What Do I Need To Tell Wait4me?

DustySLT · May 19, 2007

I had a wait 4 me tune installed on my sierra and asked for the removal of tourqe management, but isn't there something else limiting the engine when I mash the throttle off the line?? I mean I kick it down and it just like hesitates.....I know this engine should have much more "umph" than that off the line!!

ridnlow · May 19, 2007

what gears??

diehrd · May 19, 2007

I bet he has 3.73 and with them I would not expect ground burning take offs with a 35" tire

DustySLT · May 19, 2007

I bet he has 3.73 and with them I would not expect ground burning take offs with a 35" tire

I think I do have 3.73's but the thing of it is, it's like the computer is limiting the throttle or timing or something to open it up all the way when I mash the throttle, and I know it takes more for it to get those 35" tires going but it's not really that, it feels like the engine is being limited, like it's that "abuse" mode or something.......

diehrd · May 19, 2007

I bet he has 3.73 and with them I would not expect ground burning take offs with a 35" tire

I think I do have 3.73's but the thing of it is, it's like the computer is limiting the throttle or timing or something to open it up all the way when I mash the throttle, and I know it takes more for it to get those 35" tires going but it's not really that, it feels like the engine is being limited, like it's that "abuse" mode or something.......

Abuse mode would actually place you in 2nd gear at start out you would notice that for sure.

Did you send one in to him or but a tune with a pcm >? I always get a PCM so I have the stock for back up if you do toss it in see how it drives with that 1 ..

Schmids5.3l · May 19, 2007

Send it back and tell him its screwed up, and describe the problem.

Billdog350 · August 2, 2007

Torque management is one item, the factory spark advance is the other. My factory timing tables on my 6.0 were in the single digits. I cranked it up to over 20 deg (with no knock detected) and the truck really takes off now. There are lots of places that tuners have to tweak your tune, its possible he missed one, or didn't want to disable the "tranny protection" that GM built in from the factory.

omegafiler · August 6, 2007

TM actually has nothing to do with that lag off the line. TM applies to the way it shifts. But I would give him a call first and explain the issue. However he does normally makes many changes to the PCM such as timing/spark advance/etc to improve performance off the line (aka, GM abuse management). Perhaps he can go even more aggressive in this area.

Otherwise, there could be other causes. For example, physical limitations of the power you have in relation to vehicle weight, big tires, trans, and gearing.

MikeRS1981 · August 6, 2007

TM actually has nothing to do with that lag off the line. TM applies to the way it shifts. But I would give him a call first and explain the issue. However he does normally makes many changes to the PCM such as timing/spark advance/etc to improve performance off the line (aka, GM abuse management). Perhaps he can go even more aggressive in this area.

Otherwise, there could be other causes. For example, physical limitations of the power you have in relation to vehicle weight, big tires, trans, and gearing.

I was told by Wait4me that it was TM holding the truck back at launch. Its an abuse mode of some sort, so you can't sit there and bake the tires at a launch. You can feel the truck holding back till 2500 rpm or so, or about 4-5 seconds of WOT.

omegafiler · August 6, 2007

TM actually has nothing to do with that lag off the line. TM applies to the way it shifts. But I would give him a call first and explain the issue. However he does normally makes many changes to the PCM such as timing/spark advance/etc to improve performance off the line (aka, GM abuse management). Perhaps he can go even more aggressive in this area.

Otherwise, there could be other causes. For example, physical limitations of the power you have in relation to vehicle weight, big tires, trans, and gearing.

I was told by Wait4me that it was TM holding the truck back at launch. Its an abuse mode of some sort, so you can't sit there and bake the tires at a launch. You can feel the truck holding back till 2500 rpm or so, or about 4-5 seconds of WOT.

Interesting... he told me the exact opposite. And that it wasn't actually TM, but other spark/timing tables GM put in place that was causing the lag on launch.

But I'm sure it's all relative when it comes to programming these rather complicated PCM's. And since I'm not about to try and figure it out myself, I'll just be happy that it all works the way it should!

diehrd · August 6, 2007

Just to add .. My truck with 3.73 is a dog at a full power take off from a stop..In turns I can just break a tire free lmao.

However at 35Mph when I punch it the truck snaps to attention and pounds out the power in an impressive way that is surprising... SO I know the tune is fine and I am building power well but the fact is a 35" tire with 3.73 is a crappy combo for take off performance ......

MikeRS1981 · August 6, 2007

I'm almost positive though that its Torque Mgmt, because even though its timing/spark like you say, the computer is doing that so your not getting full power to the wheels. I dont care what gears you have, the trucks back end is light, and tires should break lose with full power, but timing is retarded to an extent it wont do that. When they pull the TM, the shifts are harder because timing isnt being pulled, and you are seeing what the motor really is supposed to be doing.

diehrd · August 6, 2007

I'm almost positive though that its Torque Mgmt, because even though its timing/spark like you say, the computer is doing that so your not getting full power to the wheels. I dont care what gears you have, the trucks back end is light, and tires should break lose with full power, but timing is retarded to an extent it wont do that. When they pull the TM, the shifts are harder because timing isnt being pulled, and you are seeing what the motor really is supposed to be doing.

Your reasoning sounds good, BUT you have never tossed heavier tires and rims , which are a lot taller on a stock axle ration and punched it have ya ? ? ?

T/M is not his issue , and if he came stock with 245 series tires he is likely to have a 3.42 axle which is common on a 4x4 and if that is the case forget spinning tires until it is wet out or snow covered

I know he said 3.73 may be in there , but he needs to check RPO code in glove box to know for sure.. And even with 3.73 , the heavier, taller , bigger foot print of the new tires will sap his take off speed immensely and make the truck feel like it is being held back , bogging down and generally have no balls at all...

Take truck to 35 punch it see if it winds to 5600 or 5800 before it shifts .. I bet it does and I bet he is at about 50mph when he shifts 1 to 2 .. And I bet like me at about 65mph he is only at 1500 on tach where stock trucks are at 2k plus at 65.. Gears make a huge difference and tossing real big tall tires on a stock set of gears will show the layman just how much difference a gear ratio makes in power available at the rear wheels...

VMax2007 · August 6, 2007

I'm almost positive though that its Torque Mgmt, because even though its timing/spark like you say, the computer is doing that so your not getting full power to the wheels. I dont care what gears you have, the trucks back end is light, and tires should break lose with full power, but timing is retarded to an extent it wont do that. When they pull the TM, the shifts are harder because timing isnt being pulled, and you are seeing what the motor really is supposed to be doing.

Your reasoning sounds good, BUT you have never tossed heavier tires and rims , which are a lot taller on a stock axle ration and punched it have ya ? ? ?

T/M is not his issue , and if he came stock with 245 series tires he is likely to have a 3.42 axle which is common on a 4x4 and if that is the case forget spinning tires until it is wet out or snow covered

I know he said 3.73 may be in there , but he needs to check RPO code in glove box to know for sure.. And even with 3.73 , the heavier, taller , bigger foot print of the new tires will sap his take off speed immensely and make the truck feel like it is being held back , bogging down and generally have no balls at all...

Take truck to 35 punch it see if it winds to 5600 or 5800 before it shifts .. I bet it does and I bet he is at about 50mph when he shifts 1 to 2 .. And I bet like me at about 65mph he is only at 1500 on tach where stock trucks are at 2k plus at 65.. Gears make a huge difference and tossing real big tall tires on a stock set of gears will show the layman just how much difference a gear ratio makes in power available at the rear wheels...

Then explain this...

My "drive by cable" 2000 GMC Sierra Z71 with the 5.3 liter and 3.73's with 285/70/16's (stock tires were 265s) was bone stock with the G80 locker and it would roast both tires from a dead stop, even on hot, dry pavement.

TM definitely affects take-off power, no question about it.

diehrd · August 6, 2007

Ok well the obvious has eluded ya ,, LOL...

265/70/16 is 30.6 inches tall

285/70/16 is 31.7 inches tall...

Why did you roast tires before and after ??? ya had almost the same tire size swapped out

In his case he jumped over 4 inches in tire diameter .. , a lot heavier , and a lot more contact patch on the pavement .... If any one has never gone from 256 to a 35" tire it is hard to explain in words the dramatic loss of power at a standing stop full throttle take off... And if T/M is playing a part i can assure ya it would be even worse with that tire and gear combo he and I have ...