EGR bypass
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Supreme Member
Joined: Jul 2000
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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..............
i think i am also going to try a TB bypass..............
Originally posted by CaliCamaroRS
You'll fail smog, your cylinder temps will be higher and you probably won't see any gains at all..........
You'll fail smog, your cylinder temps will be higher and you probably won't see any gains at all..........
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.
Thread Starter
Supreme Member
Joined: Jul 2000
Posts: 4,541
Likes: 2
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..........
You'll fail smog, your cylinder temps will be higher and you probably won't see any gains at all..........
Supreme Member
Joined: Mar 2000
Posts: 13,414
Likes: 6
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.
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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