Interesting VIAS TSB - low rpm power loss
06-30-2003, 05:41 AM
#1
Supporting Maxima.org Member
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Join Date: Sep 2000
Posts: 2,038
Interesting VIAS TSB - low rpm power loss
I happened to come across an interesting vias tsb when downloading the tsbs for my 2000.
As most know, the variable intake runner system (vias) has one setting under about 5200 rpms and then by vacuum actuation flips the runners to a different length at greater than 5200 rpms to maximize high rpm power.
Apparently the hose leading to the black vias box can become kinked causing the runners always to be in the same position they would be in above 5200 after the changeover.
The result is a low-rpm (below 5200) power loss.
(Of course they still haven't come out with a tsb for the high-rpm vias problem I had).
As most know, the variable intake runner system (vias) has one setting under about 5200 rpms and then by vacuum actuation flips the runners to a different length at greater than 5200 rpms to maximize high rpm power.
Apparently the hose leading to the black vias box can become kinked causing the runners always to be in the same position they would be in above 5200 after the changeover.
The result is a low-rpm (below 5200) power loss.
(Of course they still haven't come out with a tsb for the high-rpm vias problem I had).
07-03-2003, 08:45 AM
#4
Member
Join Date: Mar 2003
Posts: 71
Re: Interesting VIAS TSB - low rpm power loss
Originally posted by Max_Gator
I happened to come across an interesting vias tsb when downloading the tsbs for my 2000.
As most know, the variable intake runner system (vias) has one setting under about 5200 rpms and then by vacuum actuation flips the runners to a different length at greater than 5200 rpms to maximize high rpm power.
Apparently the hose leading to the black vias box can become kinked causing the runners always to be in the same position they would be in above 5200 after the changeover.
The result is a low-rpm (below 5200) power loss.
(Of course they still haven't come out with a tsb for the high-rpm vias problem I had).
I happened to come across an interesting vias tsb when downloading the tsbs for my 2000.
As most know, the variable intake runner system (vias) has one setting under about 5200 rpms and then by vacuum actuation flips the runners to a different length at greater than 5200 rpms to maximize high rpm power.
Apparently the hose leading to the black vias box can become kinked causing the runners always to be in the same position they would be in above 5200 after the changeover.
The result is a low-rpm (below 5200) power loss.
(Of course they still haven't come out with a tsb for the high-rpm vias problem I had).
What problem did you have with your VIAS. I'm wondering if I have a problem with mine. The car seems sluggish sometimes at WOT and doesn't pickup speed.
07-03-2003, 12:30 PM
#5
Newbie - Just Registered
Join Date: May 2003
Posts: 6
Re: Interesting VIAS TSB - low rpm power loss
Originally posted by Max_Gator
I happened to come across an interesting vias tsb when downloading the tsbs for my 2000.
As most know, the variable intake runner system (vias) has one setting under about 5200 rpms and then by vacuum actuation flips the runners to a different length at greater than 5200 rpms to maximize high rpm power.
Apparently the hose leading to the black vias box can become kinked causing the runners always to be in the same position they would be in above 5200 after the changeover.
The result is a low-rpm (below 5200) power loss.
(Of course they still haven't come out with a tsb for the high-rpm vias problem I had).
I happened to come across an interesting vias tsb when downloading the tsbs for my 2000.
As most know, the variable intake runner system (vias) has one setting under about 5200 rpms and then by vacuum actuation flips the runners to a different length at greater than 5200 rpms to maximize high rpm power.
Apparently the hose leading to the black vias box can become kinked causing the runners always to be in the same position they would be in above 5200 after the changeover.
The result is a low-rpm (below 5200) power loss.
(Of course they still haven't come out with a tsb for the high-rpm vias problem I had).
"The 4th gen 1995-1999 has a VQ30DE engine with 190 hp/205 lbs torque, good low end power but leaves top end power to be desired. The 5th gen 2000-2001 Maxima has a VQ30DE-K with the variable intake manifold and a more aggressive cam profile. It has 222 hp and 217 lbs torque with good low end power and increased breathing in the high rpm. FYI: The K is named after Kaizen, the Japanese idea of peak performance and the spirit of continuous improvement adopted by the Japanese car industry in the 80's. The 2002 has .5L more displacement with its 255hp/246 lbs torque VQ35DE.
It also has a variable intake manifold but with an external valve that opens the secondary velocity chamber while in the 2000 and 2001 models, the valve was built into the intake plenum."
Funny how they moved to a more easily-serviceable system for the 3.5l motor...
The original article: http://www.nissanperformancemag.com/...y03/ask_sarah/
Scroll down to the question on variable-intakes.
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