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Dave4x4 Profile
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X-TRAIL LEGEND
 


Date Registered: 08-2005
Location: NEWCASTLE
TOTAL POSTS: 690
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Re: Hi-Tech X-Trail Extractors/Headers & Full Exhaust System


Jalal,
Does this weld on "50 piece" actualy stop the resonance when you take the your foot off the accelorator for deceloration because there is a hint of it in my system sometimes, it seems like an easy fix and Im all for that.
Dave

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(Dave Newcastle 2004 ST
ID: X211

20/Dec/2006, 1:10 pm Link to this post Send Email PM   Send Private Message
 
jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29094
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Re: Hi-Tech X-Trail Extractors/Headers & Full Exhaust System


Dave, I don't think they will help or play part in reducing resonance, but they will help eliminate vibration and possible cause of rattle under the car.

You should try welding them to your system regardless, for extra support to the pipes and the resonators.

The best way to check if there is anything touching the body of the car, is to put it on ramps, select (D) or put it in gear and get someone to see which section is touching the body of the car and/or heat shields.

The other spot that could cause rattles, is the left rear tail pipe (not in your case, as you only have one tail pipe) where the bracket of the fuel evaporative canister is located and may need to be pushed slightly up.

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20/Dec/2006, 1:25 pm Link to this post Send Private Message MSN Blog
 
Dave4x4 Profile
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X-TRAIL LEGEND
 


Date Registered: 08-2005
Location: NEWCASTLE
TOTAL POSTS: 690
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Re: Hi-Tech X-Trail Extractors/Headers & Full Exhaust System


Jalal,
The simplest thing can make life hell as I have found out my problem it was my exhaust tip that has been on the muffler for over a year, but in adding the extractors I must of cracked the weld when I was working on the system. I welded it today and perfect

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(Dave Newcastle 2004 ST
ID: X211

21/Dec/2006, 7:02 pm Link to this post Send Email PM   Send Private Message
 
jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29094
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Re: Hi-Tech X-Trail Extractors/Headers & Full Exhaust System


Problem solved emoticon well done Dave.

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21/Dec/2006, 7:08 pm Link to this post Send Private Message MSN Blog
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6006
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Re: Hi-Tech X-Trail Extractors/Headers & Full Exhaust System


Hi guys,

During the run to Brisbane yesterday I've started to get a vibration at higher revs.
Sounds like one of the heat shields being mentioned.
I'll try to check it out.

The main resonance settled a bit but I'll keep a check on it and try to see if anything is touching.
It might just be the system settling-in.

Regardless, I'll get the Hi-Tech guys to give it an all-over check when I return.

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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23/Dec/2006, 6:57 am Link to this post Send Email PM   Send Private Message Blog
 
jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29094
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Re: Hi-Tech X-Trail Extractors/Headers & Full Exhaust System


Where was the vibration felt Kev? Do you mean like steering type vibration? cause an exhaust won't cause that and it maybe due to the new tyres you have fitted before the trip?

Check the 2 heatshields I mentioned earlier (above the second resonator and above the rear muffler) just to make sure that these are clear.

Regardless of that, did you notice any improvement in performance that you could share with us? emoticon

Last edited by jalalski, 23/Dec/2006, 7:06 am


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23/Dec/2006, 7:05 am Link to this post Send Private Message MSN Blog
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6006
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Re: Hi-Tech X-Trail Extractors/Headers & Full Exhaust System


Definitely a vibration of something touching the exhaust or 'rattling' due to exhaust and engine vibrations being transmitted somehow.

Because of the vibration noise, wife was disturbed about something going to break so any passing acceleration was contained to passing lanes (as it should be Brett emoticon )so a long distance was available to use gentle acceleration to avoid the noise.

Did find however that the vibration seems to appear after the car has run and been at operating temp for a while.

Had to urgently catch a local ambo here yesterday to give him some kit he left behind (not after seeing me) and gave the Exy a few blats to catch up. Acceleration was very nice with free revving out to 6000rpm in second and plenty in reserve after the change to third.

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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24/Dec/2006, 6:25 am Link to this post Send Email PM   Send Private Message Blog
 
jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29094
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Re: Hi-Tech X-Trail Extractors/Headers & Full Exhaust System


No worries Kev, when you return, the guys at Hi-Tech "emergency ambulance" services will attend to your exy and check the symptoms emoticon

Meanwhile, try not to have a heart attack over it while you're away and enjoy your holidays LOL

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24/Dec/2006, 6:40 am Link to this post Send Private Message MSN Blog
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6006
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Re: Hi-Tech X-Trail Extractors/Headers & Full Exhaust System


Jalal,
During the discussion about the O2 sensor position on Dave's extractors in the My Money Box in the Member's Rides thread, I noticed that our Hi-Tech extractors have cyls 1&3 joined and cyls 2&4 joined.
I thought the theory of extractors was to lower the exhaust pressure by only exhausting one cyl into a given join in sequence ?
If this is true then with our 1-3-4-2 firing order we should have cyls 1&4 and cyls 2&3 joined instead to minimise the exhaust pressure.

Can you follow this through with the Hi-Tech guys please.
I am sure there is a reason they have done what they have and I would like to understand the technical reasons for it.

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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26/Dec/2006, 12:21 pm Link to this post Send Email PM   Send Private Message Blog
 
jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29094
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Re: Hi-Tech X-Trail Extractors/Headers & Full Exhaust System


quote:

Revhead Kev wrote:
Can you follow this through with the Hi-Tech guys please.
I am sure there is a reason they have done what they have and I would like to understand the technical reasons for it.



Kev, this has been followed-up with Hi-Tech from Day 1 of designing our extractors and the engineer who designed our extractors and joined the pipes in the order you see, suggested this will be the best pipe configuration with our 1-3-4-2 firing order of a "STANDARD" engine to tackle the low and mid range gains in terms of torque and HP.

There will be NO difference in the way the pipes are configured with un-modified and un-tuned engine. The difference in pipe configuration of the extractors will only show itself with racing and super tuned engines, where Dave's set-up (1&4 and 2&3) will be better for higher rpm (by about 1HP) while the Hi-Tech set-up would be the optimal set-up for everyday type driving at the often use of low to mid range RPMs

Keeping in mind that our x-trail is a 4WD type of car and not a super turned Ferrari, there are is absolutely no impacts on the way the extractors are currently configured.

Please refer to the page 1 of this thread where I gave a full run-down about the Hi-Tech system and described that it tackles low & mid range RPMs gains, which is why the extractors have been configured that way.

P.S. When you visit Hi-Tech about your system, Lambros will confirm the above to you and might explain things a bit better for your own comfort but I am positive of my answer and it has come from their engineer previously to me



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26/Dec/2006, 1:14 pm Link to this post Send Private Message MSN Blog
 


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