ArizonaGN Headers

[BobbyBuick]

yep.ive been waiting about 4 now

 

[norbs]

They look good in design, but i still don't like the final pipe diameter being only 2.5" feeding into the turbo on a 4 bolt application. I hope a larger diameter 4 bolt setup is made though?

 

[Nick Micale]

Fact vs. "feel"...

Brent,

I feel the ATR design will flow better in a high HP application. The TA design may spool better. IMO

Having replaced a few ATR sets with our headers, the cars have always performed better with a couple GN's picking up 1/2 a second on their 10 sec. cars.

 

[lazaris]

Having replaced a few ATR sets with our headers, the cars have always performed better with a couple GN's picking up 1/2 a second on their 10 sec. cars.

They picked up a half a sec with no other changes, just a header change from the ATR's??????

 

[DonnieShort]

WOW, maybe that's the reason for my big dyno number My 10.87 was with Houston headers and the dyno pull was with the TA's I'd say Nick might have meant 1-2 tenths of a second. If not I'm staring 10.ohs in the face with a good launch

 

[Ormand]

I'm not a big fan of 300 series stainless steel for high temperature applications- especially 304. I know it will be pretty to start with, but I just don't have confidence that it will last. The coated steel might be my choice, if I hadn't just bought some refurbished stockers.
The 300 series alloys all have high thermal expansion, which can be a problem if not considered in the design. That means that 300 series would probably end up with slightly different configuration than mild steel, to allow for the higher expansion. For high temp applications, the steel fabricators recommend 309 or 314, which have higher chrome content than 304, but still have the high coefficient of thermal expansion.

 

[Nick Micale]

WOW, maybe that's the reason for my big dyno number My 10.87 was with Houston headers and the dyno pull was with the TA's I'd say Nick might have meant 1-2 tenths of a second. If not I'm staring 10.ohs in the face with a good launch

Call Len in Las Vegas with Performance Transmissions. His son's car went from 10.70 to 10.30 when dumping the ATR's and using our headers.

Have a local 10 sec. GN owner who can verify a similar gain as well.

It is also possible the the ATR's are known to be very leak-prone, and this could be part of the gain. What good are performance headers if you cannot get them to seal properly for more than one track visit? :frown:

 

[Lee Thompson]

Nick

How many sets do you have on the shelf?

 

[Nick Micale]

How many sets do you have on the shelf?

Only one set of non-coated mild steel headers and no stainless. The ss kits should be available again in a week or 2.

Will be in Indy at IRP Feb 22 if you want me to bring them! :biggrin:

 

[Lee Thompson]

Ss

I'm holding out for the SS--bring a set of those if they are ready. Better hope this SNOW stops soon.

 

[DonnieShort]

Call Len in Las Vegas with Performance Transmissions. His son's car went from 10.70 to 10.30 when dumping the ATR's and using our headers.

Have a local 10 sec. GN owner who can verify a similar gain as well.

It is also possible the the ATR's are known to be very leak-prone, and this could be part of the gain. What good are performance headers if you cannot get them to seal properly for more than one track visit? :frown:

My Houstons were leaking at the time too, hopefully it'll pick me up too

 

[lazaris]

Call Len in Las Vegas with Performance Transmissions. His son's car went from 10.70 to 10.30 when dumping the ATR's and using our headers.

Have a local 10 sec. GN owner who can verify a similar gain as well.

It is also possible the the ATR's are known to be very leak-prone, and this could be part of the gain. What good are performance headers if you cannot get them to seal properly for more than one track visit? :frown:

LOL

 

[d90dan]

Call Len in Las Vegas with Performance Transmissions. His son's car went from 10.70 to 10.30 when dumping the ATR's and using our headers.

Have a local 10 sec. GN owner who can verify a similar gain as well.

It is also possible the the ATR's are known to be very leak-prone, and this could be part of the gain. What good are performance headers if you cannot get them to seal properly for more than one track visit? :frown:

I just went from ATR's to Nick's headers. The spool is so much quicker! With the ATR's I had to stage with RPM, and I could barely make 15lbs and catch a light. I can now stage at idle and can easily hit 20+lbs before launching.

 

[GNVYUS 1]

I can see maybe a .5 gain due to the poor sealing of the crossover alone, and its possible the guy hooked better and is running more boost.
I can hear it from inside my car sometimes so thats got to be killing spool and top end. Must commend TA for that V clamp, great idea.

Nick, what are the tube dimension on the SS headers?
Not much of a 304 fan due to seeing a few cracked turbo headers, ever consider a set of 321's as another option?

If these Postons every crack these sound like a great replacement.