Has anybody ever dynoed LTH as their LAST mod as opposed to their 1st or 2nd? We all know that the first mod on our cars will always be the highest, no matter what it is and then it goes down from there.

I'd like to see someone with intake, exhaust, TP/ART/HFCs, and tune dyno their car before installing the LTH. I personally have a feeling, the difference won't be very big at all, especially if you're replacing the ART Pipes for LTH.

The F.I. LTH thread has some a dyno result like that, so does Semtex in his journal.

Heat isn't a problem. Sometimes the EGT can actually be lower on FI because the optimum F/A ratio is typically much lower.

The XYZ outlet is 3.0" diameter and there is no loss at all with the resonator. I wouldn't be surprised if you made more power with the XYZ pipe.

That's a bold statement, care to explain why you think that could happen?

At least on the 350Z, the XYZ pipe has out dynod everything it has been independently dyno tested against. So if it happened on the 370Z it wouldn't exactly be a surprise.

I know i'll be getting the XYZ pipe... I just want to open that exhaust up as much as I can, but I need to be able to change out the ART pipes in case I can't pass emissions...

Tony, do you think the HFC in the XYZ would be enough to pass an emissions test?

I did, but it was with an addition of a flywheel and a tweaking of my tune that got rich for some reason, so its kind of a bad example... but i gained 21 whp but I think a lot came from how rich my car was when it went in there...

It would probably pass the sniffer test but it depends on what your local laws require.

Federal law requires that only stock catalytic converters be used.

How rich was it?

Tony,

How does ART pipes make more gains over other resonated or non test pipes?

I'm curious how rich it was as well... 21 whp with the LTH's and a flywheel? I would have guessed a lot more than that... didn't the Berk HFC's make like 15 whp (granted I don't know if this was independent tested or not) on an otherwise stock car?

Control of acoustic resonances.

Similar to what headers do but achieved in a different manner, resonance Q, frequency and magnitude. There is much more to how it works though.

A lot of unpublished R&D testing on the effects of the ART pipes on 350Z was part of the ART pipe patent application. There is still much more to explore now that VVEL is part of the equation. I can't wait to get hold of exhaust cam control to tune it to the ART pipes. If it is anything like the 350 engine, amazing things can happen on the dyno when the exhaust valves can be tuned to the ART pipes.

Would anyone like to conduct a fair and independent test comparing the ART pipes to Long Tube Headers?

It would make an interesting test for sure.

I have your ART Pipes.. i do not have LTH...

: /

The exhaust cams on VQ37VHR are static. There is nothing to control, no phasing of lift adjustments. Only way to change that would be custom ground camshaft, which no one is producing at the moment as far as I know.

Only intake cams have VVEL and IVT.


http://i.imgur.com/ZT9As.png

Thanks Tony.

Exhaust cam phasing is controllable using Uprev but from what I been told it doesn't make much difference until intake cam phasing (or controlled by VVEL) is tunable unless it helps with your product.
Maybe I should confirm again with my tuner is this is doable and there might be little bit more gains.

Has anyone performed this test?!