3" Redback exhaust, Performance Ok but go some questions.

[WogsRus]

Ok So now a few days of having the exhaust on over all still nice, BUT, the power is ok, improved but not as much as i would have though. Boost appears ok, i backed of the VNT half a turn as it was a bit high.

Torque seems to have dropped of a little at the bottom end but is much more linear and pulls quite nice.

So for all those who have a 3", how did you find it?

Any issues to date, ie engine or anything ?

How is your boost ? On a CRD, what does it hold and so forth?

If you had your chance, would you do it again?

[MEGOMONSTER]

My boost never gets over 15 psi and have only seen it get to 15 twice normally 14psi max regularly.
I got my 3" exhaust with a chip at the same time , so performance was greatly improved.

[WogsRus]

Under power it seams to be steady at 14.5psi, as normal, but it does spike on the way up, say 17psi for a split second and then steady. I think at higher RPM though it has more like 15-16 psi, will see tomorrow on a decent high way run

[Maxhead]

It is strange your torque has dropped with the 3" as most find it should increase down in the rev range. When I tow my van (close to 3T) I can get occasional spikes up to 17 but ECU seems to fix that pretty quickly.

The main reason I installed the beaudesert 2.75 was to overcome stretching gears while towing. ex I would have to rev each gear to around 3500-4000RPM just so when I changed gear I would fall into the torque range so I could pull the van. Anything under 2100RPM was useless. Now I just drive it normally change gears at around 3000RPM and get torque from 1500-1600RPM. GOT TO BE HAPPY WITH THAT!

It should have been the first mod I made not an after thought. I wasn't after neck breaking power but better towing ability and that is what I achieved.

[WogsRus]

Yeah i guess the dyno will show any differences, perhaps its not that the tourque is higher up, but there is no more huge torque lump that i use to get from 1500 to 2000 rpm, now its just constant i guess.

[Maxhead]

Yeah i guess the dyno will show any differences, perhaps its not that the tourque is higher up, but there is no more huge torque lump that i use to get from 1500 to 2000 rpm, now its just constant i guess.


Yeah, great idea. whack it on the dyno to have a look. Might just be a lot smoother curve now to what it was before. It's funny how you got a huge lump from 1500 and mine was dead in that range. hahaha Oh well thats Nissan for ya.
Good luck with it

[Steve4wdin]

Guys, this is the exact same problem mine has. I think 3" is to big for 3l motor. I can literaltly feel the turbo / torque range at 2300rpm. Under that it wouldn`t pull the skin off a custard. I am going to change mine back to the 2.75"

[Maxhead]

Guys, this is the exact same problem mine has. I think 3" is to big for 3l motor. I can literaltly feel the turbo / torque range at 2300rpm. Under that it wouldn`t pull the skin off a custard. I am going to change mine back to the 2.75"


Which 2.75" have you got as standard is 2.5" and I think only beaudesert makes 2.75..... Anyway the guys that put the 2.75 have been very happy with results so the above comment is probably very valid.

[Steve4wdin]

At the moment I have a full s/s turbo back mandral bent system. Now it is for sale It is only about 8000k`s old

[WogsRus]

Well after a decent stint on the road I must say the improvement is noticible. I think I was spot on, tourqe range is much smoother no big lump just constant pull. My brother drove it and imediatly noticed the differance. Will be interesting to see what the dyno shows. Boost controll is spot on too no over post no limp mode.

[create]

It took about 1000km of driving before my exhaust made any difference. It now runs great and I am really happy with it. Fuel economy is down 1L/100km and I have an improvement in low down torque. I also cleaned my MAF which helped too.
I put on a 3" scotts rods

[boots]

Not so sure about CRD engine exhaust size but can confirm on the DI engine the factory exhaust system diameter is only 2'' and 1 3/4 '' from turbo flange to cat . Have just fitted the 2 3/4 '' beaudesert system to mine and I dont like it at all .... I love it ..

[kevin07]

Guys, this is the exact same problem mine has. I think 3" is to big for 3l motor. I can literaltly feel the turbo / torque range at 2300rpm. Under that it wouldn`t pull the skin off a custard. I am going to change mine back to the 2.75" hey steve how are you i noted twice now your not that happy with exhaust you should call shev and tel lhim what s goin on see what he can do as he is under the impression hes got the ducks guts exhaust system he should be able to back his system.kev

[Steve4wdin]

hey steve how are you i noted twice now your not that happy with exhaust you should call shev and tel lhim what s goin on see what he can do as he is under the impression hes got the ducks guts exhaust system he should be able to back his system.kev
Kev, Good thinking mate, I will do just that and let you know how I go. Have a good holiday mate and catch up in new year
Steve

[threedogs]

What motor do you have Steve4wdin???

[WogsRus]

Well now some 400km under the belt and i must say the performance is actually staggeringly better, just as i though, the torque range is simply nice and liniar, no more big bang and nothing.

[Maxhead]

Well now some 400km under the belt and i must say the performance is actually staggeringly better, just as i though, the torque range is simply nice and liniar, no more big bang and nothing.

Great news mate, Any idea when the torque starts coming on?

[WogsRus]

Starts to build at 1600 but at 1800 really going and by 2000 its well and trully on the boil. Loving it. On the highway its just great.

[WogsRus]

One thing to note it still pulls well and trully into the 3800 range