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Apexi v-Afc vtec controller

 
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Old 05-30-2010, 03:35 PM
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Apexi v-Afc vtec controller

Hi,

I recently bought a 99 Honda Prelude SH and it came with a V-tech controller. The thing is I dont understand how it works so I did not know how it was set for the car. After messing around with it for a while I accidentally press the initialize button which reset everything. If anyone has the apexi vtec controller like mine or just a v-tec controller in general knows how to set it up can help me with the setup? I want my prelude vtec to kick in at 4500 RPM (is that to low?) and for everything else I want just a regular setup for my lude to run good. thx Id greatly appreciated
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Old 05-30-2010, 06:20 PM
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Re: Apexi v-Afc vtec controller

Why VTEC earlier than usual - what mods have you done to enable this?

The ideal place for the crossover point is where the torque curves cross over. For example you run one dyno run totally on the low cam, then another one only on the high cam. Where the two torque curves cross is the best place for the change - there's nothing worse than having a red hot go, then shifting into a hole where there's no torque.
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Old 05-30-2010, 06:48 PM
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Re: Apexi v-Afc vtec controller

What he said.

Or just have it kick in at 5200-5600rpm, which is stock. Its somewhere in there anyway...
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Old 05-30-2010, 10:13 PM
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Re: Apexi v-Afc vtec controller

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there's nothing worse than having a red hot go, then shifting into a hole where there's no torque.
I think you just like saying that... lol

The initial settings for the VAFC are waaaaay off of what you want to run (if my memory serves me right). When I had mine and I reset everything to default, it kicked VTEC engagement up to like 5800 (way too high). And stock VTEC engagement is 4900 or 5200 depending on the variant you have.
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Old 05-30-2010, 10:19 PM
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Re: Apexi v-Afc vtec controller

yea I paid more attention to where my vtec kicked in today, it was at 5200.
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Old 05-30-2010, 10:40 PM
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Re: Apexi v-Afc vtec controller



See, I'm not exactly sure. The H22A1's are 4900 (that's what mine is, and that's what the Helms says for 93-96). I THINK they changed it to 5200 on the A4's, I'm not positive though. And I really have no idea about any of the other variants.
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Old 05-30-2010, 10:57 PM
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Re: Apexi v-Afc vtec controller

Well sometimes it seems like 4900, other times it seems like 5200. I really haven't paid much attention and they're really close ya know? I have to concentrate more on shifting cuz for some reason why it lets out higher than it should. like really high. Anyway its a pain in the ass and no one wanted to help me adjust it
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Old 05-30-2010, 11:06 PM
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Re: Apexi v-Afc vtec controller

its 5500 on the a4's
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Old 05-30-2010, 11:52 PM
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Re: Apexi v-Afc vtec controller

yeah i just tested out and the light turned red at 5500 RPM. Is that where stock vtec suppose to kick in at? the bad thing is I don't know much about how engine works let alone a vtec engine. Im using my prelude as a daily driver so what ideal RPM should it be set at for vtec? also does that mean that every gear you shift into, when the it gets to the the RPM range that you set the vtec for it will kick in right?
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Old 05-31-2010, 12:01 AM
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Re: Apexi v-Afc vtec controller

VTEC isn't gear dependent. As long as you meet the criteria for VTEC engagement (19+ MPH, coolant temp 140*) it will kick at the same RPM in every gear. If you have a stock motor, I would just set it to the stock setting. :shrug:
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Old 05-31-2010, 12:25 AM
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Re: Apexi v-Afc vtec controller

ohh cool. when i got the car, the vtec was set on 5200 so should I just set it back because I dont know exactly what the owner before the one I bought the car from did to the engine. I let some kid drove my car and he said the car might have a tuned ECU and Clutch but I have no clue on how to check it (im a noob)
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Old 05-31-2010, 12:28 AM
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Re: Apexi v-Afc vtec controller

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a tuned ECU and Clutch
A tuned clutch? Holy sheit.
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Old 05-31-2010, 01:53 AM
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Re: Apexi v-Afc vtec controller

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A tuned clutch? Holy sheit.
LOL I believe he means a tuned ecu and also an aftermarket (not tuned lol) clutch.

But ya ditto w/^^^ leave vtec @ stock settings. My A4 head kicked in at 5500.
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Old 05-31-2010, 02:12 AM
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Re: Apexi v-Afc vtec controller

I'm pretty sure mine kicks in at 5200, then again I hit over 8k rpm and it didn't hit the rev limiter, so I dunno where the rev limit is...pretty sure my ecu is chipped but hell if I know.
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Old 05-31-2010, 06:22 AM
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Re: Apexi v-Afc vtec controller

Im almost positive my ECU is stock and i got to 8k one time and hit no limiter. I Normally never go that high in the rpm's though.
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Old 05-31-2010, 08:08 AM
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Re: Apexi v-Afc vtec controller

Then your ECU isn't stock. Redline is 7200, fuel cut is at 7500.
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Old 05-31-2010, 09:12 AM
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Re: Apexi v-Afc vtec controller

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Then your ECU isn't stock. Redline is 7200, fuel cut is at 7500.
well HUM...ill have to get in there and check once this rain stops and see what it is/isnt.
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Old 05-31-2010, 09:16 AM
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Re: Apexi v-Afc vtec controller

my vtec hits at 5200. Sorry 2 thread jack op, but why does some ppls a4's hit vtec at 55, and some at 52? I've wondered this for so long. And Im positive I have a a4
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Old 05-31-2010, 09:47 AM
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Re: Apexi v-Afc vtec controller

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my vtec hits at 5200. Sorry 2 thread jack op, but why does some ppls a4's hit vtec at 55, and some at 52? I've wondered this for so long. And Im positive I have a a4
i didn't mean to thread jack either but i have an A4 and mine hits in at 5200 also
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Old 05-31-2010, 12:15 PM
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Re: Apexi v-Afc vtec controller

Ditto...and that answers my question of whether or not my ecu is stock.

Not sure if I'm happy about that or not....
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Old 05-31-2010, 12:28 PM
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Re: Apexi v-Afc vtec controller

im pretty sure you can also use the apexi unit to turn your basemap a lil bit and get a few whp out of it by leaning(correct if wrong) out your system as 99% of cars come factory with a rich running econo tune i may have that reversed but i looked into one and decided to pass until i get some cams and actually need to change vtec engagement i did a bit of research on it...and hey if all else fails and you still want to use it take it to a shop and get a tune to work in sync with the v-afc....(or just take it out)
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Old 05-31-2010, 02:34 PM
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Re: Apexi v-Afc vtec controller

how can I check if it is tuned ECU or not? I dont even know where the ECU is even at.
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Old 05-31-2010, 06:32 PM
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Re: Apexi v-Afc vtec controller

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I'm pretty sure mine kicks in at 5200, then again I hit over 8k rpm and it didn't hit the rev limiter, so I dunno where the rev limit is...pretty sure my ecu is chipped but hell if I know.
You do not.

The factory analogue tach isn't the most accurate thing in the world. From memory the factory setting for VTEC engagement is 4950rpm. Even if it is reading 5200 when the high cam engages, it's still 4950. And like dbd said (we should listen to that man more often) fuel cut is at 7500rpm, so you won't be revving past that.
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Old 05-31-2010, 07:12 PM
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Re: Apexi v-Afc vtec controller

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And like dbd said (we should listen to that man more often) fuel cut is at 7500rpm, so you won't be revving past that.
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Old 06-01-2010, 09:11 AM
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Re: Apexi v-Afc vtec controller

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You do not.

The factory analogue tach isn't the most accurate thing in the world. From memory the factory setting for VTEC engagement is 4950rpm. Even if it is reading 5200 when the high cam engages, it's still 4950. And like dbd said (we should listen to that man more often) fuel cut is at 7500rpm, so you won't be revving past that.
Thank u for answering the question brash. I appreciate it. I've always wondered why ppl said their vtec engages at all these different rpm's and they all have a4's.
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Old 05-09-2012, 07:46 PM
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Re: Apexi v-Afc vtec controller

I have a 98 prelude sh stock ecu no piggy back but overbored cylinders. Im a 2.4L but my vtec kicks in at 5200 and rev limiter kicks in at just over 8k ive onlyhad one fuel cut when i mis shifted at just under 9k.
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Old 05-10-2012, 10:34 PM
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Re: Apexi v-Afc vtec controller

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Originally Posted by blackbb6 View Post
my vtec hits at 5200. Sorry 2 thread jack op, but why does some ppls a4's hit vtec at 55, and some at 52? I've wondered this for so long. And Im positive I have a a4
When I was using Castrol GTX 5W30 conventional, my VTEC engagment was at 5200RPM. And when I switched over to Mobil 1 full synthetic, it engaged at 5500RPM. So maybe this is why people are mentioning 5500RPM, because they are using synthetic oil.
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Old 05-11-2012, 12:22 AM
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Re: Apexi v-Afc vtec controller

Umm I'm new to hondas but pretty sure the ecu can't tell what oil your running and change when vtec engages, besides that I have Mobil 1 synthetic and mines at 5200rpm
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Old 05-11-2012, 11:58 AM
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Re: Apexi v-Afc vtec controller

fifth gen rpm gauges read high so when you take it 8k rpms it's really 7500 rpms
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