20V MK1 Engine Swap 20V ST w/ BT AT ECU... S-AFC NEO?

sandsz · 12-23-2008, 07:08 PM

I'm back in action with my red '88 20V ST w/ BY AT ECU (Harness by mr220v).

But I need help! I'm looking at adding a piggyback airflow/fuel adjuster, specifically a S-AFC NEO. Anyone have any experience with this?

I am afraid that the Blacktop ECU might have some auto-learning function which would pretty much make the AFC NEO not help.

Eventually I'm looking at velocity stacks or even a Turbo... I currently have a T25 Turbo Manifold for my Silvertop and am looking for around 6psi T25 Turbo which this would help with as well.

Any Advice or help would be greatly appreciated!!

Adam C

mr220v · 12-26-2008, 01:27 PM

There's a big arguement on club4ag about whether the 20v ecu's adjust past the changes made with a standalone. No real concrete answers of course. I would imagine that the 20v ecu wants to see X voltage out of the o2 sensor. If it doesn't get it, the fuel trim starts to kick in. The only thing is, why would it do it on WOT? And why isn't it more of a problem with other toyota ecu's?

Anyway, for turbo setups, I've considered other alternatives.

I've often wondered if a 3sgte ecu couldn't be made to work? A gen3 3sgte ecu would be best and would require only a few additional sensors. Then there's the gen3 3sgte apexi power FC. Probably a very good alternative for the 20v. The 3sgte and 20v cam pickup and sensors are very similar. Making it work with a 20v would be just a matter of repinning the ecu plugs, or constructing an adapter.

12-23-2008, 07:08 PM	#1 (permalink)
sandsz No Skills Join Date: May 2007 Location: Stone Mountain Posts: 23 Thanks: 2 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	20V ST w/ BT AT ECU... S-AFC NEO? I'm back in action with my red '88 20V ST w/ BY AT ECU (Harness by mr220v). But I need help! I'm looking at adding a piggyback airflow/fuel adjuster, specifically a S-AFC NEO. Anyone have any experience with this? I am afraid that the Blacktop ECU might have some auto-learning function which would pretty much make the AFC NEO not help. Eventually I'm looking at velocity stacks or even a Turbo... I currently have a T25 Turbo Manifold for my Silvertop and am looking for around 6psi T25 Turbo which this would help with as well. Any Advice or help would be greatly appreciated!! Adam C

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

12-26-2008, 01:27 PM	#2 (permalink)
mr220v Beams Owners Group Join Date: Mar 2006 Posts: 2,527 Thanks: 13 Thanked 176 Times in 147 Posts iTrader Rating: (11/100% )	There's a big arguement on club4ag about whether the 20v ecu's adjust past the changes made with a standalone. No real concrete answers of course. I would imagine that the 20v ecu wants to see X voltage out of the o2 sensor. If it doesn't get it, the fuel trim starts to kick in. The only thing is, why would it do it on WOT? And why isn't it more of a problem with other toyota ecu's? Anyway, for turbo setups, I've considered other alternatives. I've often wondered if a 3sgte ecu couldn't be made to work? A gen3 3sgte ecu would be best and would require only a few additional sensors. Then there's the gen3 3sgte apexi power FC. Probably a very good alternative for the 20v. The 3sgte and 20v cam pickup and sensors are very similar. Making it work with a 20v would be just a matter of repinning the ecu plugs, or constructing an adapter.