Sound
 

Heay hopefully someone can help me. I installed in my 370z 2010 a magnaflow exhaust and just added test pipes with custom tuning. Power of the car got sooo much better but the only thing that is bothering me is the raspy sound that comes out of it especially when down shifting. Anyone know what i can do do fix this problem. Im looking for that roar sound, that raspy sounds sooo damn cheap.

Heey bro, great to see a member from Lebanon, that raspy sound most probably is caused due to the test pipes, if it is bothering you that much id advise you to have them replaced with either HFC or motordyne ART pipes, hope this helps :D

Non-resonated test pipes will cause this issue for many different exhaust systems. High flow cats will also cause this issue. Zuper is right, ART pipes are going to be your best bet.

Replace them with resonated test pipes. You do not need the more pricey art pipes to do this.

The ART's are resonated test pipes, but you're right, others can help with the rasp too.

ART's just add back some of the power and torque you lose with other test pipes.

ive heard resonated test pipes, ive heard ART pipes and ive heard diff HFC's.

the ART pipes def do the best of them all in terms of limited the sound

No. I have seen data that they make 2-4 more whp than regular test pipes, resonated or otherwise. That's about it tho'.

They probably just flow a little better due to the unique resonator design -- other than that, you can't flow much more freely than an open pipe.

They also improve the torque curve quite a bit.

What do you mean, no, and then agree with me?

Also, the loss with test pipes isn't at the top end, it's at the low end, this is where the ART's correct the problem, and as said above, it bumps the torque nicely, between 15-20 ft/lbs in some cases.

proof on this 20ft/lb gain over tp's?

I will say i've not seen Dyno's of the 370, so that's from the 350.

I do not have them to hand, but if you do a search (sorry i don't have time to do it right now) then you will see independent dyno's including delta graphs (the good ones showing the difference)
Best place is probably g35driver or my350z for the time being.

Indeed. Plenty of dynos have shown fantastic low-end TQ gains on VQs with ART Pipes.

Thanks guys **** that was alot of help. gonna try them out for a while and see if i can get use to the sound. if not then will see what i do. Peace

I mean there is no loss of power associated with running an open pipe. The few extra ponies from the ART pipes are probably due to the specific harmonics of the design. Which, to be fair, is impressive.

But it's not as if the gains are massive as compared to ebay pipes...

They make a few more whp/wtq than regular test pipes -- that's it.

For example:

http://www.the370z.com/members/jordo...ferent-tps.jpg

Yes, with tuning, some more power might have been picked up, but the differences will still be relatively small.

They're nice pipes; they sound nice and score you more power than regular TP's, but let's not get crazy here.

No one should be losing any power anywhere provided the pipes are the right diameter. I've seen zero evidence of this. Explain to me why this would happen.

Do mean that blip at like 2000 RPM? That's as likely to be wheelspin as the dyno started recording as not. From 2.5K on it looks about the same or shows gains, probably helped most with a tune.

That's not a very accurate dyno or comparison, then. It doesn't seem to be back-to-back, one run is tuned, one isn't. There was possibly some wheelspin on the dyno, as well? Too many variables.

Here is a dyno on a 350Z VQ35DE. No tunes on either of the runs. Both done back-to-back. These were the gains Tony people would see and in that range, and we did. I've seen similar dynos on VQ35HRs, as well.

http://img693.imageshack.us/img693/6...erartpipes.png

Here it is on an HR motor. Notice the torque gains? Lower run was HKS Exhaust + HFC + Tune. Higher run is MD Exhaust + ART Pipes + Tune.

http://i55.photobucket.com/albums/g1...g?t=1284969044

So here's the delta test of test pipes Vs ART pipes, this is a torque sheet.

http://i352.photobucket.com/albums/r...EARTTorque.gif



And here's the same for horsepower, again, against test pipes.

http://i352.photobucket.com/albums/r...DEARTPower.gif

Wow almost 16whp difference between exhaust and test pipes. That's really good.

^^^ Okay, but different motor and looks like a few of those are not independent...

Anyway, I'm a "bang-for-the-buck" kind of guy, so I always offer my humble recommendations based on that.

whp:$, you can't beat plain test pipes; next up would be resonated; last would be ART. Yes, you have to pay to play, but how much is each extra whp/wtq worth?

Nothing against the Motordyne pipes -- they are very, very nice, but they are, IMHO, too expensive for what they can do for a 370.

but then its not just about whp.

lets be honest.. people tend to cry about 1 - 2 whp when really its not all that big of a deal for most most most most drivers.. and then especially how they drive. Its just bragging BS.

but, now what the ART pipes do for sound, which is what this thread was initially about, nothing beats them. So if you take the hp/tq and the sound factors in.. they are worth it, considering the price of some of the better resonated TP's.

Yup, what daisuke said, it's about the sound, it's not having rasp, or so much extra volume etc.

No argument, they're expensive, but they're incredibly well built and do what they say on the label.
There are tons of independent dyno's, on my older DE motor, on the HR etc as well as 370's.

What about Berk Technology High Flow Catalytic Converters are they as good as the HFC or motordyne ART pipes.

Berk HFC's are just good quality HFC's.

MD ART pipes are custom test pipes, the cut out the rasp and low end power/torque loss otherwise associated with standard test pipes.