VTEC query

[Redz]

i was running at 5500rpm when vtec starts to kick in.... gaining momentum till reaches the red line.... then it suddenly goes to cruising mode 4500 - 5000rpm?? but still it maintains the speed even more!! reached till 180 until canot go some more... was the vtec supposed to be in crusing mode after reaching red line?? felt like calling those KM mechanics

[Andrewkb]

I'm not too sure abt the 1.7L.

 

On my 2.0L, yes, if I'm on NS highway, with ~3500rpm runs of abt 150km/h, I do get VTEC ON all the while.

 

BTW, the 2.0L VTEC engage at 2600rpm

 

Best is to DIY install a VTEC LED ;-)

Edited October 4, 2004 by Andrewkb

[Redz]

install VTEC LED?? how... and how much it cost?

[Andrewkb]

Heheh .. I told a lot of people: PRICELESS ...

 

It's all DIY :-P

 

Just get a LED, a 330Ohm 1W resistor, 2 wire, that's it :-)

[Redz]

that's the problem... i not DIY man

[Andrewkb]

The VTEC wire is green/yellow strip.

 

2 place you can tap it:

1) ECU

2) VTEC solenoid (which is in the engine bay).

 

I tapped from the ECU instead, since it's behind the glove box.

 

Just slice the wire, tap the signal to the LED (with resistor) and the other end to ground.

 

Viola !

 

Maybe get someone electrically trained ?

 

Since it's DIY, I don't want to help others in case I accidentally mess up the ECU :-P

*There's a risk factor here, though calculated risk*

Edited October 5, 2004 by Andrewkb

[Redz]

Just slice the wire, tap the signal to the LED (with resistor) and the other end to ground

 

wah that's a bit dangerous.... slicing the wire and tap...

[Andrewkb]

I've APEXi TT installed, SAFC installed, VTEC LED installed .. my ECU wire is already

 

Don't worry .. it's not as bad as you think ...

 

The wire is a signal output to the VTEC solenoid. So it's not supplying extra voltage to BURN the ECU, it's just taking the output signal (12V) to light up the LED.

[Assassin]

Hi Andrewkb,

 

You have any pictures for those who want to DIY ?

[Ahliew]

me too

[Andrewkb]

For those interested, do a search for "VTEC light" or "VTEC LED"

 

The key thing is the pinout from the ECU. Luckily VTEC signal cable is always green/yellow.

 

The best is the tap from the VTEC solenoid on the engine block. The golden cylindrical device beside the engine.

Just slice and tap the wire from there.

But I don't see any diff between tapping from there vs the ECU, since it's the same wire.

 

I'll post some pics if I managed to find them.

[Redz]

brudder... search function disable lah for time being

[Andrewkb]

Opps, I mean search engine like Yahoo or Google

[Andrewkb]

Here's one of the link:

http://www.clubcivicquebec.com/site/techni...smetic/016.html

[Redz]

aiya.. tot search here

[Andrewkb]

Here's the exact pinout for your D17A engine.

[Redz]

seriously... is my vtec running abnormal? it does open up somewhere at 4500rpm first... b4 another stage of surge opened up again at 5500rpm... then when it hit the red line... it goes back to 4500rpm with the speed maintain and goes even higher when tapping the accelerator..

 

is the vtec supposed to be maintaining at 6-7000rpm or it shd go back after hitting red line?

[Andrewkb]

I don't know much abt the 1.7L, but on the 2.0L, the VTEC is 2 stage only.

Stage 1 (<2500rpm): Engine runs on 12valve mode (economical mode).

Stage 2 (>2500rpm): Engine runs on full 16valve mode with higher cam profile

Virtual Stage 3 (>4800rpm): The dual intake runner change from long intake to short intake, thus another surge.

 

The D17A might be similar to the VTI-S, where the VTEC comes in at 4500rpm.

I remember the last time I test drove the 1.7L, the power indeed comes in ~4000+rpm.

 

The drop in rpm is based on the gear ratio, nothing to do with the VTEC.

If you're in 3rd gear, and at 6000rpm, and switch to 4th gear will probably drop it to 4000+rpm and climb up to 6000rpm again. Since U've no 5th gear, it'll stay at red line till U release pedal.