Turbo downstream from catalytic converter
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- Posts: 303
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- Location: Sacramento CA
- Vehicle Information: 1991 F150 4.9L J1X 80lb Injectors E85
1995 F150 5.8L MOB1
Turbo downstream from catalytic converter
Seem like a bad idea? Not trying to build a drag car just looking to add some HP for towing on my 300 Inline 6 1-4k rpm. Pulled some inspiration from here: https://www.youtube.com/watch?v=SZoV6E5DDXI
Living in California wanting to install a turbo that could be easily removed for bi-annual inspection.
Any thoughts?
Living in California wanting to install a turbo that could be easily removed for bi-annual inspection.
Any thoughts?
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- Location: Metairie, LA
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'19 F-150 3.3L
Re: Turbo downstream from catalytic converter
cats wont last long and youll have bad turbo lag and youd have no afr feedback as o2s cant work
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- Posts: 303
- Joined: 2021 Feb 15, 22:12
- Location: Sacramento CA
- Vehicle Information: 1991 F150 4.9L J1X 80lb Injectors E85
1995 F150 5.8L MOB1
Re: Turbo downstream from catalytic converter
Ahh O2s have to be downstream from the turbo. That makes sense thanks. So I'll basically build a complete straight pipe turbo system and tear it all off every two years.
On the tuning side of things, is it as simple as scaling spark and VE table to load beyond 1?
On the tuning side of things, is it as simple as scaling spark and VE table to load beyond 1?
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- Posts: 5085
- Joined: 2021 Feb 15, 12:23
- Location: Metairie, LA
- Vehicle Information: Work Truck
'19 F-150 3.3L
Re: Turbo downstream from catalytic converter
not on the old speed density stuff. Under boost those old map sensors go from reporting 0 vac to full vac so youd have to create a new alpha-N ve table to use in boost. Not ideal with a turbo since the relations between throttle and load are not linear with turbos but it would be the easiest method.
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- Posts: 303
- Joined: 2021 Feb 15, 22:12
- Location: Sacramento CA
- Vehicle Information: 1991 F150 4.9L J1X 80lb Injectors E85
1995 F150 5.8L MOB1
Re: Turbo downstream from catalytic converter
That's too bad. Is a aftermarket map sensor out of the question? Better to just do a MAF conversion?
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- Posts: 5085
- Joined: 2021 Feb 15, 12:23
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'19 F-150 3.3L
Re: Turbo downstream from catalytic converter
u can make anything work
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- Posts: 303
- Joined: 2021 Feb 15, 22:12
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- Vehicle Information: 1991 F150 4.9L J1X 80lb Injectors E85
1995 F150 5.8L MOB1
Re: Turbo downstream from catalytic converter
I found this old post. Did you ever find a 2 or 3 bar MAP with frequency output?
https://eectuning.org/forums/viewtopic. ... sor#p82099
https://eectuning.org/forums/viewtopic. ... sor#p82099
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Re: Turbo downstream from catalytic converter
Escort Cosworth MAP is 2.5bar.
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Re: Turbo downstream from catalytic converter
You could install a test pipe in place of the cat when using the turbo. Keep it free of any exhaust leaks and possibly use header wrap to hold in some of the heat. Use a small turbo and it might be worth it.
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- Posts: 303
- Joined: 2021 Feb 15, 22:12
- Location: Sacramento CA
- Vehicle Information: 1991 F150 4.9L J1X 80lb Injectors E85
1995 F150 5.8L MOB1
Re: Turbo downstream from catalytic converter
Nice info thanks guys. Looks like china even makes a cosworth map sensor now:
https://rover.ebay.com/rover/0/0/0?mpre ... 1133741848
Would this work? Simple as adjusting FN324?
https://rover.ebay.com/rover/0/0/0?mpre ... 1133741848
Would this work? Simple as adjusting FN324?