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08-03-2009
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#1 |
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Join Date: Nov 2008
Location: Wilson, AR
Posts: 63
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Throttle Body Secondary Valves
At what point to the secondary throttle valves open?
I wish I didn't have to ask this because I know I've seen this information somewhere, but I can't seem to find it... |
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08-03-2009
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#2 |
Join Date: Apr 2006
Location: Ideho
Posts: 2,653
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Re: Throttle Body Secondary Valves
Technically I don't know that answer either. But you should feel them open at around 3000 to 3500 RPM.
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[I][FONT=Comic Sans MS]John Boyd[/FONT][/I] [I][FONT=Comic Sans MS][SIZE=1]Ideho[/SIZE][/FONT][/I] [FONT=Comic Sans MS][SIZE=1][I]2015 ZL1 [/I][I]Camaro #1121 BLACK/BLACK 6 SPD (540 RWHP)[/I][/SIZE][/FONT] [I][FONT=Comic Sans MS][SIZE=1]1991 ZR-1 #458 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK 72[/COLOR]k miles ([B][COLOR=red]SOLD[/COLOR][/B]) 1991 ZR-1 #473 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK [/COLOR]37k miles ([B][COLOR=red]SOLD[/COLOR][/B])[/SIZE][/FONT][/I] |
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08-03-2009
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#3 |
 
Join Date: Jul 2005
Location: Mendota Heights, MN. 55120
Posts: 984
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Re: Throttle Body Secondary Valves
I think it depends on the chip that is installed. Some of the tuners have different ranges for opening.
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Bob Anderson 1990 #2405 White/Gray Haibeck chip,4:09 gears,Power Effects Exhaust,5 spoke chrome,C5 brakes,49th Street rockers,K&N,Hurst,Headers,Upper & lower ported Minnesota State Director Founding Member #19 |
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08-03-2009
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#4 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,708
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Re: Throttle Body Secondary Valves
Depends on the RPM and the TPS% Opening set in the calibration. Not just one answer.
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08-03-2009
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#5 |
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Join Date: May 2009
Location: S Nevada
Posts: 352
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Re: Throttle Body Secondary Valves
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1995 Convertible Supercharged Auto 1974 454 550hp (avatar car) On the blocks- -Scharger install ! 1992-Zr-1 Sold. Watson Headers Ported Plenum, Housings Random tech cats Fidanza Flywheel Chipped, Relocated Mat Woods 165 stat Borlas, Straights 1996 Lt4 Sold 1994 Lt1 Sold 2004 Z06 Sold AKA** Illenema |
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08-03-2009
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#6 |
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Join Date: Nov 2008
Location: Wilson, AR
Posts: 63
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Re: Throttle Body Secondary Valves
Thank you! Figure 7 was exactly what I remembered seeing, I just couldn't remember where.
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08-04-2009
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#7 |
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Join Date: May 2009
Location: S Nevada
Posts: 352
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Re: Throttle Body Secondary Valves
I wanted to see for myself when the big plates start to open so I pulled the intake hose so I could see right down the airhorn, put a mirror there so i could watch from the drivers position when i stepped on the gas.
The big plates crack open at about 15% throttle and go from there. So they open VERY quickey.
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1995 Convertible Supercharged Auto 1974 454 550hp (avatar car) On the blocks- -Scharger install ! 1992-Zr-1 Sold. Watson Headers Ported Plenum, Housings Random tech cats Fidanza Flywheel Chipped, Relocated Mat Woods 165 stat Borlas, Straights 1996 Lt4 Sold 1994 Lt1 Sold 2004 Z06 Sold AKA** Illenema |
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08-04-2009
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#8 | |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,708
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Re: Throttle Body Secondary Valves
Quote:
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08-04-2009
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#9 |
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Join Date: Nov 2008
Location: Wilson, AR
Posts: 63
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Re: Throttle Body Secondary Valves
Yeah, I didn't mean injector secondaries. I meant the larger valves on the throttle body. Mine seem to take a long time to open... I'm wondering if this could cause my hesitation...
Kb7tif, are you talking about the throttle body? |
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08-04-2009
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#10 | |
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Join Date: May 2009
Location: S Nevada
Posts: 352
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Re: Throttle Body Secondary Valves
Quote:
Another thing you can check is that are the plates on xfire is talking about, as just because the vacuum system is working and all does not mean that all 8 plates are opening. the Seconadry throttle linkage on these are somewhat flimsey and can break off. On My car only 1 of 4 were opening on one side. To check this there is a wire on he c connector of the pcm you ground out 9I think its a purple one) and open the secondairy system with engine off. Mark H's site expains this in detail on what wire and what connector. The secondairy linkage is under the aluminum covers on each side. Kurt Has them. (thank god). Its not worth pulling the plenum just for this but next time its off be worth a few minutes to check.  Marc H has a throttle body service he provides which he will check everything, this cures high idle is some cases and provides peace of mind. he can check if everything is aok. 165$ 3 day turn around send it in.
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1995 Convertible Supercharged Auto 1974 454 550hp (avatar car) On the blocks- -Scharger install ! 1992-Zr-1 Sold. Watson Headers Ported Plenum, Housings Random tech cats Fidanza Flywheel Chipped, Relocated Mat Woods 165 stat Borlas, Straights 1996 Lt4 Sold 1994 Lt1 Sold 2004 Z06 Sold AKA** Illenema Last edited by Kb7tif; 08-04-2009 at 02:54 PM. |
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