Yep, you read it right, I'm testing out an exhaust tip. After lengthy research about turn-down tips, the general idea is that they make some power. How? Because the angle of the tip allows the air traveling underneath the car to "pull" the exhaust thru the system more efficently. Last night I bought a cheap $3 turn-down tip for my stock muffler and painted my whole muffler black. Now you can't see anything There's even less exhaust noise. I don't feel any difference in power, but my butt-dyno has never been that good.

Tonight at the track, I will be testing the Poorman's CAI 2.0 which is an added intake pipe on the air box that pulls air from behind the driver's side headlight. I'll also be testing the "questionable" turn-down tip. The weather is a bit warm (80 degrees), but the humidity and wind is pretty low. I'm praying for a 14.6 or just an improvement on my 94mph trap speeds.

When it comes to mods, let's just say I'm pretty minmal in my approach to performance. I only use what truely works. I'll keep you guys updated.



Dave

 

Maybe thats how the 5th gen AE muffler gets the more power? It faces down.....

 

Hmm..I wonder if you take the headlight off, how much more power you could get. It's a track only mod, but it's worth some experiment.

 

I know a few guys in here have tested without the headlight and it didn't help. Turbo and SC cars benefit from pulled headlights because their motors are so temperature dependant. I don't think you'll notice any difference if you already have fresh air coming in. NA motors don't pull in the massive amount of air like turbo/SC cars do.


BTW, the turn-down tips are also known as "scavenger" tips. They aren't exactly pretty, but it appears they are effective. I think is one reason Nissan went with this design. Have any of you noticed how many premium late model cars are going with this design? I think they do this for both performance and a much cleaner look. IMO, the big tip thing has gotten way out of hand and I kinda wanted that sleeper look plus I couldn't stand that little 2 1/8" pea shooter exhaust looking at me


Dave

 

Good luck tonight at the track Dave.

I never knew a tip would do much. I did realize that a few companys make an exhaust tip that you can "tune". I mean by adding and removing shimes. Anyone see it?

 

It's made by Supertrap -- at least that's the only truly tuneable muffler I know.

 

Tonight was a bust. I couldn't get any better than a 2.28 60 foot (most were 2.30). I was extremely consistent and I should have been bracket racing. I ran a 14.93, 14.91, 14.88, and a 14.90. What was disappointing was my trap speeds. They were consistently in the low 93mph range. Conditions tonight ranged from 81 degrees down to 70 degrees. This about 25 degrees warmer than I've ran in this year. I'm really starting to hate the 4th gen VQ alumninum intake manifold. The thing was baking hot after having to wait 40 minutes in line. The only thing I did differently with my setup was leave my rear tires at 30psi vs 42 psi. Oh well, can't win then all I guess.

What was really sad was the fact that nearly every LS1 F-Body was running well into the 14s and not even hitting 100mph trap speeds. Only two LS1s broke into the upper 13s. There were also two LS1s that were running mid to low 12s, but they were juiced. My friend was nailing 12.8-13.0 with his 95 Z28 with just headers, intake, cam, TB, catback, and drag radials. Most of the 5.0s were running high 14s and I saw a 99GT auto run a 14.7@95mph.


Dave