08-02-2007, 05:38 AM
Hi there!
I thought this could be interesting for all of us to know so I started this new topic...
As you all know I am always looking for a possibility to get more power out of the 968. Everyboby knows that you will bite out your teeth trying to find some more power in this engine; A free-flowing exhaust will give you better response and more torque down low but not a significant gain up high, Airbox mods can be done but not done the right way will suffer from the engines heat and due to the lack of the stock ram effect, cams probably can make some (very little) power but as I experianced often with deep dips in the midrange.
That is why I decided to go the SC-road.
As the kit is not here completly yet and I am dammed to wait for the rest of the parts I started playing around a bit with what I got.
I always wanted to make an experiment with E85 which should be known by most of you. The reasons are simple:
- Relativly simple way of conversion
- availability of E85
- Alternativ fuel made of wood in Switzerland
- 104- 105 Oktan as a principal base for higher power
Sure the car would not only have to run on E85 but it should also make more power...
As I am a Medical Doc I have to take the tools I have to make all work. I sure know having full access on the 968's ecu would allow me to get out even better results, but I aint got it. But I did what I could all on my own...
- Installed the APEXi NEO
- Installed the big injetors of the SC kit
- installed a wide band sond
- filled up the tank with E85
- went for testrides, tuning and messuring with the GTech Pro RR
As I took bigger injectors I had to correkt the signal of the AFM down which indirectly makes the ecu fire more advanced ignition which goes in the direction of using the potential of the 104 octanes...
To get to the point:
The car now runs on E85 with no problems for some 600mls. Only thing, the car now no longer smells of gas but more direction wiskey..;-).
I was able to get out some more power as you see in the attached file of the torque curves of gas vs E85.
IMPORTANT: the units and the absolut hight of the values is complitly irrelevant, it is the difference of the two curves that matters!
The car feels more responsive, pulls stronger from over the whole band, especially above 3000rpm. The sound ov the engine is harder due to the indirectly advanced ignition. And most important, the car is faster!
- From 30 - 100km/h (about 18.6 - 62mls) in second gear 0.3 seconds faster
- From 40 - 140km/h (about 24.8 - 86.8mls) in third gear 0.5 seconds faster
This is not bad in my eyes for a homemade conversion and tuning...
As the SC conversion is still to come I will also try with the E85 and I am sure the car will love it...
So then, to be continued...
Best regards
Andi Kunz
I thought this could be interesting for all of us to know so I started this new topic...
As you all know I am always looking for a possibility to get more power out of the 968. Everyboby knows that you will bite out your teeth trying to find some more power in this engine; A free-flowing exhaust will give you better response and more torque down low but not a significant gain up high, Airbox mods can be done but not done the right way will suffer from the engines heat and due to the lack of the stock ram effect, cams probably can make some (very little) power but as I experianced often with deep dips in the midrange.
That is why I decided to go the SC-road.
As the kit is not here completly yet and I am dammed to wait for the rest of the parts I started playing around a bit with what I got.
I always wanted to make an experiment with E85 which should be known by most of you. The reasons are simple:
- Relativly simple way of conversion
- availability of E85
- Alternativ fuel made of wood in Switzerland
- 104- 105 Oktan as a principal base for higher power
Sure the car would not only have to run on E85 but it should also make more power...
As I am a Medical Doc I have to take the tools I have to make all work. I sure know having full access on the 968's ecu would allow me to get out even better results, but I aint got it. But I did what I could all on my own...
- Installed the APEXi NEO
- Installed the big injetors of the SC kit
- installed a wide band sond
- filled up the tank with E85
- went for testrides, tuning and messuring with the GTech Pro RR
As I took bigger injectors I had to correkt the signal of the AFM down which indirectly makes the ecu fire more advanced ignition which goes in the direction of using the potential of the 104 octanes...
To get to the point:
The car now runs on E85 with no problems for some 600mls. Only thing, the car now no longer smells of gas but more direction wiskey..;-).
I was able to get out some more power as you see in the attached file of the torque curves of gas vs E85.
IMPORTANT: the units and the absolut hight of the values is complitly irrelevant, it is the difference of the two curves that matters!
The car feels more responsive, pulls stronger from over the whole band, especially above 3000rpm. The sound ov the engine is harder due to the indirectly advanced ignition. And most important, the car is faster!
- From 30 - 100km/h (about 18.6 - 62mls) in second gear 0.3 seconds faster
- From 40 - 140km/h (about 24.8 - 86.8mls) in third gear 0.5 seconds faster
This is not bad in my eyes for a homemade conversion and tuning...
As the SC conversion is still to come I will also try with the E85 and I am sure the car will love it...
So then, to be continued...
Best regards
Andi Kunz
