Full HKS exhaust with original ECU
#1
Junior Member
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Full HKS exhaust with original ECU
Hi my question is if I can run the original ecu with full HKS exhaust on my RX7 FC (1991model) the engine is stock and the previous owner removed the air pump. I also have Defi pressure gauge.
Thanks
Thanks
#3
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Thank you I ask because I read this thread:
https://www.rx7club.com/3rd-generati...ck-ecu-402931/
https://www.rx7club.com/3rd-generati...ck-ecu-402931/
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Sicko-21 (02-06-22)
#7
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#10
Theoretical Tinkerer
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The issue with full exhaust and stock turbo/ecu is boost creep. The wastegate is under-sized and cannot limit boost.
It can't be fixed with a boost controller.
Recent discussion of the issue here https://www.rx7club.com/2nd-generati...uired-1155350/
It can't be fixed with a boost controller.
Recent discussion of the issue here https://www.rx7club.com/2nd-generati...uired-1155350/
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#11
Junior Member
Thread Starter
The issue with full exhaust and stock turbo/ecu is boost creep. The wastegate is under-sized and cannot limit boost.
It can't be fixed with a boost controller.
Recent discussion of the issue here https://www.rx7club.com/2nd-generati...uired-1155350/
It can't be fixed with a boost controller.
Recent discussion of the issue here https://www.rx7club.com/2nd-generati...uired-1155350/
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Sicko-21 (02-09-22)
#13
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Can anyone confirm it?
Thank you
#14
needs more track time
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The Bonez high flow cat is a good option to help control boost - and make the car smell and pollute less. On colder days, you may still need additional boost control with an open intake. At least mine did once upon a time when I owned one 20 years ago. Try it and see. I often re-installed the stock airbox and a paper filter in the winter when I lived in NY to avoid boost creep.
Reverting back to the stock ECU, you may need to reinstall the smog equipment or you might get a CEL. Not sure if you have all those parts... Also, you should check if the Adaptronic is running on the stock wiring harness or if it was customized.
The suggestion for a wideband O2 sensor is a good one. At least it gives you a means of checking whether your car is running lean.
Reverting back to the stock ECU, you may need to reinstall the smog equipment or you might get a CEL. Not sure if you have all those parts... Also, you should check if the Adaptronic is running on the stock wiring harness or if it was customized.
The suggestion for a wideband O2 sensor is a good one. At least it gives you a means of checking whether your car is running lean.
#15
Theoretical Tinkerer
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update, unfortunately in Italy we do not have good rotary tuners. As a solution, I thought of buying the bonez cat and soldering it to my pipe (since it is also sold with 3 "pipes) and I read that in theory this cat allows to reach an adequate back pressure that allows me to use the original ecu.
Can anyone confirm it?
Thank you
Can anyone confirm it?
Thank you
If I were you, I'd get a wideband 02 sensor and boost gauge. Check how the car is currently running on the current ecu and tune.
Returning to the stock ecu means going through the harness and injectors to make sure everything works. No need to fix it if it isn't broken?
#16
Senior Member
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One cold night in late November of 2006
Fairfax on ramp to I-10 West, satisfiable entry to throttle all the way open.
Glanced at my boost gauge as the secondary kicked in and it was over 1 bar, immediately let off and still managed to chip a tiny piece of the apex seal.
This was on Bonez high flow cat with RB catback, nothing else as far as power is related.
You don't want that feeling and scream Mamma mia, O dios inside your FC.
I'd leave the adaptronic(much much faster than 2? bit chip ecu from 88), get a wideband like mentioned and port the wastegate as well.
Fairfax on ramp to I-10 West, satisfiable entry to throttle all the way open.
Glanced at my boost gauge as the secondary kicked in and it was over 1 bar, immediately let off and still managed to chip a tiny piece of the apex seal.
This was on Bonez high flow cat with RB catback, nothing else as far as power is related.
You don't want that feeling and scream Mamma mia, O dios inside your FC.
I'd leave the adaptronic(much much faster than 2? bit chip ecu from 88), get a wideband like mentioned and port the wastegate as well.
#17
Junior Member
Thread Starter
One cold night in late November of 2006
Fairfax on ramp to I-10 West, satisfiable entry to throttle all the way open.
Glanced at my boost gauge as the secondary kicked in and it was over 1 bar, immediately let off and still managed to chip a tiny piece of the apex seal.
This was on Bonez high flow cat with RB catback, nothing else as far as power is related.
You don't want that feeling and scream Mamma mia, O dios inside your FC.
I'd leave the adaptronic(much much faster than 2? bit chip ecu from 88), get a wideband like mentioned and port the wastegate as well.
Fairfax on ramp to I-10 West, satisfiable entry to throttle all the way open.
Glanced at my boost gauge as the secondary kicked in and it was over 1 bar, immediately let off and still managed to chip a tiny piece of the apex seal.
This was on Bonez high flow cat with RB catback, nothing else as far as power is related.
You don't want that feeling and scream Mamma mia, O dios inside your FC.
I'd leave the adaptronic(much much faster than 2? bit chip ecu from 88), get a wideband like mentioned and port the wastegate as well.
the current tune run at 1.1bar and also don’t burn a lot of the fuel. I already try to start the engine with the stock ecu and stock intake and it seems to run well (i check for the wire and they are in the original position the previous owner only change the o2sensor and water temp sensor; the injectors are stock)
I already have defi pressure gauge, exhaust temp gauge and water temp idicator.
The most important aspect for me is to preserve the engine and if i run it at 1.1bar I'm not doing a good job.(I also have the sohn kit).
I’m open to al the solution
Thank you all
Last edited by Sicko-21; 03-11-22 at 02:36 AM.
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