Data Log 6L Procharger 2500HD

[wentbig]

I just paid to data log with a wide band and EFI Live.
I found out I was going into PE at 60 mph on flat ground pulling my trailer. We change to 38% peddle befor inrichment.
Raised top speed to 140 mph, pulled out all abuse and TM.
What I don't get is I feel no change at all empty or loaded.
I thought it would shift hard or at least burn-out.
I am making 8 psi and have dual magnaflows, it is quick but I want smoke at the tires when I stab it.

[Pauly]

The problem is that you are using a centrifugal supercharger. These need engine rpm in order to make boost. A perfromance torque converter would help somewhat, but you dont want to go too high in stall speed because of your towing.
Another issue is the GEN 3 engine itself, it simply doesnt make the off idle torque that a 350 does, but once revs get over 3500rpm, they do make good power.

A Magnacharger or Whipple or Kennebell positive displacement supercharger will give you boost off idle, while a centrifugal wont.

You are going to want PE whenever you are into the boost. If you are in boost on flat ground while towing, you will want some extra fueling. A Whippled engine will want PE fueling at very low rpms/throttles as they make so much off idle boost/torque.

Centrifugals are great fro racing and wideopen throttle towing, but for lower rpm, lower TPS towing, the positive displacement blowers are king.

peace
PAuly

[wentbig]

All superchargers take rpm to make boost, that is what turns them.
PD blowers don't make boost till the motors vac. drops to zero.
Vacuum will drop if you floor it from a stop. In this case the PD depending on displacement will move more air for a second.
In my case I can't get into boost at less then 35% pedal, so I don't want PE I want to save the gas.
I am going down another pulley size again. I am thinking if I am making 12# at 5500 rpm it will be just right at 3000 rpm.

[wentbig]

I just found out they did'nt pull the traction control. The 02 2500HD did not come with the button. I will reflash and try to boil the tires.

[95tahoe95]

I just found out they did'nt pull the traction control. The 02 2500HD did not come with the button. I will reflash and try to boil the tires.

You might want to "boil the tires" but buying tires every 6-8 months gets old quick, besides having power and being able to hook up is faster than power and not hookig up...:whacko:

[wentbig]

LOL I am 51 years old and a 20 year old is telling me about not boilin tires.
You are right. At the track it is all about traction control. I run a 388 lb. 140 HP Harley 1200cc with a 5" slick and a wheely bar.
When I can hang on I run 11.49 at 120 mph.
All I want to do with my truck is flatin the hills in NorCal and show off around town. Showing off is very important to me.

[95tahoe95]

LOL I am 51 years old and a 20 year old is telling me about not boilin tires.
You are right. At the track it is all about traction control. I run a 388 lb. 140 HP Harley 1200cc with a 5" slick and a wheely bar.
When I can hang on I run 11.65 at 120 mph.
All I want to do with my truck is flatin the hills in NorCal and show off around town. Showing off is very important to me.

no disrespect intened, didnt look at your age, and I get the showing off part...goodluck!

[Pauly]

All superchargers take rpm to make boost, that is what turns them.
PD blowers don't make boost till the motors vac. drops to zero.
Vacuum will drop if you floor it from a stop. In this case the PD depending on displacement will move more air for a second.
In my case I can't get into boost at less then 35% pedal, so I don't want PE I want to save the gas.
I am going down another pulley size again. I am thinking if I am making 12# at 5500 rpm it will be just right at 3000 rpm.

The PD blower will make much more boosts at lower rpm than a centrifugal.

If you arent seeing boost, then yes you dont need PE fueling.

ALL superchargers dont make boost until vacuum drops to zero, not just PD SC's.

Bottom line, if you wanted to have a good towing rig that can roast the tires at will, you should have gotten a PD blower. Changing pulleys is just band-aiding for incorrect supercharger selection for your application.

peace
PAuly

[the_target]

Pauly... not trying to start a war with you :twak:... but I have both types a twinscrew on my jeep and HAD a whipple on my truck..you are correct in saying that a and "Roots" type has more low end grunt. BUT I will have to say that a properly sized centri can make boost down low and provide good results :burn:

[para driver]

would a little NITROS give you more instant gratification, until the blower spools up?

[kkustomz]

I imagine its something in ur tune!

[wentbig]

Yes it was the tune you where all right, thanks for the input.
We pulled out traction control, all the torque management trans and engine, abuse mode gone. Now in tow haul from and standing start I can nail it and the torque let's the rpm come up to 2200 that is 5# boost, then the tires break loose and the rpm jumps to 4000 and the boost climbs to 8#.
Then it up shifts to 2nd. and it starts all over again.
I have a 3.50 pulley on now next I will try a 3.20. I going for around 10 or 11#. Whats up now?

[Vaquero]

that's awesome!!!!!!!!!!!!!!!

[moregrip]

excellent. Do you have any pics of your setup?

[wentbig]

I don't know how to post pics. The truck looks stock 2500HD 4X4
I just did a 3000 rpm stall converter and Meth injection.
I can launch at 8# boost and hit 11# right away. With that converter I can't feel the 1-2 shift 3rd is where the tires hook-up.

[moregrip]

I don't know how to post pics. The truck looks stock 2500HD 4X4
I just did a 3000 rpm stall converter and Meth injection.
I can launch at 8# boost and hit 11# right away. With that converter I can't feel the 1-2 shift 3rd is where the tires hook-up.

righteous, sounds like a beast

[wentbig]

Moregrip, have you got a 1/4 time on your truck. Not many guys build a 2500HD like yours. We have an extra 1000-lbs. of steel over the little 1500 1/2 ton guys. I think on my 4X4 2500HD I lost 70 HP from the crank to the wheels.

[moregrip]

Moregrip, have you got a 1/4 time on your truck. Not many guys build a 2500HD like yours. We have an extra 1000-lbs. of steel over the little 1500 1/2 ton guys. I think on my 4X4 2500HD I lost 70 HP from the crank to the wheels.

ran a 13.8 a few blowers ago when it was putting down 430rwhp; that was with the MP112 @ 7lbs of boost, I have since upgraded to the MP122 @ 10lbs of boost, and my current setup is a TVS2300 @ 11lbs of boost. No current 1/4 mile times though.

[wentbig]

Sub 14 sec. that's sweet. Sac Raceway starts Wed. night drags Feb. 3, I will be there with my truck. I will put up the time.

[moregrip]

Sub 14 sec. that's sweet. Sac Raceway starts Wed. night drags Feb. 3, I will be there with my truck. I will put up the time.

looking forward to the results! I am also interested in hearing your thoughts on how the Procharger drives on the street.

[wentbig]

I love it. I started with a B-1 Procharger@12# on my Harley I went from 100-162 HP. The Procharged Harley gets 38 mpg and the non Procharged Harley gets 35 mpg. They have the new cut gears now there is no way you can here it with the hood closed. Driveability is excelent. The thing that bugs me is the blow-off valve is sent into the engine compartment with a little filter to try to silence the hiss but it sounds like a sandblaster at vacume. My truck was slow off the line till 3000rpm, everybody said you should have got a PD blower, after the 3000 stall converter with a flash of 3300rpm I can launch at 8#. You know how the centr. loves the rpm. I wish my valve train would take 7000 rpm because the blower would go there. I am injecting 50% ethanol with the big nozel from the cheepass AEM kit, I get my ethanol by removing the 15% gasoline from E85 fuel. I never see EGT above 1550 without Ethanol 1900.