Deep Singh

Can an Ecutek 3 remap take account of a VTA dumpvalve?
Many thanks,Deep.

Deep Singh

BTTT

Matt Churchill

Can't help you on a 3, but I've got the 2, and a VTA valve - makes no difference. I seem to remember being told that before I had the Ecutek added.

dowser

Do you mean can it be adjusted to take account of the fact that metered air is being released from the system with a VTA? If so, no

You *could* back off fuelling at a given rev zone which would then be your change point....but heaven help your engine when you miss it, lol!

Richard

Deep Singh

Thats two opposite views,are you trying to confuse me??

ozzy

Deep,

The Tek3 is the 'official' custom remap, so if having a VTA dump valve had *any* affect on how your car runs, then the custom map can accomodate the necessary changes.

The Tek 2 is just a slightly more conservative map that's sold as is. I guess it probably runs rich to make sure anything added to the car doesn't make it run lean. Rich = good, lean = bad is what I've always been told is a very good rule of thumb.

I'm no expert, but I've always been told to stay clear of dump valves unless I need to replace the OEM recirc one and even then, I should fit another recirc.

Anyway, the point is that you need to determine how the VTA is affecting the car and then alter the fueling, timing (or whatever the correct areas of the map are) accordingly.

I'm sure someone like Bo Rawle, Stephen Dole or John Banks would be able to give you a much better idea of how it affects things.

Stefan

dowser

But what issue are you concerned about exactly? VTA dump valves pose the same problem for any set-up which is metering air coming into the system. A VTA dumps this air instead of recirc'ing it, so fuelling is on the rich side at lift off.

However, this doesn't appear to have any long term ill effects except for the occasional flames if you're decatted.

So problem doesn't change between any MAF based ECU - standard and EcuTek remaps are affected the same.

Richard

john banks

I've done cars with VTA and there have been no issues in particular except one which was the APS hybrid one which was leaking and messed up the idle.

The issue of overfuelling on lift off remains, and there is no easy way to get around it with the mapping.

mutant_matt

I'm no expert but the Ecutek has no magical powers of monitoring metered air leaving the system so I can't see any way in which it could compensate for this.

I'm not so sure there are no long term downsides to running a VTA DV as John Felstead was saying that it creates a lot of extra fuel into the cylinders and this may cause bore wash.....

I'd stick to a recirc TBH.

Matt

mutant_matt

Damn you John,

You could have let me finish typing so it looks like I know what I'm talking about and not just copying you

Matt

EvilBevel

John, serious question: do VTA's leak on part throttle ? (pressure difff pre & post throttle butterfly causing DV to open)

I'm pretty sure the OEM DV does this

john banks

I reckon you're right Theo - if the pressure difference across the throttle butterfly is enough to overcome the spring.

EvilBevel

It's an important question I think ... cars would run overly rich in this scenario, with much more side-effects than the lift-off issue. Unless they use "stiffer" setups needing more of a pressure difference to overcome the spring - but that would also mean less protection for the turbo ?

Floyd

iTrader: (9)

Theo, I've listened to you before about BOV's and thought you gave some good advice. I had to check this out for myself even though I didn't want one myself (I am quite mad).

Well it turns out that you seem to be correct. I tried converting the std unit to VTA and it went horribly wrong. The moment you touched the throttle the car would die, there was overfuelling like a sunken oil tanker off the Spanish coast and no benefits were obtained.

The std unit LEAKS big time.

No further experiments will be conducted in this area by me

For anyone else, unless you want flames then don't bother.

F