Need Help! Vtec Engagement!

DMC_S2000 · 01-17-2007, 04:57 AM

(How can I lower my ap2's vtec engagement by about 5200 rpm? and if vtec engagement is lowered...will it have a negative effect or something to the engine?).....sorry...the question I said up there was not really I wanted to say...I want to say is how to lower vtec engagement TO(not by) 5200 rpm...and if is there going to be any negative effect or something to the engine?

gomarlins3 · 01-17-2007, 06:26 AM

You can use a VAFC or a piggyback ECU. Lowering your VTEC point some isn't a bad thing per say, but going to low isn't going to make you a whole lot faster. Going to low may put you in VTEC during normal cruising on the freeway and that will lower fuel milage considerably.

I hope that is a typo saying that you want to lower your VTEC point by 5200 rpm's VS. lowering it to 5200 RPM's. Lowering it to 5200 could possibly be done, but I think that's a little low. Lowering it BY 5200 would be nuts and I doubt it could be done.

bjurasz · 01-17-2007, 12:00 PM

I'll admit I'd like to see a lower RPM engagement for the cam timing change as well. Its just too close to where your revs drop during a gear change. If you are not right on redline when you shift you'll momentarily drop off the cam, which is a bit violent. To me the VTEC range is too narrow. This probably can be done with a ECU change. The question is whether it is beneficial. Advancing a camshaft too much at too low an RPM is a recipe for reduced power.

bobby2002S2K · 01-17-2007, 05:43 PM

I'm with gomarlins the VAFC is what i would go with its not to hard to wire up but dont try to tune it yourself leave it the way it is until you can get to a dyno to get it done or you could really get in to a mess.Also i think 5200 would be pretty rad of a change wouldnt recommend more that 500 RPM change. But i'm sure if you get one the guys at a good "mustang" dyno could help you out with that alot better.

JdMs2k · 01-31-2007, 08:06 PM

vtec controller....it lets you decide when you want the vtec to kick in..and no negative effects to it at all...except when your just cruising and the vtec kicks in and all of a sudden you get un wanted boost...but if ya get the right vtec controller itll have diff. settings where you can just press a button and itll change to a more stock rpm. for vtec to kick in.

01-17-2007, 04:57 AM	#1 (permalink)
DMC_S2000 Member Join Date: Jun 2006 Posts: 37	Need Help! Vtec Engagement! (How can I lower my ap2's vtec engagement by about 5200 rpm? and if vtec engagement is lowered...will it have a negative effect or something to the engine?).....sorry...the question I said up there was not really I wanted to say...I want to say is how to lower vtec engagement TO(not by) 5200 rpm...and if is there going to be any negative effect or something to the engine?

01-17-2007, 06:26 AM	#2 (permalink)
gomarlins3 "Enjoy the drive" Join Date: Jul 2005 Location: Kuna Idaho Posts: 2,644	You can use a VAFC or a piggyback ECU. Lowering your VTEC point some isn't a bad thing per say, but going to low isn't going to make you a whole lot faster. Going to low may put you in VTEC during normal cruising on the freeway and that will lower fuel milage considerably. I hope that is a typo saying that you want to lower your VTEC point by 5200 rpm's VS. lowering it to 5200 RPM's. Lowering it to 5200 could possibly be done, but I think that's a little low. Lowering it BY 5200 would be nuts and I doubt it could be done. __________________ Yablownowitz Racing brought to you by Anytime Fitness. Happiness is a nice road, great weather, and driving the S with Sue in the seat next to me. "Whatever you do, where ever you go, enjoy the drive." I know for a FACT that the last year of production of the S2000 is 2003!!!!! After that, it will be the S2200 under an assumed name.

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01-17-2007, 12:00 PM	#3 (permalink)
bjurasz Senior Member Join Date: Sep 2006 Posts: 132	I'll admit I'd like to see a lower RPM engagement for the cam timing change as well. Its just too close to where your revs drop during a gear change. If you are not right on redline when you shift you'll momentarily drop off the cam, which is a bit violent. To me the VTEC range is too narrow. This probably can be done with a ECU change. The question is whether it is beneficial. Advancing a camshaft too much at too low an RPM is a recipe for reduced power.

01-17-2007, 05:43 PM	#4 (permalink)
bobby2002S2K Wisdom begins in wonder. Join Date: Dec 2006 Location: Lorton,VA Posts: 574	I'm with gomarlins the VAFC is what i would go with its not to hard to wire up but dont try to tune it yourself leave it the way it is until you can get to a dyno to get it done or you could really get in to a mess.Also i think 5200 would be pretty rad of a change wouldnt recommend more that 500 RPM change. But i'm sure if you get one the guys at a good "mustang" dyno could help you out with that alot better.

01-31-2007, 08:06 PM	#5 (permalink)
JdMs2k Junior Member Join Date: Jan 2007 Posts: 8	vtec controller....it lets you decide when you want the vtec to kick in..and no negative effects to it at all...except when your just cruising and the vtec kicks in and all of a sudden you get un wanted boost...but if ya get the right vtec controller itll have diff. settings where you can just press a button and itll change to a more stock rpm. for vtec to kick in.