6 cylinder Tri-Y Pipemax question

[paulzig]

Hey guys, we have an Australian 6 cylinder 265 hemi engine, inline 6...

Has a set of pipe on it currently 2in1, 2in1, 2in1 then these 3 into1... Still managing a 406HP on the dyno..

I feel there may be a bit more in this using a 3in1, 3in1 then 2 into1 conventional system..

Pipemax predicts an overall lenght of around 30" for this particular setup..

Now, can I just use this prediction of 15 inch for the 3 into1 sections using 1 3/4 primary. (including the branching pipe in the overall lenght for the 2ndaries). Then another 15 inch for the 2nd using a 2 inch primary and finally to a collector of 2.5" around 17 inches long...

[MaxRaceSoftware]

Originally Posted by paulzig

Hey guys, we have an Australian 6 cylinder 265 hemi engine, inline 6...

Has a set of pipe on it currently 2in1, 2in1, 2in1 then these 3 into1... Still managing a 406HP on the dyno..

I feel there may be a bit more in this using a 3in1, 3in1 then 2 into1 conventional system..

Pipemax predicts an overall lenght of around 30" for this particular setup..

Now, can I just use this prediction of 15 inch for the 3 into1 sections using 1 3/4 primary. (including the branching pipe in the overall lenght for the 2ndaries). Then another 15 inch for the 2nd using a 2 inch primary and finally to a collector of 2.5" around 17 inches long...

2 things to remember
1- always choose the Dyno RPM/SEC Rate that matches your Dyno Rate
there's only 3 Choices in current version
Zero Rate / Steady-state
300 RPM/SEC
600 RPM/SEC
this version of PipeMax due to backwards compatibilty to older DOS versions,
doesn't remember your choice of Dyno Test Rate,
so each time to Run or Open PipeMax, make sure to choose proper accel rate

2-always play around with VE % Input until PipeMax matches or
correlates as close as possible to your HP and Torque Numbers,
then and only then....Calculate the Header Specs.

Choose "TRI-Y Race Header" option
and it will calculate 3-1-1 Specs

Could you post a screenshot of your Inputs
or email me privately your inputs if you prefer that
and i'll study your specs and make recommendations.

What has been your Dyno results so far using PipeMax's calculated specs ?

and is there anyother additional Dyno Pipes/Mufflers
hooked up to your Exh System while on the Dyno ??
..or you able to just use your Headers "without" any additional Dyno hookups


Blow-thru Dyno Fan System (Fan above Engine)
or
Suck-thru Dyno Fan System ? ( Fans in rear)

[paulzig]

This is an engine supplied to us by a customer, to put into his little Mitsubishi drag car.. He had it built somewhere else, and all I can get out of it is "It makes 406 at close to 7000rpm" The pipes he supplied us are these 2 into 1 deals as mentioned earlier, but supplied to us in MANY pieces LOL... So far I'm only looking for a base line, which is proving hard because I dont think the guy even has the cam specs anymore..Let alone any dyno sheets.. Frustrating.



I'll have to buy a copy of your latest pipemax Larry, still have the old DOS one (demo) from years ago....