Quote:
Originally Posted by Silverbullet
I ran a QTP cut out a few years ago. It was a great system. Be cautious though: some tracks require exhaust exits to go through a muffler if you plan on tracking.
Actually, there will be huge HP gains over a stock exhaust. This is best used for a street car driven in an area where the law is not friendly with modified exhausts. It will allow you to run a stock cat back to not draw attention to the local police, but without sacrificing exhaust flow from just a click away.
What do you mean by modern engines? Despite all the new computer integration with many new cars (NOT including SR20DET), all fluid flow properties still remain in the piping system of the exhaust no matter what engine it is.
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The HP gain is almost unoticable imo.
The only time on my KA I felt it was in the higher speed range. Like acellerating on the freeway in mid 4th and 5th.
Most of us wont be tracking cars at that speed and Last time I checked, only fanboys are pretending to run the wangan.
I didnt feel a real difference during SCCA or drift events where you're never really over 3rd gear.
Removing my AC did more for me I felt (Throttle response and RPM's rise better).
Alot of people I know now run stock exhaust. myself included.
And the people that are running huge straight pipe setups at the track just get annoying. Everytime they come by it deafening to the spectators and makes our jobs as instructors harder as well.
SCCA also has limits on DB's.
When I say modern engines,
You used to be able to open up the header like the old hotrods from the 50's and really feel a difference. The whole freeflow theory. But modern engines aren't designed the same.
Its different having everything fuel injected with a MAF and vacum lines.
Its not a carborator on the top, and headers on the bottom, and the faster you get air in and out the better.
I've noticed that back pressure actually helps me in the lower end and lower gears on my KA.
As were my different datsun 510's, L16 and L22, did good with straight pipe exhaust and a weber carb.
once again, my
from building and racing, mild datsun and nissan cars for 14 years.
I've gone back and forth on it. And found its just not worth the noise and headache.
The money and effort would be better used on headers if you want to work on your exhaust line.
And nowdays, the older guys in the know will tell you the HP gain for headers on a KA arent worth the $150.
[/quote]Actually, there will be huge HP gains over a stock exhaust.[/quote]
huge?? like,.....3hp?? 5hp?? 7hp?? anymore than 7 and your fooling yourself. advance or retard your dizzy depending on what racing your doing and you will feel more difference. (IMO)