed report, I am able to reproduce the error here at EFILive. Working on a solution...

Regards
Paul

[Blacky]

Until an update is released that fixes the problem, you can prevent the error by unchecking the checkbox next to the first item in the transmission tables list. That item should not be in the list as it is a read-only calibration. When EFILive (incorrectly) attempts to modify it, it fails.

See image which shows which checkbox to uncheck.

Regards
Paul

[goldbergv95]

alright i did that. the shift points and the trans changed to a lower number compare to the orginial number. is that normal?

[Blacky]

alright i did that. the shift points and the trans changed to a lower number compare to the orginial number. is that normal?

Well that depends on what you changed in the tire/gear settings.

Think of it this way:

If your 1st->2nd shift is at 20mph with 3.08 diff ratio, and assume the engine is spinning at 5500rpm at 20mph. If you change your diff gear ratio to 3.42, then at 5500rpm you will be traveling at a lower speed. So you want your shift points to be lower to maintain the 1st->2nd gear shift at 5500rpm (same goes for all other shift speed points).

It gets more complicated to calculate when you change both tire and diff at the same time. Depending on the values they may partially cancel each other out or both setting may add to the total adjustment necessary.

EFILive calculates the percentage change (positive or negative) for all the shift mph speeds. It then applies those changes when you press [Adjust].

Regards
Paul

[goldbergv95]

Well that depends on what you changed in the tire/gear settings.

Think of it this way:

If your 1st->2nd shift is at 20mph with 3.08 diff ratio, and assume the engine is spinning at 5500rpm at 20mph. If you change your diff gear ratio to 3.42, then at 5500rpm you will be traveling at a lower speed. So you want your shift points to be lower to maintain the 1st->2nd gear shift at 5500rpm (same goes for all other shift speed points).

It gets more complicated to calculate when you change both tire and diff at the same time. Depending on the values they may partially cancel each other out or both setting may add to the total adjustment necessary.

EFILive calculates the percentage change (positive or negative) for all the shift mph speeds. It then applies those changes when you press [Adjust].

Regards
Paul

Thanks Guys for all the help!:cucumber:

[goldbergv95]

Is this normal?

I had a tune up with pcmforless, the Vehicle Speed senor reads 65724 and the Trans Output Shaft Rev reads 2637.4.

But when I got another tune from them for an addition of changing gas to premium and I change the tire size and gear ratio to 3.42 which is what the truck gear ratio originial came from orgininal tires 245/65/17, I calculated my now tire size with my gear ratio 3.42 and tires aftermarket 265/35/22 the Vehicle Speed senor reads 58503 and the Trans Output Shaft Rev reads 1462.6.

But now for future purposes when I swap my gear ratios from 3.42 to 4.10 the Vehicle Speed senor reads 70138 and the Trans Output Shaft Rev reads 1753.4.

Is this normal? Because the Vehicle Speed sensor and the Trans Output Shaft Rev starts right between, then lower now its higher(4.10)

[Chuck CoW]

Is this normal?

I had a tune up with pcmforless, the Vehicle Speed senor reads 65724 and the Trans Output Shaft Rev reads 2637.4.

But when I got another tune from them for an addition of changing gas to premium and I change the tire size and gear ratio to 3.42 which is what the truck gear ratio originial came from orgininal tires 245/65/17, I calculated my now tire size with my gear ratio 3.42 and tires aftermarket 265/35/22 the Vehicle Speed senor reads 58503 and the Trans Output Shaft Rev reads 1462.6.

But now for future purposes when I swap my gear ratios from 3.42 to 4.10 the Vehicle Speed senor reads 70138 and the Trans Output Shaft Rev reads 1753.4.

Is this normal? Because the Vehicle Speed sensor and the Trans Output Shaft Rev starts right between, then lower now its higher(4.10)

Stay tuned! This is gonna be fun!

Brian uses LS1 Edit. Your EFI LIVE stuff will work differently.

I'm still suffering with it. The speedo stuff is complicated.

Chuck CoW

[ScarabEpic22]

Stay tuned! This is gonna be fun!

Brian uses LS1 Edit. Your EFI LIVE stuff will work differently.

I'm still suffering with it.

Chuck CoW

You probably know better than I do Chuck but Alvin tunes the P10 I6s using EFILive/HPTuners/whatever else he has up his sleeve.

[goldbergv95]

Is this normal?

I had a tune up with pcmforless, the Vehicle Speed senor reads 65724 and the Trans Output Shaft Rev reads 2637.4.

But when I got another tune from them for an addition of changing gas to premium and I change the tire size and gear ratio to 3.42 which is what the truck gear ratio originial came from orgininal tires 245/65/17, I calculated my now tire size with my gear ratio 3.42 and tires aftermarket 265/35/22 the Vehicle Speed senor reads 58503 and the Trans Output Shaft Rev reads 1462.6.

But now for future purposes when I swap my gear ratios from 3.42 to 4.10 the Vehicle Speed senor reads 70138 and the Trans Output Shaft Rev reads 1753.4.

Is this normal? Because the Vehicle Speed sensor and the Trans Output Shaft Rev starts right between, then lower now its higher(4.10)


anybody?