Great number no matter the dyne it's on! He has a before and after so the gains are real!

Op your buddy 512Z with the HR is doing the same here shortly correct? I'm hoping he doesn't run into any dormant issues!

Yeah he's gonna be first to try those headers on HR I think. Not sure when he's planning on doing the install.

Two things, your correction factor for a more realistic WHP should be SAE, not Standard. Also, why is the STD correction factor changing between runs? Just curious.

Correction factor is calculated based on atmospheric conditions... that's the whole point. The before/after dyno were done on different days, hence different temps/humidity/pressure.

I have the run files, I can post up SAE corrected version if it makes you feel better. Probably will have to wait till monday though.

Not sure why everyone is acting like it's impossible to make good gains on this car and that this is all somehow some big conspiracy, but whatever.

It is less because people think it is impossible, and more because the two runs don't really share much correlation. Run time on different days means a huge potential variability that isn't accounted for.

As it sits, you picked up ~10PP with a tune and headers, on a pair of runs with vastly different weather conditions. Certainly not an unbelievable gain, but one that really doesn't mean much unless the runs are done back-to-back. Correction variance due to weather could easily account for +/- 8-15PP

Bingo. Yes, good gains, but you really need back to back to see what the car is actually gaining. If you notice, the first dyno pull is usually 7-8 hp lower than the last pull because the car's mapping changes a bit after a few pulls and makes more power. You can see this pretty much with any 370z on a dyno.

We know you arent trying to go crazy with numbers, just talking about accuracy. If you start with your first pull on a warm day at 275hp, add that as your first dyno line, and then add and full exhaust and record the third pull on a later day which is 30 degrees cooler with less humidity, you might show 295whp to 305whp, but part of that gain is going to be due to the atmospheric condition differences and part due to the mods and the mapping, so you dont really know exactly how much your exhaust gave you although its definitely making more power.

Just trying to help ya. Also, yes SAE and STD are just correction factor differences, neither is "the" number to use, but most people use SAE as the most realistic number. STD tends to inflate numbers a bit more and is more popular with people for that reason.

Either way, nice numbers and I'm sure you enjoy the headers!

Here's the SAE version of the same runs.
RunFile_019.drf: 68.51 °F 29.16 in-Hg Humidity: 30 % SAE: 1.00 Average Gear Ratio: N/A
RunFile_005.drf: 86.47 °F 28.68 in-Hg Humidity: 46 % SAE: 1.06 Average Gear Ratio: N/A

http://i.imgur.com/5XhaN.png

Darn I only made 32WHP... :rolleyes:

Any idea why there are those big dips down low? I'd be asking my tuner about it. Good numbers though!

Looking at the AFR curve below his TQ/HP curve and you see that those two dips low in the RPM range correlate to the car first running rich then overcompensating and leaning out before stabilizing at a nice consistent ~12.7 for the rest of the rev range. Most likely a little more tuning would straighten this out.

Interesting to note that this header seems to only really make a difference above ~6500rpm or so. I would bet that the rest of the gains come primarily from leaning out the excessively rich stock mixture. AFRs of 11.8-12 would be great....if the car was turbo charged. Granted, I'm brand new to 370Z's and the VQ engines, but when tuning L series engines in older Z's, ~13-13.5 usually returns the best gains on NA cars. For my turbo L28ET i shoot for AFR's of about 12.5 for low boost and 12 or so for higher boost and higher up in the rev range.

Are all 370Z coming out of the factory with WOT AFRs around 12? If so my first investment is definitely a decent tune to lean that out.

I don't know if any of you guys know but this PPE header was also used in one of the first STS turbo 370z.

I would LOVE to hear the STS turbo equipped 370z with the longtubes, anybody got clips of that setup?

Youtube sts 370z and look for the red 370z nismo. It sounds like shiet if you ask me. From the looks of it the nismo was able to hit max boost faster with the headers according to different dyno charts I have seen.

Honestly though, these headers seem promising for both forced induction and n/a application. Plus this compared to the fast intentions long tube headers they both seem about the same to me for results wise. I mean sure one might produce 2-3 more whp than the other but that can be negligible with just better driving. If anything I would buy this over the fast intentions because PPE's lth are equal length. Not sure if F.I. makes theirs in equal length. Plus PPE's headers are like 500 dollars cheaper.

I can definitely vouch for these headers making over 30hp with a tune. I gained 30 hp from the PPE headers, Motordyne Y pipe and cat, and a Tanabe exhaust without a tune. That was with my CEL still on and immediately after install.

Yep those Charlotte boys know how to get it done. Btw glockwork im headed back shortly cause I just installed my FI cat back!!