Jump to content
SAU Community

Recommended Posts

Gents ,

Please help asap,

as for the below (which is posted now in for sale section) I got a xforce 3" instaled in to my R33 non turbo and (im so stupid) loosing so much power, now

1)iIf i cant get this one sold, i wanna know how to modyfy this. can I still keep 3" inlet (4"tip) xforce mufler and connect it to 2.5" piping?

2.) This muffler has silencer installed, but will I llose power still if I use this one with 2.5" piping mild steel?

3. I still have the stock R33 2.5" piping with me, thinking of getting this muffler hooked up in to that....

Please can anyone sugget the best way out of this mess..............

FYI--

--------------------------------------------------------------------------------------------

(http://www.skylinesaustralia.com/forums/R33-3-Cat-Xforce-Exhaus-t206350.html&p=3650952#entry3650952)

Hi Guys,

Today I got a brand new Xforce 3" Exhaust Full system (3" Mild steel, with Xforce resenator with Xforce MF-LP08 4" tim muffler) installed in to my R33 non turbo - (Gosh im loosing so mcu power, so stupid I should have gone for a 2.5" system) This was installed in to my car today 16/02/2008. and I really want to sell it quickly and get a 2.5" system.

Please let me know if anyone wants to buy $600 (All orginall xforce system, Brand new)

My number is 0421 646 66, sms me or call me or PM me here....

or if anyone has a really good 2.5" system for a R33 non turbo, we can swap?

edit by eug.

search tags: 3" 3 inch exhaust cat back catback non turbo NA volumetric efficiency scavenging backpressure back pressure low power response

Lost power from an exhaust upgrade??? An exhaust upgrade usually results in more power because of the extra flow. Well at least on the NA cars I have owned. Is it louder than the old exhaust? If not there may be a restriction somewhere and that could be the cause of your power loss?

Lost power from an exhaust upgrade??? An exhaust upgrade usually results in more power because of the extra flow. Well at least on the NA cars I have owned. Is it louder than the old exhaust? If not there may be a restriction somewhere and that could be the cause of your power loss?

It is definitly louder than stock, but I think im loosing BACK pressure? due to large 3" piping............when I baught the car 1.5 years agao, it came with 3.5" piping and car was so slow, once I put 2.5" it was good, now again its bad...

I dont know im confused now, should I upgrade the cat also then? have 3"inch one at the moment, the compliance one....

Note - Muffler has the silencer still on, I think if i remove the silencer im gona loose more power.............at least that what i learnd from several forums...please correct me if im wrong.

LOL... what's with selling in here lately?

Lost power from an exhaust upgrade??? An exhaust upgrade usually results in more power because of the extra flow. Well at least on the NA cars I have owned. Is it louder than the old exhaust? If not there may be a restriction somewhere and that could be the cause of your power loss?

i think, what SkyKC means by loss of power is in fact a loss of response or a feeling of gutless'ness.

an exhaust upgrade usually does net a power increase, but in mild NA applications too big of an exhaust will reduce the volumetric vacuum/scavenging efficiency.

an NA engine simply doesn't expel enough exhaust gases to fill a large exhaust (volume) at low-medium rpm to get any decent flow. this 'flow' creates a plunging (vacuum/scavenging) type effect which actually helps draw out new exhaust gases.

It is definitly louder than stock, but I think im loosing BACK pressure? due to large 3" piping............when I baught the car 1.5 years agao, it came with 3.5" piping and car was so slow, once I put 2.5" it was good, now again its bad...

I dont know im confused now, should I upgrade the cat also then? have 3"inch one at the moment, the compliance one....

Note - Muffler has the silencer still on, I think if i remove the silencer im gona loose more power.............at least that what i learnd from several forums...please correct me if im wrong.

i'm confused as to what you actually have in your exhaust system?

stock headers?

stock front pipe?

3" cat

3" catback with 4" tip.

stick with 2.5" as a maximal guide for daily/sedate driving and try to keep the rest of the system the same size.

i guess a search prior to buying/installing your cat back would have saved you time and money. i suggest you have a read through the forums on other people's feedback.

Hi EUG,

You are spot on mate "feeling of gutless'ness." exactly wht I feel. my system got stock headers and front pipe, 3" cat and 4"tip muffler. So I will go back to 2.5" cat back,

and the muffler inlet has to be 2.5" as you say...........(3" system sound soooooooooooo coooooooool though, got really nice beat hehe, was thinking to keep the 4"tip muffler)

I read so much about this before I got this system, my mech told me that since this system has a silencer fitted that I wont be loosing any back pressure, which is wrong :yes:

HAHAHAHAHA!..

I do remeber I wrote on a thread somewhere in the NA section:

"Dont buy X-FOrce!.. It will give you cancer of the ear!"

Get a hotdog/silencer/resonater..

Any/all will help quiet the biatch up!

Becuz your car is NA, 3" is too big and you are loosing Back Pressure in the exhaust system. Right now its just a fart can all show / no go.

Take it back down to 2.25" or 2.5" but aftermarket if you want the noise and better flow.

Becuz your car is NA, 3" is too big and you are loosing Back Pressure in the exhaust system. Right now its just a fart can all show / no go.

Take it back down to 2.25" or 2.5" but aftermarket if you want the noise and better flow.

I cant find anywhere which has after market 2.25 or 2.5 system....only thing I can find is 2,5 inlet mufflers, so if im not buying some one else system, gota do a custom job maybe.....

have to sell my one first tho,, no money now...

by the way does r32 2.5 system goes in to r33 without drama or what kind of modification does it need?

and R33 gtr will go for sure I guess

Cheers

Becuz your car is NA, 3" is too big and you are loosing Back Pressure in the exhaust system. Right now its just a fart can all show / no go.

Take it back down to 2.25" or 2.5" but aftermarket if you want the noise and better flow.

HEHEHEHE you are rite, sounds nice but no go................... :laugh:

I cant find anywhere which has after market 2.25 or 2.5 system....only thing I can find is 2,5 inlet mufflers, so if im not buying some one else system, gota do a custom job maybe.....

have to sell my one first tho,, no money now...

by the way does r32 2.5 system goes in to r33 without drama or what kind of modification does it need?

and R33 gtr will go for sure I guess

Cheers

Just go to any exhaust shop and get them to make up a catback exhaust out of mild steel in 2.5inch, it shouldnt cost you any more than 300.

I would recommend selling your cat aswell and get a 2.5inch hiflow

Edited by R34GTFOUR
Just go to any exhaust shop and get them to make up a catback exhaust out of mild steel in 2.5inch, it shouldnt cost you any more than 300.

I would recommend selling your cat aswell and get a 2.5inch hiflow

I think thats the best way to do it then, did you mean 300 with the muffelr?

J

I would recommend selling your cat aswell and get a 2.5inch hiflow

Justjap has xforce 3in high flow for $200, is that the nirmal price or can I get it for cheaper?

edit- mmmmmmm u mean 2.5 cat,,,,,,,,,,,,,,ok let me see if they are same price, but justjap dont have them,

***when we say 3" cat does it mean it has 2.5" inlet then 3" outlet?

I cant find anywhere which has after market 2.25 or 2.5 system....only thing I can find is 2,5 inlet mufflers, so if im not buying some one else system, gota do a custom job maybe.....

have to sell my one first tho,, no money now...

by the way does r32 2.5 system goes in to r33 without drama or what kind of modification does it need?

and R33 gtr will go for sure I guess

Cheers

Hey SkyKC!

Im sure an exhaust place can custom make one like what R34GTFOUR said. They can work out what size cat you need too.

They will know the exact size and you can buy just the muffler (The ones you see at Autobarn / Autopro)

probley cost less than $200 and get them to weld it on but make sure the In Pipe is 2.25" / 2.5" to match ya exhaust pipe of what ever size you choose

but you can have like a 4.5" outlet for the noise.

mufflerjb5.jpg

:)

Edited by (00)SKYLINE(00)

i just got a exhaust put on my car..

non turbo, 2.25inch catback xforce system with a 4inch cannon

car is running slow due to lack of back pressure, but when silencer is in, it runs smooth and fast

diagnosis, match the piping size with the cannon size...

you will usually see non turbo r33's with twin 2" or 2.5" twin tipped canons...

good way to keep the grunt, and the power...as the air is being expelled through a pipe with the same diameter

eliminating the lack of back pressure theory....

:P:):D so to the guy who started this post, reduce piping size...and if u want a large cannon, and god knows we all do, get use to the sound of a silencer...if not, do as im about to, coz i made the same mistake as you, get a twin tipped cannon

i just got a exhaust put on my car..

non turbo, 2.25inch catback xforce system with a 4inch cannon

car is running slow due to lack of back pressure, but when silencer is in, it runs smooth and fast

diagnosis, match the piping size with the cannon size...

you will usually see non turbo r33's with twin 2" or 2.5" twin tipped canons...

good way to keep the grunt, and the power...as the air is being expelled through a pipe with the same diameter

eliminating the lack of back pressure theory....

:P:):D so to the guy who started this post, reduce piping size...and if u want a large cannon, and god knows we all do, get use to the sound of a silencer...if not, do as im about to, coz i made the same mistake as you, get a twin tipped cannon

Cool, its all clear to me now, custom is the way to go. tomorrow ill get some prices and see how it goes. will definitly get a 2.5inlet to 4.5out cannon muffler with silencer + centre resanator + 2.5 pipe + and 2.5 high flow cat.........

note - anyone knows a really good exhaust place near castle hill or blacktown area? thinking of going for xforce muffler again...

Thanks heaps guys, will let you know how it goes....

(please someone buy 3" xforce system from me........................)

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • I have been being VERY quiet about what you're alluding to, as it is something that ticks me off... The number of cars from factory that run coil overs is HUGE! Most of them these days do... The other part that annoys me, is people saying "Well all the incabin adjustable suspension is illegal by blah blah blah"... If that's the case, then why can I buy a car brand new that can do it if, FULL STOP in cabin adjustable suspension is illegal...   Also, I could just chuck some aftermarket shocks in my car, throw the stock springs on, after my blue slip, dump my super low springs back in. Same shock and spring style setup... Hell, they could also be the same colour springs etc.     I'm voting, BlueSlipper didn't want to touch the above car for some reason. Whether it be some sort of bias against the car, the owner, them maybe having previously done dodgy shit and now they're being super careful in case they get slapped in the face by the Gumbyment again... Find a new blueslip place.   And can confirm as you had said, yes there are holy bibles of vehicle heights, and all sorts of other suspension stuff. Heck your run of the mill mechanic, and tyre shop has access to all of that stuff. It's how they do wheel alignments...
    • Funny story Heading to Sydney this morning on the HWY there was some slow traffic, so I gave it the beans and midway through my overtaking "power run" I lost all power It seems that I missed a hose clamp,  and the MAF and filter went WiFi To make this more problematic, the little tool kit that lives in the boot, is sitting in the sun room at Goulburn......LOL Luckily for me I found a bit of steel on the side of the road that could be used like a rusty and bent flat head screw driver to tighten it up enough that it got me into Sydney, it is now all tight like a tiger with the aid of a 8mm socket Note to self: Use my brain and double check stuff, and always keep that little tool kit in the car for when I have a brain fart
    • Oh, and as for everyone with their fuel economy changes, I switch between E10 and 98 in the company car. Even do when I had personal cars that could run on E10. You know what changed my fuel economy in any noticeable way? How I drove, and where I drove. Otherwise, say on full tanks of just back and forth from work only (So same trips, same sort of traffic), couldn't notice a difference that I can correlate to the type of fuel in use. In the current vehicle, that's over 42L of USABLE fuel. While 98 is all "more energy dense", it also has higher knock resistance as it takes more energy to get it to ignite too. The longer hydrocarbons, typically more tightly bound. So running the same ignition map, can also produce less power, if there isn't enough time to get it all burnt through properly, as yep, the flame propagation speed is different from lower octane fuel to higher (Higher has a lower flame propagation, due to the more tightly bound and harder to self ignite funs. This is also typically where, a vehicle that is designed purely to run on 91 (Whether it be E10 or normal 91) usually sees absolutely no real world difference in fuel economy for the normal man, woman, or dog.
    • We've got some servos around me that have 91 with E10, 91 (no E10), 95, and 98. At those stations the change from 91 E10 to 91, is typically around 8c/L.   But lets not get started on the price of fuel in Oz. It's ridiculous. All the service stations around me, bar one, the price of fuel has been over the $2 mark per litre for the cheapest, 98 being around $2.45. That one service station is a CostCo, fuel from it comes from the same refineries, and makes no pitstops, it runs great, including the 98. In fact, I've had no issues on CostCo fuel, but plenty of issues at other stations!. The CostCo fuel, was $1.65 roughly this week for 94 with E10. $1.88 for 98. Servos directly across from it, $2.10 for 91 E10, and $2.48 for 98. The part I had to laugh at? If I drive multiple HOURS away from Brisbane, say out near Nanango, or Kingaroy, or even out to Goondiwindi, the price of their fuel, is the same as what it is at the CostCo... Oh, and that BP servo at Goondiwindi is HUGE and goes through epic turnover of fuel, so it's not sitting there for weeks going to shit. And what blows me away, my mate is one of the people who drives the Fuel Tanker all around QLD, delivering to all those places. At the same company his previous role was doing the "local haul" deliveries... Same truck, same driver, same pickup point it all comes from. So you tell me, how the hell it is 60c/L CHEAPER for fuel, when nearly all else is equal, except they require a B-Double to drive half a day out of Brisbane, and half a day back, every second day, compared to the delivery that can be under 30 minutes drive from the fuel pickup point... Not to mention, go five blocks down the road, and Ampol to Ampol will vary 30c/L... And I've had this conversation with my mate... The way it's priced, is just typical, pure and utter rubbish... He also does runs from Brisbane, to all over QLD, down to Newcastle, Sydney, Nowra, Melbourne, Geelong, and even out to parts of the NT depending on the companies needs. His main stuff is all the longer distance away from home for a few days at a time, then when he's back, he loves to just pickup extra shifts wherever he can in whichever truck, hence all the weird different places.   Oh, as for getting E10 into all the fuels in Australia... It was very quickly highlighted, that we don't have enough biomass available to use to make E10 sustainably like they require, and it would dramatically cut into our, and the worlds food chain supply...   I vote we all just start running on liquid methane gas... Plenty of that just getting tapped off at tips from underground decay... (Note, this is pure just stupid commenting. I could very easily highlight the reasons its not a good idea especially on scale...)
    • Am I correct in assuming that the R35's are getting the classic skyline haircut off the odometer?  Quick search on carsales, there are 33 08 and 09 GTR's for sale, only 2 of them have more then 100,000km's on them (116,075 and 110,000 respectively).  And somehow there are about 25 for sale with around 60,000kms? Looks like the classic skyline haircut to me =/
×
×
  • Create New...