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Help; narrowing down on upgrades.

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I think I'm finally ready to ask these questions.  I have decided to upgrade my 24v with a quadzilla adrenaline, injectors, compound turbo, and an exhaust brake.  I am not interested in rolling coal. I do not race but I do tow.  I like reliability and longevity.  My NV4500 has a 450hp clutch.  And I'm installing a new lift pump and lines.

 

I'd like suggestions on compound setup and which injectors to match them with.  I initially planned to build my own setup but now I'm leaning to buying a kit.  I feel like I want to be in that 350-425hp area.  If possible I'd like to keep air filter in place (corner of passenger cowl) but it isnt a deal breaker.

 

Thanks for any input.

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  • Turbo Terry
    Turbo Terry

    Ok my 2 cents Bosch 275 hp rv and a edge turned up is old school but it works. Stock turbo and and a bd e brake. 100 hp will wake it up just fine. Why reinvent the wheel. But if you had a auto instead

  • dieselautopower
    dieselautopower

    G is for gated the GXE and SXE are updated with many features for more airflow and longevity.   if your goal for peak power is 450HP then the 12CM would be of benefit,  there would be a

  • Silverwolf2691
    Silverwolf2691

    Smaller turbo is your friend for towing. 500hp is easily achievable with 150s, a quadzilla, and a 62/65/12 or 62/68/12. Larger turbine wheel will help on the high rpm end. If you are stuck on compound

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G is for gated

the GXE and SXE are updated with many features for more airflow and longevity.

 

if your goal for peak power is 450HP then the 12CM would be of benefit,  there would be a limitation for drive pressure, so if you want more peak power like 500HP then go with the 14CM, or 62/68/12 as the 68/12 and the 65/14 turbine configuration are similar in spool and flow.

 

basically there is a 50rpm difference in spool for 12cm vs 14cm. driving egt will generally be lower with a 12cm, but peak EGT lower with a 12cm.

 

If you have 3.55 gears, 35" tires then the 12cm will be better as that = pretty tall gearing and will be hard to spool

 

If you live at 5000ft then you probably want to go up a size on the compressor as there is not as much air to compress.

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    • Owner
    On 8/26/2021 at 7:00 AM, dieselautopower said:

    If you have 3.55 gears, 35" tires then the 12cm will be better as that = pretty tall gearing and will be hard to spool

     

    Yup. Optimal final ratio is between 3.55 and 3.73. With 35 inch tires on 3.55 is not good. Your final ratio is 3.21 with 35 inch tires. You most likely eat transmissions and have high EGT's. 

     

    Just a point to make I change from 265/75 R16 to 245/ 75 R16 (30.5 Inch tire) which now bring my final ratio to 3.69:1 on the Beast. This magic of final ratio helped me get my high point 28.04 MPG. Cruising RPM is perfect 2k at 66 MPH, for 550*F EGT's. Acceleration is fast that 3.55 final gearing and pull trailers for about 200*F less EGT's. 

     

    Big tires look cool but gotta be done right to make it work for you. You would need change ring and pinion to 4.10 for 35 inch tires. This would make your final ratio 3.71 to the ground. To give you a feel of 3.73 to the ground Thor is 265/70 R17 all the way around (stock tires) with 3.73 axles it cruise at 65 at 2,100 RPM. Just ditching the 275/75 R18 tires and wheels gained me a full 4 MPG getting back to the 3.73 ratio. 

     

    Improper final ratio makes huge problems period... Typically result in higher EGT's, high transmission temps, and higher coolant temps. 

    Edited by Mopar1973Man

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