This car was running 490 hp in Japan on Jap fuel, now it's in Canada and time has come to detune it for local octane. The shop I'm using says that I will need an AFK (HKS afaik which is $1000 before install)

setup
HKS Fcon Vpro
duel selenoid EBC
T04S with an external gate
new volt upgraded ignition

I thought the fcon was suppose to do the job of an AFK?

 

To counter the octane difference I would add AI or decrease your boost.

 

I don't have a clue a bout tuning, does this mean I need it? I don't understand how this ran in Japan without it and I need it here, would an apexi SAFC work in place?

 

If you run water you will not need to retune.

It decreases the heat in the combustion chamber (much like adding extra fuel but much more effective).

This in turn reduces knock/pre det.

It's a saftey method. There is an AI section if your interested.

The only thing the computers can do is retard timing and add fuel to give more of a saftey cushion (SAFC is fuel only).

It's the difference between putting a band aid or fixing the core problem.

I would suggest reading up or taking it to a competent tunner.

 

The HKS AFK was recommended to me by a specialist, says he runs HKS Vpro and this with all his setups, I just wasn't expecting it to be $1050 at the price of an e-manage..

 

If you don't want to spend money on extra stuff, tell him to retard the timing some. There's not much knowledge of HK$ Vpro because it is such a tightly controlled system.

 

$1000 for a freaking knock sensor/AFR gauge? ouch.

You'd be better off going with an MSD knock alert or J&S safeguard, and then an aftermarket WB 02 gauge. I hope this dealer has experience tuning rotaries, because your options are limited for getting someone to tune the Fcon Vpro.

 

There's no magic octane in Japan unless he was operating the car on race gas. They use different ratings for gasoline, but running our 94 should be fine at that power level.

I'd start by getting your car away from whoever the hell is telling this bullshit.

 

Our 93/94 AKI is very close to their 100 RON. I'd bet its the same quality fuel really. To be on the safe side you could install a simple water injection system for $200-$400 depending on what you get. Don't waste your money on whatever that shop is selling you.

thewird

 

This x100. do this. This should be the first thing you have to do.

 

I disagree. I think your tuner makes lots of sense. Read why, HKS AFK description bellow. It would enable lots of features that two units can do in conjunction. they are meant to be sold together. If you already have expensive ECU, I would spend another 850 and be safe. It retards the timing when detects knock, just this alone is almost worth the money. Similar J&S unit costs $650 or so, but less wiring.. What about wideband and ability to run closed loop cruise... Do some research and you will see it just makes sense... it's been a year since you started the tread, just curious, what have you decided to do?

The HKS A/F Knock Amp is the perfect companion to the HKS F-CON V Pro ECU. The A/F Knock Amp includes a wideband oxygen sensor which provides accurate air/fuel ratio data, as well as interfacing with your factory knock sensor(s) to detect potentially damaging detonation (or knock).

The A/F Knock Amp has its own head unit to display both air/fuel ratio and knock level for the driver and it can also interface directly with the HKS F-CON V PRO ECU to provide some really smart functions.

With an A/F Knock Amp fitted, the F-CON V Pro can provide real time control of the air/fuel ratio to account for changes in atmospheric conditions. The F-CON V Pro can also use the A/F input to autotune the fuel table.

When knock occurs the signal is sent to the F-CON V Pro ECU and ignition timing can be removed to safeguard your engine. This provides great peace of mind for your highly tuned engine.

 

is RCTS the specialist?