Install was easy. HOWEVER

I chose the Tow setting #2

I have upgraded the rear tires only.
Rear P265 70R/17 Goodyear tires.

I left the front tires stock
Front P235 70R/17

So, when I set the tire size to 2521 mm on the EVO I had terrible performance.

Terrible shudder in the trans and the wrench light came on the dash.

Horrified, I set the system back to the stock tune.

What do you think? Is it my tire size differences?

Gears Stock 3.73

Everything else on the truck is stock.

 

This is puzzling to me too. I don't think your truck is 4WD, correct?

One thing I know is that Bill Cohron at PHP has advised not making any changes to Tire Size (TS) or Gear Ratio (GR) or any of the other "custom options" the FIRST time you load a tune into the PCM. This is so the Edge can build its files properly.

So, with the truck back to stock, I'm assuming the problems go away?

If that is the case, try loading the Level 2 tune without changing anything else. See how it behaves. Then, if things are all right, reload the Level 2 tune and try changing the TS to 2440mm (your 2521mm did not account for "squish"), and verify that the GR is 3.73.

If you get the wrench light again in any of this, try to find the codes that are being thrown. The Edge gives you this capability. You MAY need to clean the throttle body and/or the MAF, looking at the age of your truck.

- Jack

 

Hey.

Remember my previous post concerning CS/CTS?

IRC, This is a known issue; at least, I seem to remember seeing this type of issue reported in the past (no garn'tees, though ... I be a fossil and fergit my Depends half the time, so don't quote me, lol). There may be updates available to cure this. Contact Edge and report.

Worst-case, get in touch with PHP and convert the unit. Instructions on their website and in their forums. You need to download some software.

Additionally, good ol' DewserB can step ya through it - I'm an SCT guy (now ya know why )

BUT - before ya do any of that, did you confirm the initial settings? Is the r
rev limit at least 400 rpm above any shift points? Look thru that linky way back fer details on this.

It ain't the tire mismatch - VSS speed data does not come from the front wheels. Although, that may pekker yer ABS functions and TC if ya have it.

MGD

 

Good things to think about.

Thanks :-)

 

^ This is everything I could think of too. I'm pretty sure the default gear setting is 3:73, but double check that to make sure.

 

I did. Thanks.

I'm going to take MGDfan's advice.

I actually had programed the Edge to level 2 and forgot the tire change. then when I got on the road I noticed that the GPS and the spedo was still off. So I turned around back to home and reprogrammed using the new tire size. It was horrible and scary.

 

You may have an underlying mechanical, electrical, sensor, etc issue that has been exacerbated by the Edge. That happens too.

I'd call Bill at PHP and see what he says about it. Did you run diagnostics when the CEL came on?

 

Didn't run diagnostics. I was too nervous and just wanted to get it back to stock.

I'm going to try again.

 

Not 4x4

I still have to do a second run yet.

I've got a camper top (weight on the bed). I'm just trying to think of anything now.

Thanks :-)

All good advice.

 

I set the EVO to level 2 but did not change the tire settings.

No problems at all. Only the Speedo is still off with the larger tires.

More work to do later.

 

Great news!

Unfortunately, this is NOT in the Edge User Manual

MGD

 

I know. *shrug*

I'm not personally convinced this is a big deal, but since Bill has talked about it, I pass it on.

Since the truck seems to be running well with the Level 2 tune and NO customizations, it almost sounds to me like there might be a slight corruption in the tune that was loaded WITH them. The TS change doesn't really alter anything except the information that is sent to the speedo and when the transmission shifts under part throttle, so I'd try reloading with the TS that I suggested. Again though, if you get a CEL, find out what codes are being thrown - it may help to figure out what's going on.

- Jack

 

Actually I had programed to level two at first without customizations (kind of by mistake). When I got on the road I noticed that the speedo was way off as usual. So I thought... maybe my tire size did not stick. I got back home and sure enough I realized that I had pressed menu instead of enter after I set the tire size and it did not stick.

Then I reprogrammed and added the customization.

So in reality I did it correctly the first time. Going to try different tire size and try to grab any codes later.

Thanks fellas.

 

Keep us posted! Glad it's acting better now.

FWIW, I'd run it without any custom settings for at least 200-300 miles.

 

It took me a while to get up the nerve to try this again. It was worse than before. I did not get past the fist stop sign before I felt a shudder and the wrench light came on.

Then I thought about your advice and tried it. I chose level two then verified my trans at 3.73. Then I set the tire size to 2440 mm taking into account the squish. IT WORKED!

Speedo is accurate and I am happy.

Thank to everyone here and especially JackandJanet