Engine/Transmission (1998.5 - 2002) Mach 4's and a Phat Shaft 62

[JMachemer]

well i am trying to decide if i should buy the Mach 4 injectors and Phat Shaft 62 turbo for my truck. I want to know if the set up will be street and highway friendly - for my wife too when she gets the keys. I made up my mind i will not tape the wire for my Comp box - just keep it set up for an EZ. I was hoping to get some feed back from the fellas running about the same setup i am looking to buy. Is it a good combo to run with the Comp box turned off too? Or is it more efficient to run with the Comp turned on?



also, what kind of quarter mile time can i expect with the injector and turbo combo? The sales tech from Performance Diesel Warehouse stated that my truck would sit right around 400 rwh if i got those items for my truck.



any advice would be helpful. Thanks

 

[JR2]

Well I have M4's and an HX40 along with a wire that is tapped and the Smarty. My wife does not like to drive the truck with everyting set to max, but with the comp off or set on 1x1 it behaves on the street just fine.

 

[DonS]

I have the Mach 4s, stock turbo, Smarty, and a Drag Comp.



The ECM is programmed with Smarty's #8. For city driving, I turn the Comp off. Too much smoke / "jerking" otherwise (though the Comp is nearly always on 5x5 - maybe that has something to do with it).



With just the injectors and Smarty #8, it's quite street-friendly. I did have to get used to the OFE, though.

 

[OPoole]

I ran the mach 4 and HTT 62/12cm turbo with edge drag box. Drove around on 2x2 most of the time great power. Made 500hp on 3x5 530hp on 5x5. With no wire tap you should be 415-430hp and have no problems with heat. If you have not got a turbo yet i would be gald to help you out with a HTT. You will need a new HX-40 down pipe.

 

[JMachemer]

can i expect my fuel milage to stay about the same or go down? We do take the truck on long highway trips sometimes and am curious if i will be sacraficing highway MPG?



also, i have the stock air box with a drop in K&N filter. Is that set up going to be ok if i get the bigger sticks and turbo? Or am i also going to be needing a new intake system? I like the stock set up so i can see the indicator for the filter.

 

[Jetpilot]

The setup you are looking at is the exact one we use on our shop truck. That setup will yeild around 450 RWHP untapped or 500-525 RWHP tapped. Your mileage should remain constant unless you are mashing the go pedal to the floor all the time. As for your air filter I would upgrade it from the OEM airbox, the AFE units use the same filter minder your current setup uses.



Doug Smith

 

[OPoole]

On long tips i got 530-550miles on a tank with 4s and HTT 62mm. Auto with 3. 54 running 70-72 with a few stop light races. If you keep you stock air box just drill a few 1" holes in the lower part. AFE intake system reuse the filter indicator also but will be louder in the cab.

 

[DonS]

AFE intake system reuse the filter indicator

Mine won't, unless I drill a big hole in the aFe's snorkel.

 

[JMachemer]

HP and Torque number game

I have been looking at the results for the Fall Brawl and Spring Fling this past year and am trying to figure out why the numbers are sometimes so different for trucks. For instance a truck pushing 405 hp had 948 tq. and a truck having 412 hp had less torque at 815 ft/lbs. Both trucks were dodges - one was a 2000 the other a 2001. Anyone able to expain this one?

 

[OPoole]

DonS I use the AFE stage 1 it has a hole for it. Which AFE do you have?







Could be a lot of things riding the brake, diff turbo spool faster or slower change TQ. Tire size, gears, what rpm they started dyno pull at?

 

[Jetpilot]

I have been looking at the results for the Fall Brawl and Spring Fling this past year and am trying to figure out why the numbers are sometimes so different for trucks. For instance a truck pushing 405 hp had 948 tq. and a truck having 412 hp had less torque at 815 ft/lbs. Both trucks were dodges - one was a 2000 the other a 2001. Anyone able to expain this one?

Could be lots of things from turbo design/size, injectors, box and or boxes, VP health, setting on box, etc. Normally we see lower TQ numbers on a truck with a much bigger turbo due to spoolup time VS. rpm. But in the above mentioned case there are just too many variables.



Doug

 

[DonS]

DonS I use the AFE stage 1 it has a hole for it. Which AFE do you have?

Stage 2 (see sig in first post above).



Big metal box, big molded plastic snorkel from box to turbo. No hole for filter minder.

 

[DonS]

Could be lots of things from turbo design/size, injectors, box and or boxes, VP health, setting on box, etc. Normally we see lower TQ numbers on a truck with a much bigger turbo due to spoolup time VS. rpm. But in the above mentioned case there are just too many variables.

Not the least of which is where in the RPM range peak torque and HP are made, and the shape of the torque curve.



Two trucks with the same peak torque at the same RPMs, but where one's torque drops off faster, will have different peak HP numbers. The one whose torque drops off more slowly will have a higher peak HP.



EDIT: unless torque drops so fast that the "RPM multiplier" is unable to let HP keep up (or keep climbing). Then peak HP might be at the same RPM point as peak torque.

 

[MSalvatore]

is the above mentioned setup safe for towing?

 

[bbodammer]

well i am trying to decide if i should buy the Mach 4 injectors and Phat Shaft 62 turbo for my truck. I want to know if the set up will be street and highway friendly - for my wife too when she gets the keys. I made up my mind i will not tape the wire for my Comp box - just keep it set up for an EZ. I was hoping to get some feed back from the fellas running about the same setup i am looking to buy. Is it a good combo to run with the Comp box turned off too? Or is it more efficient to run with the Comp turned on?



also, what kind of quarter mile time can i expect with the injector and turbo combo? The sales tech from Performance Diesel Warehouse stated that my truck would sit right around 400 rwh if i got those items for my truck.



any advice would be helpful. Thanks

My truck is similar to yours but I have the wire tapped. Mileage actually increased if I run the comp on 1x1. I also tow about 6k on a daily basis and push snow in the winter. Temps are not an issue at all. I was worried going with the 4's, but glad I did b/c they have plenty of smooth power and also run clean and cool