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Judge

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  1. For anyone interested, these are made from 201 stainless steel, the resonator has no additional sound absorption material and is primarily intended to reduce drone rather than rasp, expected power gains are minimal.
  2. I'm currently considering one of these but am having trouble finding much information other than a few Youtube clips. Has anyone got any experience with them? They're clearly a copy of the Motordyne XYZ but how do they compare (power gains, sound, quality, fitment, etc)? Cost is about £390 (including shipping, duty and VAT) which is considerably cheaper than the XYZ... Thanks.
  3. Paul said the dashed line is the pre-tuning run...
  4. Hi Mark Seeing as TDI North offers UpRev remapping in association with you, what's your opinion on the figures?
  5. For the 6 speed manual 5th gear is the 1:1 ratio. I agree the Powerflow is possibly not the best CBE on the planet, but I doubt it has lost me the power and torque that the ART pipes gained me. So the results are either over-reading WHP or under-reading BHP. But either way they're probably not very accurate.
  6. You're right. I guess he didn't fancy doing ~160mph. If that was the case he should have asked me to drive it!
  7. I asked about that as well and he said he didn't like doing runs in 5th because of the speed...
  8. 18 minutes between runs 3 and 4, not 1 and 4. But it was still only about 1 1/2 hours total and I got charged for 3 hours which I'm not especially happy about.
  9. I don't know much about dynos so I'll take your word for it.
  10. It's 313 PS, which is 308 bhp. But I used the figures 306 bhp and 268 lbft as they're the ones most often used on various websites. If you still have a stock cat back exhaust then those figures sound about right to me. But as you say, all dynos vary.
  11. The HR has 306 bhp and 268 lbft stock. So assuming that dyno is accurate, those can't be flywheel figures because it would mean the modifications gained me 5 bhp and LOST 18 lbft. I've test driven several HRs with similar mileage and maintenance and mine is considerably quicker. So I'd say those are wheel figures but might be a bit optimistic. I have no idea about the weird peaks and troughs at the top end. It certainly doesn't drive like that! I just assumed it was a glitch with the dyno system so didn't ask the tuner. What I did ask was why the tuned peak figures were only 3 bhp and 4 lbft higher than pre-tuned. He said the gains were “subtle”. For £450 I'd say “disappointing” is a better description. But I did get some bottom end and mid range gains, the removal of the throttle response delay in the first three gears, and the slightly rich AFR was corrected. EDIT - Looking at this again, what also doesn't make sense is the speed shown at peak power. If it was 4th gear, how could it be 117mph at those revs? I have a stock final drive so the speed should have been ~127mph. Maybe it was a typo...
  12. 2008 350Z VQ35HR (34500 miles, FSH) Motordyne ART Pipes, Powerflow CBE, HKS Super Hybrid Panel Filters, UpRev Unknown Dyno @ TDI North 311 whp 250 ftlb
  13. Looking at various exhaust manufacturer's websites, the part number is the same for the 350Z and 370Z Y-pipe (ISR is an exception because it uses 2.75” primaries for the 370Z). Does anyone know if the Motordyne XYZ with resonator module is also interchangeable between the 350Z and 370Z? I've looked on the Motordyne website but it's not clear. I've also looked on various trader's websites and on some the part numbers are the same, on others they're different. Does anyone have any information regarding power / torque gains, preferably with dyno charts? I can't find any information on the Motordyne website and the only other information I've been able to find is shown below. There are other threads on various forums but they're so old the images of the dyno charts are no longer there. XYZ Gains 1 XYZ Gains 2 Thanks.
  14. I've got a really irritating tinny resonance coming from my exhaust (back of the car, not underneath). It starts at around 2500 rpm WOT and continues all the way to the red line. It's not really noticeable part throttle and does it briefly when revving WOT in neutral as the revs pass through 2500 - 3000 rpm. Initially it sounds like there's an angry rattlesnake in my back box, but at higher revs it almost sounds like there's a circular saw strapped to the back of the car. Here's a link to a short clip of it. https://youtu.be/jDQ4JZ3nyG0 My car is a 2008 350Z and current exhaust setup is stock headers, Motordyne ART pipes, Powerflow Y-pipe (leftover from CBE fitted by previous owner), Fujitsubo Legalis R mid section and back box. This all started after installing the ART pipes. I'm assuming they're not what's making the noise, but are a contributing factor because of the increased exhaust gas flow and decreased muffling compared to stock cats. I don't think it's the Fujitsubo (even though the tailpipes are a bit tinny sounding if you flick them) because the previous Powerflow mid section and back box made the same noise. And I don't think it's the rear heat shield as they tend to produce a lower pitched buzz (I had a cat heat shield issue when I installed the ART pipes so am assuming the noise would be similar). As the headers are stock, that only leaves the Powerflow Y-pipe. Their current Y-pipe has been redesigned slightly, but the one on my car is similar to the Scorpion. There's a slight bore mismatch as the ART pipes outlets are 2.5” ID and the Y-pipe inlets are slightly less than that (2.5” OD, haven't been able to measure the ID). There's also a mismatch between the Y-pipe outlet (2.5" OD) and the Fujitsubo inlet (3" ID) which might not be helping the harmonics. So would replacing the Powerflow Y-pipe with a better designed Y-pipe (that also matches the bore of the ART pipes and mid section) solve the problem? Or am I barking up the wrong tree?! Thanks.

350z-uk.com

370z-uk.com

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