Has anyone run two identical turbos using one for each 3 ports and then teed together to the air cooler?
My son drove a Peterbuilt last wk that was setup like that with a Cat engine making 750HP. He said it would literally throw you back in the seat when you stomped on it.He also said the driver claimed he was getting 8.5mpg fully loaded which is pretty **** good for a semi.
Anyone see or hear of such a setup?

 

There was an article in Diesel Power a couple years ago about a ranger stuffed with a 12valve that was running twin hx35 turbos, that's about all I've ever seen.

 

This idea has really piqued my curiosity. It would seem that a modified ISB that is making twice the power of the stock motor, and twice the boost, two factory turbos running off half the cylinders would be running half the cfm, but boost and temp remaining the same. At least this is how I see it. It would be interesting to se two of the stock variables run in a 3 cylinder each configuration. Especially if you have the capability of a higher rpm motor. I think someone who has access to the compressor maps and ALOT more experience with this may have a better understanding and more appropriate input.

 

a crossover tube from the front three to the back three should help balance flow through the turbo's and help scavange pulses as well.

 

I'm kinda intrigued as well. It would seem like identical turbos wouldnt make more pressure. I could see more volume maybe, but not sure what that would exactly do, maintain max boost longer?

 

A high RPM motor would be where this is good, where a stock charger can't maintain the pressure because the engine is consuming all the air. This isn't our problem, for the most part. We are low RPM and are pressure-ratio limited. Like you said, each HX35 will be feeding half the volume at the same pressure. From most maps I've looked at, you will be in the lower efficiency islands, if you're even on the map anymore. Probably left of the surge line.

Now if you make those two hx35's feed a third hx35, that would be a bit more effective.

 

I was thinking more along the lines of one of the new 351 variable vane chargers. I think they would have a "fatter" map and work better with a lower boost volume than the HX35. I'm betting one of the smaller 9 cm. housings on the HX35 would work better than the larger ones.

 

I know someone put a pair of HY35s in parallel on a first gen and it was a dog, spoolup was very poor. I just don't see any point or benefit in doing it since compounding works so much better.