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#1
08-26-2005, 01:16 PM
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Normal Vac at idle
Ok got a question, what is the normal amount of Vac. i should see at idel (800-1k)
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   95 GST 5 Speed Cone Open airfilter Custom 3" Turbo Intake UICP/LICP 1g BOV JoeP MBC @ 16psi 2.5 Turbo back 16g 550cc injectors S-AFCII PocketLogger 95 GST 
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#2
08-26-2005, 01:42 PM
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Re: Normal Vac at idle
17-19hg
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#3
08-26-2005, 01:49 PM
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Re: Normal Vac at idle
Depends on what the elevation is where you live. @ sea-level it should be 14-15. I see about 12 at idel because I'm 1780 above sea-level. I see 15 when I let off the gas while crusing.
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DSM geek
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#4
08-26-2005, 02:03 PM
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Re: Normal Vac at idle
I get 18 in/hg @ idle and about 22 - 23 in/hg during deceleration.
Scottse, your's seems a little low, are you sure you don't have a vacuum leak?
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 1997 Spyder GS-T 5-Speed EVO III 16g, DSMLink, Walboro 190 lph Fuel Pump, FIC 650cc injectors, CoolingMist 150psi Methanol Injection, Greddy EVO 2 Cat Back, 2.5" Extreme DP, 2.5" Extreme Hi-Flow Cat, Injen intake, HyperDrive C1 Street Disk & PP, HyperDrive Lightweight Flywheel, 1g BOV, RRE UICP, Home Depot MBC, AEM UEGO WBO2, Brembo Slotted rotors, Akebono Ceramic Pads
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#5
08-26-2005, 02:16 PM
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Re: Normal Vac at idle
Not sure in the slightest. I always figured Vac reflected Appsolute pressure. Im starting to second guess now. Durring Idel their is no possitive pressure, so the engine is running on air pressure to get air through the valves & into the cylinder durring overlap. Am i missing somthing? I know that exhaust gas causes a small draft like effect helping air into the cylinder. I didn't think it helped anywhere near that much! Humm. Crap. Another problem!
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DSM geek
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#6
08-26-2005, 02:25 PM
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Re: Normal Vac at idle
Yeah scotsee, that's a little to low for vacuum.
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#7
08-26-2005, 05:17 PM
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Re: Normal Vac at idle
i live in louisiana and im getting 10-13 at 1k idle and decel is like 18-19
__________________
95 GST 5 Speed Cone Open airfilter Custom 3" Turbo Intake UICP/LICP 1g BOV JoeP MBC @ 16psi 2.5 Turbo back 16g 550cc injectors S-AFCII PocketLogger 95 GST
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#8
08-26-2005, 07:27 PM
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Re: Normal Vac at idle
with 3" turbo back, i get like 21 at idol and decel is 30 or so...im in VA tho
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95 Eclipse GS-T 6 bolt built block - shooting for 450 hp..very doable Currently: A lot, check progression thread - updated 3/27/10 Estimated completion date: Soon lol
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#9
08-26-2005, 09:10 PM
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Re: Normal Vac at idle
ok well fixed a few leaks. one big leak. Thought i had it whooped. Started car, still only reads 10-12 vac at idle and 19 at decel. I dont know peps.
__________________
95 GST 5 Speed Cone Open airfilter Custom 3" Turbo Intake UICP/LICP 1g BOV JoeP MBC @ 16psi 2.5 Turbo back 16g 550cc injectors S-AFCII PocketLogger 95 GST
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#10
08-26-2005, 09:21 PM
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Re: Normal Vac at idle
ok one more thing. i pressured my system to 10psi,on my joe p boost controler, you know the little hole in the controller itself, well it was leaking from there. but when i run it, it boost up to 14psi, should it be leaking at that point or what. just a question, not quit sure.
__________________
95 GST 5 Speed Cone Open airfilter Custom 3" Turbo Intake UICP/LICP 1g BOV JoeP MBC @ 16psi 2.5 Turbo back 16g 550cc injectors S-AFCII PocketLogger 95 GST
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#11
08-27-2005, 06:33 AM
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Re: Normal Vac at idle
In my very limited experience with these cars, normal vacuum on stock cams is 19-22", with 264s its 14-15", and with 272s its 10-12", IIRC.
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Kevin Jewer RWD Talon - 7.92 at 180 Mightymax - 10.7 at 125
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#12
08-27-2005, 08:46 AM
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Re: Normal Vac at idle
well wtf, i nknow i still have stock cams. i dont know why its only doing 10-12vac any ideas?
__________________
95 GST 5 Speed Cone Open airfilter Custom 3" Turbo Intake UICP/LICP 1g BOV JoeP MBC @ 16psi 2.5 Turbo back 16g 550cc injectors S-AFCII PocketLogger 95 GST
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#13
08-27-2005, 09:56 AM
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Re: Normal Vac at idle
could the gauge be messed up at reading vac, what about that hole in the Joe P boost controller? this SUCKS
__________________
95 GST 5 Speed Cone Open airfilter Custom 3" Turbo Intake UICP/LICP 1g BOV JoeP MBC @ 16psi 2.5 Turbo back 16g 550cc injectors S-AFCII PocketLogger 95 GST
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#14
08-28-2005, 03:06 AM
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Re: Normal Vac at idle
Could be vac leak after the throttle body, leak to the guage, or a shite guage. Then you get into the complicated things like timing off a tooth, etc .
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Kevin Jewer RWD Talon - 7.92 at 180 Mightymax - 10.7 at 125
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#15
08-28-2005, 08:42 AM
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Re: Normal Vac at idle
im also having misfires, wouldnt that be cause by timing off a tooth?
__________________
95 GST 5 Speed Cone Open airfilter Custom 3" Turbo Intake UICP/LICP 1g BOV JoeP MBC @ 16psi 2.5 Turbo back 16g 550cc injectors S-AFCII PocketLogger 95 GST
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