- This kit can safely support 750HP to over 1000HP depending on turbo and fueling configuration
- Proven to increase fuel mileage 1-2 MPG during daily driving and 2-4 MPG during towing and highway use
- Unsurpassed EGT control, reductions over 200F are common in mild applications
FREQUENTLY ASKED QUESTIONS
1. Aren’t compounds for race trucks?
No, absolutely not. A properly size compound system can drastically improves every performance aspect of your truck. A turbo charger has a fairly narrow efficiency range (a set of operating conditions that yield a good amount of boost for the amount of exhaust used). The stock charge is pretty efficient at the low-mid range of power that the engine makes from the factory. Above that range, it requires exponentially more power to spin. Thus by letting the atmospheric turbo in a compound system do the top end work, the engine becomes much more efficient which yields more power to the tires, lower EGT’s, better MPG’s, longer engine life, etc.
2. How long should I expect the install to be?
This setup installs extremely efficiently for a compound system. We generally recommend customers set aside a day to do the install so they don’t rush it. 6-8 hours is typical.
3. Do I need to buy anything additional to be able to install this system?
No, this is a turn-key setup that only requires simple hand tools and knowledge. It comes with extensive instructions so once you start the install, you should not have to go to the hardware store, the auto parts store, etc. Note: if you have some sort of “out side the box” mods done to your truck, it’s always a good idea to check with us prior to purchasing this setup.
4. What size exhaust should I use?
We’ve found that 4” works quite well and keeps drone in check. That being said, the second turbo works much like a muffler and significantly cuts down individual cylinder fire. Generally all you can hear over anything more than a few PSI of boost with compounds is boost.
5. Is my factory turbo really going to work in this setup?
Yes absolutely - the factory charger is setup perfectly for compound systems making up to about 700HP. It has a smaller turbine housing which works great for low-end spool time and a large internal gate which works great for bypassing enough exhaust flow to the atmospheric turbo.
6. Where is the waste gate?
The waste gate is built into your factory charger. It is critical to any compound system as it allows the primary turbine wheel and housing to be small for good throttle response. It allows this to happen by bypassing exhaust flow around the primary turbo in the mid-top RPM range so the atmospheric turbo can do its job. If you’re considering a compound system without a waste gate, don’t.
7. Do I need bigger injectors or any other increased fuel delivery to run this system?
That depends on how much power you want to make, more specifically what you want the truck to do. This system works great at 300-750HP. If you’re looking for a tow oriented setup that makes great power and are looking for a 300-600HP truck, then we would recommend a S471 with the stock charger. If you think you’re going to shoot for 500-700HP we’d recommend the S475 with the stock charger, swapping in a small S300 based charger later can take the S475 to over 750HP. Lastly if you have a highly modified stock charger and/or are planning to swap to mid sized S300 charger in the near future AND are concerned mostly with peak power, we would recommend the S480.
8. Do I need an aftermarket exhaust manifold?
No you don't; we have found that the factory exhaust manifold works quite well with factory turbos at around 700HP and less. That being said: there is some room for improvement at the collector area of the manifold, so a properly designed aftermarket manifold could contribute some to performance.