cpe standback with bov vta anyone??

[udontknowjack]

i remember jordan from cpe said something about safely vta with bov..... anyone done it or know how?? cpe is outta town for sema....i want to mess around with this.....

 

[Finkle]

well i get mine monday, but yes when u tune through ur laptop you have the option of venting, all u have to do is tell it to cut off fuel between shifts

 

[udontknowjack]

coo...i'll try that...thanx

 

[Craighjr]

I just got a base VTA maps from Jordan in an e-mail. This is what he said reguarding that. PM me your email and I will send it to you as I believe these are able to be traded.
Abreviated E-mail form Jordan
In this email I am including the VTA map. As I said on the phone before, this is a rough start for the VTA programming, but it will likely need a couple tweaks from you to work perfectly. I know the documentation for the Standback is lacking, so I'm going to give you a brief tutorial on how it works, and if you have questions I'll be happy to dicuss them with you, as I know this is far from straightforward.

For the VTA function, you're going to be using the "Fuel Cut Settings" in the Boost Control page in the Standback software. To understand how to program it, you need to understand how it works, so I'll try to explain it the best I can.

Fuel Restore TPS - Minimum TPS voltage which *disables* fuel cut
Fuel Restore RPM - RPM trigger to restore fuel
Fuel Cut Volts - Minimum voltage for fuel cut to become enabled
MAF Voltage Clip - NOT USED FOR VTA FUNCTION
Min MAP FC enable - The minimum MAP pressure required for fuel cut to enable

*Fuel cut is triggered by the -81 cells in the primary fueling table, which may require tweaking

Okay, so basically what you're trying to accomplish here is to shut the injectors off when you shift. In order to do so, we set conditions for the fuel cut to ensure that the vehicle *only* cuts fuel when you shift. In other words, when you flash the map to your Standback and drive on it, you might encounter a scenario where you trigger a fuel cut by accident. Don't panic, it's no big deal, and all you have to do is give it some more gas and the fuel cut will turn off. But the point is that you'll need to fine tune these settings to get it right so that you never cut fuel when you're on the gas.

Now I'd don't know your level of expertise, but if you think this is over your head then just give me a call and I'll talk you through it. It really isn't that bad once you get the strategy straight in your head, but you need to think it through a little bit. But as I said, I'm here to help so if you want to talk this through just give me a call.
Cheers,

Jordan M. Gartenhaus
Custom Performance Engineering
www.cp-e.com

 

[tru-boost]

i'm sure by now its well known that i am very anti VTA. i just want to say that even with a good tuning system VTA sounds like a PITA !! good luck making it work.

 

[Craighjr]

i'm sure by now its well known that i am very anti VTA. i just want to say that even with a good tuning system VTA sounds like a PITA !! good luck making it work.

HAHA yeah I will try to work it out if not I will be putting that reserc hose back on soon.

 

[Demi]

i'm sure by now its well known that i am very anti VTA. i just want to say that even with a good tuning system VTA sounds like a PITA !! good luck making it work.

Why? I dont have a management system, and i just went back to VTA with my HKS. I was under the impression that running VTA could cause it to stumble here and there but there was no real "danger". Am i running a risk? Should i swap it back?

 

[tru-boost]

no there is no danger, but there is a very slight loss of performance. you will never feel it, but a dyno will see it with a run through the gears, and i assume a trip down the track will show slightly slower times. i have no evidence of this on this exact car. no one has done compared dynos, but this prove true on evey other MAF equipped car i have seen the proof of.

 

[Demi]

MAF? Im a noob.

 

[chriscecc914]

one of the ways to run faster times at the track is holding steady boost in between shifts. If your cutting fuel in between shifts then you are definitley losing boost pressure. Resulting in slower E/T's

 

[chriscecc914]

MAF? Im a noob.

Mass Air Flow- What meters your cars air intake

 

[Demi]

one of the ways to run faster times at the track is holding steady boost in between shifts. If your cutting fuel in between shifts then you are definitley losing boost pressure. Resulting in slower E/T's

i was wondering about this too. I dont understand why cutting fuel could be better or help with the stumbling problem.

Mass Air Flow- What meters your cars air intake

AH-SO!

 

[Craighjr]

Because the MAF adds fuel for air that you Vent To Atsmophere. That fuel is there but the air is not. Makeing a rich spot as soon as you get back on the gas. Shutting off the injectors will give you a split second lean to fix the hichup and run smoother.

And to keep boost up if you flat foot shift the BOV will not do anything because the throttle plate doesn't close.

 

[Demi]

Because the MAF adds fuel for air that you Vent To Atsmophere. That fuel is there but the air is not. Makeing a rich spot as soon as you get back on the gas. Shutting off the injectors will give you a split second lean to fix the hichup and run smoother.

And to keep boost up if you flat foot shift the BOV will not do anything because the throttle plate doesn't close.

AH-SO AH-SO! That makes alot of sense.