HKS F-Con IS

[Jellybean]

I have Tomei 264 cams installed (BPU car) but until she warms up, cold start is a PITA

 

Would an HKS F-Con IS resolve my Cold start issues and still allow me retain the sequential setup?

 

Going full standalone , I would loose the sequential setup

 

I should be able to get the IS bought new and setup for 1000 euro , open to other options too

 

http://www.part-box.com/product_info.php?products_id=86687

http://www.rhdjapan.com/hks-f-con-vehicle-specific-harness-toyota-tp5-1.html

[Samurai 20V]

Whats the issue on cold start? Low idle?

[np89]

I think it sounds more like you have a vacuum leak somewhere tbh

[Jellybean]

Whats the issue on cold start? Low idle?

 

Cams have destabilised the idle , she runs a little rich till she gets to 30 degrees temp , stock ecu thinks there is a vacuum leak but once warm it's fine

 

Just a pita from cold and if you are out , you can't just turn the key and go ; need to wait till she warms up

 

But once warm she goes like an antichrist , fuelling is spot on and in my opinion no sacrifice in low down grunt

 

I want to retain sequential setup but make her more drivable from cold

[Wez]

Syvecs S6+ could be made to work with the sequential, its just three VSV triggered at various RPM points.

 

The first AEM PnP also runs the sequential, does a very good job of it too.

[np89]

Cams have destabilised the idle , she runs a little rich till she gets to 30 degrees temp , stock ecu thinks there is a vacuum leak

 

Thats because there probably is. My BC 264 cams never did this on my car on the stock ecu. Check the vacuum reference to the PS pump and the throttle body vacuums. They can affect idle alot if there is a leak at startup

[Jellybean]

Syvecs S6+ could be made to work with the sequential, its just three VSV triggered at various RPM points.

 

The first AEM PnP also runs the sequential, does a very good job of it too.

 

S6 + is very pricey , I might as well go motec in that price bracket

[Jellybean]

Thats because there probably is. My BC 264 cams never did this on my car on the stock ecu. Check the vacuum reference to the PS pump and the throttle body vacuums. They can affect idle alot if there is a leak at startup

 

I couldn't see anything a miss plus my mechanic said he is yet to see cams that work with the stock ecu ; he did mention using BC as well, bignum also has the same symtoms as me

 

Maybe if they are set to TDC it may help but then what's the point

[np89]

I couldn't see anything a miss plus my mechanic said he is yet to see cams that work with the stock ecu ; he did mention using BC as well, bignum also has the same symtoms as me

 

Maybe if they are set to TDC it may help but then what's the point

Might do no harm to maybe shim them up from scratch and use verniers to time them exactly? Even tho they should just drop in. Might save a bit of agro?

[Krister]

With the new cams, you have less vacuum as the cams have overlap, this is a porblem with a MAP sensor based ECU as it gives more fuel with less vacuum, thinking there is more air going to the engine.

 

If you have adjustable cam gears, you can time the cams so that there is not that much overlap.

 

AEM V1 and I think V2 also adjusts the stock turbo sequential system, but if your car is an automatic, I wouldnt run either.

[Frank Bullitt]

Syvecs S6+ could be made to work with the sequential, its just three VSV triggered at various RPM points.

 

The first AEM PnP also runs the sequential, does a very good job of it too.

 

Would the S6 be able to do this if the car is manual?

 

S6 + is very pricey , I might as well go motec in that price bracket

 

I thought so too until I realised how much the add ons cost on top of the MoTeC ECU to make it the same as the S6+.

 

The MoTeC is in a league of it's own both performance and cost wise

[Chris Wilson]

Cams have destabilised the idle , she runs a little rich till she gets to 30 degrees temp , stock ecu thinks there is a vacuum leak but once warm it's fine

 

Just a pita from cold and if you are out , you can't just turn the key and go ; need to wait till she warms up

 

But once warm she goes like an antichrist , fuelling is spot on and in my opinion no sacrifice in low down grunt

 

I want to retain sequential setup but make her more drivable from cold

 

Without a wide band it may be running lean, not rich. You NEED a good wideband fitting!!

 

Is it a UK spec car? Someone said MAP based systems are not ideal with wild cams. That's wrong.

MAF based systems are far from ideal as wilder cams cause air reversal that confuses the hell out of air flow sensors.

 

A MAP based system will run radical cams.

 

Are the cams timed in properly by someone that actually knows how to do it and has taken the time to do it correctly?

 

They are a PITA to time up with the engine still in the car....

[Krister]

MAP system with an OEM ECU that cant be tuned is not ideal, with a standalone it can be tuned easily.

 

In this case if it would be an UK car with a MAF, it would most likely run fine as it doesnt run by intake manifold vacuum but with the air measured from the AFM.

[Jellybean]

Might do no harm to maybe shim them up from scratch and use verniers to time them exactly? Even tho they should just drop in. Might save a bit of agro?

 

They are installed, shimmed as per tomei cam card , vernier pulleys are all dialled in

[Jellybean]

MAP system with an OEM ECU that cant be tuned is not ideal, with a standalone it can be tuned easily.

 

In this case if it would be an UK car with a MAF, it would most likely run fine as it doesnt run by intake manifold vacuum but with the air measured from the AFM.

 

That is true but tomei said they can run like oem on standard ecu only reason I got them , they where on special and I was doing the valve stem seals so why not throw them in

 

Will email Tomei see what they say , but like with everything racecar there is a compromise

 

Other than cold start she is perfect

[Chris Wilson]

It's not a standard ecu though, is it? It's had the fuel and ignition curves fiddled with by way of a daughter board(s).

[mellonman]

I said in another thread that the apexi afc is not good for a n/a -T but in this case this is where those products are made for but if your planning anything further in mods then you may as well get a propper ecu

[np89]

They are installed, shimmed as per tomei cam card , vernier pulleys are all dialled in

The Tomei cam card wont be able to tell you the shim size surely. Shimming is done with a DTI gauge and each valve will be different as to when it opens and closes and the cam lobe comes round. Was it done using a DTI gauge?

[Wez]

Would the S6 be able to do this if the car is manual?

 

Not 100% sure which is why I said S6+, you would need three spare outputs that can be triggered at different RPM points, although no direct sequential strategy you maybe able to utilize another feature.

 

The S6+ has additional IO which can be custom programmed so should be quite trivial to do.

[Jellybean]

The Tomei cam card wont be able to tell you the shim size surely. Shimming is done with a DTI gauge and each valve will be different as to when it opens and closes and the cam lobe comes round. Was it done using a DTI gauge?

 

YES it was done with a DTI gauge

[Jellybean]

Not 100% sure which is why I said S6+, you would need three spare outputs that can be triggered at different RPM points, although no direct sequential strategy you maybe able to utilize another feature.

 

The S6+ has additional IO which can be custom programmed so should be quite trivial to do.

 

Thanks for the help Wez , it would also mean a trip to the UK

 

Was hoping to do something less expensive reason the HKS Fcon IS caught my eye

[np89]

YES it was done with a DTI gauge

Only trying to help mate no need to take it thick.....

[Jellybean]

Without a wide band it may be running lean, not rich. You NEED a good wideband fitting!!

 

Is it a UK spec car? Someone said MAP based systems are not ideal with wild cams. That's wrong.

MAF based systems are far from ideal as wilder cams cause air reversal that confuses the hell out of air flow sensors.

 

A MAP based system will run radical cams.

 

Are the cams timed in properly by someone that actually knows how to do it and has taken the time to do it correctly?

 

They are a PITA to time up with the engine still in the car....

 

She is a JDM car , the cams where dialled in correctly by a Supra specialist , I learned my lesson with guys down south

 

Not too sure if he took the head off , he was doing another too heads when I dropped up to collect mine but all the usual tooling used , DTI guages

[Jellybean]

It's not a standard ecu though, is it? It's had the fuel and ignition curves fiddled with by way of a daughter board(s).

 

That is true , Sard Analyse ROM , I know it raises boost cut to 1.3 bar and eliminates speed limit, rev limit is standard but what ignition timing was altered if any I could not tell you

[Jellybean]

Just off the phone with the Irish HKS power writer , I was a little surprised with their input based no my cars basic Spec

 

Using a HKS IS Vfcon Piggy back ; the ECU will eventually be overwritten by the standard ECU , she will over fuel like crazy , I will need to run full Open Loop (disconnect the Narrow band sensor) hence the over fueling.

 

Standalone Fcon VPro Gold , the wideband sensor is as expensive as a link ECU they said , 800 GBP ; I asked if they can use a Bosch they said no

 

They are pushing me to get a Link standalone ECU , coincidentally they are the Irish Link Agents too

 

Sounds a bit Irish to me to be honest! Any taughts?