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Discussion Starter #1 (Edited)
Sensor Pressure 3-Way Turbo Connection; Chipbox Install

I'm installing the Seletron Chipbox sold by Auto Ricambi today. Everything seems pretty straight forward and I have everything located and connected except what the instructions call PREX1 (to us, it's the sensor pressure 3-way turbo connection.)

The photo of this particular procedure is a bit nebulous; the only thing I'm sure of was that I disconnected the support as indicated but hunting around down there I cannot find a 3-way plug that will marry up with the Chipbox harness.

Any guesses?
 

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Discussion Starter #2
Well, with the help of Brett at AR I found this particular connection.
 
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I am glad I could help. Now, find some really small hands and connect it :)
 

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Discussion Starter #4
If only Brett. I can't imagine anyone could get to that buried connector from above, loosen the yellow locking slider, depress and pull on it.

So I jacked it up and came at it from the bottom. Had to use a shop pick to reach up and around it to loosen the yellow locking slider, easy enough. But when it came time to reach up and depress the black tab, then pull it... no go. Been at it over an hour. Due to the angle, I have to reach up and angle my body away and do this by Braille.

I call BS on the instructions saying it's a 30-60 minute job. If one was to come at it from the top and was left-handed ..... maybe.

Right now it's the monkey and the football and I'm feeling like the football.
 

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Discussion Starter #5 (Edited)
I'm glad to say the job is complete albeit a far cry from Seletron's estimate of 30-60 minutes.

In short, I jacked up the car to try and access 3-way sensor pressure from the bottom, even removing the metal pan for more visiual access but could not get them separate (keep in mind that the yellow slide mechanism and the black depress are all facing away from the bottom.)

Seems that those of us that have Abarths also have the front shock tower braces. To find and see this particular plug, one has to remove the rights side strut and disconnect a 1" conduit from the body and push it out of the way, get down to where your chin is on the front quarter panel, and there it.... barely.

In the end I reign supreme. Anyone attempting this and has questions from me, just PM.
 

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I'm guessing you are referring to the MAP sensor on the cold side intercooler pipe. Yes, that plug is VERY difficult to remove from the sensor, as experienced by folks installing the EC intercooler upgrade.
 

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Discussion Starter #7 (Edited)
I'm guessing you are referring to the MAP sensor on the cold side intercooler pipe. Yes, that plug is VERY difficult to remove from the sensor, as experienced by folks installing the EC intercooler upgrade.
LOL, I have no idea. Maybe Brett with jump in. In the end I eventually worked them apart from the top using a 9" slotted screwdriver but not before all of the other attempts described. I don't like forcing apart electrical connections.
 

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Could have been worse - taking a quick look at the install instructions it looks like it doesn't use the cam position sensor that is the bane of the Euro Drive Lite installers.

So we are all patiently awaiting your test drive impressions :)
 

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Discussion Starter #9
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So we are all patiently awaiting your test drive impressions
Give me a couple of days and I will report back. Took it out today and it pulled me back into the seat. A dyno will tell you the true numbers more than the seat of the pants. The good thing about the Chipbox is has a plug-in that returns the car to the normal mode. The best I can do it is get out onto the highway and do some quick accelerations to fourth gear and a stop watch in both modes.

I also run with a Valentine One radar detector; Barney is all over the place here.

More to follow.
 

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If only Brett. I can't imagine anyone could get to that buried connector from above, loosen the yellow locking slider, depress and pull on it.

So I jacked it up and came at it from the bottom. Had to use a shop pick to reach up and around it to loosen the yellow locking slider, easy enough. But when it came time to reach up and depress the black tab, then pull it... no go. Been at it over an hour. Due to the angle, I have to reach up and angle my body away and do this by Braille.

I call BS on the instructions saying it's a 30-60 minute job. If one was to come at it from the top and was left-handed ..... maybe.

Right now it's the monkey and the football and I'm feeling like the football.
Where is it located???
 

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Its on the cold side intercooler hose. The best way I get to it is pull the front passenger wheel and come in at it from that direction. It can be gotten to from the top side but a few things needs may need to be moved to get to it if you have larger hands like me.
 

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Brett...i can't find the location to the PREX1...Please advice.
Sorry for the delay, I have not been on here since Friday. Here is something that might help.

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I'm guessing you are referring to the MAP sensor on the cold side intercooler pipe. Yes, that plug is VERY difficult to remove from the sensor, as experienced by folks installing the EC intercooler upgrade.
Shark is right...I had a devil of a time removing mine during EC intercooler install...managed to pull a couple of the wires out of the connector...the repair involved removing the alternator to gain enough access to the plug and provide enough slack in the harness to actually repair the connector...a nightmare at best....care and patience is the key here....
 

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So this is a 2-way sensor while the Euro Drive Lite uses a 3-way sensor(Cam sensor which is the most difficult Sensor to reach) I have EDL and very happy, 3 sensors better then the 2.
 

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All I can say is.....what a pain in the ass to install the PREX1 sensor. I ended up taking it to a shop and having them do it after I was about to tear my hair out fiddling with this over an hour myself. I think a video that zooms in to the position where the sensor is would be super helpful.

Has anyone adjusted the settings of their ChipBox beyond the default? I'm not feeling a big difference.
 

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Remove passenger side tire and get under that side. I have big hands and I did it...it not easy buy it's durable. And once you get it done...your going to love the change. I installed the Chip Box and the Pedal Booster. Excellent!! Brett in AR thanks for recommending this combo. My recommendation clarify to instructions or include a SD card with live instructions.
 

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Got the Chipbox installed this past late fall without any drama. Installed the "hard to reach" plug by raising the car on the lift at a friend's shop and going from underneath. No need to remove anything. Just a little tight fit (I too have large hands). Total install time was about 45 minutes including several reads of the instructions. Result: In factory setting and sport mode on the console switch the rear of the car will break loose fairly easily in lower gears and my butt dyno says good improvement. I'll know more once it's wake the Spider up time here in the NE USA (after all the road salt has washed off the road surfaces) and I can drive it more than the short jaunts I had before storing away for winter. A+ item IMHO. I'll then add the pedal booster as I only make one change at a time so the effect of each can be assessed.
 

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Got the Chipbox installed this past late fall without any drama. Installed the "hard to reach" plug by raising the car on the lift at a friend's shop and going from underneath. No need to remove anything. Just a little tight fit (I too have large hands). Total install time was about 45 minutes including several reads of the instructions. Result: In factory setting and sport mode on the console switch the rear of the car will break loose fairly easily in lower gears and my butt dyno says good improvement. I'll know more once it's wake the Spider up time here in the NE USA (after all the road salt has washed off the road surfaces) and I can drive it more than the short jaunts I had before storing away for winter. A+ item IMHO. I'll then add the pedal booster as I only make one change at a time so the effect of each can be assessed.
Keep us posted, buddy.
 

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This is PREX1, right? My car has less than 400 miles on it; why is it so rusty? :ROFLMAO:
Anyways, this is listed as Bosch 281002996 Boost/Manifold Absolute Pressure (MAP) Sensor, and PREX2 is Bosch 281006028 Intake Manifold Pressure Sensor, and looks like the Pierburg controls the wastegate.

I want to better understand what the Chipbox is doing. It can easily raise boost by manipulating the Pierburg, but does it then under-report the values of PREX1 and 2 to the ECU so that the ECU doesn't freak out? How does it trim the fuel for the extra boost? There's no way this unit can adjust the timing is there?



 
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