V-tec controller. VVTi-L controller?

[Elliot H]

A mate of mine has recently purchased an aftermarket device called a v-tec controller for his Integra typeR, which cuts in the variable timing valves at 4000rpm giving him more accelleration lower down the rev range. I know that theres a lot of interest regarding the honda-elise conversion, but does anyone know of a simular conversion for the toyota lump as i hear all too often about the trouble of keeping the power up in the rev range. This device was fitted by a honda dealer and costs under £500! sounds pretty good to me!!

[_topcat]

My dealer told me that they can be 'chipped' to bring the power in sooner. havent followed it up yet. let me know if you find anywhere.

[DanH]

_topcat said:

My dealer told me that they can be 'chipped' to bring the power in sooner. havent followed it up yet. let me know if you find anywhere.

Wilsons tried to feed me that rubbish too. You can get a remapable ECU (google for apexi power ecu if interested) but I don't think theres any more to get unless you perform some internal mods.

[VTECMatt]

VTEC controllers are a waste of money, Apexi Power FC is very good thou, doubt it is available for the Elise thou.

[dannylt]

Why are they a waste of time? At least on the K20 engine (and I imagine on the B18s too), using the high lift lobes earlier helps torque. The only reason they don't come in earlier is emissions/economy/driveability. The cams should cross at the point their torque curves cross roughly speaking, and this will certainly be lower than 6k.

[DanH]

dannylt said:

Why are they a waste of time? At least on the K20 engine (and I imagine on the B18s too), using the high lift lobes earlier helps torque. The only reason they don't come in earlier is emissions/economy/driveability. The cams should cross at the point their torque curves cross roughly speaking, and this will certainly be lower than 6k.

Have a look at the torque curve. I did and it didn't look like much scope for improvement was available. Really you'd need a new cam but no one is grinding them afaik as they are complex to make with dual profile and not a big enough market.

Matt don't see why an apexi wouldn't fit, it is used in celicas with the same engine. Might have to rig it into the harness by hand though.

[dannylt]

The torque curves for both cams? I though they crossed at around 4k. Certainly mine is still on 6k and could well do with moving down.

[scuffham]

whist pulling in the high cams earlier can be helpfull, the chepo controlers can do nothing to fuel and time the high cams at these lower points, thus you are likely to be running lean and too much advance...NOT good.

[dannylt]

Ouch! So a proper remap jobby or Hondata replacement required rather than bodge.

[DanH]

dannylt said:

Ouch! So a proper remap jobby or Hondata replacement required rather than bodge.

99% sure the apexi can do all this. Simon is referring to the cheap mods for just moving the switch point I think.

As to moving the cam switchover on the yota, like I said, look at the torque curve. I couldn't see much (any) benefit on the graph I saw.

Not convinced much NA tuning work has been done on these yotas, and not even sure how much scope there is as they are already putting out pretty good power for their capacity. If you are interested in this stuff, all the good info is on the celica message boards in the US. Thats where I did all my research before deciding not to go for a yota S2 Exige.

[nildram]

My Type-R Elise has a variable VTEC cut-in point, that varies between 4k rpm and 6k rpm depending on what you're up to with your right foot. Definitely worth having!!!