Bought a CC Dually 454 Whipple

[Supercharged111]

Yeah, the 6.0 MAF is the way to go. Just don't wire up the integrated IAT if boosting.

 

[BowtieBrody]

Yeah, the 6.0 MAF is the way to go. Just don't wire up the integrated IAT if boosting.

Interesting on the larger MAF and TB, I've only ever seen the BBK Throttle body for 454s, and never even heard of running a larger Mass Air Flow sensor.

 

[Christian Steffen]

I don't have a larger MAF yet, haven't been able to determine if its actually a choke point, I'll probably swap it at some point just to see.

On the topic of TB's and MAF's; don't mess with aftermarket stuff, just get used LS stuff, as Supercharged suggested.

 

[BowtieBrody]

I don't have a larger MAF yet, haven't been able to determine if its actually a choke point, I'll probably swap it at some point just to see.

On the topic of TB's and MAF's; don't mess with aftermarket stuff, just get used LS stuff, as Supercharged suggested.

Yeah, I figured the LS stuff would be cheaper, $330 or whatever it is for a BBK, or maybe $50 for a 6.0 or maybe an 8.1 TB? Would either of those work?
**** I need to research more.

 

[Christian Steffen]

Yeah, I figured the LS stuff would be cheaper, $330 or whatever it is for a BBK, or maybe $50 for a 6.0 or maybe an 8.1 TB? Would either of those work?
**** I need to research more.

As long as they are cable driven and have the same bolt pattern, it should work. I don't know which ones do for sure, maybe @Supercharged111 does? Either way, a different TB needs to be adjusted for in the tune.

 

[Supercharged111]

I have an LS1 TB to try out. Those are 78mm and have the same bolt pattern. I'm pretty sure the 99+ LS trucks were all DBW and I know the 8.1 was all DBW. Looks like stock can only be punched out to 78mm before the wall between the IAC cavity starts getting dangerously thin.

 

[skylark]

I have an LS1 TB to try out. Those are 78mm and have the same bolt pattern. I'm pretty sure the 99+ LS trucks were all DBW and I know the 8.1 was all DBW. Looks like stock can only be punched out to 78mm before the wall between the IAC cavity starts getting dangerously thin.

I know that 99-00 LS powered trucks were DBC. I believe that 01 is as well.

 

[Supercharged111]

I know that 99-00 LS powered trucks were DBC. I believe that 01 is as well.

You're right, they used a different color return spring than the LS1 and possibly different throttle arm now that I think of it. Gotta wonder if those can be punched out.

 

[Supercharged111]

So that's a no to punching out an LS1 throttle body, they have the same restriction as the Vortec throttle bodies.

I realize to those of you who don't tune, I'm probably speaking Chinese so here's a comparison of a log I took that plots RPM against throttle position and spits out a MAP value. Very useful for determining downshift points. As you can see, the 454 needs a lot more throttle angle to produce the same MAP as the 1500. This is the 1500 before the supercharger.

350:

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454:

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After some quick and dirty math, a 97mm throttle body on the 454 would act like a 75mm on the 350 so I think the 90mm Chinese TB is going to be my Huckleberry. I was worried it'd be too big, here's how I got there.

(75mm/350ci)=(X/454)

Solve for X, X=97. Probably not the most scientific method, but a ballpark at least. There's only about 400 RPM difference between the 2 engines and this one gets a bigger supercharger so I think I can justify the 90.

 

[Christian Steffen]

Probably want to use cross sectional area.

D1=Diameter of 350 TB
D2=Diameter of 454 TB

(Pi*D1^2/4)/350 = (Pi*D2^2/4)/454

D2= ((454/350)^(1/2))*D1=85.4 mm