jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re: Light Turbo Charging of X-Trail.....How???
quote:
Y WAIT wrote:
I dont think that its all that expensive....
You have made the same comparison I did in your reply and hence my question 
quote:
A much safer option would be to scorce an SR20VET. It will prob end up being the cheaper and safer option in the long run!
quote:
Having said that i personally wouldnt do it. I have had many friends add turbos to various cars with somtimes very bad results, sure they went fast but the kept breaking everything from gearboxes to cv joints and blowing motors. Some cars just arnt ment to have stacks of power.
This is the reason I asked about the boost, because it will directly impact what our exy can take SAFELY without falling apart.
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30/May/2007, 2:08 pm
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jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re: Light Turbo Charging of X-Trail.....How???
quote:
RonV wrote:
The guy at ARB said there was an increase from 80 to 120kw at the wheels, and that this is a low pressure setup - didn't mention the pressure but at a guess given the power increase it would have to be 6-8PSI.
For 120KW (or around 164HP) increase in power they would have to be running at around 12-15psi
The standard QR25DE engine internals on our exy can NOT take more than 7psi boost safely!
Running the exy with such a high boost will surely cause problems which Matt talked about.
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30/May/2007, 2:39 pm
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jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re: Light Turbo Charging of X-Trail.....How???
Nath,
I don't think that's right mate. There is no way that a turbo-charge would only result in a 40KW (54HP) increase.
At 7psi boost the exy with standard QR25DE internals can get upto 201KW at the wheels.
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30/May/2007, 3:01 pm
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jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re: Light Turbo Charging of X-Trail.....How???
Yeah Nath, lets wait and see.
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30/May/2007, 6:23 pm
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RonV
X-TRAIL FANATIC
Date Registered: 02-2007
Location: North Shore, Sydney
TOTAL POSTS: 302
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Re: Light Turbo Charging of X-Trail.....How???
Finally met up with Hi Octane. The 2004 ST now 72K on the clock was converted when it had around 20K on it.
The turbo runs at only 4PSI (0.4 Bar), and the maximum boost you can reliably get out of this setup is 6PSI. Any more, then other engine components will need to be modified/strengthened, such as the fuel pump which can't deliver enough to the engine.
The max performance increase with just this turbo, and modified air intake is 35% over stock.
Being a low pressure charger, there is no noticeable turbo lag when driving but at low end speeds there is a lot more torque available. Less so at speeds between 80-100 (didn't get out of Sydney with it) but still a stronger pull than my own exy. I found the engine noise harsher than mine - maybe there is more padding around the engine on a Ti. There is no noise from the turbo itself that I could hear. The control box is supposed to go under the dash at the passenger side but was on the floor as they still continually adjust the setup. Hence it is obvious that this is still an experimental vehicle that they take apart from time to time to check engine wear etc.
I didn't get a straight answer to the question how many cars had been converted, other than the one I stood in front of. There might be one more.
The conversion itself was done very neat, using as little new components as possible where if you knew little about the engine you might not even notice the difference. The turbo was placed just behind the grille, and air intake modified to get the air to the turbo then back into the standard manifold on the block. Tidy setup, apart from the heat shield that was placed over the turbo before we took it for a drive. I guess the turbo is located too close to the bonnet and would probably burn the noise insulation.
Reliability? Time will tell with this one. The ST had done 50K with the turbo on it, and they are still fine tuning it. The components used look of high quality - I don't think the turbo itself is going to fail nor any of the air intake modifications as most of it is going through stock pipes. I am a little worried about having the turbo so close to the bonnet.
At 4PSI the car still runs fine on 95 unleaded. At 6PSI you'd need at least 98 unleaded. Driven normally, you might not notice any major difference in fuel consumption, however when you want to use the power available in and around the city I'm sure you'll notice. No figures were quoted.
So AUD 4K for 110kw at the wheels, 30% power increase (I guess the 120kw quoted above is when you run at 6PSI). That is still a lot of money, comparing to the exhaust modifications and gains made just with those.
Since the QR25DE wasn't really designed for turbo charging, I would be worried modifying the intake end of the engine and putting more strain on it.
Hi Octane racing has been around since 2000 (although ASIC shows they had a few name changes on the way) with a sister company in Japan.
I am sure that these guys have done a good job in making this work, but to me the difference in performance would not be worth the 4K that they charge. Fitting would only take a couple of hours and other than the turbo itself plus one angled piece of metal on the air filter to direct the flow of air to the turbo there is nothing to it.
Bring on the modified exhaust....
---
Ron X563
2011-current X-Nissan owner
2008-2011 X-X-Trail owner
2005-2008 X-Trail Ti-L
Turramurra, NSW
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14/Jun/2007, 12:27 pm
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