Roller Dyno Smog question
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Supreme Member
Joined: Jul 1999
Posts: 5,183
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From: Oakdale, Ca
Car: 89 IrocZ
Engine: L98-ish
Transmission: 700R4
Roller Dyno Smog question
Took my RS in for smog on Friday, the tech did a visual of everything....then backed it on the rollers and started the test....I aborted the test because my fanswitch conked out, and temp was getting high...so I never saw a complete readout...anyway, I asked the guy why he didn't do a functional test under the hood...he said it wasn't necessary. as long as everything was there.
You guys/gals have the same experience, or was this guy being lazy due to the 95* heat?
You guys/gals have the same experience, or was this guy being lazy due to the 95* heat?
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Joined: Mar 2005
Posts: 1,539
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From: Honolulu, HI
Car: 2011 SS/RS
Engine: LS3
Transmission: Tremic6060
Axle/Gears: good enough
I talked to the smog tech when i got my car smoged, all they do is to make sure that everything is there. was that guy still gonna smog your car with it overheating?
Thread Starter
Supreme Member
Joined: Jul 1999
Posts: 5,183
Likes: 42
From: Oakdale, Ca
Car: 89 IrocZ
Engine: L98-ish
Transmission: 700R4
Ya, I heard it start to ping, glanced in and saw it at about 240 and told him to shut it down...
So they didn't do a functional on yours either?
So they didn't do a functional on yours either?
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Joined: Mar 2005
Posts: 1,539
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From: Honolulu, HI
Car: 2011 SS/RS
Engine: LS3
Transmission: Tremic6060
Axle/Gears: good enough
nope just made sure that everything was hooked up, although i do think they screwed with my idle adjustments, i had the idle perfect then once i got it back, i was stalling out like crazy until i warmed up.. thank *** i got a mechanical fan
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From: Brighton, CO
Car: '72 Chevy Nova
Engine: Solid roller 355
Transmission: TH350
Axle/Gears: 8.5" 10-bolt 3.73 Posi
They're supposed to look to make sure everything is there. They don't need to test any of it.
My smog guy doesn't even pop my hood though
My smog guy doesn't even pop my hood though
Thread Starter
Supreme Member
Joined: Jul 1999
Posts: 5,183
Likes: 42
From: Oakdale, Ca
Car: 89 IrocZ
Engine: L98-ish
Transmission: 700R4
I'll be darn...then it would be quite possible to run a set of heads w/o exhaust crossover, hook an egr valve up to the intake and as long as the numbers were good, you'd be okay....
I have to look into this more when I take the RS back to get another test on it.
I have to look into this more when I take the RS back to get another test on it.
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Joined: May 2004
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From: Brighton, CO
Car: '72 Chevy Nova
Engine: Solid roller 355
Transmission: TH350
Axle/Gears: 8.5" 10-bolt 3.73 Posi
yep. you can do whatever you want as long as it "looks" legal and it passes the sniffers.
Or just have the hookup and run whatever the hell you want as long as the sniffer likes it.
Or just have the hookup and run whatever the hell you want as long as the sniffer likes it.
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Joined: Nov 2002
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From: White Hall, Ar
Car: '88 Iroc
Engine: 305
Transmission: T56
Axle/Gears: 3.45
Originally posted by urbanhunter44
Or just have the hookup and run whatever the hell you want as long as the sniffer likes it.
Or just have the hookup and run whatever the hell you want as long as the sniffer likes it.
Joined: Jul 2002
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From: NOR CAL USA
Car: 89 iroc-z 5.7tpi 350,
Engine: 5.7tpi 350,
Transmission: T-56
depending upon the tech he will do a functional they are supposed to in california it consists of a 3 part smog test functional visual and emissions,
things they test, egr valve, timing, idle within spec, mil check engine light, among a few other things,
things they test, egr valve, timing, idle within spec, mil check engine light, among a few other things,
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From: Antelope, CA
Car: 89 IrocZ/17 LS 1LE
Engine: 383/LGX
Transmission: 400/TR-3160
Axle/Gears: 3.08/3.27
Originally posted by porkyzilla
depending upon the tech he will do a functional they are supposed to in california it consists of a 3 part smog test functional visual and emissions,
things they test, egr valve, timing, idle within spec, mil check engine light, among a few other things,
depending upon the tech he will do a functional they are supposed to in california it consists of a 3 part smog test functional visual and emissions,
things they test, egr valve, timing, idle within spec, mil check engine light, among a few other things,

he like most was being lazy when I go to get my car smog'd the tech never opens the hood he just checks the gas cap and put's it on the rollers.
i have seen some clever tricks, a tip if you try to fool smog guys, make it look as stock as possible, any signs of tampering tips techs off and they we'll actually look harder to see if lines have been plugged etc, thinking its an undercover car from the b.a.r.
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i would use a high Temp Epoxy or RTV 