Homemade Map Clamp

[Bravnik]

OK so I see no reason to pay $17 or $60+ dollars for something I can make for a few bucks. So I did a little research, found what I was looking for and I will now share it with everyone.



The Diode Part Number is for 50 so I suggest using part number 276-1122 for the 10 Diode pack.

I plan to build this myself and install it this weekend. I hope others get use out of this as well.

 

[Bravnik]

I made this yesterday. Cost about $10 and took all of 10m to make. I used a 5v source to preset the Map to 3.7V so all I should have to do now is connect it to the car and go.

 

[shaodome]

So again....why not just use a Zener Diode of a value near 3.7v? I mean they cost even less and are even more simple...granted, $10 is not a lot of money by anymeans....

I have asked it a few times as to why not just use a zener?

 

[Bravnik]

Basically you could do this and I thought about it as well. I just like the ability to adjust it and not set it at a fixed rate.

But you're 100% right as you could easly do that. Hell you could even get a little more imaginative and have 3 ZD's for preset boost levels (that the car sees) like 10PSI, 15PSI and 18PSI with a switch to switch between them (On / off / On). If you would like the car to see boost closest to your current boost and you had a EBC/MBC that had mulitple stages, this would be a great idea.

 

[shaodome]

From a few posts I've read on this forum the MAP sensor has zero affect on fueling or ignition timing, so I still don't see the benefit of an adjustable MAP Clamp. Whether that is 100% true or not would very much affect the outcome of this discussion.

Because no matter what the boost level was, as soon as the MAP sensor reached the ZENER rating, all the additional voltage (capped at 5v) would just be bled of to ground anyways.

 

[Jays07MS3]

From a few posts I've read on this forum the MAP sensor has zero affect on fueling or ignition timing, so I still don't see the benefit of an adjustable MAP Clamp. Whether that is 100% true or not would very much affect the outcome of this discussion.

Because no matter what the boost level was, as soon as the MAP sensor reached the ZENER rating, all the additional voltage (capped at 5v) would just be bled of to ground anyways.

Some people are getting boost cut at different ambient temps and different clamp values so they've had to adjust theirs down. I would prefer an adjustable clamp vs. preset one. You never quite know how your car is going to react. Plus this is only $10. If someone can't afford that they shouldn't be modding their car

 

[shaodome]

Some people are getting boost cut at different ambient temps and different clamp values so they've had to adjust theirs down. I would prefer an adjustable clamp vs. preset one. You never quite know how your car is going to react. Plus this is only $10. If someone can't afford that they shouldn't be modding their car

Agreed on the modding car statement....I'm not a fan of the whole map clamp thing anyways...

I'll wait for a fully tunable solution to hit the market. The Standback is nice, but I want to see what full throttle control will bring. I come from Megasquirt land and I'm used to tuning cars (I've done A LOT) from the ground up.

Still...$10...nice (second)

 

[Jays07MS3]

Agreed on the modding car statement....I'm not a fan of the whole map clamp thing anyways...

I'll wait for a fully tunable solution to hit the market. The Standback is nice, but I want to see what full throttle control will bring. I come from Megasquirt land and I'm used to tuning cars (I've done A LOT) from the ground up.

Still...$10...nice (second)

I agree 100%. I'm in the same boat. I'm really hoping Cobb with come through with full throttle control. I'm not too keen either on tricking the ECU into reading false signals.

 

[samsel450r]

i made my own to.. but i cant figure out how to set it cause i dont have a dash hawk all i have is a volt meter..

 

[dadasracecar]

Some people are getting boost cut at different ambient temps and different clamp values so they've had to adjust theirs down. I would prefer an adjustable clamp vs. preset one. You never quite know how your car is going to react. Plus this is only $10. If someone can't afford that they shouldn't be modding their car

In this case they should clamp the IAT in the MAF, aka the cp-e winter fuel cut fix. Works like a charm and doesn't affect afr and timing - I've datalogged this to death. The car most likely uses the IAT in the MAP sensor. That's the one I'd use to calc. air density for obvious reasons.