First off... you put on NON-resonated. Big mistake, cause those pipes sound like straight a$$. Second... that smell you are referring to goes away after a few weeks. I've been pulled over 5 times since having my TPs on, and not once did the cop notice the "smell" or even how loud my car was when I pulled away. You are right about the gains, if you're car doesnt sound good, then no TPs are not worth it. But if you were to get resonated pipes, and have them on with a good sounding cat-back system, they are WELL worth it.

Test pipes are def. a gamble, I was worried as to how my car would sound when I put mine on. But honestly, giving them time to break in, your car will sound completely different in a month or two.

 

I disagree with non-resonated tp sounding like ***. That's a personal opinion. I also disagree with losing the low end tq and only gain 5whp. I feel after installing my APS TP with the PopCharger, 5/16 spacer, & pulley it freed up my tq. Also with those 4 basic mods I gained 17whp & 10wtq and feel most of it came from the spacer & tp.

 

OK -

1 - non-resonated testpipes don't really burn in or season...they are just pipe, and no resonator to season.

2 - The sound will not get 'better' over time. You will either get used to it, or your other exhaust components (resonators and mufflers) will begin to clog up more due to the excess gasses they are filtering, thereby lowing the sound threshold, and resultant performance.

3 - Straight test pipes, are usually used on open exhausts for racing and turbo applications - less restriction = more HP or boost.

4 - Cops wont smell your exhaust - your car will be stopped/off when they walk up to it, and likely be getting back in their car or on their motorcycle to realize or care anymore.

5 - Sound is completely subjective. Some like loud raspy high pitched exhaust, some like mellow to high pitched non-raspy, some like it low and mellow, some like it stock or even quieter. What sounds gold to one person, could sound like the worst thing on earth to another...so stop grading what other people like.

6 - RASP is something that happens when the pulses cannot line up properly and the car kind of burps...really that is what happens. Even if you like rasp, it's actually NOT a good thing performance-wise. It takes a LOT of HP to have a pretty open exhaust and not rasp.

Rick

 

BTW: I'm running stock headers, APS 2.5" TP, Stock cat-back and get told all the time from Z & Non-Z owners how great my exhuast sounds.

 

NOPE..the spacer itself with the intake will give you that result...almost to the HP and TQ value.

The crank pulley, as much as most people argue about them, will give you at least 5HP and 3-4TQ above all of that...and likely more. I've dyno's before and afters on the crank pulley alone, and saw up to 11HP and 8TQ on a stock car, and 3-4 more on each side for intake.spacer modified's.

It looks to me, based on what you've done, is actually loose some HP and TQ because of some combination - perhaps the TP after all. You may be flowing too much for your exhaust system to handle.

This would be my experienced and tested thoughts.

Rick

 

I disagree... It seems to me you are doing the mod by itself gains math; ie PopCharger say 5whp + Motordyne says 15whp must equal 20whp. Anytime you combined mods you won't get the same results if it on a stock motor. I still feel as well as my dyno tuner that these numbers are right on money. I don't think the pulley give any power gains but rather just smooth the powerband a bit for us.

 

No, that's not what I'm doing...if you knew me well enough, you'd know better....but think what you will....

Rick

 

I HATE the sound of my car now, I'm looking for some HFC to replace these TPs cause the car does infact sound like A$$. Are you saying that resonated test pipes will give more gains than non resonated? Also, will the smell go away with my TPs after some time?

Sorry for Highjacking and throwing these questions.

 

Well...testpipes and the wrong catback combination will likely give you that kind of sound....cccrrrraaappppyyy...

Sorry...but what exhaust do you have on the car?

The power diff from HFC's to TP's - as far as FI versions go is about 3-4HP less for the HFC's.

With testpipes, you always risk rasp...but the testpipes are not what usually bring the rasp - its the lack of efficiency the exhaust system has to handle the extra pressure and pulses.

Rick

 

This is what I wanted to mention before. There are tons of systems out there, and despite what people may say about exhaust being exhaust, which system you have makes a difference with the sound. Personally I have heard true dual systems with non-resonated pipes, and it sounds like a primered civic hatch with a coffee can muffler.

About torque loss... I don't have dyno sheets to prove my opinion, but there is definitely torque loss due to my pipes in the 2000-3500 RPM range. After 4000, the power kicks you in the *** really hard, so this compensates for any low end torque loss.

 

Exactly my point - many exhaust systems are not designed to properly handle other systems changes like headers, TP's, HFC's etc. Systems are made to work on STOCK configurations = once you change those parameters....anything goes. Companies that put out a catback, TP's and HFC's usually have systems that ARE designed to work together with those accessories as well.

Sounds to me like you have a bad matchup....but without a real before and after dyno - it's really hard to say. A smoother torque curve could feel like a loss compared to one that is not smooth...you'll feel peaks of torque increase, instead of a smooth flow of power.

Rick

 

Maybe theres a bad matchup... powerband wise. But I didnt do exhaust for power... its all about the sound in my book. And the sound is awesome. Power will come into play in about a year when I go with a built motor and some snails...

 

Cool...just realize it all does work together, and somtimes against, at some point...

Rick

 

I've gained 20whp from my exhaust resonated TP and crank pulley.

 

Sounds about right....

 

This thread has REALLY gotten off topic.

Anyone need non-foulers??? PM me for price details and such

 

Wouldn't this do the same thing?

 

possibly, but the hole on the end looks rather large compared to the non-fouler.

 

Guys just found these for whoever doesn't want to drill stuff and wont mind spending $36 for a set.. i would drill stuff out.. i know it says celica exhaust but it's a universal fit for s2000, 350z and most toyotas.

 

I've been selling non-foulers for $30 shipped. If I can get a few more orders I'll make the price $25 shipped. 15000 miles with mine and no SES light. If anyone wants a set, PM me or email me. salanci@udel.edu