Designed to do dif things??? The 2 turbo is designed to move air. What's the tow power designed to do. Flow water??
The compressor wheel that was originally used in the II turbos (and what I understand as to still be used) is from a turbo called the K31. This is a Billet 7 blade compressor wheel. It is a good compressor wheel. We actually used it originally in our Tow-Powers. The wheel currently used in EDE Tow-Powers is a Billet 6 Blade compressor wheel made by Precision Turbo. It has a 71mm inducer (same as the II & K31) but a much smaller exducer. When Precision turbo designed this wheel we decided to try it out and I was so pleased with how it ran over the K31 wheel that we stopped using the K31 wheel at that time.
When I referenced that they were designed to do different things what I meant is that each wheel will was designed to produce maximum airflow and efficiency at different ranges. The K31 wheel is designed for a high pressure ratio (high boost). Typically 7 blade wheels perform better at high pressure ratios. 6 blade wheels typically are better for lower pressure ratios. If the wheels were exactly the same as each other in size other than 6 vs 7 blade then the K31 would most likely perform better as a single (running more boost/pressure ratio) than the 6 blade. Since in a compound setup each turbo runs a lower pressure ratio the ideal setup is one that has a compressor wheel that is designed for a lower pressure ratio. This is one reason the 6 blade wheel we use performs better.
Since the wheels are not the same size as the above reference, there is another reason that the wheel we use is better, which is that the exducer being smaller on the Tow-powers allows more total airflow. Since the atmosphere turbo is responsible for delivering all the airflow (in a compound setup) then it makes sense to use a wheel that flows more for the same equivalent size and pressure ratio.
I never said I do t want to buy from elite. I never said I would rather buy from mpd. Those are assumptions sir.
You are right. This was an assumption on my part based on most of your posts. I apologize if I mistook your stance.
I simply said I would rather do the 2 atmo and the batmo wheel in the HP for the same price as the lp. It would make more sence to me personally to have to modified turbos than one no matter how special the compressor wheel design is.
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Since the most important turbo in a compound setup is the atmosphere turbo, most turbo gurus would agree that you should spend the largest portion of your money on the atmosphere turbo (if power and lower egt's are your goal). Your above plan will work but not better than the Tow-Power atmosphere since the total airflow will still be less (regardless of the batmo hp wheel).
I am not bashing on your ideas I am just trying to inform others. Since many people are looking for answers to this question (what turbo for my 6.4?) I am trying to clarify things. I hate to see people spend money on something that doesn't perform as they expected. Is the precision wheel worth the extra cost? That depends on your goals and budget. Is a 6.4L worth the additional cost over a 6.0L? That is up to the end user and his budget. If you are going to spend the same amount of money why buy the 6.0L and upgrade it when you can just buy the faster 6.4L. The same approach can be placed on this turbo discussion.
The Precision wheel is the result of technological advances that have been made in the many years since the K31 wheel was designed. Just as the 6.4L is to the 6.0L.
