LH Piggyback
01-07-2005, 12:54 AM
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LH Piggyback
I have been following a forum thread for my motorcycle regarding the PC III piggyback for fine-tuning the fuel mixture map for modifications to the intake and exhaust systems. I have just receive my LM-1 system and am going to use it for the bike re-map and to tune the S/C that Andy has "in the mail" to me at this moment. I posted to the bike forum lamenting the lack of something like the PC III for out LH ECU. Here's a response from one of the more knowledgable contributors:
___________________________________________
My post:
I am currently in the throes of adding an Auto-Rotor twin-screw supercharger to my Porsche 928. The way we are remapping the fuel distribution is by using a rising-rate fuel pressure regulator. The LM-1 tells us that this strategy is working pretty well generally, but there are a couple of caveats to that. In particular, we often see a throttle tip-in lean condition for a few seconds on rapid tip-in. If we had a piggy-back unit like the PC III we could remap that bit quite easily. Are you aware of any such unit applicable to the Bosch LM EUC?
______________
Response:
You could use a PCIII with a MAP sensor connected to the TPS input.
Another option is a little piggy-back computer that I make. Here are a few details.
My piggy-back works the same way as a PCIII, it needs to be wired between the ECU and injectors.
It has a TPS map for each cylinder and a boost map.
It also has some extra output drivers so it can control an electronic pop-off valve to vent the plenum when the throttle is closed.
The box has an input for a wide band input. The LM1 can be setup to generate an output voltage that the piggy-back can process.
The piggy-back can log throttle position, Boost, RPM, Air/Fuel ratio and trim value at a rate of 100 samples per second. This does require a laptop to be connected at the time but it makes the tuning process much easier.
You won't find any details on my web page because I want to add some more features before I start to try and push the product.
I have been using it on my Turbo Triumph for about 40,000km without a problem.
It is also used on Supercharged Harley kits in the USA, about 40 units are running on bikes to date.
I sell this piggy-back for $320 US.
The code in the box can be reflashed as I add new features.
Let me know if you want more details.
___________________________________________
My post:
I am currently in the throes of adding an Auto-Rotor twin-screw supercharger to my Porsche 928. The way we are remapping the fuel distribution is by using a rising-rate fuel pressure regulator. The LM-1 tells us that this strategy is working pretty well generally, but there are a couple of caveats to that. In particular, we often see a throttle tip-in lean condition for a few seconds on rapid tip-in. If we had a piggy-back unit like the PC III we could remap that bit quite easily. Are you aware of any such unit applicable to the Bosch LM EUC?
______________
Response:
You could use a PCIII with a MAP sensor connected to the TPS input.
Another option is a little piggy-back computer that I make. Here are a few details.
My piggy-back works the same way as a PCIII, it needs to be wired between the ECU and injectors.
It has a TPS map for each cylinder and a boost map.
It also has some extra output drivers so it can control an electronic pop-off valve to vent the plenum when the throttle is closed.
The box has an input for a wide band input. The LM1 can be setup to generate an output voltage that the piggy-back can process.
The piggy-back can log throttle position, Boost, RPM, Air/Fuel ratio and trim value at a rate of 100 samples per second. This does require a laptop to be connected at the time but it makes the tuning process much easier.
You won't find any details on my web page because I want to add some more features before I start to try and push the product.
I have been using it on my Turbo Triumph for about 40,000km without a problem.
It is also used on Supercharged Harley kits in the USA, about 40 units are running on bikes to date.
I sell this piggy-back for $320 US.
The code in the box can be reflashed as I add new features.
Let me know if you want more details.
01-07-2005, 10:12 AM
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Brian,
Sounds interesting. Have you considered the SMT-6? mspiegle is currently running one on his 86.5. Loius Ott sells them with wiring digrams and settings for the 32V 928. I believe that th price is very competitive too. http://www.perfectpower.com/products/smt6.asp
http://www.performance928.com/cgi-bi...cgi?form_id=27
This is not the case at all. If anything it has been just the opposite with the 85-86 cars.
Andy K
Sounds interesting. Have you considered the SMT-6? mspiegle is currently running one on his 86.5. Loius Ott sells them with wiring digrams and settings for the 32V 928. I believe that th price is very competitive too. http://www.perfectpower.com/products/smt6.asp
http://www.performance928.com/cgi-bi...cgi?form_id=27
In particular, we often see a throttle tip-in lean condition for a few seconds on rapid tip-in.
Andy K