Hi-Flow Cats vs. Resonated Cat Pipes

ronn1

ART test pipes now have version 2 which have brackets and added ceramic coating. These are prolly the best test pipes money can buy. NO CELS..great resonated sound and now the bracket to minimize vibration.

PIC..Version1 below 2 above:

Footloose301

Haha actually there was like 3 versions before those too. The first version had a flat resonator, then they made them rounded for midrange power, then start polishing them but beads landed up inside the resonator. Then they made ceramic titanium coated (that's what I have), then they began the polished ones again, and now they finally have tabs on them and they removed the steel wool. Haha these will undoubtably change again.

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2010 40th Anniversary 370Z

Pelican170

I have the Fast Intention HFC's and i do not believe any brackets were needed. A shop did the install so i could be wrong but dont think so...

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Fast Intentions CF Exhaust - Fast Intentions HFC's - HPS Tubes w/ AFE Dry Flow Filter's

Pelican170

Also,

how do Advanced resonated test pipes differ from test pipes to get better gains?? I thought test pipes were basically just straight thru pipes, how does it get better than that?

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Fast Intentions CF Exhaust - Fast Intentions HFC's - HPS Tubes w/ AFE Dry Flow Filter's

Footloose301

Advanced Resonance Tuning (ART pipes) - MY350Z.COM Forums


It's called a Helmholtz resonator. google it.

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2010 40th Anniversary 370Z

Pelican170

Thats intersting but I would like to see some actual dyno results to show the differences... Sorry, im a skeptical person lol

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Fast Intentions CF Exhaust - Fast Intentions HFC's - HPS Tubes w/ AFE Dry Flow Filter's

bigsix

Thank you guys for all the great info.

-from another uneducated in tuning japanese

ronn1

Scroll down to charts on this link..compares ART to test pipes:

Motordyne ART Pipes (TEST Pipes w/ a twisty twist) : G35 and G37 General Discussions

Footloose301

There are many different dyno comparisons

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2010 40th Anniversary 370Z

Pelican170

Hmmnn, Im just not seeing it. None of which have been dyno's comparing test pipes, only the ART's to HFC's.... and whats on that link is not a dyno test, it is a chart...

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Fast Intentions CF Exhaust - Fast Intentions HFC's - HPS Tubes w/ AFE Dry Flow Filter's

SS_Firehawk

I'm just going to bump this up after a year of hibernation. Footloose is absolutely wrong regarding ART Pipe with an aftermarket shorty header vs LTH's. Longer primaries improve scavenging and merge the exhaust together in pulses. Longer primaries generally improve torque over shorter ones. 1 3/4" diameter tubing generally improves torque over 1 7/8ths" Stepped headers use a combination of the two different sizes to improve low end torque and keep top end power. A tuned header means tuning the length of the primaries to the powerband of the engine. LTH's improve scavenging and assists in pulling old exhaust gasses out of the combustion chamber. The higher the rpm, the less critical this is, but is VERY important for making power and torque down low and below 4k rpm. Both the PPE LTH's and the F.I LTH exit at 2.5" and has the benefit of not being restricted to 2 1/4" when connecting to the stock header.

Shorty headers attempt to do the same in a smaller package. Primary length is limited, they will not be stepped, and can only improve flow to a certain degree. Attaching an ART pipe will improve performance... over the stock cats or maybe a standard test pipe, but it's still just a pipe that can't possibly do the same job as having LTH's doing. The only shorty/test pipe combo that came close to LTH's were the momentum headers and TP. But there is no direct comparison as gains made included VVEL tuning.

Even with superchargers, they flow so much better, boost pressure is reduced, measuring at the same boost pressure, the SC with the LTH's will always make more power, as it's now running more efficient per psi.

The only issue with headers is the PITA install and costs. If you plan on going turbo, save your money and don't buy them.

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Footloose301

I said it was just my theory, so chill.

LTH's definitely have the potential due to equal length and the exhaust pulses, no doubt. However, it's been proven that shortys dyno around 1-2whp, therefore not cost effective and LTH's are even more expensive. Not worth the money (in my opinion).

I see you have LTH's and dyno at 310whp on a dyno jet, whereas I dyno at 319.5whp on dyno dynamics, and 298whp on the mustang dyno.....

We need actual dyno comparisons on the same dyno if anybody has some out there.

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2010 40th Anniversary 370Z

SS_Firehawk

It's plenty cold outside Cost effectiveness, yes, not very cost effective, but you can find good deals on em. Hard to compare two different vehicles on two dyno's. The delta between my baseline STD and my current dyno using STD is roughly 50whp.
The headers and exhaust were good for 30 of that. No gains on tuning currently

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Footloose301

Whenever NewYorkJon34 parts his car I will do a dyno comparison if he parts with his LTH's for a decent price. I will do before and after at HP Logic for everyone. I know he's been searching for a 2013/2014 GT500 he should part out sometime soon.

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2010 40th Anniversary 370Z