Fe 427 hp?

[blykins]

That's not out of the ordinary for a rear wheel dyno. Cobras suck a lot of power due to the restrictive exhaust and the driveline losses.

It's not uncommon to lose 100-125hp from the flywheel to the rear wheels.

[Ibr8k4vetts]

Originally Posted by blykins

That's not out of the ordinary for a rear wheel dyno. Cobras suck a lot of power due to the restrictive exhaust and the driveline losses.

It's not uncommon to lose 100-125hp from the flywheel to the rear wheels.

restrictive exhaust, I don't understand that term Can you please tell me how almost straight pipes are restrictive? I'm NOT trying to be a smart azz, I just don't understand.

[cobred]

The side pipes look huge on the outside but its on the inside that counts. My 1st set had 2" pipes with a baffle so I had 4 2" primaries going into a 2" pipe, very restrictive. Then I went to a set with 2.250 glass packs and now have 3" glass packs. I did other work so I cant tell how much the pipe changes added.

[blykins]

Originally Posted by Ibr8k4vetts

restrictive exhaust, I don't understand that term Can you please tell me how almost straight pipes are restrictive? I'm NOT trying to be a smart azz, I just don't understand.

If you look at most Cobra exhaust systems, you'll see that:

1. The headers go into sidepipes. It's a very sharp 90° bend in that area. Also, the headers don't have collectors, but the sidepipes do...essentially after that sharp 90.

2. Most Cobra sidepipe mufflers are tiny inside. They're about 4" on the OD, but you probably couldn't roll a golf ball through most of them. Very restrictive for the engines that are making 450-600hp.

I think it was Ernie (Excaliber) that said this...but he had his car rear wheel dyno'd. He made one pull, then pulled the sidepipes off and made another pull. It gained approximately 100hp.

[Dwight]

this is what you find inside most Cobra sidepipes.



and this is the fiberglass that is used