when i was driving my car i thought it would be nice if the vtec ingaged lower like 4500 or 4300. is there anything i can get to make it do that?

 

V-AFC

FYI, I have I/H/P/spacers as far as engine mods are concerned, and dyno testing indicated that 4800 was the optimum setting.... which happens to be the factory setting.

I don't know why you think it would be "nice" to have it engage at a lower RPM. It's only going to rob you of power and disturb the powerband.

 

mine hits at around 5k. it works perfectly in every gear except 3rd to fourth.

 

ya 3rs to fourth i dont understand at all y its set up that way

 

and acctually the new RL puts the change over at 4950

 

The VTEC engagement on every J32 is 4800 rpm and it's just fine right where it is.

 

3rd to 4th gearing is horrible... We should be in VTEC when we redline 3rd and hti 4th. This is BS!

 

 

It's called overdrive

Is there really the need to be in VTEC above 110 MPH?

 

Actually this is a 5spd auto, overdrive is 5th gear not fourth... This car literally has no power when it shifts into 4th, its pretty pathetic... Also yes there is a need for VTEC above 110mph when you say your vehicle is a "Type S" 260hp car. Why do the 6spd guys get vtec when they shift and we dont? I cant really say anything good about this transmission anymore, look at all the recalls and design flaws. Its just one messed up piece of metal they call a transmission.

 

Actually both 4th and 5th gear are overdrive

And in the 6spd the gears are much shorter. At the top of 4th gear you're only a few MPH faster than 3rd gear in the automatic.

When you shift from 4th to 5th in the 6speed you drop out of VTEC just like 3rd to 4th in the automatic.

 

 

sure about that? the cl-P is at 4300 if i remember and the new TL is 4950 i believe

 

im looking at this...trying to come up with a higher final and a shorter 4th

 

Is the CL-P lower? You might be right. And I don't know much about the new TL. I should have said "every Type-S." My mistake.

 

thats y i think the vtec should be lower like at 4500 rpm 3rd to fourth is just pathetic i think it should shift into fourth at like 5300rpm it speeds that high. i thihk it shifts in at like 4200 tho

 

Well, strip out your transmission, have custom gears designed and bolt it all back together. It has nothing to do with VTEC... it's gearing.

 

 

Don't forget to create a whole new ECU for the trans while your at it.

 

4400 for CL/TL -Ps, 4800 for CL/TL -Ss.

 

That shouldn't matter.

 

why wouldnt the car be faster with the vtec at 4400 even from first to second there is a little delay somtimes to vtec

 

because there will be too much lift and duration for that RPM and the car will boog ...

 

Don't ya think there was a reason why Honda has it that way... The engagement is set perfectly from the factory.

 

post #1,
yes it can be done thru over- riding the ECM/PDM vtec signal with "piggy back" aftermarket components. this has been tried by members and discussed at length in earlier threads. (Search function) and NO, i do not think lower vtec engagement would be preferable.
post #7, the compromise between "close" to "wide" gear ratio is inherent in most modern factory auto design, ours included. what we experience when our n/a vehicles shift from 3-4 is a substantial decline in the rate of acceleration.
the culprit is called "drag".
when our cars reach 90-95mph frictional drag has increased exponentially while our hp/tq remains relatively constant and after 56k to 57k rpm actually decreases slightly, resulting in the "declining rate" we experiance.
additionally the 4th gear ratio, is "wide" as it relates to 3rd gear and..... to a lesser extent, contributes to this rate decline.
prior to purchasing, i,for one, studied the dealer literature regarding ratio and drag coefficient and anticipated this rate decline. i test drove the vehicle and found my pre-supposition to be correct. i welcomed this ratio change, as i surmized my highway gas mileage would increase substantially, crusing at 65mph at 1925 rpm ( after tq converter lockup in overdrive, 5th gear). i was proven correct . 3450 lb vehicle, substantial 0-95 mph acceleration, 25mpg city 35 mpg highway mileage !
there is however a solution to your concern, the factory supported dealer installed option of a supercharger will increase hp/tq and will delay this "rate of decline" untill approximately 110 - 115 mph when again, drag will overcome available power.
spend the money - son

 

IMHO, I believe lowering the RPM where VTEC comes in would hurt performance. This is because the RPM would be too low to handle the flow characteristic from the increased duration of intake/exhaust valve open states -- resulting in lost torque.

 

Now if we were talking about the K20A2 with i-VTEC it'd be a different story. I that motor.

 

is that the new RSX engine? (i don't know my motor numbers, well only the CL anyway)

 

No that's the '02-'04 RSX engine

The '05-'06 RSX engine is the K20Z1 which is nice too but in order to tune it you must use a '02-'04 ECU piggyback.

 

i wonder if anyone could point me in the right direction of the lift and duration (both lobes) on the '05 RL,TL,01-03 CL-S ...i might wanna experiment