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TDI Power Enhancements Discussions about increasing the power of your TDI engine. i.e. chips, injectors, powerboxes, clutches, etc. Handling, suspensions, wheels, type discussion should be put into the "Upgrades (non TDI Engine related)" forum. Non TDI vehicle related postings will be moved or removed. Please note the Performance Disclaimer.

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Old September 18th, 2006, 20:26   #1
jackbombay
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Default HOW TO tamper with the fuel temp sensor like KERMA

For more info on what this mod does see the thread Kerma started about it here.

Since we got our first snow of the season I figured it was time to fake out the ECU to think my fuel is extra cool.



I bought a pack of 2200 ohm resistors from Radio shack, they were $.99,



I started by cutting the tape back on the wiring harness where it attaches to the injection pump,



Here is the wire I used, yellow with blue stripe, #7, it is quite thin like much of the wiring under the hood,


Oh yea, it's a lot easier to do this if you remove the vaccum resevoir, two 6 mm allen bolts.

First I cut it and tried to just push the thin wire of the resistor into the wiring insulation, but that was not going to happen, maybe if it was 90* + out, but it wasn't. So I soldered it in, I'm not sure hot hot resistors can get so I did the soldering as fast as I could,



I then coverd it all up with liquid electrical tape,



Here is the first coat, I'll put on a second coat tommorow,



before resistor fuel temp reported in VAG-COM was 16.2* C after the resistor it is 2.7* C

BEST FUEL COOLER EVER

You can see on the right side of the screen the coolant is 16.2* C the car hasn't run since yesterday,


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Old September 18th, 2006, 20:42   #2
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I had to go out and compare! I get 7.2*C for the fuel temp and 22.6*C for the coolant temp (car has not run today either). Your how-to is great Jack. My IAT was reading 5.9*C That is a cheap intercooler too
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Old September 18th, 2006, 22:20   #3
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what is the advantage of the computer thinking the fuel is cooler? wouldnt it inject less as cooler fuel is thicker?
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Old September 18th, 2006, 22:47   #4
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When fuel gets hot injection timing is retarded which raises EGT and lowers efficiency and power.
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Old September 19th, 2006, 00:19   #5
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Nice mod. You really want that much difference? Seems a bit much. I'd think a little less would be better but then again I am only learning.

Hey! where are you located? Is that Colorado? Snow! Nice!
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Old September 19th, 2006, 00:21   #6
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would this be ok on my car? i can get what ever resistiors i need from work today do you notice a power increase?

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Old September 19th, 2006, 06:55   #7
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I'm in south east Idaho, to quote an old farmer here "we've missed a few summers but we've never missed a winter."

I've only ben on a sort drive so far,the car didn't even fully warm up, after a longer drive where the fuel really warms up I think this mod should keep you from losing power due to retarded injection timing, I'm thinking it'll help MPG more than power.
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Old September 19th, 2006, 07:14   #8
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Now it just needs a catchy name........!!!!! You know, ventectomy, evry, etc.....

Come up with a few and run a poll.
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Old September 19th, 2006, 07:25   #9
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KFC Mod

Kerma Fuel Cooler Mod
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Old September 19th, 2006, 07:37   #10
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Oooooooh, that's good. The first one out of the bag might just be the winner.
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Old September 19th, 2006, 08:37   #11
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Hmmm.... this sounds pretty nice! So do chips not do this on there own?
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Old September 19th, 2006, 08:52   #12
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Quote:
Originally Posted by Slave2school
KFC Mod

Kerma Fuel Cooler Mod

haha yes
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Old September 19th, 2006, 09:33   #13
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that was my first thought. y couldn't a tuner reprogram the characteristics of the ecu to do the same thing?

Quote:
Originally Posted by fishmando
Hmmm.... this sounds pretty nice! So do chips not do this on there own?
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Old September 19th, 2006, 10:18   #14
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KFC Mod
That's got my vote!

Even if a chip can be made to duplicate the same results this mod would be great for those without a mod or with a tuning box. Since neither have the ability to tune it out. Excellent Mod.
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Old September 19th, 2006, 10:29   #15
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Hey Jack, did you do the Intake Air temp sensor as well?? If so, add those pics to your OP.

KFC Mod = Finger lickin' good!
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