srb wrote:I got the 3'' Scotts exhaust on my MN... Main reason I got it was to lower my EGT's when running the Chipit, which it did do by about 90 degrees The exhaust alone didn't improve performance that much in the lower rpm but has helped it once above 2000rpm. I tried it without the chip first and can too say you'd be wasting your money doing the exhaust upgrade without a chip or some sort tuning. Also with out tuning there is a small chance your MN could throw an over boost code with larger than stock exhaust. Has happened apparently.
Tony wrote:Three inch dump fits fine on the MN. I used heat lag on mine to make sure nothing gets cooked.
Some MN's are still overboosting even with latest software.
I have one coming over here shortly to see what I can do as the dealers have left the owner to his own devices as he has changed/modified the exhaust.
shortSteve, your temps are nothing extreme by any means. If the phyro's thermocouple is around 2" back from the turbo (dump pipe side) 650c is safe on burst such as overtaking. 550c is sustainable on long hills. 300's to 450 is fine with all day cruising.
Tony wrote: shortSteve, your temps are nothing extreme by any means. If the phyro's thermocouple is around 2" back from the turbo (dump pipe side) 650c is safe on burst such as overtaking. 550c is sustainable on long hills. 300's to 450 is fine with all day cruising.
nicknet wrote:Old thread I know but seems to be still kicking along.
I've purchased and installed a 3" turbo back exhaust with hi-flow cat and pretty much concur with some of the really early posts on this thread. Off throttle response is a bit soft, but put your foot down over 2000rpm and watch the speedo needle dial around a bit quicker. Economy is also a lot better, I averaged about 850km's a tank on a recent trip to QLD, with gear, picked up a 2tn caravan and towed it home and averaged about 650 so I was pretty happy with that. Last time I towed something that big with standard exhaust I was lucky to get 450kms. And I haven't chipped the MN yet so can only expect to get a little better.
One thing that does bug me, and might just be might cheaper x-force exhaust system is I get this really loud "woooooh" noise when I come off throttle anywhere between 1800-3000rpm. Almoost like backpressure from the turbo or something as the dump pipe off the turbo matches the turbo exhaust diameter which is much less than 3". Anyone get anything like that with their systems? Do you think I need some work done to expand the turbo exhaust outlet?
macca002 wrote:
You able to post up a vid of the sound?
Surge can occur on diesels when the turbo is attempting to pressurize the air at a higher pressure ratio than the compressor wheel can flow at a given speed.
macca002 wrote:That is turbo dose aka turbo flutterSurge can occur on diesels when the turbo is attempting to pressurize the air at a higher pressure ratio than the compressor wheel can flow at a given speed.
Some people go out of their way just to get this sound.
http://youtu.be/Vs9ERhHTlmU
You can quiet this down with a muffler
macca002 wrote:As far as I am aware, turbo diesels dont have BOV's as they dont have throttle plates.
macca002 wrote:As far as I am aware, turbo diesels dont have BOV's as they dont have throttle plates.
Bigbirdalx wrote:macca002 wrote:As far as I am aware, turbo diesels dont have BOV's as they dont have throttle plates.
New ones do. Old didnt.
assuming u mean throttle body/ valve
macca002 wrote:Bigbirdalx wrote:macca002 wrote:As far as I am aware, turbo diesels dont have BOV's as they dont have throttle plates.
New ones do. Old didnt.
assuming u mean throttle body/ valve
If they do, I assume they still wouldn't make vacuum. Without both, a BOV wont work.
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