Users browsing this forum: No registered users and 15 guests
| |||||
Do up pipes make much difference to performance? what kind of power gains we talking if any?
There can be only WR1!
My mate has one of them fitted to his car, i feel its a bit to loud the blitz. Worth a look depending on price, is it a full 3 inch system.
There can be only WR1!
he said it cost 580, so i take it that must be for a full system, think he is looking for 380
3inch apart from where it joins the cat (2.5inch)
Yes I have the Nur Spec R. I personally love the BOOM BOOM but we do only drive our WR1 for weekend fun. I get in other Scoobies and think they are awfully quiet. Remap - no need since you aren't removing the Cat.
Surely this exhaust wont make much difference performance wise, being 3 inch bore it is still restricted by the 2 and 1/2 inch downpipe.
There can be only WR1!
Thats not quite how it works WR1500 unfortunately or we would all be running around with 5" diameter exhausts!
Imagine your car is pumping out 320 BHP of exhaust gas. It goes through some small diameter headers, into a larger diameter up pipe, spins the exhaust turbine, goes down a 3" downpipe and through a bloody great cat, tapers for a short while to 2.5" then back to 3" before exiting the car. You can see that the main restriction will be the cat. Larger diameter pipework means the capability to flow more gas, but if you think back to physics it will also slow the gas speed down. This is very important pre turbo but also gas speed, pressure,etc after the turbo has an effect on scavenging the cylinders. At this 320 BHP level, the 2 1/2" section is more than adequate to flow the amount of gas required at a decent speed. If you put a 3" on all you are doing is putting the same amount of gas through a hole that was already fit for purpose when it was a bit smaller. i.e you gain nothing. At say 370 BHP, the 2 1/2" section is a bit restrictive. put a 3" system on at this point and you may well see a 10 BHP+ rise. A 3" will see you up to 500 BHP+ before you need to think about anything bigger, unless you like to tell people in pubs you have a 3 1/2" sysyem so your car must be faster. All the cat back systems wether 2 1/2" or 3" only give you a very small power increase, and this is just because the pipework is straighter and they are better made. If you want noticeable power increase you should look at the decat and remap route. If you have no plans to change your turbo in the future, save money and put a 2 1/2" system such as the NUR spec on. If however you have further plans, then you would be wise at this stage to get a 3" system and save yourself money in the long term.
Thanks mate, your a great help. I find this exhaust business hard to get my head round i dont what to buy something that I'll end up replacing, or buy something then not get a re-map same then my car go pop, you know what i mean!
There can be only WR1!
as simple as i can make it-
Any system that fits up to your existing downpipe will be 2 1/2", will not require a remap, will not blow your engine, will make a small handful of BHP improvement. This is the one to go for if you are just after a bit of noise. Any 3" thro' system will require a downpipe to suit. you can have a decat downpipe for the biggest gains, or a hi flow one for a small amount less. Both of these options you should really have a remap, if you dont it may still be all right if you use some NF and install a knocklink to give you a warning. If you are eco-friendly, dont have a friendly MOT man and dont want the hassle of changing your downpipe at MOT time take the hi flow cat option. If you want max power and have a MOT man that takes a back hander save yourself a lot of money and get a decat one. If you are planning on seriouslly hiking power in the lomg term, forget the 2 1/2" option. Final option is youcan have your existing downpipe modified with a 3" end if you so desire, although as stated above this is not going to gain you anything.
We do try
I agree, sorting out exhausts and systems etc........is exhausting. When you sort out which way to go, there will be minimal power diferences between the systems (I.e a Milltek cat back will give very much the same power as a Blits NUR spec cat back) Just base your decision on looks, sound that you like, quality, and price.
i like the look of the TSL Firestorm, they look well good. Not heard one mind, i dont what a loud exhaust, my missus will want a divorce.
There can be only WR1!
I would disagree with this bit. I've been running on ported OEM headers with a matched up-pipe and the car feels like its gained some good torque. The combination of headers and up-pipe have lowered the spool of the turbo by 200 - 300 rpm. I'm now hitting 1 BAR at around 2,700 rpm in 5th gear. So I've got more torque over more of the rev range. The car feels more alive off turbo as well around the 2,500 to 3,000 rpm area. Personally, I would keep the standard exhaust and fit some ported headers and the matched up-pipe. The whole lot will cost you about Engine: FMIC with K&N CAIK, Oil Catch Can & MD321H turbo. Next mod: TBD
Brakes: Turbo Groove Discs, Pagid RS29's & Braided Hoses. Suspension: Whiteline front and rear ARB's, ALK
I was talking about an aftermarket up pipe Anders, which are almost all of a significantly bigger diameter than a o.e one, hence slower spool.
The ported ones (along with headers obviously) work very well indeed and for a moderately tuned car is by far the best option. I have done a few sets for people and all have said they notice a significantly better spool up.
Ah, ok! I've heard the ported OEM's match well to a TD05-18G. I plan to fit one of these next year, when the warranty is out. I'll probably fit one of Harvey Smiths FMIC's for about
Engine: FMIC with K&N CAIK, Oil Catch Can & MD321H turbo. Next mod: TBD
Brakes: Turbo Groove Discs, Pagid RS29's & Braided Hoses. Suspension: Whiteline front and rear ARB's, ALK
aps system is the daddy - we just fitted one to our WR1
3.5" straight through. i think the pro drive one was 2 and 1/4 inch
Any problems with the turbo blowing the hoses off with the 3.5" system? Crash bang wollop!!
running sweet as a nut!!
here it is - running 376bhp and approx 370ft llbs of torque 1/4 mile in 11 secs They mapped is safe for every day use - could have done it to 430bhp, but would have caused problems to the internals. after christmas is the next stage with the stroker, ecu etc which will easily boost it up to 550bhp plus.... the car sounds nuts and there is no lag what so ever... it goes like a supercharged car with boost from the get go!!
[quote="Anders_WR1"]Ah, ok! I've heard the ported OEM's match well to a TD05-18G. I plan to fit one of these next year, when the warranty is out. I'll probably fit one of Harvey Smiths FMIC's for about
2007 BMW M5
2004 Petter Solberg STi
Give us a run down on what you have had done 2007 BMW M5
2004 Petter Solberg STi
this is it so far:
Engine: GFB Stealth FX BOV Buddyclub Positive charge unit Banner Unibull 4 point battery STI Earthing kit Walbro Fuel Pump HKS Turbo timer HKS Iridium Plugs HKS Guages In Triple Carbon Pod APS 3.5" turbo back exhaust APS header 4-2-1 Header Blitz SBCI Boost Controller APS Induction kit Induction Kit GFB 3 Pulley Kit inc belts Power Enterprise Timing Belt Power Enterprise Oil Filter Re-map ECU Power Enterprise Injectors APS SR40 Turbo APS Top Mount intercooler Fuelcat Suspension: Tein Type flex suspension & EDFC controller Osaka Carbon Fibre Strut Bar Whiteline Suspension Parts (everything they list in the book for the car exc anti roll bars) Brakes: Brembo 4 pots EBC Red Stuff ceramic pads EBC Turbo Groove Discs Exterior Styling: Osaka STI8 Carbon Spoiler Carbon fibre FQ style Diffuser Custom Carbon Fibre Ganador Style Mirrors Chragespeed full kit inc wings STI Mud flaps Interior Styling: Carbon Fibre Custom Guage Pod Misc Mods: PIAA Lighting AES HID conversion PIAA Wipers PIAA Sports Horn GFB 6 Speed Short Shifter Tein Bonnet damper kit Osaka front carbon strut bar Cusco rear strut bar Wheels: Trafficstar RTS in custome gold 18
no problems with this or anything else so far - touch wood!!
Not anymore for me since fitting of Samco hoses Osaka, have similar engine stuff to you, APS stuff, running virtually identical power etc 2007 BMW M5
2004 Petter Solberg STi
| ||
Who is onlineUsers browsing this forum: No registered users and 15 guests |
||