Northstar 180* headers.

The Dark Side of Will · Mon Aug 03, 2009 2:20 pm

What I'm trying to get across to Aaron is that no, a design with slightly different primary lengths isn't absolutely optimal, but it's so little different than optimal that the difference doesn't matter. Atilla's example of 5 HP on 800 is a difference that only matters in Pro-Stock and F1.

Yes, the VE curve of cylinders with different length primaries will be different, thereby rendering the engine untunable... well, sort of. The long tube cylinder will pull more air and need more fuel at low RPM than the short tube cylinder, and vice versa at high RPM. However, if the difference between the ideal AFR's for the two cylinders at any given RPM point is only .1 or even .05, then the difference is irrelevant. AFR can barely be measured that accurately. The difference is down in the noise, as Atilla's dyno results show. It's probably a good day on the dyno when the difference between two runs with the *SAME* configuration is less than 5 HP on 800.

The burden of proof is on Aaron to SHOW (IE, demonstrate via calculation of the required AFR's or dyno results) that a 3" range for primary lengths is unacceptable.

Aaron · Post by **Aaron** » Sun Oct 04, 2009 7:54 pm

Sorry for the pics, they are cell phone pics. You should get the idea though.

Atilla the Fun · Post by **Atilla the Fun** » Mon Oct 05, 2009 12:11 pm

Will there be cats?

Aaron · Post by **Aaron** » Mon Oct 05, 2009 7:26 pm

If I have room for them, yes, but at this point, it isn't looking like it. I want them, just can't fit them.

Atilla the Fun · Post by **Atilla the Fun** » Thu Oct 08, 2009 10:39 am

Heavy, yes, sort of, if compared to unequal length shorty headers. But breaking? I think not.

TheFieroBoy · Post by **TheFieroBoy** » Thu Oct 08, 2009 1:32 pm

I don't know... Lowlux can break just about anything.

BTW, those headers look nice. I hope you post a video of the engine running.

Aaron · Post by **Aaron** » Thu Oct 08, 2009 7:26 pm

Atilla the Fun wrote:Heavy, yes, sort of, if compared to unequal length shorty headers. But breaking? I think not.

Heavy compared to a log style? Yah. Heavy compared to stock? No.

And no, they won't break.

TheFieroBoy wrote:I don't know... Lowlux can break just about anything.

BTW, those headers look nice. I hope you post a video of the engine running.

Very true I have no doubt he would find a way.

Thanks, and I absolutely will!

crzyone · Post by **crzyone** » Thu Oct 15, 2009 5:34 pm

Wow, nice work man! I have not been in this section for a while.

Please get some sound clips as soon as it's running.

Atilla the Fun · Post by **Atilla the Fun** » Fri Oct 16, 2009 1:36 pm

crzyone wrote:Wow, nice work man! I have not been in this section for a while.

Please get some sound clips as soon as it's running.

Damn. I make time for every section every day (except sundays, because I have no net access)

Aaron · Post by **Aaron** » Sat Dec 05, 2009 10:52 am

It runs!

My friend started it up for the first time a couple days ago. It still needs a lot of work, and has a long way to go, but it's getting there, somehow.

http://www.facebook.com/video/video.php?v=532521012191

TheFieroBoy · Post by **TheFieroBoy** » Sat Dec 05, 2009 12:45 pm

You have to register with Facebook to see the video.

Aaron · Post by **Aaron** » Sat Dec 05, 2009 12:56 pm

I was afraid of that, I'll re-host it...

CincinnatiFiero · Post by **CincinnatiFiero** » Sat Dec 05, 2009 2:39 pm

You need higher quality video from in the car when its moving and some mufflers. My 3800 with open headers sounded pretty much the same in my garage.

Atilla the Fun · Post by **Atilla the Fun** » Sat Dec 05, 2009 2:59 pm

In a way, it's impressive, but in a way, it's shameful. Caddys are supposed to be eloquent. 32 valve V8s are supposed to be smooth. That sounds more like a dirt-track 350 Chevy than a modern Cobra or a BMW or a Ferrari. Still, it's good that it's running. On with the tuning.

Aaron · Post by **Aaron** » Sat Dec 05, 2009 3:05 pm

CincinnatiFiero wrote:You need higher quality video from in the car when its moving and some mufflers. My 3800 with open headers sounded pretty much the same in my garage.

Working on that part

Atilla the Fun wrote:In a way, it's impressive, but in a way, it's shameful. Caddys are supposed to be eloquent. 32 valve V8s are supposed to be smooth. That sounds more like a dirt-track 350 Chevy than a modern Cobra or a BMW or a Ferrari. Still, it's good that it's running. On with the tuning.

Working on that part too

Atilla the Fun · Post by **Atilla the Fun** » Sat Dec 05, 2009 3:30 pm

It's gonna be funny the day some dumbass asks something about what engine you adapted an LSx intake onto. I'd love to be there.

Aaron · Post by **Aaron** » Sat Dec 05, 2009 3:32 pm

Tell me about it. That and "What engine is that, my buddy put a 350 in his it's fast."

Here's the streetfire video:

http://videos.streetfire.net/video/Fier ... 723761.htm

TheFieroBoy · Post by **TheFieroBoy** » Sun Dec 06, 2009 1:41 pm

Atilla the Fun wrote:In a way, it's impressive, but in a way, it's shameful. Caddys are supposed to be eloquent. 32 valve V8s are supposed to be smooth. That sounds more like a dirt-track 350 Chevy than a modern Cobra or a BMW or a Ferrari. Still, it's good that it's running. On with the tuning.

No engine with an open exhaust is going to sound eloquent... not even a "silky smooth" V12.

The Dark Side of Will · Mon Dec 07, 2009 3:41 am

Haha... Listened to F1 cars? It can be done, but the headers and collectors have to be tuned to the 9's.

Real Fiero Tech

Northstar 180* headers.

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