They are considered User-Adjusted settings. Which I'm glad for, it would suck having to buy a new tune everytime you got a different tire size.

My speed showed 3-7mph SLOWER then what I was really going until I adjusted the Revs Per Mile on the Xcal3 to 600 for my 315/70/17's

BTW tirerack.com shows Revs Per Mile for tires under their specs.

 

ahh... Thanks guys, alot of helpful info here! I wish I could get a 93 perf. tune but all the fuel stations around here only go up to 91, and only one of them has the 91 octane.. ( I'm not sure the difference in tunes from a 93-91 octane fuel..)

I'm thinking about just going with justin's 399 Xcal3 w/ custom tunes. I'm not sure I even need to call him really.. I do want to make sure I get all my information relaid correctly so my tunes are as accurate as possible..

It does just about suck that I'll need new tires by the end of this year probably and will have to mess with adjusting for them. After I used edge's adjustments in the manual for 34's, now 37's the speedo was always off for about 3 years.. I just got it 1mph off (over) by adjusting for the squish a few months ago, I take it that is similar to what you guys are talking about in previous posts? I'm definately a tuner so you guys know a hell of alot more than I do and I sure appreciate the help!

 

If your speedo is 1 mph fast at around 70, you're almost dead on. It should actually be about 2 mph fast there, because there's about a 3% error that's kind of "built in" to the speedometer mechanism. This is not a difference I'd worry about.

And, just to be clear on this, even if a tune HAS input different values for TS or GR, the good programmers allow you to override those values for what you have installed.

- Jack

 

Jack,

You are probably more than right about my speedo, When it comes to tuning/ adjusting these things I'm constantly learing as I go, and still feel like a complete nooby! I'm just glad its closer than it was. With Edge's settings for my 37's at 70mph the speedo showed 74-75 I need to get the guages/speedo working on the Avic D3 so the mph can be judged from the navigation system/satellite deal instead of my calculations and the edge readout

 

They program identically.

 

I have both VMP and Troyer tunes. I had a no start with my first couple of tunes from Justin, and he was very good about getting me set up properly. Truck threw a code after a while, and called Justin about it. He had a new tune to me the next day that took care of it. He has spent a lot of time and effort on one tune for me, all for fifty bucks. I would recommend VMP to anyone on the board.

 

I FINALLY understand! :duh: :o

The Edge manual DOES NOT factor in "squish" at all. The circumference values it gives are for an unloaded tire. You CAN use those numbers though, if you multiply them buy 0.97, which would subtract 3% for the "squish" effect. That should give you a pretty good starting point.

Depending on your tire construction and pressure, you may need to apply more or less of a correction. More, if you still indicate too fast, but less if you are now reading slow on the speedo.

Sorry I confused you!

- Jack

 

I have a completly stock truck mod wise. I have noticed the the truck is far more reponsive and the trany seems to be much smoother, and shift a bit firmer. I am very happy with it. I have had can tunes before and hands down the VMP tunes are the way to go. The tunes really woke the truck up.

 

Ouch.. lol.. maybe there is something wrong with my tunes.. but my truck likes the idle at 750.. Either way, the truck drives awesome.

I didn't realize FX4 was asking which tuner was the best? I was just sharing with him my experience.. lol

Long story short, when I bought my tunes it was pretty much between Troyer or Justin, and Justin had a much quicker turnaround. I had my tuner and custom tunes within the week. In hindsight, I might have considered PHP, but the Gryphon wasn't around yet. I dunno if I would have cared for the extra gauges, but it certainly wouldn't have hurt.

 

Zeruin - I'm going to suggest this again: the problem MAY be carbon buildup in the throttle body. Here's a link that explains it - it's the next to last FAQ: http://dygytalworld.ehost-services139.com/php/FAQs.html

You should at least have a look.

- Jack

 

I appreciate all the help guys! It sounds like it is now just making the decision between PHP and VMP tunes.. Its too bad someone has not gone from PHP to VMP and vice versa

 

I'm thinking about ordering an extra tune just for the heck of it.. I think I'm gonna hit up PHP this next week and see if they can send me a custom X3 file.

I dunno if the throttle body was an issue, the truck had <500 miles when I hooked up the tuner, it has less than 10k on it now, but I guess it wouldn't hurt to take a look. Personally, I like the sound of my truck idling at 750.. has a nice rumble to it.. dunno if that's really an issue.. lol

 

just givin an update since iv had time to try out my new 87 perf. tune from vmp on my x3. muuuuch better than my old hypertech. faster firmer shifts, doesnt feel liek you hit a dead spot when you shift gears anymore. just more overall smoother power that you can feel. also if you hate your top speed limiter like i did, get an x3 i love pissin off those other trucks that get stuck between 95-105 hahahah while im doin 120+!

 

Trust me there is. I've been running VMP's custom dyno tune 93 perf for the last 30k miles and I just switched to his 87 perf and I noticed a definite power loss in passing power, gear switches, mid-range, etc. Basically it just makes less power. lol I'm switching back to 93 as soon as I run the tank out.

As for the speedo reading. I used to have an Edge and I kept it as guages so it's still plugged in. The Edge readout is dead-on with my GPS readout but my speedometer is 3mph fast at 80mph.

Hope this helps.