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Hunty Forums Junkie Location: Adelaide Registered: July 2002	Re: Disabling TVIS Wed, 31 August 2005 02:49 http://www.mrcontrols.com/primers/power.htm on that site there is a section on how to change the tvis opening point using a rpm module thingy majiggy. seems like thats the way to do it. Excert from site The intake manifold and TVIS were designed to provide good low end torque and high top end flow using a dual runner per port setup with a set of butterfly valves kept closed at low RPMs to increase air velocity into the port and open at higher RPMs to increase flow capacity. The proper TVIS opening point lowers as VE improves (better exhaust, turbo, valves or cams). The ECU keeps a fixed opening point around 4200RPMs which is too high for modified engines. Consequently, there will be a torque dip from around 3800 RPMs to 4200 RPMs. The ECU also uses the TVIS to reduce engine VE if it has detected knock in the recent past. This can cause variations in performance for no apparent reason. The TVIS be kept functional as long as you continue to use the stock intake manifold but you should control the TVIS with an MSD RPM switch. You will need to purchase an MSD 8950 along with an appropriate RPM module, which is going to be included in wither the MSD 8743 (for even 100 RPMs) or MSD 87431 (for odd 100 RPMs) opening points. Alternatively, you can make your own fully adjustable RPM module. Most modified 3S-GTEs will need to open the TVIS between 3600 and 3900 RPMs. The only way to know for sure is to do a dyno pull to 4500RPMs with the TVIS open and another one with the TVIS closed keeping everything else the same. Then, the point at which the two torque curves cross is your best opening point. The best place to install the MSD 8950 switch is in the engine bay near the igniter/coil. Cut the red and blue loops on the switch since you are going to run on a 4-cylinder engine. Ground the black wire to any bolt that goes into the chassis. With the ignition key off, pull the 2 pin connector from the coil and splice the red wire of the switch to the black wire with a red stripe. Splice the white wire of the switch to the black wire with a white stripe. I recommend using good solder or crimp connections to do this. Plug the connector back into the coil. Now go under the intake manifold and locate the TVIS valve. This valve has one vacuum hose going to the TVIS actuator, another vacuum hose going to a blue/purple canister mounted under the intake manifold and a 2-pin electrical connector. Disconnect the connector and cut the green wire with a black stripe about two inches from the connector. Cover the end of this wire from the engine harness with electrical tape. Connect the other end of this wire going to the connector to the gray wire from the MSD 8950. Use a pair of spade connectors so that you can easily set the car back to stock or control the TVIS by hand to help you find the switch point at the dyno. Reconnect the connector For the interim, install a 3800 or 3700 RPM module in the switch. Now you just need to find the best switch point at the dyno as explained above. To keep the TVIS open, you can disconnect the gray wire from the TVIS control valve and leave it hanging in air. To close the TVIS, ground the wire going to the TVIS valve. If you notice no difference, your TVIS system is not working properly and you must follow the directions in the BGB on how to diagnose it. Cheers [Updated on: Wed, 31 August 2005 02:51] [Report message to a moderator]

	Subject	Poster	Date
	Disabling TVIS	Roundy	Sat, 27 August 2005 13:48
	Re: Disabling TVIS	feral4mr2	Sat, 27 August 2005 22:01
	Re: Disabling TVIS	GTtwin	Mon, 29 August 2005 07:17
	Re: Disabling TVIS	berad	Mon, 29 August 2005 07:28
	Re: Disabling TVIS	justcallmefrank	Mon, 29 August 2005 07:42
	Re: Disabling TVIS	-==L=a=N=c=E==-	Mon, 29 August 2005 07:50
	Re: Disabling TVIS	justcallmefrank	Mon, 29 August 2005 07:57
	Re: Disabling TVIS	Roundy	Mon, 29 August 2005 23:04
	Re: Disabling TVIS	GTtwin	Tue, 30 August 2005 03:07
	Re: Disabling TVIS	SilverGhost	Tue, 30 August 2005 09:19
	Re: Disabling TVIS	Roundy	Tue, 30 August 2005 03:40
	Re: Disabling TVIS	quest	Tue, 30 August 2005 08:27
	Re: Disabling TVIS	GTtwin	Tue, 30 August 2005 09:18
	Re: Disabling TVIS	VeeP	Tue, 30 August 2005 14:17
	Re: Disabling TVIS	justcallmefrank	Tue, 30 August 2005 22:25
	Re: Disabling TVIS	VeeP	Wed, 31 August 2005 02:35
	Re: Disabling TVIS	justcallmefrank	Wed, 31 August 2005 02:42
	Re: Disabling TVIS	Hunty	Wed, 31 August 2005 02:49

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