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-   -   911 sc 3.6 to 3.8 engine rebuild thread (http://forums.pelicanparts.com/911-engine-rebuilding-forum/1153713-911-sc-3-6-3-8-engine-rebuild-thread.html)

mikedsilva 05-10-2025 03:23 PM
Quote:
Originally Posted by -Levi- (Post 12462613)

As far as AFR go, we are mid to low 13s to high 12’s depending on the exhaust setting and rpm.
Would these numbers be sufficient to drive the car as is on the street and Drivers Events?
Looking at your lambda graph, I think you'll be fine. I'd be comfortable with this.

Bastin 05-12-2025 09:14 AM
I'm interested in exploring options for integrating an aftermarket ECU with a Varioram setup. What solutions or approaches are available?

-Levi- 05-16-2025 08:55 PM
Bump, anyone else have any thoughts?

targa72e 05-17-2025 10:37 AM
Based on the data provided I would say the red line is borderline OK. The Blue line is too lean.
General guidelines

12.2 AFR - Safe Best Power at Wide Open Throttle (WOT)
13.3 AFR - Lean Best Torque.
14.6 AFR - Stoichimometirc Air/Fuel Ratio Value (Stoich)
15.5 AFR - Lean Cruise.
16.5 AFR - Usual Best Economy.

I think you would want closer to 12.5 at wide open throttle. You might also want to try measuring your self with a wide band O2 sensor. Since the one a Dyno Pro is inserted in the tail pipe it is probably not as accurate as one screwed into the exhaust pipe.

john

-Levi- 05-20-2025 06:25 AM
Quote:
Originally Posted by targa72e (Post 12466406)
Based on the data provided I would say the red line is borderline OK. The Blue line is too lean.
General guidelines

12.2 AFR - Safe Best Power at Wide Open Throttle (WOT)
13.3 AFR - Lean Best Torque.
14.6 AFR - Stoichimometirc Air/Fuel Ratio Value (Stoich)
15.5 AFR - Lean Cruise.
16.5 AFR - Usual Best Economy.

I think you would want closer to 12.5 at wide open throttle. You might also want to try measuring your self with a wide band O2 sensor. Since the one a Dyno Pro is inserted in the tail pipe it is probably not as accurate as one screwed into the exhaust pipe.

john
Thank you,
I am running a dual wideband, one on each side and they match the dyno AFR.


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