First mod: PPE Headers... +35WHP
 

I've had these headers laying around for quite a while, and finally got a chance to get them installed and on the dyno.

I bought them second hand from another forum member. PPE headers are normally mild steel, but these were special ordered as stainless and ceramic coated. Then I had them wrapped with DEI Titanium wrap.
Pic of the headers after wrapping and before install(linked for hugeness) :yum:

Before and after dyno chart
Before: Stock
After: PPE Headers + UpRev tune
RunFile_005.drf: 86.47 °F 28.68 in-Hg Humidity: 46 % STD: 1.07
RunFile_019.drf: 68.51 °F 29.16 in-Hg Humidity: 30 % STD: 1.03
Final pulls done in 5th gear. These things showed decent gains across the board with peak gain of about 35WHP!!!





The pull in the vid was just in 3rd gear for tuning purposes.

As far as sound, I usually don't care too much about that sort of thing as long as it's not obnoxiously loud. I did notice a bit of rasp on cold starts, but seems to get better as the engine warms up. Standing oustide of the car during a pull, it was not too terribly loud, quieter than I expected actually. Of course I still have stock catback in place.

Before getting it on the dyno I was hoping for +20HP or so, though in the back of my head I thought maybe that was a bit optimistic. Needless to say these headers have far exceeded my expectations. The quality of fabrication and engineering that went into these headers is top notch, and I would recommend them to anyone else looking for the best for their car. Props to PPE for an awesome product. :driving:

35whp.... hmm...... sounds too good to be true...

I agree... ^

Heh, I figured people would be skeptical. I will say one caveat, that the "after" dyno was done in cooler weather which may have affected the results some, though the dyno software should have corrected for that somewhat. Even with that in mind, it's still quite clear gains.

You don't have to believe it though, doesn't affect me the slightest. Either way I'll be having a blast driving my car. :tiphat:

Run numbers tell you all you need to know

How big of a difference in temp?

Don't dynojets read higher anyways...? :confused:

im actualy not surprise with the gain ,
remember the OEM header arent that good with a very bad collector
also remember the OEM cats are very restrictive , people are easily getting 15whp just with test pipe
then next he got an Uprev tune that can maximise his gain by atleast 5-15whp ...


so no im not surprise with that but the dynojet seem to read quite high for a a stock baseline. gaing is gain anyway !

35whp does sound pretty nice, I've been seeing that LTH do make a lot more power. You did get them coated and wrapped so it drops intake temps too, that may be part of the reason for such high gains.

With an exhaust I could believe it more.. however I would imagine most of the gains are getting choked up when entering the CBE

Yes & no, a bit might be, but he also had the car tuned with the headers which will help a bit.
A lot of variables here, his car from factory could be a slug and a tune could opened it a lot and throw in the headers and you see great gains. Honestly, based on seeing a lot of 20+whp from first mods on this forum, I could see this LTH+tune combo netting 30whp since he went from stock.

RunFile_005.drf: 86.47 °F 28.68 in-Hg Humidity: 46 % STD: 1.07 Average Gear Ratio: N/A
RunFile_019.drf: 68.51 °F 29.16 in-Hg Humidity: 30 % STD: 1.03 Average Gear Ratio: N/A
STD corrected

Edited first post to include info.

Also in case anyone thinks the baseline is high as well, I attribute that to my manual tranny which are a bit more efficient than automatic, and non-sport package, which means less rotational mass from wheels/tires/brakes. Oh and I followed the Nissan recommended breakin procedure to a T. :stirthepot:

there is a small advange with those header for the top end , they are step headers not like the FI headers which will give a broader range in power but lower in the top end to compare with the PPE

you definatly see it on his dyno sheet

you should up your rev limiter, I made peak power at 7800rpm with my PPE's, car just keeps pulling with these headers.

As long as you are happy with the results who cares..... I gained 22whp just from exhaust and Test pipes, So I could see adding longtubes with a tune and getting 30+....







DAN

well, for what it's worth, my baseline on a superflo dyno was 296 whp. With F.I. LTHs AND F.I. CBE, untuned, no other mods, I dynoed 326 whp on the same dyno. So +30 whp untuned. Still need to go back and redyno again since I've added some stuff, but I suppose +35 whp is possible although i would have expected that with a CBE as well.

Interesting... don't most 100% stock Z's dyno around 270-ish to the wheels?

Dyno can read anything you want it to say, it is a tuning tool and used to see progress with a grain of salt.

Yep, which is why people that want meaningful numbers talk deltas in percentage points rather than hp, and do runs back to back.

your such a killjoy.

*you're














:roflpuke2::bowrofl::roflpuke2::bowrofl:

ah, I should have caught that, dammit.

:tup:

:mad:

:stirthepot:

:yum:

y'all are funny :icon17:

I know. :icon17:

stop it.

(you're turning me on)

35whp not just from the LTH but uprev also. that can easily be done with a proper tune. i picked up 31whp from my tune alone.

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.