evil 944t

maybe but come one, the header has been out long before SOMEONE else dyno'd it.. See my point.. lots of bling out there with no proof. Did they just throw it on a stock 951/k26 and see if it made anything or did they put it on with a big turbo already installed?

hosrom_951

errrr didn't the European Car magazine show a dyno of the 951 with SFR the headers upgrade (along with exhaust) and showed gains?????

Who has the link for that article?

Porsche-O-Phile

Is there any evidence to suggest a gain with 3" downpipe and / or 4" exhaust with k26/8? What about k27/8? I'm wondering which turbo setups start to show the benefit. The Turbo-Ses are k26/8s - I'd like to see comparitive dyno numbers for those versus 951 k26/6s to see if there's a worthwhile benefit to be had by a #8 hotside upgrade and the 3" / 4" setup.

Or I suppose I could just suck it up and get that k29 someone had for sale not too long ago - I can pretty much guarantee a benefit with that monster!

NZ951

IIRC they had a koklen stage 5 turbo on it. I just read the article again, Lindsey Racing supplied the exhaust for the project, and it didnt fit... I know many have had fitment issues with their exhausts but you would think they would get that one right! I mean the guy is writing about the product in a mag!!!

hosrom_951

POP: I dont think the 3" would even fit the #8 hotside (would it?) a testpipe would help improve the flow of gases escaping, thus help reduce back pressure though (right?)

evil 944t

the #8 hotside housing is bigger but the exhaust exit is the same as the #6. A so called 3" down/test pipe will fit, if that was what it was built for.

hosrom_951

evil: Yes, i am aware that the #8 and #6 hotsides have the same exhaust exit, but a 3" testpipe fits the stock turbos because they are reduced when it meets up with the stock downpipe (which is 2 1/4" diameter).

Here is a pic from SFR comparing their 3" testpipe with the stock turbocharger downpipe:



Now, this is SFR's 3" trubo downpipe with their 3" testpipe:



Note the testpipes are different, one is a reduced version for the stock downpipe, while the other one is a 'true' testpipe made specifically to bolt up the 3" downpipe.

Thing is, SFR told me that there is no need to go 3" on the downpipe on the stock Turbo, the SFR stage 4 turbo requires that 3" downpipe (and along with the 'true' 3" testpipe).

evil 944t

Thanks but your not telling me something I don't already know.

Is the SRF turbo a true garrett or is a KKK #8 hotside? Thats what you need to know..

hosrom_951

Evil: Sorry, i thought that part needed some attention

SFR turbocharges come in either a #8 or a #10 hotside, their full garrett T4 turbos is a different issue.

evil 944t

well, whats the story? Did you answer your own question or what gives ?

jimbo1111

The 3" down pipe should be used if your using a stage 5 #8 housing or the #10 housing. When the #8 housing is machined to except the stage 5 trim wheel the opening is increased to almost 2 3/4". The stock #8 and stage 3 is closer to 2 1/2. If you plan on using a stage 5 trim it may benefit you to get the 3" down pipe with it. Looking a the pic above the 3" down pipe my help even with the stock turbo. The radical 90 degree turn coupled with the bottle neck to 2 1/4" there may be some gains there. How much who knows. The down pipe is a while you there item. I don't think anyone is going to go through the trouble just to install a down pipe. That is probably why there are no dyno charts around. You also have to factor in that the test pipe has to modified to 3" as well. Most 3" test pipes bottle neck down to the stock down pipe size. If your in the market for a new exhaust you may want to consider getting the down pipe as well. Your tuning plan should be well thought out from the start. It gets expensive when you back step.

evil 944t

jimbo, your post is the reason why I posted. I mean no desrespect but without real tests and numbers your verbage is bad. Stuff like "you may benefit, there may be some gains..etc" Thats no good.
I just wanted tuners to stand up, dyno parts and show some proof and get rid of the mysteries.

evil 944t

71 replies over 1k views and no tuners showed any proof that you need x size exhaust for what size turbo or HP goals you want. Is everyone happy going along with the masses?
man, sorry if I'm a downer. I just want the people to get the facts, not stories.
I'm done with this thread..
peace

Porsche-O-Phile

I agree. The price of those exhausts can easily approach $1,000 when all is said and done. That's a helluva lot of money to spend on something that isn't backed up by hard numbers. I'd feel better seeing those for different turbo setups. For that price, the gain would have to be significant for me do blow a wad that big - anything under 15 h.p. would be virtually pointless, as that'd be somewhere in the neighborhood of $70 per h.p. You can do far better by investing your performance money elsewhere.

NZ951

Well, I will have my tech edge in the car in a week or so, then after some tuning I will be hitting the dyno. I will pony up for a 3" downpipe and present the results with a stage 3 wheel and 8" hotside. So if Tim (SFR) or Powerwerks want to give me a deal . I think I may go for SFR he owes me a favour... It is actually a very quick procedure changing the downpipe on my car, most things have been deleted. The only issue is I would want to go to V-band and that would mean changing more than just the downpipe... something to ponder.