Hey guys... got my tuner a couple weeks ago.. and winter has set in (not a lot of snow yet)... May seem like a stupid question but.... I doubt there is... but is there any negatives to using a tuner (vmp Xcal 2.. 93perf) with 4-wheel high or low?

 

i dont think so but thats just a guess

 

I think your Xcal would be fine, I assume you mean in the snow/ice?

I had actually wanted to see how my towing tune worked out in 4x4.

 

I've certainly put my truck into 4wd (high) with the tune on it and have no problems whatsoever. Since 4wd simply engages the front axle, I don't see how the tune could damage anything.

- Jack

 

All a tuner does is reprogram the parameters of the engine and transmission functions, timing, fuel and air ratio, shift points, downshift points, valve pressure, etc. So, don't see how it could affect the four wheel drive as that is beyound the engine and tranny. Would be no different from and older vehicle where you might have put on a bigger carb, a cam and a tune up.

 

4HI uses the same shift strategy has 2HI. 4LO uses a different driver demand table and shift points.

 

That's why I was careful to say I'd used 4HI. Are you saying that the tune might cause the shift strategy to be something less than optimum in 4LO, or are you saying the tune could possibly cause damage in this range? Is it something we should be worried about? I often take our truck into back/high mountain roads and I need the 4wd capability, especially after heavy rains.

- Jack

 

Just from my personal experience. My truck with Troyer Tuning is stupid powerful in 4-Lo. VERY touchy throttle, instant torque. Be careful, it might surprise you at first.

If you are on icy roads just use 4hi. 4Lo has more of a tendency to spin the tires. The gearing in 4Lo if different, so the shift strategies are different.

 

I have had a tuner in my 4wd for two years on 93 performance and i have had it in 4 hi and 4 low and it hasnt hurt a thing

 

The factory driver demand tables are set up very conservative for 4LO.

Nope, you are fine. But the factory shift strategy for 4LO sucks IMO.

 

haven't had a problem with my tuner and 4wd

 

Thanks, i.ride - we don't encounter much snow and ice here in Tucson, but in our monsoon season on back country roads, things can be pretty slick, especially in the mountains. However, I've never been in a situation where I needed 4LO yet.

I also like to drop into 4HI anytime I'm on a narrow, dirt, steep dropoff mountain road for the improved traction. Seems to give me better control overall. (Not that I'm "racing" under those conditions).

- Jack

 

thanks guys... I didn't figure there would be a problem, but just didn't know if I should switch back to stock before messing with 4lo or 4hi... but seems like everything is well then...