Designing Microcontrolled Booster...Need feedback

[aliazhar]

Hello all...

ok, here's what i am working on and i need your feedback on this...

i am designing a device which can give 5 to 15 horse power increase....
this device will control, basically, intake temperature controller but, not by fixing it with some resistor....it will use the same temperature sensor and add or decrease the values using a microcontroller.

this device can be set on automatic or manual control and will also give better milage - incase you dont need the boost.

equiped with a display for displaying the input and output data, it will show the power increase in real-time.

i need your opinions/suggesions/feeback on this project i am working on...

please give the best in your mind .

Thanks and Best Regards

[cadgear]

Well, there's a two-sided issue.

If you drop the IAT's signal, the PCM sees this and adjusts Air-Fuel ratio. Unfortunately, once the O2 sensor gives the PCM feedback on the rich condition, the PCM cuts back on fuel delivery and puts less importance on the IAT sensor's input.

If you want to tune your car, best bet is going out and grabbing an ODB I car and going from there. The ODB II cars are more expensive to trick into behaving how you want, and there's always the "must pass emissions" junk (if your area has such a mandate).

Something as simple as a pot connected in place of (or have a DPDT switch to control which input to use) the IAT would change the PCMs view on intake charge temperature, but as was said, once the O2 sensor gives feedback the PCM blinks and goes by what the O2 says - after all, its the emissions the PCM is trying to regulate, not the horsepower.

[aliazhar]

you are absolutly right....i did'nt said that i am skipping the temperature part in my device....i forgot to mention that i do have a temperature sensor in it. the microcontroller give the resistance to the pcm according to the digital temperature read-out which makes it a lot more precise...and incase if you want the boost, then the same temperature is used with +/- values which are still fluctuating according to the air temperature.

the whole point in this is giving the car right reading in normal driving and if some one wants to boost it, then also the values will not be static...it will be divided according to the temperature outside...
in the long run, for normal driving, there will be a better MPG and in the boost, there wont be a fixed reading.

your point of o2 sensor is also right, i can hook the o2 sensor line to my device too....which can keep the pcm getting the right values for emission. in other words, the pcm from both side will keep the right values and will not re-adjust itself.

in other words, what i am mentioning here is a type of complete stable solution for boosting or for normal driving. the benifits for normal drivings will be precise reading which will give better mileage per gas used and for people who wants to over-ride to boost will give precise boosting.

using a microcontroller is the best bet to keep the pcm working precisly. it will work like a daughter board on a PCM unit.

Let me know more if any of you got any comments.

Best Regards

[cadgear]

Sounds to me like you're planning on getting pretty deep into the electronics of this thing. A heated O2 sensor alone is something to the left of magic to me. You might want to head on over to 60degreeV6.com and post your plans on their forums. Those guys have a lot of info for the pushrod and OHC engines, both ODB I and II, swaps, myths, and pretty much anything else you could want. Very performence-oriented with good info on how to squeeze every last horse out of your motor...and have the driveline to handle it.

[aliazhar]

i am - by profession a 3D-Artist, and my hobby is digital circuit designing and microcontroller programming...
my car is - the way i take it - is a sophisticated computer.

o2 sensor data is much more easier to understand and produce with increament/decrement then producing temperature data for PCM.

the reason is that o2 sensor is voltage data, and temperature sensors are resistance data which is processed by PCM.

i will still give a bit more time to this thread coz there are few more genius people like jeffcoslacker, whome i really want to give feedback to this thread among the rest of genius people in this forum.

if there are more thoughts about this you got, then i will be really glad to incorporate and or answer for my design.

Thanks and Best Regards

[Fulkrum]

If you can make it invisible so the BAR-slaves at the smog shop can't see it, that'd be a definite plus.

:-)

[tblake]

If you take into account all the sensor data, O2, iat, map, you should be able to tell the computer to give the engine more fuel. Keep in mind that there are 2 O2 sensors on your lumina if it has OBD2, and that running a car real rich isnt good for it either. In fact OBD2 cars are way more intelligent than you think. If you increase the volume of air entering (lower temperature, or increase velocity) the computer actually sees that, and knows that it can send in a lot more fuel. So in a nutshell, if your car is OBD2, you would be better off just buing a cold air intake kit on ebay, or like I was thinking about routing my own. Jeffcoslacker has gone into very good detail on this topic in a coupld forums herer, one is simply called "tornado", and there is another that deeps very far in depth with intake and exhaust, if I find it, I'll post it, but look around. One thing I would look at first is just simply buying a jet chip, maybe try summit racing's web page. that is kind of what you are trying to make yourself. But if you do decided to go ahead and try this, make sure its something you can undo. and report back with how it all turned out.