I thought i'd try a tower muffler on my tt .46 pro. I am running a APC 12x4 prop and with the stock muffler, the throttle response was fine. With the tower muffler it won't go past 1/2 throttle w/o dying. It seems that it isn't getting any back pressure from the muffler b/c when I disconnect the tubing from the muffler it acts exactly the same. Anyone have any suggestions as to how I could fix this?

P.S. What RPM is everyone getting with this engine/prop combo?

Regards,
Philip

I guess as a first step I would check the pressure nipple on the muffler to make sure that there actually is a hole in it. It could be that a bit of manufacturing debris is in it or that the hole was never completely drilled through.

I run the TT.46PRO with a Tower muffler and a 11 x 5 APC prop. I havn't tached it lately, but I did when I first put the Tower muffler on...... it boosted overall output about 5-600RPM, if I recall. I think it turns around 13,500, but as I said, I might not recall the exact numbers.

Anyway, it sounds to me like something may be wrong with your new muffler.

Thanks, I'll check that right NOW!

Regards,
Philip

Well, FlyinHigh, you were right! It worked great after I cleared out the pressure nipple. The tower muffler boosted RPM by 600! My tt .46 now turns an APC 12x4 @ 13600! I was hovering my Avistar(great hover trainer huh!) with no problem.

Regards,
Philip

hey use the performance spec. pipe i ganed 2,000 rpms
with 11x5. 13,000 to 15,000