Flapper valve

f00g00 · 11-07-2006, 11:37 AM

For the NA people, does anyone know how to control what RPM the valve on the Y pipe opens? Mine is opening around 4200 rpm which if I remember correctly it should be about 1000 less than that.

mrnickleye · 11-09-2006, 05:58 AM

My '89 opens at about 4k, also. I researched the hell out of that AICS last year. 4k is the correct #. Always looking for cheap torque, I experimented with it by applying vacuum at different RPMs to see if it made any differences in HPs. None noticed, so I put it back to factory condition.

damdog05 · 11-09-2006, 11:39 PM

mine also opens right before 4k. at about 3700-3800. looks like its about normal.

h8z2luze · 11-11-2006, 01:36 AM

How do you figure that out???

11-07-2006, 11:37 AM	#1
f00g00 12psi boost Join Date: Aug 2005 Location: Kuwait Posts: 292	Flapper valve For the NA people, does anyone know how to control what RPM the valve on the Y pipe opens? Mine is opening around 4200 rpm which if I remember correctly it should be about 1000 less than that.

11-09-2006, 05:58 AM	#2
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	My '89 opens at about 4k, also. I researched the hell out of that AICS last year. 4k is the correct #. Always looking for cheap torque, I experimented with it by applying vacuum at different RPMs to see if it made any differences in HPs. None noticed, so I put it back to factory condition. __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

11-09-2006, 11:39 PM	#3
damdog05 12psi boost Join Date: Apr 2006 Location: Georgia Posts: 250	mine also opens right before 4k. at about 3700-3800. looks like its about normal. __________________ My cars: 85 Trans Am- Ehhh- Gone 83 Rx7- Much Better- Gone 86.5 Supra- Love- Not Gone

11-11-2006, 01:36 AM	#4
h8z2luze 12psi boost Join Date: May 2006 Location: Nor*Cal Posts: 338	How do you figure that out??? __________________ 1989 Supra 7MGE MK3 5-speed project... http://www.cardomain.com/ride/2385505

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