Competition 1st time at strip any advise?

[diesel4power]

I'm going to the drag strip next week for test and tune night. I have never been to a drag strip but you gota start somewhere. Some things I wonder about are:



Tire pressure, does this make any difference?

Launch in 2X4 or 4X4?

Should I shut out overdrive till a certain speed?



Any advise appreciated



Paul

 

[RCone]

Tire pressure, does this make any difference?

Launch in 2X4 or 4X4?

Should I shut out overdrive till a certain speed?



Any advise appreciated



Paul

I run/ran my tires at 40psi cold.

Launch in 4x4 with absolutely no more than 10lbs boost unless you have billet input and output.

Just leave OD activated, you will be busy enough as it is

If launching in 4x4 shift to 2hi as soon as you hit 2nd gear.

Trip first staging lite, then power brake to build boost and creep into 2nd staging lite.

Depending on the tree, leave on the last yellow. If you wait for the green you will be late.



Be safe, have fun. Sounds as you should be able to run in the really low 14's or high 13's. Let us know.



PS. If you really want to baby your truck, don't build any boost at all, just stage and go. Actually, if you intend to dial in and bracket race, personally that is what I would recommend. Not quite as fast, but way more consistent that way, IMHO.

 

[diesel4power]

Well I went to the track last night and had a great time. Made four runs down the track the last two being the best. 14. 7 @91mph Bit dissapointed, thought I would be closer to 14 even. There was a Powerstroke there and he ran a 14. 07 He ran with his tailgate down, does that make any difference?



So what's next? can't let those Fords beat a real truck right!



I have that defueling problem with my truck, can only build about 9lbs boost. I got the BD-RAD in the mail today which should take care of that.

Although I break the tires loose in 2X2, those were the best times. 4X4 seems to really bog down the truck and spool up is much slower.

Also today I sent back my Powermax3 to be reflashed to Competition version.

So when I head back to the track (this could be addictive) in two weeks how much do you think I will shave off the 14. 7



Come on guys, how do I get those 13's?

 

[RCone]

Your tire size is hurting you a little. Upgrading your TST might help some. I don't know why you would have the defueling problem at the line. I don't and launch in 4x4 at bout 10psi however my drag comp doesn't defuel at 2700 on 5x5 either. Don't know if TST comp works same was but spect it does. You are shifting out of 4x4 right after you hit 2nd gear are you not? What do you estimate your GVW to be? Some say that for every 100 lb reduction, you shave a tenth. How much max boost did you see or did you have time to look. You should be around 40psi.



They say tailgate down actually is determental. There have been wind tunnel studies on this, but still that shouldn't make that much difference at this stage of the game.



I will still think you should be in the very low 14's with your setup unless you are running out of fuel or boost (leak etc. ). Don't rive thru the VHT burnout box if you launch in 4x4. Feel free to PM me or if you want to invest in a fone call, PM and let me know.

 

[diesel4power]

RCone Thanks for the reply's



Yes I shifted back out of 4X4 when it changed to 2nd but I did notice the 4WD light on the cluster did not go out for a long time. The run I did with 4X4 launch was 14. 99

I understand that most if not all 2001 and 2002 auto's defuel in 1st and 2nd gear. Its nothing to do with the fueling box, its the ECM torque managment system. I see you have the Mad catcher and I have followed that thread from day one. Someone asked Marco if it would take care of this defueling problem and his answer was "sometimes" you can tell the problem, when you power brake the boost builds up to about 9lbs and the engine just won't rev anymore.

I am getting good boost when running of about 46lbs

And yes I remember now the TST box does defuel at 2700 rpm. The comp version does not and it goes from a 120hp box to 160hp

I also read that tailgate down does not help fuel economy but what I may do is take it off for weight savings.

 

[mattymac]

I would think that your rig would be faster than 14. 99? I would say you should be in the 13's at least. A 2000 in town here has the same set up as you except for DTT and edge drag comp with a small shot of NOS and on 35's with huge bumpers front and rear he manages a 13. 5.

 

[BigDan]

Yeah something's wrong im a 1999 stock w/ a comp box and I can run a 14. 9 with your same size tires.

 

[paulb]

The defueling doesn't hit all 01. 5 and 02's. Mine doesn't have the defuel problem at launch. I launch with between 15 and 20psi (depending on conditions), without a problem. I know someone with a 01. 5 and it does defuel. My truck does defuel at 2700, but I still ran a 14. 07 at Boise ID, last weekend. My truck weight with driver is ~7000. Hope this info helps...



Paul

 

[diesel4power]

Well after being dissapointed with 14. 7 in the 1/4 I invested in a BDRad and sent my PowerMax3 to be reflashed as a Comp version. Went back to the track last night and ran a 13. 6 @ 98mph. I am pretty happy now since the Comp box was set on 8 and not 9, means I could probably run about 13. 4 Oh and btw I ran against a new 1/2 ton 2X2 regular cab short bed Hemi and I half tracked him, beat him by 3. 27 secs. Next stop 12's???

 

[DavidTD]

Well after being dissapointed with 14. 7 in the 1/4 I invested in a BDRad and sent my PowerMax3 to be reflashed as a Comp version. Went back to the track last night and ran a 13. 6 @ 98mph. I am pretty happy now since the Comp box was set on 8 and not 9, means I could probably run about 13. 4 Oh and btw I ran against a new 1/2 ton 2X2 regular cab short bed Hemi and I half tracked him, beat him by 3. 27 secs. Next stop 12's???

Good job on the track. 1. 1 second improvement must have felt like a shot a nitrous. Oo.



I read this month in one of the car magazines a test conducted on trucks on the a wind tunnel. I don't remember the actual numbers, but remember best aerodynamics was tail gate up. Worst off. Down was in- between. It was noted that a cover made a big improvement.



So - that makes me think - does the weight advantage of taking it off out-weigh the worse aerodynamics? For my truck it stays on so the cooler doesn't fall out. :-laf