Promod blowers?

I have seen dyno tests using the same motor with two different blowers swapped to compare the DMPE M5 to the Kobelco K-11 Superman at 20% OD NHRA legal setup The DMPE M5 made the most boost and the most horsepower. The question is how much $$$horsebucks$$$ do you want to pay and how competitve do you want to be. The other option at a little less money is the DMPE M4. The big difference between the M4 and the M5 is that you can change the top plate configuration on the M% and the M4 is fixed. If you want just a NHRA 20% configuration then the M4 will do you just fine.

 

Part Two...sorry just read your post again. At 20% OD at 8000 RPM you can make 40+ lbs boost with the M5. As far as restripping will depend on if you use Prizm Gel spray in your blower or not and how rough your competition is. I would say every 12 runs would be best. You will have to watch your boost and see when it falls off.

 

Probably does because it allows for better sealing inside the blower so the boost is a little higher.

 

Some thoughts on blowers for 20% OD NHRA. Like I said before first you are going to have to decide on how much money you can afford and how competitive you want to be. The blower, the length of the top opening in the blower, the hat, and the spacer between the hat and the blower is where the power is. All needs to be matched and adjusted for max boost. I believe that one pound of boost is equal to 150-170 HP and I might be a little conservative in my estimation. Some of these exotic blowers mentioned in previous posts can only be leased for a race at a time and I believe you would have to have very deep pockets or a great sponsor to afford the cost of the lease. You don’t even get to touch the blower or the hat. It is put on for the race then disappears after the race. I believe that Al Billes was the first one to start doing this and now others have followed. This is a great way to keep the modifications secret and to keep in business. The Chuck Ford blower (CFH) claim to fame is in the billet case. The billet case corrects the inaccuracies of the cast case so that the rotors fit better and the clearances are the same from front to back. It appears from the outside that the Chuck Ford blowers is a billet Superman or very close to it. As was said these have an $18000 price tag. I have heard that the blower sold by Troy is in fact a Chuck Ford CFH blower. If not then somebody correct me. The DMPE M4 and M5 both have the same X3 rotors and the big difference is that the M5 is more tunable because of the removable pieces on the top. The M4 is fixed on the top. The M series blowers have a cast case but also can be ordered with billet cases and are yours to keep. The M series cast cases are very accurate in tolerances from front to back. The regular K-11 Superman is a very affordable 20% OD blower but does produce a little less boost. There are guys that can modify the Superman to get some more boost BUT by the time you buy the blower and pay to get it modified you will find that the total cost is the same as buying a new M5 and the M4 would have been a little cheaper and the M series would have still produced more boost.

 

So who makes/machines Troy's rotors? You are saying both Chuck on Troy use Chuck's billet cases and Troy's rotors? Can you own one of these blowers or are they all leased? If you can own one for $18000 then what is different to the one they only lease and you never see inside?

So who else has NHRA 20% competitive blowers. We have the Troy and Chuck blowers amybe in more than one version, the different modified M4 and M5s? What is Al Billes have for a blower these days?

As far as horsepower per one pound of boost while just laying in the dental chair I realized I had put the one in front of the numbers. I figured it out to be 50-70 hp per one pound of boost but it is not linear because of the power required to turn the blower and the heat generated as you turn them faster.

 

I believe M5 allows the whole top to be replaced to change the location and size of the inlet where as the M4 just allows you to adjust the size of the inlet. The M5 also allows you to change the bottom and the outlet.