Got my Crawford headers installed at GTM on Wednesday, and then had my car retuned by Shawn at Church Automotive. Once again they both did an awesome job, and I was very impressed with GTMs customer service. Go Nick!

It wasnt the best conditions. It was 90 degrees on Wednesday up in Long Beach, my previous dyno about a month ago before I had the headers was 74 degrees. Humidity was 6% on Wednesday, versus 43% on the previous dyno day.

All pulls were done in 4th gear on a dynapack. I will post the graphs tomarrow, unfortunitly I forgot the sheet at work. All my other mods are in my sig.

My best baseline before headers was 282hp and 257tq. My best pull with the headers and tune, was 291hp and 271tq. So 9hp and 14tq at peak. I gained a whoping 20 lowend torque though! The hp gain is through out the entire powerband, never dips lower.

This is about 274hp and 255tq on a dynojet.

The numbers before the tune were about the same as before. 282hp and about 251tq. So about the same hp, but lower torque. The car was runing a full point leaner though. And it was a lot hotter. We estimate the headers actually added about 5hp before tune under the same conditions. When we added fuel the torque jumped up a **** load(like 20+tq at peak), but the top end hp didnt respond that much, maybe about 3hp. It wasnt tell we were able to get the intake temps somewhat close to the previous dyno run, did we see the hp climb a little bit more. Cam timing seemed to have no affect. All the other things which could be tuned, had already been done the previous time.

We had to get a fan blowing straight into the intake to get the intake temps even close to my other dyno pull before headers. We were able to get the intake temps down to 38 degrees celsius, the run that it is compared to before headers was 35 degrees celisus. We had no fan blowing into the intake then. So theres still 3 degrees celsius difference. Obviously we couldnt do anything about the humidity though. We figure under the same conditions I would see another 3-5hp and tq. I want to go back there and try to re dyno and get higher numbers, cause I'm 3-4 hp within his highest ever NA Z.


Once again, i'll have the graphs tomarrow.

 

See, that's why someone needs to my my frickin headers from me. They work!

Congrats, gotta respect the guys who wanna build NA Z's.

 

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Yah, they are. Mine aren't though.

 

oops i read that wrong.

btw the car sounds mean as ****!!!

 

I bet it does. When I had my Z, I had your exhaust with stock headers and cats and that alone sounded great. As soon as I put TP's on it, it all went downhill.

 

I was thinking about putting the UTR resonated test pipes on. I wonder how that would sound.

 

congrats, those numbers are impressive! was there a noticable difference when you added the throttle body spacer?

 

Those are some great numbers! You are right, you definitely need a tune to get the full potential from headers.

 

numbers sounds a bit high to me, but crawford headers are the shat. good stuff dude!!!

 

What tuning software was used?

 

I really like Shawn's dyno capability of comparing old results with new results.

Thank you, as I've never seen any conclusive evidence that the crawford headers do anything

 

It's personal preference, but I hated it. Absolute rice, even resonated.

 

Good gains from the same dyno that is what counts! But go back to GTM and get some real numbers, EVERYBODY and their grandma knows that Church Automotive reads wayyy high, its where the Honda guys go to eclipse the 300whp mark NA LOL

 

The throttle body spacer didnt add any hp on the dyno for me, I installed it cause 3 people right before me saw 5+hp gains from the TB spacer(all revup motors with the Popcharger I didnt have anything.). It was only 87 bucks, and most people were seeing good gains from it, so I said what the heck. Unfortunitly I wasnt as lucky as everyone else.

Maybe I did get gains from it after being tuned though. My car hasnt responded well to any mods before a tune. The Plenium spacer gave me, 5hp. Exhaust, HFCs, and popcharger gave me 3hp, but gave losses everywhere else in the powerband. I got all my gains from being tuned. The only way to tell, would be to take off the TB spacer now that I'm tuned, and see if my numbers go down.

 

A dynapack reads 5-6% higher then a dynojet. My projected dynojet numbers are 274whp and 255tq.

 

Yeah it reads OMFG high ... that's for sure... don't take the numbers at base value

 

nice numbers, make's me consider a tune. Good work.

 

Tune = Yes Headers = No That's a pretty heavy $/HP ratio.

 

True. But the headers allowed for tuning to take place. The Crawford headers leaned out my car by 1 full pt. I was already tuned before I got my headers installed.

But once again my car hasnt responded to one mod well before a tune. Like I said I only got 3hp out of the HKS exhaust, HFCs, and intake, before tune. This is really rare, and most people see much better gains then this before tune. If you think about it like that, the headers did more then all three of those mods put together.

Every car is different. Nissans released a bunch of different versions of the ECU for each year of the Z, and as such every car will respond differently to the mods.

Most people will see much more then 5hp before a tune off of the Crawford headers.

It may be the fact I dynoed my car so shortly after installing my new parts(both times). A lot of people say an ECU needs multiple starts and miles driven before it will react to the changes. Maybe I just didnt give my stock ECU time to react and change to all the new air flow.