Engine/Transmission (1994 - 1998) Slow early response in my '98 12 v..

[JHenry]

I have an AFE Stage II filter, #5 TST plate, straight pipe back from turbo, automatic with BD valve body and T/C,and 35 inch tires. I bought the truck stock3 months ago and did the modifications since I have owned it. There is a brief hesitation if I accelerate hard from a complete stop. Once it gets out of the hole, it accelerates very quickly. My '06 is a 6 speed, and there is no hesitation. Is it normal for the automatic? Would I need timing change? Or would a GSK help? The #5 plate was recommended by TST without the GSK because I was looking for lower end power for plowing snow, which I have plenty of. But I don't like the hesitation when I want to get underway. Any suggestions would be appreciated.



<a href=http://photos. imageevent.com/jerryinw500/jerryinw500firstalbum/websize/IMG_0905. JPG>Click for My '98</a>

 

[MAllen]

I would turn the afc screw towards the front of the engine. By moving the afc starwheel it will give a little more fuel at low rpm and when you have little boost. It is located under the hex head screw on the rear of the pump. I would start by moving it forward 12 clicks and drive it to see if that helped and if need be move it some more. It seems that normally advancing timing would not give more low end power, but can make the truck run worse if your timing is retarded too far. Hope this helps

 

[JHenry]

Does the afc screw have a hex head? Will I feel a positive click when I turn it?

Thanks.

 

[MAllen]

You will see a hex head plug, I forget what size it is, but it is a larger size allen wrench key to remove the plug and you will see the star wheel inside of it. You use a screwdriver to click it towards the front of the engine to move the wheel closer to the front of the engine. I'll post a pic of the screw.

 

[MAllen]

open this pic and you'll see the head at the top of the pump. this will give you a better idea of what your messing with

 

[JHenry]

Nice. Thanks. I'll give it a try. I also read about a replacement spring kit that TST sells. But maybe this will help. Thanks again.

 

[MAllen]

THe governor spring kit abbreviated GSK can greatly improve fueling up to 3000 rpm and above depending on what kit you buy. That is my next upgrade on my truck. Most guys on here say that is the number 1 upgrade to make on your truck for the money. Your choices there will be a 3K GSK, 4K GSK, or a 5K GSK. 3 or a 4 would do a lot for top end fueling.

 

[JHenry]

My main use for the truck is plowing snow in the winter, and pulling a dump trailer or lumber trailer with around 10-12000 to my construction site. I hesitated on the gsk kit when I bought the #5 plate from TST because the tech. rep. said this plate didn't need the new governor springs for the type of use I described. What do you think? Thanks again for your input. I love this 12 valve engine for all the seemingly endless things you can do.

 

[MAllen]

I'm the same way with being able to tinker with the p pump as much as you want to. As far as the gsk goes, if you have a manual like mine, I know it can make a tremendous benefit especially between 3rd and 4th gears pulling a load. Hopefully someone else chimes in and lets us know how it would operate with a auto transmission. For just pushin snow, I think you have plenty of power but for pulling, I think you can never have enough.

 

[GOlsen]

Are the replacement springs you are referring to the AFC spring kit? It includes a heavier and a lighter spring. Putting the lighter spring in reduces the preload on the AFC, and gets it started moving under lower boost. As far as the GSK goes, unless you do some transmission mods, you won't take full advantage of the kit. The transmission in it's stock form is designed to shift before your truck starts to defuel. When I had my transmission built, my builder asked me what GSK I was running, that way the valve body is built up to take advantage of the extra fueling. Hope this helps a little.

 

[JHenry]

I moved the star wheel 10 clicks forward and noticed no change. Then 10 more clicks forward and still no change. Any comments? Thanks

 

[GrantP]

Mine is a little sluggish "out of the hole" too, star wheel adjustments don't seem to affect much more than how much smoke comes out of the tailpipe when leaving the stoplight. Once boost comes up it'll move. In my case, a fairly tight DTT torque converter, 3. 55 gears, and 35" tires all contribute to this. Not sure what ratio you are running or when you noticed the lag, but I'll be doing a 4. 10 gear swap soon.

 

[JHenry]

I have BD valve body and a triple disc T/C, for sure. Not sure about the final ratio, but probably 3:55. The lag is at a dead stop if I put the pedal to the floor. It just takes a little longer than I'm used to to get moving, then it's fast. Maybe it's the nature of the beast, given the combination.

 

[TurboFan]

That is a great cut away picture, thanks.