whats up guys.....my vtec kicks in at 5800.....but yesterday and today for some reason it doesnt kick in untill around 6200rmps........i checked my oil and it is fine...anyone have any ideas?

 

What car, motor, etc. How exactly do you know it's kicking in late? Maybe your tach is off?

 

was the engine warm/hot?
did you check you oil level?
were you at WOT?

if your engine isnt under load and you are in a high gear the vtec will cut later, on my car in 5th gear the vtecsometimes wont come into 4800/4900 (stock 4400) as the throttle isnt open fully, and the engine isnt under load

 

lsvtec motor....its never happend to me.....ill try to check the oil again and see what the deal is. andyone else know why?

 

also what is WOT?

 

Wide Open Throttle (when you stamp on the gas pedal)

 

did someone swap your ecu? lol does it always switch at 6200 even at full load? or is it just sometimes?

 

just started happening to me....i checked the oil again its fine...im clueless

 

What kinda oil pressure are you running ? and how is your solinoid valve holding out ?

 

i dont have an OIL presure gauge... and i just changed the vtec soleniod gasket a month ago....it looked alright.

 

What's the LSVT setup as far as head/block/ecu ?

 

check connections from ecu to vtec soleniod. maybe wirings getting old or something and it's not getting any signal. if all else fails, get a vtec controller. they come in VERY handy at times as such.

 

94 Ls BLock (50k miles on block befor built)
p30 JDM b16 (sir2) pistons 11:5 compression
Honda Rings, bearings etc
ARP rod bolts
Brand new Thermostat
brand new LS water pump
Type R oil Pump
New timing belt

BLOCK is BALANCED and BLUEPRINTED
Only 6k miles on this motor since built....never had ANY problems

B16 Head
SIR2 Fuel rail
00 Si Intake Manifold
00 Si distributor
CTR cams (2000 miles on them)
ITR valve train
Skunk2 Cam Gears
AEM fuel presure regulator

 

What ECU ? Custom chip ?

 

p28 with mugen program vtec 5800rmps redlline 10000rpms....motor went 13.3@101.28 on street tires....never have had any problems......and then my vtec started kickin at like 6100 instead of 5800

 

Is a vtec controller the same thing as a V-AFC? Do vtec controllers give you more hp? I heard it might help your midrange, but is this true?

 

no a vtec controller doesn't give you hp. you can tune(air/fuel) with the VAFC and control the vtec engagement point and that's about it. you might be able to get a few horses out of your motor because the ecu is still a SOHC ecu no matter what chip you put in it. but the main thing is that you can adjust your vtec engagement point which comes in handy cause you can set it to kick in at any rpm.

 

im willing to bet 2$ its oil related
it sounds like its not building enough oil pressure for vtec to engage when its supposed to.
you might want to swap ecu's with a b16 and see if it turns on at the same time just to be sure.

 

Is it fully engaging at 6200 rpm ? or does it kick in an out rapidly from 5800 rpm to 6200 rpm ? (and then engages fully after 6200).

 

fully engage at 6200