Fine Tuneing Issues

[john griffin]

We got in from Our 2 .5 week road trip this afternoon.The truck pulls good but does have a worrysome glitch. I usually run 65 on the interstates and on the level I'm getting 6 - 8# boost and 600 - 850 * egt's, 175* trans.This OK (I think),remember I'm towing a 14k, 37' toyhauler.The hills are what I do not like.If I "drive" it (no cruise) and lift the throttle as it lugs down to 1600 rpm or so,the egt's will start to clime and hold at around 1150,boost will be around 12 to 15.If it downshifts,rpm will go to2400,boost and egt will come up rapidly.I can control the egt rise with the throttle and keep it at 1190 and 18 to 20 boost,but I dont think I should have to.If I am running on cruise,it will lug down to 1600 but then downshift and go to full fuel and 2600 or so rpm.The egt's and boost skyrocket and I have about 5 seconds to cancel the cruise before the egt goes past 1250,and is climbing like an f 16 in afterburner.When I cancel and let it drop back to 50% fuel (still 2600rpm) the egt drops back and holds at 1170 and 20 to 25 boost.I am literally driveing it by the egt gage.I am going to ditch the K&N for a NAPA gold 6637 tomorrow because I think its starved for air.Any suggestions or inputs on this???

edit) It pulls hard from a stop,full fuel gives me 2600 to 2800 rpm shifts and 28# boost at a steady 1140.It also has a very satisfying woosh when it shifts and the turbo unloads.My wife makes fun of this and tells everyone I spent all these $$ and 3/4 of the summer just to make it "woosh".

 

[john griffin]

I got a 6637,but not from napa.They wanted $70 for it,I bought it thru amazon for $31. Now I am all for keeping my $ local,but that was rediculous. I told the owner of the napa store too.I do know the guy and do spend more than a few $ there,but not that time.

Anyway,rant over! the connecting sleve at the trbo is 4",the k&n is 3".Thats a whopping 44% difference!I started out fitting some 4" od ss pipe bends together to connect the 6637,but decided it was easier to use the stock rubber boot because I have better things to do this time of year.I had to trim almost all of the batt box off, but everything fits nicely now with the filter missing all around by 1/8".I heated up a large drift pin and burned a 5/16" hole in the boot,then champhered it with a stanly knife so that the stock restriction indicater would snap in.I really dont know why.I just did it.I have not driven it yet, but at idle the noise from the turbo is more pronounced,so my wife will like it.In order to see if it reduces egt on my "test" hill,I will need to simulate the 14k # of the TH.Monday I will be hauling hay,but thats onl 7k at a load.I will run it down to the test hill on m-72 and try it.End of next week I have a back hoe job down that way so I will test it with the equipment trailer which coincidentally is 14k loaded.Then I need to find someone who wants a k&n setup!

 

[BIG JOE]

NICE work John !

 

[WD40]

Yes, that's nice work and I have never been impressed with K&N. That thing may sound like a small jet taking off.
Doug

 

[john griffin]

I ran the test hill 2 times with the 7200# hay load,then one more time with a 7600# load.Same senario but this time the downshift brought the boost to 28# instantly,the egts shot to 1240 and just as I was about to cancel the cruise stopped climbing!1240 is still too high and did trigger a "service engine soon" light,but,at least its not a bomb with a short fuse!The fiver and bh trailer will probably have a different effect,but I think this is progress.I did get some coal with this setup,but not a cloud,just a faint trail,and the noise from spool down after upshifting is much louder.Now I feel like I'm at a dead end,but we will have to see what the extra wieght does to it.

 

[f100cleveland]

About twice a year NAPA has a filter sale. Thats the only time I buy from them.

 

[john griffin]

I have the old tilt deck eq trailer hooked up to get a load of steel roofing in Manton,and lumber in Cadilacc tomorrow.This will only gross about7k,but input is input!