custom headers pics

[mark696]

here is some pics off my headers i made to fit in a nissan navara,i hope they work ok.

 

[JBrady]

Nice work, those should make a noticeable improvement in high RPM power. Although my suspicion is you used 1.625" pipes which IMO are too large for maximizing torque. Collector design is also functional but not optimized. Did you dyno the engine in this chassis with the factory manifolds? I would very much like to see before and after dynos whenever possible. If not, that is understandable as it adds time and expense. Bottom line, good work, keep us posted on your results.

 

[mark696]

thanks ,i used 44mm od 2mm exhaust tube,and copyed the lenghts off a set made for a soroar . i haven't had it running yet, so no dyno . i would have used the origanals but they hit my clutch slave , floor pan and lots of other stuff,i'll try and get more pics up as i fit up the rest off the systerm,

 

[Peewee]

You should have done the left bank differently.
The rush imports headers are a bad design as they join chambers 1 and 3, 5 and 7.
You should have chambers 1 and 5, 3 and 7 joined for best flow

 

[mark696]

if i had the room to do that i probably would have ,anyway both sides match ,ands its at the least no worse than standed . what you guys need to do is set up a page on formulas to help people work this stuff out. it would be a great help .

 

[Peewee]

Extractor configuration is worked out by firing order.

Sizes are worked out by JBrady's head

 

[mark696]

but there still must be a rule or guide to go by???

 

[madmont]

but there still must be a rule or guide to go by???

You could try pipemax1 programme NB it is pretty old it runs in dos
http://autos.groups.yahoo.com/group/mc-engine/files/

 

[mark696]

thanks for that , i will give that a shot.

 

[mark696]

peewee are you running your o2 sensors, do you have to , what is best?????

 

[Peewee]

I'm running aftermarket ecu, and not one of the top brands, so the o2 sensor really doesn't do much.
But I still have one in there, as I'm not sure if the ecu used it for cruise trimming.