what should VTEC engage at opinion's???

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Feb 28, 2006 | 07:59 AM

#11 (permalink)

VOD

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i got mine set 5100...untuned...w/o vafc stock is 5500...it gives it a lil more time b4 u need to shift...my question is how far into the red b4 it dangerous..

Feb 28, 2006 | 09:41 AM

#12 (permalink)

FC_V8

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DEPENDS WHAT SET UP YOU GOING WITH... thats what i think..

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Feb 28, 2006 | 09:55 AM

#13 (permalink)

mtber

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Quote:

Originally Posted by kender

the 1992-1995 Honda Civic EX/Si / del Sol Si with p28 is 4500.

That is incorrect, vtec engagement on a stock p28 is 5500 rpms on most rom versions I have seen.

Quote:

Originally Posted by RyanCivic2000

Do two dynos. One on the low cam, one on the high cam, set VTEC where the hp curves cross. This is optimal.

This is incorrect also :-/

Quote:

Originally Posted by 99B16Si

every car is different. with minor bolt ons, the factory engagement should be fine

Yay, good information....

Quote:

Originally Posted by VtecMaster

just wondering what do you guys think is the best RPM's for VTAK to engage at????

i have mines set at 4'9, 5 ish

You would get a better response if you supplied us with a complete spec sheet on your vehicle's setup.

A lot of people have the misconception that the earlier vtec engages, the more power you will have. This theory exists because people hear vtec engage & think they are making more power. The truth is vtec should be engaged at the best possible location for the power band so that the power transition between lowcam & high cam is almost un-noticed.

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Feb 28, 2006 | 10:27 AM

#14 (permalink)

Cronic

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John to save the thread! woot!

If you don't have cam(s) or any other major modification to the engine itself (turbo not withstanding) don't touch the VTEC engagment point. It's at the optimal setting already.

Feb 28, 2006 | 10:29 AM

#15 (permalink)

RyanCivic2000

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Quote:

Originally Posted by mtber

This is incorrect also :-/

Why wouldn't you want the switch-over to the VTEC cam to be where the low cam quits making more power?

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Feb 28, 2006 | 10:33 AM

#16 (permalink)

Cold_Beer

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Quote:

Originally Posted by RyanCivic2000

Why wouldn't you want the switch-over to the VTEC cam to be where the low cam quits making more power?

because then it wont make as much power up top. And you will get that nasty vtec drop when it goes into vtec.

It depends on the car , when vtec should engage. Every motor is different.

Feb 28, 2006 | 10:40 AM

#17 (permalink)

RyanCivic2000

Fuck the DOHC

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Why would you get a nasty drop? It should give you a smooth transition.

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Feb 28, 2006 | 10:40 AM

#18 (permalink)

kender

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Quote:

Originally Posted by mtber

That is incorrect, vtec engagement on a stock p28 is 5500 rpms on most rom versions I have seen.

Normally I would agree with you but if my info is correct then the website in your sig is incorrect.

http://www.phearable.net/tech/wiring/ecus.html I copied straight from this page.

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Feb 28, 2006 | 11:16 AM

#19 (permalink)

Old Renegade

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most people think the quicker they get into vtec the more faster they will go. wrong! you should have your car tuned to see where vtec most smoothly transitions from low cam to hi cam. if your car is stock the or has minor bolt ons the stock engagement point should be fine. as stated if vtec comes in too early you will hear it engage but wii have a terrible power drop then will go back up in power. so if stock or with minor bolt ons the factory setting will be fine. if heavily modded have it dyno tuned. stock pr3 ecu has vtec swicth over point at 4800 rpms (obd0 ecu).

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Feb 28, 2006 | 11:35 AM

#20 (permalink)

mtber

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Quote:

Originally Posted by kender

Normally I would agree with you but if my info is correct then the website in your sig is incorrect.

http://www.phearable.net/tech/wiring/ecus.html I copied straight from this page.

The page is incorrect, I didn't write the chart I simply put it up for ecu code reference. I will fix the mis-print.

Thanks,
John Vega - Phearable.net

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