Dave,

Sounds good! Were you able to find all the parts at Rat Shack? One question: Why do you want to mount it close to the ECU? It seems that would be pretty tough considering the ECU's location in the car. The "board" itself will probably be no bigger that 1" x 1" and can easily be mounted "in-line". The only external wiring necessary at that point would be a +12v tap for the voltage follower.

-koejing

 

Stan, I appreciate your point, but the car stereo will be guaranteed to play music, it

 

>>However, from a pure business stand point, I can not appreciate paying full retail when there

 

E30M3-

you're missing some of the point - these guys like messing around with this, it's fun.

Plus, RT already agreed with my post about comptech providing the final fix (at no cost to us) whether it is something they come up with or something they adopt that this gang has done.

 

Stan, like I said, I hear you!

I'm just not ready to start drawing lines in the sand with Comptech yet.
They are still working the problem and haven't shown any signs of their intentions to let anyone dangle in the breeze.

As in my real life (non-S2000 related), I'm personally not content with waiting for things to develop in a serial fashion (parallel multi-tasking baby). So if others want to participate in my parallel search, and if Comptech reaps any side benefits, great, maybe they

 

Round 2:

I have modified the voltage follower circuit to run off the native +5v supply provided by the car. Now this is truly an "in-line" solution. Here is the revised schem:



-koejing

 

>>you're missing some of the point - these guys like messing around with this, it's fun. <<

It sure is!!! I'm always messing around with stuff.

>>Stan, like I said, I hear you! I'm just not ready to start drawing lines in the sand with Comptech yet.
They are still working the problem and haven't shown any signs of their intentions to let anyone dangle in the breeze. <<

Just giving ya a sorta hard time...keep up your efforts they will pay off one way or another. Now you see why (when possible) a mod such as a SC should include ECU efforts. This can get real complicated with OBD2 and self learning ECUs!! If the ECU could be tuned to comfortably deal with the SC, I would not be surprised if additional power and response could be realized. By tuned I mean no black boxes, check valves simply some software/hardware/sensor efforts to allow boost pressure to be measured and dealt with. In that case, the existing MAP sensor would be swapped with one designed to handle boost. Cars with lots of add-on black boxes and piggy back devices get real complicated and often leave some performamce on the table.

Stan

 

Stan Agreed!
An interesting thing about the current MAP sensor is that it doesn't seem to break down when it sees boost just the ECM gets pissed. In playing with it, non-scientifically of course, the thing looked like it might stay linear to 10 maybe 12 psi.
If that

 

koejing, is the pull up resistor sufficient to allow the LM358 to go rail to rail? as it turns out I already put the circuit together earlier today, but i used a 12v supply for the LM358... do you think i still need the pullup resistor? Or should I change it to 5v like you have in the new schem?

 

Dave,

The pullup resistor will allow the output of the LM358 to come within 0.4v of rail (~4.6v). The problem with using a +12v supply is that the voltage follower has the ability to output up to +10v. In the event of a malfunction/catastrophic event, +10v could potentially show up on that line and cause "bad things" to happen to the ECU. The pullup solution just adds a measure of protection, by ensuring the output will never exceed +5v.

-koejing