roneski,
Your're posts on the fuji contributed to my decision. Thank You! Get the headers! They make a huge difference. The engine is much smoother as your're shifting through the gears under hard acceleration. It changes the whole feel of the car.

 

I'm also interested in getting a header. but which one should I get? the price range varies alot. crawford is $1000 and DC header i think is only $500. why is the price different alot?
by the way, which one is better, the ceramic one or the steinlessteel?

 

The reason their are such differances in price among header offerings doesn't have anything to do with what we might think. Making a little power in a tiny blip on the dyno plot is pretty simple. To make good power in the entire rev range take's a lot of R&D time and a more difficult construction process. These are things you do not find in lessor header offerings. Things like what tubing diameters are used (Nismo's use a stepped design), tubing lengths, and collector design. The 2 best header design's for the FM platform pull these things off, but the result is higher design and construction costs. This is why the Crawford headers are known to be the best and also cost the most. Next up would be the Nismo headers. Their is a company that does make a copy of the Nismo for a lower cost $650 in mild steel and $795 in stainless http://www.brmusa.com/headers.htm

 

It's funny everyone says headers help out a lot because months back SCC magazine tested three 350Zs, one was stock, one had a CAI and after y-pipe exhaust, and the other had the CAI, exhaust including NISMO headers, and NISMO cams. When it came down to it, the dynos showed very little increase in power and the fully modded 350Z was only fractionally quicker than the stock 350Z. I have yet to see a before and after dyno of any G with headers.

 

http://www.my350z.com/forum/showthre...mo+header+dyno


"Nismo header independent dyno...u will be surprised"


daytona350z
Daytona Blue Comin Thru!!


huntington beach.orange county

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hey guys, i was just able to dyno my headers. my results were very good.

run 002-my base was 237.7hp and 230.9tq

run 3(1) was 249.2hp and 246tq

run 4(2) was negated cuz it was a mistake of 4th gear..still, 246.6 and 243.4tq though

run 5(3) was 249.3 and 249.4 tq.

peak gain of 11.6hp and 18.5lbs of tq

edit: conditions were about the same, being in favor of the baseline dyno... thursday was about 66* and stock dyno was 62* and on the first run, the fan turned off midway through the pull.

would post a bigger pic to see more clear, but had to resize it for forum purposes..would need a host to load larger file

btw..look at the fat torque gain all throughout the rpm band, especially at 4k




http://www.ssheaders.com/header.htm

http://www.burnsstainless.com/TechAr...ry/theory.html

 

so what is the difference between mild steel header, steel header, ceramic header and stainless steel header?
which one is the best?

 

Those Dyno Plot lines match the lines on my grinning mug while I'm driving my header equipted G

 

Gsedan35-

Good post. Shortly after I posted, I searched my350Z.com and saw the same thing. What's sad is that seems to be the ONLY legitiment header dyno on that whole site.

In the May 04 issue of Sport Compact car, they tested a stock 350Z Track, an S-Tune 350Z (Nismo catback), and then the R-Tune 350Z (Nismo headers, Nismo cams, Nismo CAI, Nismo catback, Nismo clutch, Nismo lightened flywheel).

Track
239whp/237wtq 14.2@98.5mph

S-Tune
243whp/238wtq 14.1@98.4mph

R-Tune
249whp/242wtq <----oddly close to the dyno graph you posted above. They're almost exact. 14.1@99.3mph

All cars ran 18" rims.

 

Details and where is the plot? Never seen a Dc Sport header dyno or any of the copies that actually amount to anything more short gain in the mid range and a gain in the last 800 rpm's.

 

I have that SCC issue, they felt that the reason they did not test gains is because the ECU conspired to not allow them because they were using 91 octane gas vs 93. Jeff's car at performance nissan has those mods and he's dynoed well above oem.

 

Yep, even their project Z when stock gained 8-10whp across the whole rpm band by simply running 100 octane vs 91 octane. I'm surprised more people don't take advantage of this on the dyno and at the track.