EGR 89GT bypass [tru cold air]

Post information about intake systems. Either purchased or custom made
User avatar
wicked-irocz
Registered User
Posts: 1028
Joined: Thu Feb 20, 2003 11:21 pm
Location: South Central MN

Re: EGR 89GT bypass [tru cold air]

Postby wicked-irocz » Wed May 13, 2009 11:12 pm

I'd hook it back up Andy. It isn't going to harm anything and I know the EGR does effect the 02 so if you hook it up and reset the computer my guess is it would be fine.


94 Beretta Z26 57,4xx miles
3100, auto, crank windows, power locks/trunk, A/C,
To many mods to list
-intercooler :shock:

Among beretta boards
1st Turbo 4t60-e
1st Turbo 3100
1st Turbo Z26
1st 94+ Turbo

User avatar
Asylum
Registered User
Posts: 3022
Joined: Wed Mar 31, 2004 9:36 am
Location: Hamilton, Ontario, Canada
Has thanked: 5 times
Been thanked: 3 times
Contact:

Re: EGR 89GT bypass [tru cold air]

Postby Asylum » Thu May 14, 2009 11:50 am

You should hook the EGR back up.

There is no performance gain or any cooler air to be had. (This from a guy who has a specially modified 3500 UIM with the EGR welded shut, but I didn't do it, and wouldn't have.)

Also, bypassing the coolant lines to the TB is just a waste of time. The air passes there so quickly there is no way it could affect the temperature at all.

They are simply there to keep the throttle blade from potentially icing up.


Eric

Asylum Motorsports
"Where we're not happy 'til YOU'RE not happy!






'91 California Quad
'92 3500 GT gone and not really missed. It was fun. Documented 13.47 N/A.

User avatar
3X00-Modified
Administrator
Posts: 10672
Joined: Thu Jul 05, 2007 9:18 am
Location: Plainfield CT
Has thanked: 12 times
Been thanked: 46 times

Re: EGR 89GT bypass [tru cold air]

Postby 3X00-Modified » Thu May 14, 2009 12:37 pm

My TB has no ports, and my egr is fully hooked up ;)



User avatar
Asylum
Registered User
Posts: 3022
Joined: Wed Mar 31, 2004 9:36 am
Location: Hamilton, Ontario, Canada
Has thanked: 5 times
Been thanked: 3 times
Contact:

Re: EGR 89GT bypass [tru cold air]

Postby Asylum » Thu May 14, 2009 6:04 pm

3X00-Modified wrote:My TB has no ports, and my egr is fully hooked up ;)


There is a port on the TB adapter isn't there? Or do you have an adapter?

There is on mine. I run the FPR and Cruise/HVAC vacuum from there.


Eric

Asylum Motorsports
"Where we're not happy 'til YOU'RE not happy!






'91 California Quad
'92 3500 GT gone and not really missed. It was fun. Documented 13.47 N/A.

User avatar
3X00-Modified
Administrator
Posts: 10672
Joined: Thu Jul 05, 2007 9:18 am
Location: Plainfield CT
Has thanked: 12 times
Been thanked: 46 times

Re: EGR 89GT bypass [tru cold air]

Postby 3X00-Modified » Thu May 14, 2009 6:21 pm

I have a NOS fogger in my throttle body spacer... and I get my VAC from the factory 3500 IAC port I think it is..



User avatar
yellow3800
Registered User
Posts: 255
Joined: Tue Jan 15, 2002 10:00 am
Location: Maryville, TN
Been thanked: 1 time
Contact:

Re: EGR 89GT bypass [tru cold air]

Postby yellow3800 » Sun May 17, 2009 12:51 pm

yes, this 1989GT DID have the coolant line "turning around" at the base of the throttle body - it has been disconnected. I say turning around because it does not contain jackets to route coolant around the intake tube/body - its used as a fitting more or less to route the coolant line out the opposite direction of it coming in... either way, its disconnected.


Disconnecting the EGR does nothing for performance?
well, I noticed with it hooked up, no engine codes, I get 27mpg. I drive 30miles to work at 50mph... one way. about 12 tanks of gas show this.

With it disconnected, and getting the code 13 and 44 intermittently [due to hot exhaust temp?] I am getting 34mpg. .. this is only from the first two tanks of gas running like this. The car does not surge when the light comes on... throwing it into open loop mode for O2 inop. huh.

So have others done this EGR bypass to find out that there is no engine code? I just find it hard to believe when I hook up the vac line to the egr valve I don't get the code 13. When I block the egr vac line, I get 13 and 44, intermittently through driving. Its annoying, but I'd like to keep it bypassed.

Has anyone else bypassed a vacuum-style EGR?
andy



User avatar
yellow3800
Registered User
Posts: 255
Joined: Tue Jan 15, 2002 10:00 am
Location: Maryville, TN
Been thanked: 1 time
Contact:

Re: EGR 89GT bypass [tru cold air]

Postby yellow3800 » Sun May 17, 2009 12:55 pm

Oh, and I bypassed the coolant line to TB for maintenance #1 reason... I had to recondition fuel injectors and that line was an unnecessary pain... so it helps when pulling the plenum off.

8)



User avatar
IsaacHayes
Registered User
Posts: 975
Joined: Fri Oct 07, 2005 8:32 pm
Location: Missouri

Re: EGR 89GT bypass [tru cold air]

Postby IsaacHayes » Sun May 17, 2009 8:34 pm

Hmm. What ECM you running? I take it you have a 3800 in there? What year?

Jon, the port on the 3500 is evap solenoid there. The IAC function is built into the drive-by-wire TB.


Image Image 2010 project (click pic)
1994 3100 BERETTA. 200,000+ miles.
16.0 @ 84.41mph when stock. Now ???
Original L82 w/LA1, LX9, & LX5 parts!!!

soon to be OBD1 tuned...

User avatar
yellow3800
Registered User
Posts: 255
Joined: Tue Jan 15, 2002 10:00 am
Location: Maryville, TN
Been thanked: 1 time
Contact:

Re: EGR 89GT bypass [tru cold air]

Postby yellow3800 » Mon May 18, 2009 11:02 am

no no, the 3.8 lemon is fine [though its digital egr valve needs bypassing now that I think of it - but thats a separate case]

- this 89gt is a different car

stock ecu, call it a stock intake for now too. I just want to know how to get this engine light off, and if why its being set

[ the question is if the egr valve is bypassed by plugging the vacuum line at the intake after unplugging the egr vac line, will the rise in exhaust temperature throw the oxy sensor reading off the computer map and set a code 13?]

surely someone out there has done this already so I don't need to re-invent the wheel



User avatar
Money pit Beretta
Registered User
Posts: 6362
Joined: Thu Jul 26, 2007 11:36 am
Location: Kansas
Has thanked: 2 times
Been thanked: 9 times

Re: EGR 89GT bypass [tru cold air]

Postby Money pit Beretta » Mon May 18, 2009 10:43 pm

I thought that line was for the heater. Does your heater still work?


keep'em flying!


Return to “Intakes”

Who is online

Users browsing this forum: No registered users and 2 guests