Guys I am in the design process of building new headers, all my research is pointing towards the TRI-Y design, at minimum I would build a stepped set of headers, that is 1 3/4" to 1 and 7/8". When building my first set I just wanted a good set that wasn't too hard to build and would do the job, these current headers will go on my other 928, the Iris blue car, the new headers will be fitted to my Honda Stroker 6.0 litre.

Before I make any major design changes I always look at two things, what are they doing is Nascar and what are the race Corvettes running. In both cases, they are running TRI-Y designed headers. The theory goes that you get better overall power with the TRI-Y design, very little gain up top but better average power. This is going to be important to me as I have a pretty big cam for this engine, although it has a quite wide LSA. This makes it even more important to get good scavenging.

So does anybody have any pics of TRI-Ys that were fitted to 928s? I know a while back Mark Anderson advised the list that there was a set for sale, I remember this thinking they were a bargain. Also I wonder if a person was to use the Y header, could you use a 2" step? That would provide some nice anti reversion.

So I remember when I first advised the list that I was making my first set of headers, there was some really helpful suggestions, I ready for some more.

Greg

 

You are sick.

 

Were did you get your info about Nascar and race corvettes? Never seen either run a tri-y. Nascars run stepped, I'm sure Corvettes run stepped or at least equal length long tube.

Edit:
Maybe you saw these ebay , these are most definietly a stepped header. Though they use a tri-y style collector. These are more of what I think of when it comes to tri-y ebay

 

Greg, go to the Burns Stainless website, and spend the money to have them run your engine configuration through the design program they have... Its worth it, because it takes all your own parameters into consideration and gives you a good recommendation on tube size, length, step, 4-into-one, or 4-2-1(tri-y), collectors, x-pipe, etc..

Sadly, if you bought all their pieces to build your system, it would cost a fortune.! Hopefully, you have a source in-country for tubes...
Good luck!

I have a set of Mark A's headers- incredible job for how little he charges.. that may be a good place to start from.

 

Here is a tri-y setup on a 928...

Tri-y headers

 

Thanks Sterling. I am ordering up some today if anyone wants a set. The lead time should be 2-3 weeks.

 

+1 Sterling, I wasn't gonna say anything, having never worked with guy... those primaries are too long for tri-y anyway, even if they did fit a 928.

Go for the Mark A headers...

 

Greg, do you have to make them because your car is RHD? Well, if you must than I recommend a copy of Pipemax to work out sizes: http://www.maxracesoftware.com/pipemax36xp2.htm

 

Thanks to all, disranger, welcome to the board, I don't understand why you make that distinction, I think in reality you are comparing very cheap headers, the mustang ones to a Pro Fab or a Burns setup, Nascar guys want the last 5 hp there is, they are using it, there is a reason it is a 11 Billion dollar business.

SVP 928, yes I am aware of burns stainless and have parts of his on my car now, I can luckily buy good quality pipes here but need to source merge collectors over your way.

928 INTL headers also impress me BTW, the value for money is enormous but Mikes question about why I am doing this is correct, the RHD aspect is a worry. Also I prefer stainless for various reasons. Thanks Mike for providing that link, very interesting.

As to the photoshop set of headers, it is infact probably all I could make at the moment, what I mean is that it is very hard to shorten the primaries and keep them equal length, my current set of headers are all with 1/2" and most are perfect or out a 1/4" This of course make tuning easier.

I think I may just stump up some money at burns as I have to buy another couple of mufflers, those lightweight mufflers BTW are great! Maybe if I but them he will give me the details I need, he does if you buy merge collectors.

Mike what are you going to do for headers? Especially given you big capacity, if anybody could go to a 2" step you could.


Greg

 

A shot of Mark A's Tri-Y's.

Give him a call Greg, I don't they've been on the racecar in awhile. My understanding is that anything that Mark A has, that isn't on the race car or in that day's lunch sack is for sale.

 

Yes everything 928 related is for sale including my race car (just ask my wife) but I did sell those headers years ago. I sure wish the underside of my race car still looked like that. That must have been right after I had the tub powder coated.

 

Hey Mark, I didn't realize it was your wife when I heard the car was for sale...
As for the tub- there is this stuff called 'soap', and people called 'employees-in-the-doghouse' to help you get that Mr Clean feeling back.....lol

Sorry for the hijack Greg, I couldn't resist.

By the way, here is another stainless supplier of equal quality to Burns..
http://www.spdexhaust.com/

 

Just so nobody gets offended- yes I have seen soap before, and yes I have been the employee in the doghouse.

 

I also have a header dilema. I have some Devek level 2 headers that I've had ceramic coated. They are works of art but I'd rather have some honkin' 2" primaries or maybe 1-7/8 stepping up to 2". I'll be anxious to see how you procede, I may have to rustle up some bigger headers, it just stinks that I had these coated and they look so good. sigh.

 

Any views on which is the better header set: 928Intl v Devek level 2? they look very similar in the pics?

Greg why not modify a set of the above to RHD? much easier than starting from scratch?

Adrian