1FastRedSC

I don't own a 930, but i do a lot of internet surfing and randomly search for things i can't afford at the moment (which i imagine is not uncommon). Does anyone know if someone make an equal length header for the 930, and would 930's benefit the same results as an N/A car? Like better top end, broader power range, etc. <img border="0" title="" alt="[Wink]" src="wink.gif" />

Steve Weiner-Rennsport Systems

Hi:

LOL,.....The Porsche factory did just that on 934's, 935's and 956-962C's. No in-car heat, of course,....

There are some aftermarket items that claim to be equal-length, but I've not personally measured them.

On a Turbo, something like this would really enhance throttle response, mid-range torque, and make a major reduction in boost lag. Trouble is, the 930's turbocharger position is offset to the left (unlike the 934 & 935) and its VERY difficult to package the left side primary pipes to the turbo mounting flange.

To do this properly, one would either need to centrally position the turbo behind the license plate, al la 935 or retain the stock turbo mounting position and run the right side primaries under the engine case so that both sides were truly equal length.

No matter what, its not going to be easy and one might sacrifice heat...........

On a street car with mild cams, the current crop of header/muffler system fom B&B & GHL work pretty well and present no real-world power limitation. Many 930's with such exhaust systems develop well over 550 HP,.....

1FastRedSC

Thank you for the reply steve, you seem to be very knowledgable on 911's. I haven't owned the car for long enough, but after i finish this project (my trans pieces are on the way) i hope to be up there with you rennlist guru's. To finish off my forced induction fantasy, if one were to convert to turbo from n/a, would the equal length be practical in terms of price? Or would sticking to the common 930 practices be a little easier? BTW, i am getting european race headers for my sc as since here in NM, no matter what people tell you, there's no such thing as cold.

Steve Weiner-Rennsport Systems

Hi:

Personally, I would not bother with equal-length turbo headers unless I needed over 550 HP and you are willing and able to fabricate your own. Look at a 934 or 935 (single) exhaust to see what a very well designed system looks like.

I'd use a B&B header/muffler and install the appropriate turbo fo your requirements.

D

Steve,
Why B&B over GHL? I read on this board the GHL is a bit better on the quality and warranty side.

Steve Weiner-Rennsport Systems

D:

IMHO, they are comparable. GHL is a better outfit to work with, if any problem arises that you need some help with. The B&B makes a little bit more power but their customer service is not what it used to be.

Neither one is perfect so they can both be a bit of a struggle to install.

Geoffrey

Just as a comparison, I have a set of Holcombe heat exchangers that are not equal length and my car produces 641hp@1bar out of a 3.4l engine. These heat exchangers are better constructed and better flowing than the current crop from B&B, GHL, etc.

NineMeister

We also make a similar header to the B&B/GHL design, but from a thick wall/constant thickness tube that is purge argon welded to minimise the possibility of crack propagation on joints.

Steve is right, there is no advantage to equal length headers on any turbo up to 500bhp, the gains are to be made from shorter lengths reducing energy losses to the turbo and from smaller pipes improving the exhaust scavenging.

1FastRedSC

Thanks gentlemen, but now a new question arises out of curiosity. In the 951 a shorter header isn't possible, so in that case would an equal length be ideal to stabilize flow since reducing energy loss isn't possible?