VTEC slipping

[*EYECANDY*]

Hi Guys

I need some advice... My JapSpec Type R's Vtec has slowly been slipping...

It used to kick in at 4800 rpm now it kicks in at 6000 rpm...:(

Has anyone has anything similar happen if so what did you do?:confused: I know I could install a VTEC controller but this wouldn't fix the actual problem..

It has only just been serviced.. Do I need to take it to a Honda dealer?

Thanks in advance

Kat:D

[bigjo5]

ecu problems?

[[CRA23]]

the standard rpm for the big vtec cam is 5800rpm, and generally most tacos are out so it will look like 6000.

4800 sounds very low unless you have a chipped ecu like a spoon ecu ect

[PaZzMaN-R]

wtf! 4800rpm change over point stock?
any mods done such as a new ecu or vtec controller?
if stock it sould not be changing over at 4800. is it still kicking in hard? have you checked your oil level?
please give us more information as the more information you provide us with the easier and quicker it is for us to help you.

ilan

[JasonGilholme]

If you've got Piggy back ecu/vtec controller have a look into that cause it could be causing your problem.

Also, VTEC operates around oil pressure so make sure you've got descent oil pressure. You may have had a slow leak which is causing your engine to reach the desired oil pressure later on in the rev range, hence VTEC engagement slowly shifting.

[*EYECANDY*]

Well its only just been serviced so it has heaps of oil in it.. i don't know if it has a new ECU when i bought it i was under the understanding it was stock.. As when I took it to a Honda dealer they were complaining that the Jap engine wasn't matching up to the Aussie comp well...

Are you suggesting a new ECU? I don't have a VTEC controller...

Yes the VTEC used to always kick in a 4800 now its at 6000.. Does this have something to do with it being a Jap spec engine?

Even now when it kicks in it seems to be lagging a little with not as much pull..

Kat

[Edgeauto]

VTEC engage/disengage is set in the ECU and there is no way it can change by itself. As said above around 5800rpm is quite normal. I agree with checking your oil level besides that there is not much you can do.

[Edgeauto]

If you want to adjust when your VTEC kicks in run a conversion harness and a OBD1 ECU then you can adjust everything even maps.

[lenz]

try cleaning your vtec solenoid sealent and check cracks etc and use sealent glue to put itback on remember drain abit of oil before you do it

[[CRA23]]

the jap engine should talk to the comp fine as they are both the same its just the maps are different, i say it may have been chipped, this is ehy it wont talk properly, i also have a Jap Type R and have no problems with the ecu talk to the computer and vtec kicks in at 5800

[JasonGilholme]

Might want to check the quality of the wiring. Might have too much resistance that is building up and the signal isnt gettin to where it needs to be??

Good post CRA23 :thumbsup:

[ECU-MAN]

do you have a dent in the sump at all

[JohnnyVtec]

Check alt, batt, & dist.... if there are no appearant oil leaks or oil burn scent. Or just take it back to honda and tell them you're not happy with it. The service manager should be eager to see you leave with a smile.

Cheers,

[[CRA23]]

The service manager should be eager to see you leave with a smile.

Cheers,

Thats the funnyest thing i have read in a while :D

[Slow96GSR]

VTEC kicks in when 3 things are met, rpm, vehicle speed, and oil pressure. Check and clean the VTEC solenoid, check all electrical connections, check oil level, check oil pressure at idle and at 2500-4000 rpm, and check the sump like ECU-Man said.

[eG_YoDa]

i thought vtec engages in type R's around 5800 rpm anyway?

[EK4R]

are you on full throttle ? i have a JDM engine and it kicks above the 5.5 mark (give n take for the tacho reading) soo i duno how yours kick at 4.8 with just a vtec controller. maybe u were mislead or it just sounded like its vtec but really its just exhuast being louder?? what make you say ur vtec kicked in at 4.8?

[JohnnyVtec]

;989980']Thats the funnyest thing i have read in a while :D

???:confused:

[ProECU]

IAB.

it kicks in before vtec engages.

This is likely what you are experiencing. If you've changed your intake system, this will make it more pronounced.

[[CRA23]]

johnny: ive never had a Dealer service manager try to make my happy, all they tryed to do is cover there F&^K ups with as little effort and money put in. i have vowed never to take my car to a dealer service again new or 2nd hand

[destrukshn]

;990317']johnny: ive never had a Dealer service manager try to make my happy, all they tryed to do is cover there F&^K ups with as little effort and money put in. i have vowed never to take my car to a dealer service again new or 2nd hand
don't let 1 dealership ruin it for you.
there are some very good dealerships out there that still do have morals.

[*EYECANDY*]

Thanks for all of your suggestions!!! That is much appreciated has given me a few ideas on what to look at!

Keep them coming!!

- Kat
:D

[ProECU]

Hence...


perhaps some more info on the car setup could help.

[CRXer]

VTEC kicks in when 3 things are met, rpm, vehicle speed, and oil pressure. Check and clean the VTEC solenoid, check all electrical connections, check oil level, check oil pressure at idle and at 2500-4000 rpm, and check the sump like ECU-Man said.

dont forget manifold pressure & coolant temp.

EDIT:my aftermarket ecu lets u adjust for throttle position as well,cant remember if its a stock function of vtec.


OBD1 Conversion harness on a 1993 Integra (OBD1)?
Isn't that pointless:confused:

perhaps some more info on the car setup could help.

arent all B18CR's OBD2?

[silver_screen]

kickin in @ 4800rpm??? thats very abnormal considering its a stock ecu...

6k (5800rpm) is where its meant to be anywayz. u dont have a problem. ur just imagining things

[CRXer]

Whats the model of the ecu?

could be runnin a OBD1 P72,vtec at 4400-4800rpm,map would prob change at 5750(to allow for IAB) giving a false vtec kick?

[CRXer]

wouldnt surprise me if this thing turns out to be a jap P72 motor with some red paint on top & IAB's still in place that someone has sold as an "R" & the vtec has just fallen off.........

[Edgeauto]

There are few people in adelaide that would be happy to look at it or just post a pic of your engine bay and that should clear up alot of confusion. (and maybe a pic of your ECU.)

[typerinside]

LOL vtec kicking in at 4800rpm, do u have VAFC and adjusted ur VTEC to kick in, anyways standard VTEC kick in point for DC2r is at 5800/6000 unless as i said before if u have VAFC,

[Dc_II]

My V-tiR teg kicks in about 4500 (small engage) but then screams at the 6000 mark. 4500 all the time without fail as I can hear the note of the engine change instantaniously

Stock ECU im running as well too.

[yourfather]

yeah but thats a P72 motor mate, different maps for different engines mate.

mine is the same DC_II

[Dc_II]

Sweet!

Well problem is, my mate bought a VTi-R 2 days ago and Vtec is kicking in at 6000rpm. there is however a ding in the sump which will be fixed this saturday.

PLus thermo stat is rooted so engine is always on COLD!!!

[JohnnyVtec]

;990317']johnny: ive never had a Dealer service manager try to make my happy, all they tryed to do is cover there F&^K ups with as little effort and money put in. i have vowed never to take my car to a dealer service again new or 2nd hand

I understand why you might be put off of them. They're not all like that though. Very much like destrukshn said. There are some good ones. I'm pretty sure we've all got nightmare scenario's that have happend due to dodgy mechanics. Think posative m8.


Cheers,

[spardikis]

why has no one seen the sense in this?? the type r's factory ecu will kick in vtec at ~ 5800 rpm. Since when did vtec engage in a type r at 4800rpm?? your thinking of a vtir integra aint ya??

[yourfather]

if you read the post thoroughly, you will see that the difference in crossover has been explained and that B18C P72 motors have crossover earlier than B18C7 Type-R motors.

[BlitZ]

people actually say on the p72 heads (b18c2) the vtec feels like it kicks in in 2 stages.. once earlier than later..

not sure how technically correct that is

[CRXer]

people actually say on the p72 heads (b18c2) the vtec feels like it kicks in in 2 stages.. once earlier than later..

not sure how technically correct that is

when my p72 was stock'ish,the 4400-4800rpm vtec change was barely noticeable,very slight noise,very slight kick,you wouldnt know if u didnt know it was happening.

the IAB change at 5750rpm was very noticeable,as witnessed on a dyno graph i have.

so if u didnt know about the IAB's & were listening/feelin for vtec kicks,it would feel like 2 stages,slight 4400rpm & more noticable at 5750rpm.