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AugustusXTrail Profile
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Date Registered: 07-2013
Location: Cowes Phillip Island Victoria
TOTAL POSTS: 123
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Turbo boost control/Blow off valve Diesel EXY 2010 manual


Hi Augustus the X Trail here, does anyone know how to control my Turbo. I'd love a bit more grunt down low when crawling in the bush, so I'd like it to come on a bit earlier. And I'd love to be able to wind it up a bit for when we go Bracket Racing over the 1/8th mile.

Also has anyone considered or done a Blow off valve on a diesel exy?

I reckon with my free reving nature I'd respond well to it. I've chatted with a lot of my Skyline friends and they reckon they make them go much harder, but theirs are real noisy.

I'd have to have a muffled one so Mum didn't know I'd had one sneaked on!

Have a great weekend all my fellow X Trails, hope your owners take you Out and get real Muddy!

Augustus the X Trail emoticon
2/Aug/2013, 9:42 pm Link to this post Send Email PM   Send Private Message Blog
 
Exywarrior Profile
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Date Registered: 10-2011
Location: Darwin, NT
TOTAL POSTS: 325
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Re: Turbo boost control/Blow off valve Diesel EXY 2010 manual


The turbocharger on the M9R engine in the X-Trail TS/TL is somewhat different to what you might have experienced in the Skyline.
It has a variable geometry turbocharger in which the boost is controlled by the ECU. Therefore I don't think there is any real way of altering the boost without going into the ECU software.
It is also because of the variable geometry technology is why there is no blow-off valve. If an instantaneous cut in the turbo boost is required the ECU simply changes the vanes to reduce the boost output. Very clever technology. Hence the M9R has no blow-off valve or waste gate.
On the up side, the Nissan-provided ECU software upgrade (mentioned in a separate thread in the Diesel section) does alter the activity of the turbo and I have found it to cut in much faster - it has certainly reduced the turbo lag.
In my way of thinking you'd want to be careful fiddling with the turbo boost yourself - it is set by Renault (the engine manufacturer) for a reason and I think they know more about the engine than most of us.

You can read more about variable geometry turbos at http://en.wikipedia.org/wiki/Variable-geometry_turbocharger

In short, the M9R doesn't have a blow-off valve because it doesn't need one. The technology is designed to provide optimal boost at a wider range of revs using a relatively small turbocharger.

Hope some of that helps.


Last edited by Exywarrior, 13/Aug/2013, 12:57 pm


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Mark T
2011 Series 4 T31 TL Auto - Twilight, factory towbar, factory mats, tinting, Cooper CS5s, cathodic protection, paint protection, yada yada...and no Provent
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13/Aug/2013, 12:33 pm Link to this post Send Email PM   Send Private Message Blog
 
Exywarrior Profile
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Date Registered: 10-2011
Location: Darwin, NT
TOTAL POSTS: 325
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Re:


What I didn't say in my last entry either was the interesting point that the Variable Geometry Turbo is cleverly controlled by the ECU to control the Diesel Particulate Filter (DPF) burn process. When a DPF regeneration is required, the VGT is actually slightly reduced in efficiency by the ECU. This increases the exhaust gas temperature and thus assists the DPF burn.
It also explains why the fuel consumption increases markedly for the few minutes it takes the DPF burn to complete.
Overall the VGT is a pretty amazing piece of kit and in my view it's just not worth fiddling with.

---
Mark T
2011 Series 4 T31 TL Auto - Twilight, factory towbar, factory mats, tinting, Cooper CS5s, cathodic protection, paint protection, yada yada...and no Provent
X-2099
14/Aug/2013, 7:19 am Link to this post Send Email PM   Send Private Message Blog
 
AugustusXTrail Profile
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Date Registered: 07-2013
Location: Cowes Phillip Island Victoria
TOTAL POSTS: 123
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Re: Turbo boost control/Blow off valve Diesel EXY 2010 manual


 emoticon Hi Exywarrior, thanks for your insight on the VGT, it's new to me and my Skyline friends certainly do have a completely different type of turbo, so thanks for explaining it. Come to think of it, I have gone a bit quicker since my ECU software upgrade, I just wish to go a bit quicker still, love leaving fancy sports cars in my wake at the lights!!!! LOL!!!!!!

And yes Reno know best! But I only want a little more for short spurts, not long hauls. Anyhow I'm getting a CHIP soon, Yippee! That should see me a bit more flexible in the bush, and will definitely cut my 1/8th mile times somewhat! But what I really want is more consistency, as that is what bracket racing is all about!

I've just been on a big trip, from PI to Adelaide, then on to Wentworth via Lake Victoria, Boy did I get Muddy on that road, LOL, and I'm now home on PI.

Thanks again for answering my question, Keep safe, tread lightly, and get Muddy! LOL Augustus the X Trail emoticon
17/Aug/2013, 1:28 am Link to this post Send Email PM   Send Private Message Blog
 
DogTrail Profile
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Date Registered: 05-2012
Location: Sunshine Coast
TOTAL POSTS: 481
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Re: Turbo boost control/Blow off valve Diesel EXY 2010 manual


I've possibly missed the point, but Augustus, if you want to blow them off at the lights, you should drink petrol, not diesel.

Last edited by DogTrail, 17/Aug/2013, 9:24 pm


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2011/12 Australia:- 2.5 litre petrol 4WD, Series IV ST, CVT : + some gadgets and cosmetic add-on's. Dirt, (it protects the paintwork) X-2429(c).
17/Aug/2013, 9:17 pm Link to this post Send Email PM   Send Private Message
 
AugustusXTrail Profile
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Date Registered: 07-2013
Location: Cowes Phillip Island Victoria
TOTAL POSTS: 123
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Re: Turbo boost control/Blow off valve Diesel EXY 2010 manual


Hi DogTrail, I don't like the taste of petrol, emoticon makes my tummy upset and they have to drain my tanks, very expensive, both Mum and Dad have made that mistake, thankfully they worked it out before they started me!!!!

I think your forgetting that I have a !@#$load of torque on tap, If Dad winds me up the right way, takes me way past 4500 rpm and nearly to the fuel cut and is ultra slick through the gears (and he is!!!) I'll leave a lot of cars in my wake, especially up hills!!!!

Our best score yet, a 911 turbo Porsche, that was trying real hard up to 60 Klicks, we let him speed after that, as we only speed on the track. We cut an awesome light and had him by half a car length all the way to 60, probably could of had him to 80 to if the speed zone had of been higher.

We regularly embarrass sports car and V8 owners at the lights. The real hard part is stopping me from spinning off the line and all the way through second gear. Can your petrol Exy do that?

I'm looking forward to my new upgrades once my warranty is expired, then Dad has promised me a big day out at the DRAGS, Yippee. Love the drags, I don't have wheel-spin issues there, due to the sticky traction compound they use.

Dad also reckons if we lose traction with the new upgrades I'm getting some smaller 16" yet much wider wheels fitted with low profile drag slicks, that will lower my gearing and then I'll leap off the line.

Many may ask why?

Because we can! And its great fun when I blow ultra serious Bracket racers away and take a trophy or two home, LOL.

Remember when you Bracket race you are racing your own time, so consistency counts more than anything else, and me and Dad make an awesome team, we are so consistent we even blow our own minds!

But I really love going off road as well and showing the pretender big buck bitumen bashing 4X4s how to do it with style and finesse! I love getting real Muddy.

Just had a great high speed mud run on the way past Lake Victoria last week, 100kph most of the time and monster patches of glorious mud to blast through at high speed, I got ultra muddy and loved every bit of it. As Mum was on board we had to stay straight, or we would have been ultra sideways as well, yee haa!

Dad and me also got vertical for a bit coming off a levy bank, it was washed out ahead, and we didn't feel like backing up for several hundred meters, so we just bailed over the side once Mum bailed first! LOL I was balanced on two wheels for a moment, Mum got a great photo of me and Dad going over the edge with my back right a good foot off the ground. Great fun, I love lifting a leg every now and then and going into tripod mode, LOL.

Dads gunna wash me tomorrow, Mum insists on it, I'm not allowed to wear my mud for more than a couple of days.

Well I'm outa here, gunna have a wash and then get Muddy again. Keep well all you X Trails out there, hope to meet some of you sometime, Bye, from Augustus the X trail emoticon

Last edited by AugustusXTrail, 18/Aug/2013, 11:16 pm
18/Aug/2013, 11:10 pm Link to this post Send Email PM   Send Private Message Blog
 
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Date Registered: 05-2012
Location: Sunshine Coast
TOTAL POSTS: 481
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Re: Turbo boost control/Blow off valve Diesel EXY 2010 manual


quote:

Many may ask why?



Well, I did once. Now I know why.

Because it is fun.

No other reason required.

There may be a lesson in that.emoticon

Edit: What would be the 0-100 Kph (by Gps as tyre radii do vary) time be for your beast?

Last edited by DogTrail, 23/Aug/2013, 2:54 am


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2011/12 Australia:- 2.5 litre petrol 4WD, Series IV ST, CVT : + some gadgets and cosmetic add-on's. Dirt, (it protects the paintwork) X-2429(c).
20/Aug/2013, 9:13 pm Link to this post Send Email PM   Send Private Message
 
AugustusXTrail Profile
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Date Registered: 07-2013
Location: Cowes Phillip Island Victoria
TOTAL POSTS: 123
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Re: Turbo boost control/Blow off valve Diesel EXY 2010 manual


HI Guys, I'll have to check the 0-100km via my deadly accurate GPS companion April soon. Dad cant find my last time slips! emoticon

But rest assured we are going soon to do some new runs before I get my upgrades so we have some new times to compare to once the upgrades are done, ain't no dyno better than the strip!

One thing though, we do remember that they were improving heaps as my mileage went up, my donk was real tight, it's only just starting to get free near the end of the warranty period!

Hey I love rippin' em off at the lights and keepin' em wonderin' whats under my hood!

If only they knew it was a bog stocker!!!!!!!! emoticon

Dad reckons he cant wait till he can justify to Mum that my donk needs a rebuild!

He reckons I'm gunna be sick as then, in the right way of course. Lifted compression, better quality lighter pistons and molly rings, custom rods and a crank rework to increase my stroke for even more torque, plus a complete re-balance that will hopefully delete my power robbing balancing shafts!

He is also going to give me a head rework, port rework on the inlet side with tumble groves to stir the incoming air, and smooth as a baby's bum on the exhaust to get it out quicker to my turbo.

Reckons he's also going to give me some new cams as well, to increase my torque even more.

Cant wait for Mum to come to the party, though it might be a couple of hundred thousand clicks from now! emoticon

One thing Dad really wants to do though is to change my diff ratios, he reckons they are way to tall. So he is looking into getting a custom set made for me. Boy with lower diff ratios my gearbox ratios will be slightly closer together as well, will I ever leap off the line then, and also perform better in the bush. emoticon

Dad reckons if enough exy owners are interested we could do a group buy on them, any one interested? emoticon

Well Dads about to give me a wash, he's managed to delay it for a couple of days.

I love showing off my mud, sure makes the bitumen basher's look twice! emoticon

He's promised me though that we are going to sneak off on the weekend to take some photographs in the bush, we've just found a big wedgie nest, so were bound to find some real muddy tracks as it has been raining pretty well down here on the Island.

Well I 'm outta here, Have a great weekend all you fellow exys, and go and get real muddy, know I am, Augustus the X Trail

PS I went from the PI GP circuit to Wonthaggi yesterday, and passed over 30 X Trails coming the other way in less 40 minutes. A couple of them were two bob snobs and didn't say gu'day, but the rest were as friendly as. Just shows how popular we are! emoticon emoticon
23/Aug/2013, 7:43 am Link to this post Send Email PM   Send Private Message Blog
 


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