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#91 | ||
Banned
Join Date: Mar 2010
Location: PERTH. WA
Posts: 4,697
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I never said hurricanes were a restriction at any point,i said my extractors were said to be a restriction.
I did say the have the same pipe sizes but a smaller collector. Im not saying anything is right or wrong about your setup t man but ive been stung a few times listening to advice on aff and its cost me dollars,that makes you want proof before outlaying $$$$$ I only ever wanted some proof why pacies are worse off than hurricanes,its kind of got off track a bit,from what I can see its a trade off. Bigger primaries and smaller collector against smaller primaries with a bigger collector which needs a further restriction in the exhaust to counteract the bigger collector,definitely is a trade off,or am I misinterpreting the info im reading? That's why I said is it just a marginal thing? 6 of one,half a dozen of the other. that's the way I see it. Last edited by STINKY NINJA; 01-08-2016 at 08:48 PM. |
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#92 | ||
Regular Member
Join Date: Jan 2006
Location: Sydney , N.S.W
Posts: 427
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Fair enough but you did say that you headers had the same primary pipes as the hurricanes meaning that there is a possibility that the hurricanes could also be a restriction. But just to add. While my car is supercharged its a centrifugal supercharger and does not make any boost untill around 2500 to 3000rpm. In saying that the hurricanes were fitted before the car was supercharged. . While I honestly cant compare them directly with the pacemakers. I did remove a set of hm headers for the hurricanes and they made a slight improvement in low to mid torque.. But this is just my experience with my car and what works for one doesn't always work for another.
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#93 | ||||
RIP...
Join Date: Dec 2004
Posts: 15,524
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Quote:
They should be a little in front, but it won't be huge. They will however make good amounts more than a bigger tube 4-1. Quote:
Twin 2.25" pipes will support well over 400hp. There's plenty of NA T3's making ~450hp with Hurricanes. Edit - To add more to the confusion, my money is on the Advance tri-y's to potentially be even better than the Hurricanes. They have the same size primaries, but a bit longer. Good. They have larger secondaries, but longer. Also good. Same size collector. It's fair to say the Advance has more potential, without giving away anything down low. I have nothing to prove this, except theory.
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. Oval Everywhere... Last edited by Sox; 01-08-2016 at 08:54 PM. |
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#94 | |||
Banned
Join Date: Mar 2010
Location: PERTH. WA
Posts: 4,697
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Quote:
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#95 | |||
Banned
Join Date: Mar 2010
Location: PERTH. WA
Posts: 4,697
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Quote:
Pretty sure advance headers are made for gt40p into e series as well,might have a look at them. I might come across as harsh but im only after the correct info,i was **** at computers at school,nobody taught me computer ettiquite ![]() |
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#96 | ||
Donating Member
![]() Join Date: Nov 2011
Location: Melbourne
Posts: 4,570
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Don't think it will help much but.........my car came with a set of tri y pacies in the boot which i will be fitting in the next month or so, i know many here prefer the hurricanes but i have the pacies already so that's what I'll be using. The car is very close to being stock and currently has the factory headers and cats with twin 2.25 all the way. Once i fit the pacies with hi flow cats i will be sure to report any difference in driveability which I'm expecting quite a bit of difference over factory set up.
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#97 | ||
Banned
Join Date: Mar 2010
Location: PERTH. WA
Posts: 4,697
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I do appreciate the info you guys are giving me though.
I also have new ph4000 sitting in the shed,not sure if ill be selling them,keeping the ones I have fitted now or buying some other ones! So much info to process,my brain is melting after dealing with my daughter all day. |
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#98 | |||
RIP...
Join Date: Dec 2004
Posts: 15,524
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Quote:
Primary Secondary Outlet 1 1/2" 1 5/8" 2 1/4" Then you're probably as good as you'll get for low end grunt, depending of course on the pipe lengths. Changing to a different header in your case won't achieve much.
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. Oval Everywhere... |
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#99 | ||
Banned
Join Date: Mar 2010
Location: PERTH. WA
Posts: 4,697
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My hitech extractors aren't even mandrel bent... ffs
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#100 | ||
RIP...
Join Date: Dec 2004
Posts: 15,524
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Neither are my custom made jobbies on the P250, nor is the rest of the system.
Shallow radius press bends have almost no negative consequence to flow.
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. Oval Everywhere... |
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#101 | ||
Banned
Join Date: Mar 2010
Location: PERTH. WA
Posts: 4,697
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I suppose my ugly *** hitech anorexic headers might be called into service for a bit longer,like forever.
Thanks for all the info guys,might put this one to bed. |
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#102 | ||
FF.Com.Au Hardcore
Join Date: Dec 2004
Location: Perth NoR
Posts: 5,970
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Leave the headers you have Shannon, I seriously doubt you'd notice enough of a gain to justify the change.
FWIW most of you know I fitted Difillipos to the TE along with bashed out cats (as received, it wasn't me officer!!), on the dyno we gained horsepower above 4800rpm, approximately 5hp by 6000. Below 4800 it was behind the stock headers and cats. Recently I had the original pipes refitted as I return the vehicle as close to stock as practical and the improvement in throttle response and torque right off idle is most definitely noticeable. 'Seat of the pants' feel rarely corresponds to a dyno figure, as a dyno cannot measure throttle response or rate of acceleration, and this is exactly where smaller diameter high velocity pipes (headers and cylinder heads as well) really shine. |
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#103 | ||
Sick Puppy
Join Date: Jul 2006
Posts: 1,963
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On our AUs Ive always just run the Standard Tickford Headers with the collector stretched out to 2.5" with a set of high flow cats.
Never done me any wrong yet. |
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#104 | ||
FF.Com.Au Hardcore
Join Date: Dec 2004
Location: Perth NoR
Posts: 5,970
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#105 | ||
Regular Member
Join Date: Aug 2008
Location: Melbourne
Posts: 51
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Just Had a look under my old XR8 I bought new. Got SVO to fit new system going back over ten years ago. I think it was a HM headers set with the cats welded straight on. Pressed bends but Tri Y design, with a 2 1/2" Red back single system. Don't forget the chrome tip. That gave quite a noticeable improvement in performance and fuel economy. Cut open the air box gave it a K&N, eagle leads and Iridium plugs and had it flash tuned. Was OK for an auto, My first ever pass at Calder got a 14.5.
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AU I LTD V8 Sleeper AU II XR8 220kw SVO zorst, G&D Auto |
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#106 | ||
Peter Car
Join Date: Dec 2004
Location: geelong
Posts: 23,145
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Exhausts are a brain melt. I've been pondering what to do with my hci NL. Currently its pacies, high flow cats and dual 2.25. Thinking of stepping up to dual 2.5 and cutting off the smaller pacie collectors and making them either 2.5 or 3 inch. Have no idea what the best way to go is though. Simular set ups to mine are making 350rwhp in the US so not sure if the 2.25 inch collectors on the pacies are big enough.
Now its no longer a daily im not too fussed about low down torque. With a high stall going in and already having 3.9's it wont matter too much anyway. |
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#107 | ||
Regular Member
Join Date: Dec 2015
Location: West of Melbourne
Posts: 488
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I've gotten the biggest performance boost I could have ever planned from a totally unexpected source.................getting the transmission fully serviced.
Beforehand the trans would hold onto a gear and not change down when you accelerated until you stomped on it, now the slightest pressure and it smoothly drops a gear, or two, and takes off. I guess I'm now experiencing what it should have been like all along ![]()
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Cheers Ozrider AUII XR8 200KW FG MK2 XR6 Mini 850 Rover P5 3 Litre Mk1 |
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#108 | |||
R.I.P. Maggie
Join Date: May 2015
Location: Brisbane
Posts: 1,286
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Quote:
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AUII XR8 200Kw Ute FG XR6T 1976 289 Mustang (Gone) |
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#109 | |||
Regular Member
Join Date: Dec 2015
Location: West of Melbourne
Posts: 488
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Quote:
![]() Cost me $280 with the Speedo Actuator replaced. Fuel consumption is actually looking pretty good since I got it done.
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Cheers Ozrider AUII XR8 200KW FG MK2 XR6 Mini 850 Rover P5 3 Litre Mk1 |
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#110 | ||
FF.Com.Au Hardcore
Join Date: Feb 2008
Location: Perth, Northern Suburbs
Posts: 4,886
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#111 | ||
Regular Member
Join Date: Dec 2015
Location: West of Melbourne
Posts: 488
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Damn, have they broken it????
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Cheers Ozrider AUII XR8 200KW FG MK2 XR6 Mini 850 Rover P5 3 Litre Mk1 |
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#112 | ||
R.I.P. Maggie
Join Date: May 2015
Location: Brisbane
Posts: 1,286
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Whoops
__________________
AUII XR8 200Kw Ute FG XR6T 1976 289 Mustang (Gone) |
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#113 | |||
Regular Member
Join Date: Nov 2018
Location: Melbourne
Posts: 36
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Quote:
I'm looking at changing diff gears other than speedo corrector what else do i need? Probably changing to 3.73 i have a AU3 XR8 Auto Sedan. Do i just dyno it? I need to know everything from start to finish. Thanks for your help... |
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#114 | |||
Regular Member
Join Date: Nov 2018
Location: Melbourne
Posts: 36
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Quote:
Do you need to change the speedo with a corrector, then get the car dynoed to change the shift patterns in the tranny? Thanks for your help on an old post. |
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#115 | ||
RIP...
Join Date: Dec 2004
Posts: 15,524
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Just need the corrector, no need for dyno.
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. Oval Everywhere... |
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