A7 vs A13 ecu

[25two.stroke]

I know there is a thread on here with this exact same title and it got nowhere. I would like to see if anyone knows the difference between the 11350A7 and the 11350A13.

Yes I know the biggerhammer website, he doesn't go back that far
Yes I know I cam buy a Brucato and not have to deal with TPS modules
Yes I know the A13 was superseded by the A40.

What is the difference between these ECUs?
What tps style does the A13 use? I've seen it with the 5 wire TPS module but can they also use the rotary TPS on the horn?

I know the 5 wire TPS module looks at the stator pulses and the intake vacuum to send a signal to the ECU. Does the 3 wire TPS on the horn create the same voltage reading as the 5 wire module at the different throttle positions?

Can the a13 use a rotary tps? Can the A7? What tps cam stock on the A7 and A13 respectively?

- J Avery, regarding 2.4L bridgeport and 2.4 ovalport EFI

[TEXAS20225]

im thinking most the folks who knew anything about those old ecus are no longer visiting these forums i had a coulple of Bridgeport's years and years ago with the eternal tps on them may still have one laying around but i remember something about frequently blown motors with them or something like that all i can say that i knew for sure i moved on

[25two.stroke]

Does Tony Brucato look at this at all anymore?

[25two.stroke]

It seems the early A7 ecu came on motors that in the beginning had the rotary tps and later had the vacuum 5 wire tps module
By the time A13 was in production on the motors the vacuum 5 wire tps module was standard.

Given that the A13 was a direct replacement for the A7 ecu (if one went corrupt) does it mean that it would run with either style tps? Or was there a service bulletin that said to replace the TPS when the ECU was upgraded?

Also, were there problems with the rotary TPS? It seems like a simpler design than the vacuum&electric pulse module that came after. Why did they ditch the rotary?

[Dd24skater]

I used to swap the A-7 for the A-13 and it was a direct replacement........and yes I'm old enough, but still look at these forums......once in a while.

Love my Bridgeports!

[25two.stroke]

I used to swap the A-7 for the A-13 and it was a direct replacement........and yes I'm old enough, but still look at these forums......once in a while.

Love my Bridgeports!

Thank you for the reply!
Can you recall what TPS you used with the A13? Rotary, 5 wire module or either?

[Dd24skater]

Thank you for the reply!
Can you recall what TPS you used with the A13? Rotary, 5 wire module or either?

Rotary

[25two.stroke]

Rotary

Thank you

[Brosco]

Thank you

I’m still dealing with this same issue i have a a7. And a a13. Can u i use a rotary on the a7 and a13. Vice versa with the 5 wire vacumn ?? Or does one only go with the other ???

[PanRonnie]

Also, were there problems with the rotary TPS? It seems like a simpler design than the vacuum&electric pulse module that came after. Why did they ditch the rotary?

I think that it was easier to adjust the fuel adjustements to different engines with a seperate pneumatic design than the TPS
At 75% TPS most engines are already getting max possible flow through their intake thottle
This is offcourse with the older analog ecu,s once you go digital it becomes much easier
but is still somewhat of a challenge because of the poor vacuum of the 2 stroke engine at idle

Brucato uses a 50 Kpa sensor to get a wider voltage range
At start you see a manifold value of 1001 units once it starts it runs around 600 units
This has nothing to do with any manifold pressure units but they simply made a range of the the maps sensor voltage range

the 600 units idle manifold pressure would actually be 80 to 85 Kpa

[25two.stroke]

I’m still dealing with this same issue i have a a7. And a a13. Can u i use a rotary on the a7 and a13. Vice versa with the 5 wire vacumn ?? Or does one only go with the other ???

I tried both and they do, in fact, both work. They swap. They do run different though. I can tune idle/midrange with the rotary pot tps whereas the vaccum module is fixed. You can't adjust it. Moreover: the rotary is easier to test and find when its gone bad.

The best ecu I found for my BP is the A40 digital. The a40 chip in a digital 11350 is a killer combo. Idles at 750 in gear like a dream and doesn't load up. Mash the throttle and it pulls hard right up to 7700. John Marles hooked me up with a 9k/unlimited chip that runs super good past 8k too. At 6000 let your foot off it instantly back to idle and the engine slowly coasts down to 900 and sits right there. Never stalls or hiccups. The analogue ecus seem to run good at WOT or at idle-mid...but its hard to get them to run perfect all around.