V6 Discussion and questions about the base carbureted or MPFI V6's and the rare SFI Turbo V6.

EGR bypass

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Old May 1, 2002 | 08:11 PM
  #1  
1991tealRSt-topGuy's Avatar
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Car: 1991 Corvette Coupe
Engine: L98
Transmission: 700R4/4L60 same trans different name
EGR bypass

i was talking with a kid in work today and he said if i was to bypass my EGR i would pick up a few extra ponies.........has anyone here done that.....did they feel a difference?

i think i am also going to try a TB bypass..............
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Old May 1, 2002 | 09:17 PM
  #2  
Xenodrgn's Avatar
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From: Bayville NJ and Newark at NJIT.
Niether is worth it.
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Old May 1, 2002 | 09:40 PM
  #3  
CaliCamaroRS's Avatar
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From: Los Angeles, CA
Engine: LH0 3.1L
You'll fail smog, your cylinder temps will be higher and you probably won't see any gains at all..........
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Old May 1, 2002 | 09:56 PM
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WaynesRS's Avatar
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From: Baton Rouge ,Louisiana ,USA
Originally posted by CaliCamaroRS
You'll fail smog, your cylinder temps will be higher and you probably won't see any gains at all..........
I've heard the same thing . I've also heard of people burning holes in their pistons due to combustion chambers which are to hot ! As much as I hate my EGR valve , I wont take it off ! ....I have even burned up all three boots already on my new accel wires which are only 4 months old . I even have heatshields on the #1 and #3 plugs and it still burned them ! all because that damn EGR valve heat ! One of my heat shields which is a Taylor , and only 2 weeks old is about to fall apart from the heat !

Last edited by WaynesRS; May 1, 2002 at 09:58 PM.
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Old May 2, 2002 | 05:08 AM
  #5  
1991tealRSt-topGuy's Avatar
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Car: 1991 Corvette Coupe
Engine: L98
Transmission: 700R4/4L60 same trans different name
Originally posted by CaliCamaroRS
You'll fail smog, your cylinder temps will be higher and you probably won't see any gains at all..........
thats what i thought..........but some people insist that it helps..........but......going by the logics of it.....i dont think i would help
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Old May 2, 2002 | 09:42 AM
  #6  
TomP's Avatar
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From: Central NJ, USA
Car: 1986 Firebird
Engine: 2.8 V6
Transmission: 700R4
Everyone's correct, and here's why.

The EGR doesn't kick in unless the following conditions are present:

1. Engine warmed up and in closed loop mode (reading the oxy sensor)
2. Vehicle speed is high
3. Engine idle speed is low

Now, if you had high vehicle speed and low engine speed, that means you're just cruising on a highway, and not racing anyone. If you were even to get extra HP by blocking EGR off, you certainly wouldn't feel it! The second you race someone, the engine rpm's shoot way up, and EGR disengages.

Older motors might've worked differently, since there was no computer, but on our 85-up MPFI motors, unhooking/bypassing a properly functioning EGR won't help at all. For us, it's like a "free emissions mod"- doesn't hurt at all, and does some good for the little bunny rabbits and bambis and trees.
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