roadsleeper

foxfrc5 - Yeah I saw that... I'll try to do a search for that thread.

Here's the link to my Pelican thread: http://forums.pelicanparts.com/showthread.php?t=467419

pzull

roadsleeper, did alex tune your car?
where did you get that old exhaust system with the cross over pipes? looks like one that I built long time ago (magnaflow muffs right?)

roadsleeper

Nope, Rhommell did, but Angmoh Tatlow built it.

The old system came with the car when I bought it. Are you the guy who designed it by researching flow dynamics and stuff?

pzull

yeah i think so. strange it came with your car as I dont think yours is my ex-car which was midnite blue metallic

For your track setup don't just go for larger pipes after the headers. you'll lose torque. Get megaphones. Burnsstainless let's you customise length, flare angle and reverse cone http://www.burnsstainless.com/Megaph...egaphones.html you need to see your dynograph to calculate the above for your desired tuning point (rpm sweet spot). Use this link http://www.headerdesign.com/extras/design.asp for calculator. Read the theory, it's interesting and works (leave out the cross pipes for track setup as it is mainly for street setup where you want broader power band but compromises a little at top end

roadsleeper

It may have been bought by someone and sold to my car's previous owner. Props for a very nice sounding, and free flowing design.

Many thanks for the links, I will have to go through them with my thinking cap on, but this will definitely help.

I am currently running a Fabspeed RSR set-up with interchangeable muffler box and straight pipes.

pzull

Do u know what the insides of the fabspeed rsr look like? Hope there isnt amixing. Chamber in there.

hackzi

Nope, wasn't me at One Fullerton. Thanks for the mod tips..... will enjoy the car as it is for now before the mod bug hits.

roadsleeper

The car has been on the dyno over the past two days as bigger injectors were fitted and it is currently churning out ~355 hp. This is with either the muffler or the straight pipes fitted, which leads me to believe that there is no mixing chamber in the muffler...

Those megaphones you posted the link for are very very interesting!

pzull

Do you have the dynographs? Right now if the straight pipes are equal diameter throughtout your tuning point will be very narrow. The megaphones spread the tuning point over a wider range of rpms. Target rpm being tuned (effect is sonic turbo charging) is determined by the length of your header primaries. It "slams" a denser fuel charge into the combustion chamber. As such the fuel mix and ignition advance need to be tuned for the new design to maximise for tuned region otherwise just slamming more air without more fuel.

You need to look at turque curve on dynograph more than power curve when selecting tuning point of your setup

I dont know what your rev range is or where peak torque is but race aircooled 911s had about 25inch long primaries when used with megaphones, tunes somewhere between 5000-6000 rpm if I recall correctly

foxfrc5

roadsleeper, sorry for the late reply as have been away for the past few weeks.

I remember seeing your car at Andy's -- was tipped off by Boris so I went to take a look. Nice nice nice!

Also remember an article in The New Paper IIRC.

NineEleven

Hi boys, I just popped by again.

Hackzi, so you juz bought yourself another 911?

I'll be exporting my beloved M5 to my other home & can finally pull out my 964 out as it's been sleeping for the past 12months!

foxfrc5

It isn't the same car. The current owner of your former car is named Simon - met him few weeks back. It's still midnight blue metallic.

Sad to see another interesting machine leave these shores but glad to know you'll still have it and will be putting the 964 back to use!

pzull

any gt3 mk1 for sale?

hackzi

Yup, 964 C2 stick..... good to be back!

foxfrc5

Yes, Fong might want to sell his 2000 GT3 which is in pretty good nick. Used to be Zanzibar Red, now metallic orange.