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 14Likes
03-18-2015, 08:33 PM
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CC Member
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Join Date: Apr 2010
Location: melbourne,
vic
Cobra Make, Engine: Robnell Blown LS1
Posts: 296
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Not Ranked
A couple of other points to keep in mind..
Make sure your cats are placed not too far away from the heads to ensure they light off properly.
Also the MAF sensor needs to be around 400mm from memory away from the throttle body so the computer has a little time to adjust air/fuel ratios properly.
One last trick is to have a new carbon canister and don't hook it up until test day so that it's not soaked with fuel vapours..
Cheers
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03-19-2015, 08:08 AM
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CC Member
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Join Date: Mar 2005
Location: Perth,
wa
Cobra Make, Engine: Pace Alumina 427 #69
Posts: 1,615
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Not Ranked
Late model cats also clean up the mixtures with secondary combustion hence cleaning up older motors with overlap cams. If mixtures are out then your Nox goes up and so on. So an older motor that runs well with new Commo or Falcon cats should pass.
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03-19-2015, 04:40 PM
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CC Member
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Join Date: Jun 2001
Location: munno para west,
sa
Cobra Make, Engine: absolute pace chassis #50 L98 & 6 speed auto
Posts: 1,141
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Not Ranked
if im using the cats and oxegen sensors and ecu that come off my donor engine a ve commy 6 litre one would think if those components are in good working order it should pass?i was going to use new oxegen sensors anyway as i get all my stuff at wholesale prices .i will try the cats and see what happens but if they need to be replaced then so be it .
__________________
a cobra is a passion anything else is just a car
i dont care what the question is .. The answer is more power!!!
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03-19-2015, 10:24 PM
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CC Member
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Join Date: Apr 2011
Location: Orange,
NSW
Cobra Make, Engine: Dax
Posts: 429
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Not Ranked
You should be fine with that setup, just make sure you put a fresh tank of fuel in it before you test, and that your charcoal canister is fitted up properly.
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04-10-2015, 06:35 AM
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CC Member
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Join Date: Sep 2014
Location: Murrumbateman,
NSW
Cobra Make, Engine: Pace 427 (#53) , LS3, TR6060
Posts: 101
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Not Ranked
So has anyone bought an engine from Preston Motors Surplus Parts Warehouse in Melb?
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04-11-2015, 09:56 PM
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CC Member
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Join Date: Mar 2008
Location: Gold Coast,
QLD
Cobra Make, Engine: Harrison #69, HSV LS2, T56, Custom rear suspension
Posts: 604
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Not Ranked
Bought my LS2 from Preston's back in 2008. No problem dealing with them. Dealt direct with Kevin Newell.
__________________
Geoff
Cobra Car Club of Qld - UAE Chapter
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04-12-2015, 03:03 AM
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CC Member
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Join Date: Feb 2006
Location: Paradise Point,
Qld
Cobra Make, Engine: Absolute Pace
Posts: 1,205
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Not Ranked
I did have a small leak on the fuel tank so raw fuel vapor was being sucked into the machine.....took a few attempts to work that out.
I would also trailer the car there and the guy would be waiting so had no time to warm it up, I even went 1 hour earlier once and he was still waiting.
the last time I drove it there went for a cruise up the freeway for a few ks and then straight for the test. Passed no worries.
Phil
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Not all driveways reach the street!
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04-12-2015, 05:10 AM
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CC Member
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Join Date: Jun 2009
Location: Sydney,
NSW
Cobra Make, Engine: RCM, Jag front and rear, LS3
Posts: 1,640
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Not Ranked
I havnt seen the test procedure, but i would have assumed the test would be at operating temperature?
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04-12-2015, 04:29 PM
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CC Member
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Join Date: Feb 2006
Location: Paradise Point,
Qld
Cobra Make, Engine: Absolute Pace
Posts: 1,205
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Not Ranked
its a good thing to run it for a while to burn off any assembly lubes, sealants paint etc.
The test doesn't take long so to have it up to operating temp before they start is a good idea.
__________________
Not all driveways reach the street!
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04-12-2015, 07:49 PM
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CC Member
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Join Date: Feb 2006
Location: The Hills,
NSW
Cobra Make, Engine: Absolute Pace
Posts: 1,354
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Not Ranked
Zedn,
I think that your cats work better the hotter they are, so it is an advantage if you run the engine as hot as possible.
Cheers,
Ben
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04-22-2015, 06:18 PM
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CC Member
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Join Date: Jul 2007
Location: Melbourne,
VIC
Cobra Make, Engine: Harrison build #98 with Supercharged 6.2L of Chev Power, TKO600 5 speed gearbox
Posts: 210
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Not Ranked
I run a LS3 and went through the testing procedure before it was slightly changed in Vic to follow the other states.
Used OE cats and full exhaust system with mufflers exiting the rear of the car. When I did the test that they were happy with I can'r recall if I had the supercharger on there or not. Did 4 tests 1st one came close with full set up, then changed a few things and took the s/c off but it still didn't pass.
LS3 is a great engine, mine stock except for the little thing bolted on tht op and has 400+kW at the wheels. I'm sure you can use LS7 heads and get better and then start doing rods etc.... but the LS3 stock parts are pretty good.
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