Self designed Missing link
 

Okay I just finished my design and testing of a missing link. SO no more fishtank valves, and no more CEL. It was designed my 1993 Civic MAP sensor, easy to install.It looks like ass right now but it is small bout 2 cm by 3 cm so you can hide it. Everyone is gonna ask for pics, but I am not gonna post pics up until I am done making some kind of case for it.

Built using purely passive analog components it will probally never ---- up. Anyways how much do you guys think it is worth? any ideas of how to sell them? I will donate a portion of sales to HMT of course. BTW do you guys really care how it looks since once you install it you never need to ---- with it and because of its size you can hide it anywhere in your engine bay.

I am still in the proccess of designing my AFC and my electronic boost controller.

Re:Self designed Missing link
 

Someone made something similar to what i think you built, it just limits the voltage that the map sensor is able to send to the computer, so it will never see over 0 psi or 3.2 volts or something. I think it was adjustable too, so you could use it on different map sensors on different cars. i think it was pretty expensive, so hopefully your design is more economical for the HMT user.

Re:Self designed Missing link
 

BTW are any of the mods here interested in testing my units for free. I wanna send out a few units for some well respected memebers here to test. All I want is an unbiased opinion as to if my units are any good and worth the money.

right now my unit limits are at 2.75 volts, i can make it adjustable but that would just add to the cost of the unit. besides 2.75 volts should work for most hondas.

Hey guys please give me suggestions for a price range. I will start with 25 bucks USD. Honestly my design is low cost and I made sure it would be super reliable. The cost i charge is not really for the parts but for the time and hassle of making them, After all is said and done it would probally take 1 hour to make a unit and ship it out, after parts are factored in, I would probally make the same amount on a per hour basis as I would my regular day job. Anyways I am not looking to make a killing on this stuff, I just want to offer good products are great prices.

Re:Self designed Missing link
 

most if not all of the mods here don't need a missing link.

Re:Self designed Missing link
 

when I do homemade turbo crap I like to do it in my home, not have you do it in your home then buy it from you. why don't you just share your knowledge on how to make this with the few people who still use fmus.

Re:Self designed Missing link
 

seriously, most of the people here, including myself only use the fmu for a little bit and then move on to something better.

Re:Self designed Missing link
 

word, i know money is good and all, but that's what Ebay is for, knowledge should be free.

Re:Self designed Missing link
 

im sure even after knowing how to do it...there will still be people who would rather just pay

Re:Self designed Missing link
 

yeah but if you mount it youll notice that when you accelerate, your car will have a lack of fuel.
There was such a thread sometimes before.
MAde by myself.
wait ill just go and look in the search ;)

Re:Self designed Missing link
 

her is the thread.
https://www.homemadeturbo.com/forum/...3619#msg103619

sorry but the picture doesnt work anymore.

look the way HMT guys laughed at my idea

Re:Self designed Missing link
 

yes, but those people typically aren't found on HMt.

Yes, I got quoted, my life is complete.

Re:Self designed Missing link
 

Mush easier to make a FCD.
I've built one for myself... parts are ~5US$.

Here's link for schematics:
http://www.teamfc3s.org/info/articles/fcd/diy_fcd.htm

And here's a pic of my built FCD (tho only 4 wires are needed - gnd, +12V, MAP in, MAP out).

http://tp1.irb.hr/~nfrances/fcd/FCD.jpg

Re:Self designed Missing link
 

Build me one, ill pay you 25 bucks :-)

Re:Self designed Missing link
 

thats a good advice
ill try to build one for fun ;D

Re:Self designed Missing link
 

Heh... too lazy, belive it or not :)
Already few people asked me here to make 'em A/F gauges (also built it myself for under 10US$), but again.. too lazy :)

Re:Self designed Missing link
 

do you have any pictures and a parts list of the af gauge?

Re:Self designed Missing link
 

I've made it according to this schematics:
http://scirocco.dyndns.org/tech/misc/afgauge/af.html

Here's pic of boards I made (both for A/F meter and FCD) - I've put them in an empty casette box, which is now set by ECU as there was some free space there.

http://tp1.irb.hr/~nfrances/boards.jpg

Also, here's pic of A/F gauge, and temp/boost gauge that I've made:

http://tp1.irb.hr/~nfrances/instruments.jpg

Re:Self designed Missing link
 

Neat, I also made an A/F meter, used 2 LM3914 ICs to drive 10 leds (red, yellow and green) in a non-linear fashion (higher resolution for the upper and lower part of the voltage range because how nonlinear these O2 sensors are. The first and last 4 leds increment in 0.05V steps and the 2 middle leds have som e bigger steps.

btw, your site doesn't work
While trying to retrieve the URL: http://scirocco.dyndns.org/tech/misc/afgauge/af.html

The following error was encountered:

* Connection Failed

The system returned:

(60) Operation timed out

Re:Self designed Missing link
 

alright if you guys wanna make an easy missing link then I will send over the wire diagram,. it is much simpler than what is posted, 2 resistors and a diode, about 10 cents of materials and just a few soldiering points. however with this mod is purely intended for use with a FMU or any system that does not depend on the map sensor reading.

5v----->3kresistot------->diode----->Map snsr and ECU
------->2k resistor--------->ground

hard to show the connections with ascii characters, i will post up a diagram if you guys want.

salut

Alan To

Re:Self designed Missing link
 

I prefer schematic I posted.... with LM358. Still cheap, you can adjust it, and you're shure it wont screw up signal due to very high input resistance as opposed to what you'we wrote here (only few kohm in yr case - this might alter signal).

Re:Self designed Missing link
 

I probably know this but just can't think of it right now, but what is an fcd?

Re:Self designed Missing link
 

just change the 2k to 200k and the 3k to 300k, as long as the ratio stays the same. besides at most you are pulling like 5ma even with the 2k and 3k resistors. I used the 2 and 3 k and it worked like a charm, besides with my ghetto design you do want to alter the map signal to a max of 2.75v. In the end it works fine atleast for my car, if you want to adjust swap the resistors with variable resistors and adjust. Not exactly textbook perfect but works in the real world, besides if people wanna use something like this they are content with not throwing out a CEL, which this thing does perfectly fine. if people are really concerned then you can use 2 inverting op amps, which I have used before and worked like a charm. the 2 opamps with adjustable gain would be more of a textbook solution but then again it is more of a hassle to work with.

Re:Self designed Missing link
 

Damn toolean, your always tweaking on some new invention. i hope you dont try meth, because you would be up for days working on this stuff. looks interesting.