As a new forum user have read about header specs such as Long/Short,
Coated/Uncoated (Ceramic, etc.). Any advice on best ones for street/
performance use. Corsa Indy's likely with new headers.

Thanks,

 

We use the RKsport long tube's a lot. We have seen as much as 25-30 rwhp gain on heads and cam cars, and made as much as 360 rwhp on a vette with just the bolt on parts and no cats. Shorties are fine but they do not make as much power.

 

Short tube headers are simply more efficient at getting exhaust out of the engine than the production manifold. These 'headers' are too short in length to perform the taks that long tube headers perform.
Long tube headers are not just longer versions of short tube headers. Their length has been determined by the timing of the exhaust and intake periods on the camshaft and the RPM band where the engine make max TQ.
Basically, a well desinged header connects three CAMshaft intervals in time. When the exhaust valve opens, a high pressure wave starts dwon the header. When the HPwave reaches the collector, it encounters a low pressure region. This causes a low pressure wave to reflect back up the header.
We want this low pressure wave to reach the cylinder at the same time the intake valve opens. This low pressure wave can begin to draw fresh mixture into the cylinder even before the piston starts down on the intake stroke. Unfortunately, since the exhaust valve is open, it draws fresh mixture into the exhaust pipe. Fortunately, this mixture is pushed back into the cylinder by the HP wave which follows.
Meanwhile, back in the collector, the high pressure wave has reached the end of the collector, and encounters a restriction we normally call the exhaust pipe. This HP wave reflects off this restriction, and runs back up the header. We want this HP wave to arrive at the exhaust valve just before it closes so the HP wave can push the fresh mixture which entered the exhaust back into the cylinder. Thereby achieving greater than 100% volumetric efficiency.
Summary: short tube headers are just less restrictive than production
manifolds, while real headers actually extract energy from the pressure waves which exist from the 4-stroke nature of our engines.

 

How much rear wheel horsepower gain on long tubes with stock engine? Anyone dyno? Just need to know if its worth the $$$ TIA!

 

Thanks for the info.
I see by your signature that you have TTS LT Headers.
What qualities of these headers made you choose them
over the others?

Mitch

 

Look at the new Bellanger long tube from XTREME motorsports I just swapped out my TPIS for them there is an amazing low and mid range boost over any C-5 long tube and I've used most of them.

You can contact XTREME @ 480-517-4969 there hand assembled and like TPIS are 1 3/4 and these have a Tri y design for lots of power.Nate will be dynoining them them next month after he gets his new Dyno jet.

These install easier than the rest and the fit and finsh put TTS and TPIS to shame,get them for serios rrwhp.
Good Luck David s.

 

Has Nate at XTREME Motorsport left Lubbock and moved
to area code 480, where is that ?

Mitch

 

I believe that area code (480) is Phoenix and or a suburb.

 

The TTS headers have a bit smaller diameter tubing (1 5/8 instead of 1 3/4). On a bolt-on or heads/cam car this diameter tubing allows more than enough flow. The smaller tubing actually helps with lower and mid range hp and tq. The TTS headers are also a lot better built in my opinion. They have smoother welds, thicker flanges, larger diameter and thicker collector and the method they connect to the rest of your exhaust system is far better than the pressure-fit way the TPIS do it in my opinion.

I know others may have different views on the smaller diameter tubing but if you look at the hp figures in my sig I think you will see even with a high flowing agressive heads/cam package I dont seem to have lost any power at all. And to me, the lower and mid range power is more important It is the power that you feel the most often in all driving situations.

The TTS are a few bucks more than the TPIS but in my opinion they are worth it.

If you have any questions about them or want pricing, drop me an email.




[Modified by MattG, 8:47 AM 10/18/2001]

 

MattG,
Do you have an estimate what gains would be seen on a stock engine with vortex and Corsa's

 

I believe chrislee2 on the forum gained like 23rwhp and 20rwtq with the install of the TTS Long Tube Headers. He has been very impressed with the performance gains they gave him. I am not sure if he will reply to this thread or not but I know he had the dyno sheets scanned as well.

I am not aware of what increase they gave me by themselves because I installed them at the same time as my heads/cam. I do know that I have noticably more lower end torque than a friend of mine's car with the EXACT same heads/cam package that has TPIS headers.