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Pro charger stage 2 boost issue

JadedGT

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will a 5" pulley fit? I am assuming stage 2 right, i thought the biggest they shipped with was 4.75?

The cool thing about any belt driven system is no spike's. Once you are set with the right pulley a boost gauge seems pointless imho... That is as long as you keep your belt tight. I run it cause I do see spikes but that is because I have been messing around a bit... :)
Friend has a 4.88 pulley with his stage 2 kit. I am running a 4.75.
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ProChargerTECH

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P1SC1 STG2 = 4.75" pulley = 10psi @ 7,300 rpm at 1000 feet

The largest pulley I know to fit under the hood is a 4.88"

My rule of thumb is that D1SC is about 3-5psi HIGHER then a P1.
At the same pulley size, and same RPM.

Personally I don't like the idea of to much boost.
Because then you have to pull so much timing to keep it safe, the power flat lines.
Or limit the RPM to say 6,800 to keep the boost down.
 

MyLilPony

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Don't get greedy ... i did. Once. Not good. :D
Yeah I have been good :) I leave it set at 11.6 and depending on the gear I'll see it spike to 12/12.3. Usually only spikes in second and at the top of my rpm 7750. I think a 38 mm WG might be too small so I may go 45 and call it good.
 

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P1SC1 STG2 = 4.75" pulley = 10psi @ 7,300 rpm at 1000 feet

The largest pulley I know to fit under the hood is a 4.88"

My rule of thumb is that D1SC is about 3-5psi HIGHER then a P1.
At the same pulley size, and same RPM.

Personally I don't like the idea of to much boost.
Because then you have to pull so much timing to keep it safe, the power flat lines.
Or limit the RPM to say 6,800 to keep the boost down.
So I have a D1SC stage 2 kit. Which pulley do you recommend to keep the boost as low as possible? I believe I have the 5.00, 4.75, and 4.38. I live in Atlanta, so ~1000 feet above sea level.
 

dubster99

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Not sure exactly what the problem with the design of the boost box was, but I know multiple people that had the same issue with it. The new one is out, so as long as you got the new one you should be good to go.
 

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MyLilPony

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So I have a D1SC stage 2 kit. Which pulley do you recommend to keep the boost as low as possible? I believe I have the 5.00, 4.75, and 4.38. I live in Atlanta, so ~1000 feet above sea level.
5.0 if it will fit. Otherwise 4.88. 4.75 will put you at about 11/12 above 6800 and it will climb from there.
 

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P1SC1 STG2 = 4.75" pulley = 10psi @ 7,300 rpm at 1000 feet

The largest pulley I to fit under the hood is a 4.88"

My rule of thumb is that D1SC is about 3-5psi HIGHER then a P1.
At the same pulley size, and same RPM.

Personally I don't like the idea of to much boost.
Because then you have to pull so much timing to keep it safe, the power flat lines.
Or limit the RPM to say 6,800 to keep the boost down.
See this is what i dont understand,i have the 4.75 pulley on my D1 and i used a mechanical guage to check my boost.On multiple passes the most boost i seen was 10 psi at 7k and it barely made that.I didnt want to go past 7k so i did quite a few pulls to that.I just dont get it,everyones boost is all over the place.Lund also stated it looked like i was right around 10psi.
 

JadedGT

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See this is what i dont understand,i have the 4.75 pulley on my D1 and i used a mechanical guage to check my boost.On multiple passes the most boost i seen was 10 psi at 7k and it barely made that.I didnt want to go past 7k so i did quite a few pulls to that.I just dont get it,everyones boost is all over the place.Lund also stated it looked like i was right around 10psi.
Different elevations and different quality of fuel. I am in Texas and it is flat here and our fuel is usually pretty good in my area.
 

ProChargerTECH

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So I have a D1SC stage 2 kit. Which pulley do you recommend to keep the boost as low as possible? I believe I have the 5.00, 4.75, and 4.38. I live in Atlanta, so ~1000 feet above sea level.
Whatever the largest you can fit under your hood will = lowest boost.

See this is what i dont understand,i have the 4.75 pulley on my D1 and i used a mechanical guage to check my boost.On multiple passes the most boost i seen was 10 psi at 7k and it barely made that.I didnt want to go past 7k so i did quite a few pulls to that.I just dont get it,everyones boost is all over the place.Lund also stated it looked like i was right around 10psi.
We use lab grade sensors here, that are calibrated for our industrial testing.
So, if there is a "boost" or "pressure" sensor I trust... its what we use.

As far as what everyone else see's.... well here are some variables.
- Different RPM's
- Different Cam Timing in Tunes
- Different air filters
- Different pulley sizes
- Different altitudes
- Ect.

So again, just a simple cam timing change can make the boost swing 3-5psi..... so ya,.....
 

Tommy V

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Whatever the largest you can fit under your hood will = lowest boost.



We use lab grade sensors here, that are calibrated for our industrial testing.
So, if there is a "boost" or "pressure" sensor I trust... its what we use.

As far as what everyone else see's.... well here are some variables.
- Different RPM's
- Different Cam Timing in Tunes
- Different air filters
- Different pulley sizes
- Different altitudes
- Ect.

So again, just a simple cam timing change can make the boost swing 3-5psi..... so ya,.....
Wow ok guess that makes sense,i didnt think cam timing would make them kind of changes in boost pressure,but thats why im not a tuner lol.Explains why everyone is seeing different boost levels,besides the normal factors.
 

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ProChargerTECH

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Wow ok guess that makes sense,i didnt think cam timing would make them kind of changes in boost pressure,but thats why im not a tuner lol.Explains why everyone is seeing different boost levels,besides the normal factors.
I had a guy on the dyno the other day that was talking about it....

And I said.... move that cam 4 degrees and tell me what happens to the boost.
He was like...

"holy crap, it added 3 psi"....but didn't change power.

And I was like "exactly" cause you changed the restriction on the motor, but hurt its ability to make power.


Technically you want the LOWEST boost number possible, with the highest horsepower output. :)
 

Tommy V

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I had a guy on the dyno the other day that was talking about it....

And I said.... move that cam 4 degrees and tell me what happens to the boost.
He was like...

"holy crap, it added 3 psi"....but didn't change power.

And I was like "exactly" cause you changed the restriction on the motor, but hurt its ability to make power.


Technically you want the LOWEST boost number possible, with the highest horsepower output. :)
I agree with that,i would rather have a little less boost with more timing,than vise versa:headbang:
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