[SD455DJ]

Originally Posted by Lloyd-TX

On another note, I've been wondering "out loud" how much RW power and torque would be lost if you were running gennie OEM or Waldron mufflers? I am so very partial to the old school oval reverse flow mufflers on a non-catalyst car!

Would Tom Hand have any information in this regard?

Lloyd, The only 'real world' comparison I have is with my RAIV Judge. It had an old Maramount (sp?) system (kink-bent 2 1/4" with 20" case 'turbo' style mufflers) and with the original motor ran 13.70's at 103 mph average. I swapped in a Torq-Tech 2 1/2" mandrel bent system with 18" long DynoMax UltraFlo mufflers and the performance improved to 13.50's at 106 mph. I'm sure there is more potential gains and it has run 12.80's at 110 mph with the replacement RAIV engine (borrowed from another RAIV GTO) with the same exhaust system.

I believe there is at least a 10-15 RWHP reduction going from DynoMax UltraFlo's to the SuperTurbo's, and another 10-15 hp reduction going to the factory (Waldron/Gardner) mufflers.

It would be an interesting test.

Dennis

[Lloyd-TX]

Originally Posted by SD455DJ

Lloyd, The only 'real world' comparison I have is with my RAIV Judge. It had an old Maramount (sp?) system (kink-bent 2 1/4" with 20" case 'turbo' style mufflers) and with the original motor ran 13.70's at 103 mph average. I swapped in a Torq-Tech 2 1/2" mandrel bent system with 18" long DynoMax UltraFlo mufflers and the performance improved to 13.50's at 106 mph. I'm sure there is more potential gains and it has run 12.80's at 110 mph with the replacement RAIV engine (borrowed from another RAIV GTO) with the same exhaust system.

I believe there is at least a 10-15 RWHP reduction going from DynoMax UltraFlo's to the SuperTurbo's, and another 10-15 hp reduction going to the factory (Waldron/Gardner) mufflers.

It would be an interesting test.

Dennis

Thanks for the information, Dennis. Take care.

[SD455DJ]

Hmm...come to think of it, I have a pair of new (probably close to 15 years old now!) in the box 20" DynoMax SuperTurbo mufflers (17749) that are 9 3/4" x 4 1/4" ovals by 20" case length. The UltraFlo's have the same oval dimensions, just a shorter 18" case. I read that the Dynomax SuperTurbo's can support up to 700 cfm and the UltraFlo's up to 2000 cfm. That gives you an idea of the restriction built into the Turbo muffler "S" shaped flow path vs. the straight through of the UltraFlo. I'm quite sure there would be a performance penalty changing to Super Turbos's. I plan on using the 17749 mufflers on my '71 Bonneville (stock 455 4-bbl) when I upgrade from the teenie 2" system with Midas choker mufflers that is on there now.

Thanks for the compliments Lloyd!

Dennis

[SD455DJ]

Finally got the correct black air cleaner lid to replace the old beat up chrome lid on it temporarily. Now it looks like what a 330 hp 400 should in a Tempest/LeMans.

Dennis