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Username Post: Throttle body plenum        (Topic#183324)
gchemist 
Senior Chevytalk Moderator
Posts: 24963
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
02-27-08 06:34 PM - Post#1376324    

Since I am replacing the intake gasket, why not make some modifacations along the way. The entire intake was off anyway.


I decidce to remove the air restrictor on the intake plenum.


Hacksaw did a very good job.

If you do this mod, don't grind out the rivets!! If you do, your engine will idle high.

Now, I have to finish the rest of the coolant system so I can start it and drive it!

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 




BrianEsser 
BANNED
Posts: 7383

Age: 43
Loc: North Star, Ohio
Reg: 06-30-01
02-27-08 09:41 PM - Post#1376425    
    In response to gchemist

Is that a restrictor or is it meant to help cut turbulence into the plenum?



 
gchemist 
Senior Chevytalk Moderator
Posts: 24963
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
02-28-08 04:34 PM - Post#1376914    
    In response to BrianEsser

No idea. It does restrict flow into the intake. I think it's supposed to push more air through the other side. The backside being near the middle of the intake. I'll soon know how it works.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
malibu101 
Very Senior Member
Posts: 1756

Age: 52
Loc: Walnutport PA
Reg: 11-20-00
02-29-08 08:50 AM - Post#1377376    
    In response to gchemist

I can't wait to see what you think!
I have looked at those many times, reason I've looked at them many times is you know those engines are famous for intake gasket leaks.
I've often wondered why it's there and what effect there would be from what you have done.
Thanks for being a leader!



 
gchemist 
Senior Chevytalk Moderator
Posts: 24963
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
03-02-08 05:39 AM - Post#1378543    
    In response to malibu101

I like the plenum mod!! No more stumble off idle. I can feel a nice torque change. The oversized 255/60R17 (29") tires felt a little heavy right off idle. Now they don't feel like it. The engine has a nice smooth RPM change from idle to WOT. I did clean the MAF, TB an intake too. So a combination of everything works great. I need to drive a few hundred miles and see if anything changes. The computer has to relearn everthing since I disconnected power to it.

I'll report any MPG difference or if anything else changes.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


Edited by gchemist on 03-02-08 05:40 AM. Reason for edit: No reason given.

 
malibu101 
Very Senior Member
Posts: 1756

Age: 52
Loc: Walnutport PA
Reg: 11-20-00
03-25-08 06:39 AM - Post#1396203    
    In response to gchemist

I'm sure you've had a tank or 2 of gas through by now with this modification. What do you think?
Mileage- any better or worse?
All around seat of the pants power- you said low RPM was improved. Any other noticeable differences

Bottom line- Are you glad you did it?
Any regrets?



 
gchemist 
Senior Chevytalk Moderator
Posts: 24963
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
03-25-08 09:23 AM - Post#1396318    
    In response to malibu101

Actually, I've only used 1 tank. I am enjoying driving my ZZ4 powered 83 pickup too much. My lead foot is putting gas in the old truck.

On the first tank, I calculate maybe .25 to 0.5 MPG gallon increase. I need to run more tanks to know for sure. I think the change would be more noticable on a long trip. At highway speeds, the plenum will be open longer.

So far, no regrets. I would do it again.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
malibu101 
Very Senior Member
Posts: 1756

Age: 52
Loc: Walnutport PA
Reg: 11-20-00
03-25-08 09:49 AM - Post#1396341    
    In response to gchemist

  • gchemist Said:

So far, no regrets. I would do it again.



Thanks for your thoughts on this!




 




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