VTEC on/off switch
OM NOM NOM E30
Joined: Nov 2002
Posts: 5,001
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From: Portsmouth
ok you have a b17a swap is it a b17 tranny or like a b16 cable tranny?
I just have a LS integra and my rpms are pretty high too for highway driving. 80 is like 4k
whats stock xover for vtec on the b17 i cant remember :\ i thought 5200
I just have a LS integra and my rpms are pretty high too for highway driving. 80 is like 4k
whats stock xover for vtec on the b17 i cant remember :\ i thought 5200
Registered Member
Joined: Dec 2002
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alright.. I did a little research on the b17... and its a pretty unique motor, you should really try to find another b17 tranny because of the obvious reason, people have troubles with other trannys revving too high. It would be sweet for an all motor drag car though.. that thing would haul...
Currently N/A
Joined: Feb 2003
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From: Virginia Beach
Originally posted by Fabrik8
If you put in a switch, you shouldn't get a CEL, but it should run like ass. VTEC engagement switches to a different (second) set of maps for fuel, etc., and if you use a switch, you'll still be running on the non-vtec maps, parameters, etc., so you'll probably go quite lean quite fast. You can tell the VTEC solenoid to engage with a switch, it doesn't care, but who knows what the ECU will do to try to compensate. All that intake air may make some funny corrections from the ECU..
The MAP sensor doesn't factor into the decision to engage VTEC or not, only RPM, throttle position, and oil pressure; the ECU just uses the MAP sensor like normal.. A vtec controller is just an RPM activated switch with fuel/spark maps built in to correct when vtec is engaged, the ECU doesn't care. This is why a non-vtec ECU can be used with a vtec controller (on a vtec engine), and the ECU doesn't care. It doesn't know you're engaging vtec when you're not supposed to, because it doesn't know what vtec is..
If you put in a switch, you shouldn't get a CEL, but it should run like ass. VTEC engagement switches to a different (second) set of maps for fuel, etc., and if you use a switch, you'll still be running on the non-vtec maps, parameters, etc., so you'll probably go quite lean quite fast. You can tell the VTEC solenoid to engage with a switch, it doesn't care, but who knows what the ECU will do to try to compensate. All that intake air may make some funny corrections from the ECU..
The MAP sensor doesn't factor into the decision to engage VTEC or not, only RPM, throttle position, and oil pressure; the ECU just uses the MAP sensor like normal.. A vtec controller is just an RPM activated switch with fuel/spark maps built in to correct when vtec is engaged, the ECU doesn't care. This is why a non-vtec ECU can be used with a vtec controller (on a vtec engine), and the ECU doesn't care. It doesn't know you're engaging vtec when you're not supposed to, because it doesn't know what vtec is..
Actually I have to disagree with you first statement. if you put a switch inline with the VTEC selonoid and it's in the off position, and you go past the engagement point in RPM, you will get a CEL. That switch being off doesn't allow the VTEC circuit to ground and the computer will throw a code.
Racetracks
Joined: Nov 2002
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From: How long is a piece of string?
Yes, the driver for the VTEC solenoid will sense that it doesn't engage, I agree.. I'm saying that if if engage VTEC with a switch, not disengage with a switch, you shouldn't get a CEL..
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