Problem with V-tec on a D16Y8
 

Hello HMT Comunity:

I have a problem with my Vtec System and ECU. I got a 1997 Civic Ex with the stock P2P OBD II ECU but i have the Vtec engaging by the MSD RPM Activator Switch with a 4800 RPM Engagement point. The problem i am having is that sometimes (recently ALOT of times) i get the check engine and the OBD II Scanner shows Vtec system malfunction. I was wondering if anyone here knows how i can Fix this without switching to a Hondata Chrome or Uberdata or a Apexi VAFC or VAFC II basicly by keeping the Vtec opening with the RPM Activator switch since it is brand new and was a head ache doin the relay wireing to change the RPM Switch from negative to positive wich is what its needed to open the Vtec.

Re: Problem with V-tec on a D16Y8
 

i thought vtec engaged at 4800 on those? not sure tho. if that is true why did you add the msd?

plus i have no idea, i dont ---- with the vtec garbage.

Re: Problem with V-tec on a D16Y8
 

no Vtec on the D16Y8 engine engages at 5800 RPM or close to it sometimes 5500rpm

Re: Problem with V-tec on a D16Y8
 

my bad, i got a vafc 100 shipped ;D

Re: Problem with V-tec on a D16Y8
 

nice they selling one here for 150 just dunno if to get it or not i managed to put 200whp 165ft tq. at the wheels with stock engine stock internals stock ECU but the VAFC manages to advance the ignition so i have no idea if my engine would be on the safe side with the AFC Hack. http://www.cardomain.com/ride/2613986 there is the dyno sheet and car pics

Re: Problem with V-tec on a D16Y8
 

I don't even know where to begin. Maybe you should unbolt everything from the car until you've read all stickies and understand them.

Re: Problem with V-tec on a D16Y8
 

Do what the ancient Inca's did stare at this until you come to a sacred understanding.
http://umbra.nascom.nasa.gov/images/...4_0121_304.gif


and take anything MSD off of your honda and go with crome/uberdata.
Msd makes good stuff for old school v8s but all their ignitions and parts do is screw up a honda ignition.

Re: Problem with V-tec on a D16Y8
 

And listen very carefully to anything Joseph Davis has to say. :P He followed Goforth to pinks!!

Re: Problem with V-tec on a D16Y8
 

I dont get it but w/e Ive ran the set up like that for over 1 1/2 years now just the v-tec thing is getting to me. 9 PSI is the threshold for these engines and the fuel management is being done with a 1:1 fuel regulator, 315cc Toyota MR2 none turbo injectors and just in case a 5th injector with a boost switch since i have the stock P2P ECU.

as for Chrome and Uberdata, 2 big problems with them:

1- i need a OBD I P28 (minimum or p72 , P73) and have the car converted to OBD1 either with a 92-95 harness or a harness converter.
2- No one in Puerto Rico tunes chrome and uberdata so that means i'd have to buy a laptop , rom programer and tune it myself wich between the lap top , rom programer and the other goodies = alot of cash

Re: Problem with V-tec on a D16Y8
 

Um you can get willem burners cheap. all you need it an auto p06 and you'll have most of what you need to convert it into a p28. there are writeups on how to make your own conversion harness. And uberdata doesn't take much of a laptop to run at all.

Re: Problem with V-tec on a D16Y8
 

not alot of cash, anyway you will havent more problems with this ---- maybe and im sure will learn alot ...

P.S are ur sure there isnt no one crome/UD tuners in puerto rico? ive seen fasters hatchs runing there .. ???

Re: Problem with V-tec on a D16Y8
 

There's no doubt...I have seen some fast cars in P-R. I deal with a bunch of guys from there, but they have a really bad habit of doing things half-assed.
You run into issues with y8's and obd1 tuning, mostly dealing with the timing that JD can fully elaborate on. I honestly don't see why you'd want to lower your vtec engagement point, but hey...it's your car and perogative. Because you're still pretty well set on running obd2, best bet probably would be to get a vafc. The afc pretty much tricks the ecu into thinking vtec isn't engaged when it is and you can add a fuel correction to it for a vtec mismatch as well. But because you're running a fmu, I'm going to assume you have check valves or a missing link ( :X ) so your afc would really be useless for tuning boost.

Re: Problem with V-tec on a D16Y8
 

check valves would be the thing but i already found a VAFC for 100 bucks a friend of mine had the same trouble i have with the chrome and uberdata and he did the only thing left for him, changed to Hondata since he couldnt find a chrome or uber tunner. he sold me the VAFC for 100 bucks wich is a sweet deal and now im thinking of running the VAFC hack while i can get enough cash to get the hondata or find someone to tune chrome ive been lookin and i know atleast 1 person in this damn island has to do it.

trust me ive been lookin for chrome and uber tunners for over 6 months now everyone i have asked says the same thing " I have been lookin for them also but in the end i gave up and bought the hondata and had Andy or Oso tune it for me", yeah there are alot of fast hatchs here mostly N/A or NOS set up doin 11's in both N/A or NOS set ups and a few running 10's in turbo set ups

Re: Problem with V-tec on a D16Y8
 

Ever look at a dyno plot of a single cam that engages at 4800? Exactly. Mid 5k is best from what I have seen.

Re: Problem with V-tec on a D16Y8
 

They spool a lot faster when you engage them lower, if the boost setting is on 'significant' instead of 'pissant' I'd suspect you wouldn't engage VTEC that late. ;)

Re: Problem with V-tec on a D16Y8
 

yeah i have my own car LOL i managed to get 17 whp with the vtec engagin at 4800RPM reason being same as Joseph Davis said Spools alot faster and with my Tranny being even shorter ratio then the stock K4F helps me alot with the vtec engaged that low instead of mid 5k's

Re: Problem with V-tec on a D16Y8
 

hmmm if you are making 200whp that tranny has to be hating life. The jet systems on the automatic transmissions in the EX have a tendancy to swell the seals when the fluid gets broken down, i.e. subjecting that much torque through the stock jet. No use changing the fluid either, then the seals just crack two weeks after you change it and then the whole tranny blows fluid around. Not a 100% though, ask bone.

Re: Problem with V-tec on a D16Y8
 

my car is manual not automatic

Re: Problem with V-tec on a D16Y8
 

hmm? car domain had two pedals.

Re: Problem with V-tec on a D16Y8
 

yeah 3rd pedal is under steering wheel due to the angle of the camara

Re: Problem with V-tec on a D16Y8
 

lol, got some E-detectives here

Re: Problem with V-tec on a D16Y8
 

Some of buk's shill accounts.