TST/EZ Stack Direction

[banshee]

Who has stacked a pressure box with the TST box? I tried mine this weekend and found the Edge had to go into the map sensor into the motor, TST into the Edge, and the pigtail into the TST. When stacked TST first the truck had a horrible stumble and set code P0204 (#4 Injector Circuit). The TST alone ran great, too. My thinking tells me that the TST should be first to get the true boost, but it just doesn't work. What have you guys found?

Thanks,

John

 

[mattymac]

The TST has to go first into the map sensor on the motor, then the Edge EZ into the TST and original map sensor plug. Do a search, this has been disscused in better detail.

 

[DLeno]

something's not right. in order to fuel correctly, and for the EGT-based de-fueling circuit to work, and for the TST boost gauge to work, the TST has to go onto the engine block. make sure the TST by itself works good, then stack the EZ onto it. I can't imagine any advantage to the reverse stack.

 

[banshee]

I've done all the searching I can, and I've found that people are going both ways... pressure first and TST first. I tried the TST only and it worked great... no codes and plenty of power. When I tried stacking the Edge with the TST first it threw the code and was misfiring and wouldn't take fuel. I found by swapping the map sensors around that it solved the problem, but I have the EZ first to make it work. I was just curious if you guys had any ideas why. I'm not interested in defueling or the digital boost gauge... just the most power. Can the edge be run without it's map connector altogether?

 

[banshee]

I should also add that the power is waaay up. The clutch slips on anything over 2/1... either 3/1 or 2/2 will spin it. I get a little smoke on 2/2, and a pretty good cloud on 4/4. Boost on 2/1 is up a little from 26 to a max of 28.

 

[KS_Cummins]

I have them stacked and run the TST first and the Edge second. The Edge is on level 4. I have no problems and have not thrown any codes.

 

[ChrisKringle]

I ran my Dr. P 100 hp pressure box first for a long time. Just swapped it around the other day. Now the TST plugs into the map sensor first. Runs the same, didn't notice much of a difference in performance.

 

[DLeno]

Originally posted by banshee

I've done all the searching I can, and I've found that people are going both ways... pressure first and TST first. I tried the TST only and it worked great... no codes and plenty of power. When I tried stacking the Edge with the TST first it threw the code and was misfiring and wouldn't take fuel. I found by swapping the map sensors around that it solved the problem, but I have the EZ first to make it work. I was just curious if you guys had any ideas why. I'm not interested in defueling or the digital boost gauge... just the most power. Can the edge be run without it's map connector altogether?

The Edge box might not be boost fooling correctly. If I allow myself to jump to conclusions without more information I'd say that the Edge is sending a bad boost signal -- perhaps not limited like it should be. When you plug in the EZ first, do you get high boost readings on the TST boost gauge?



try running just the Edge and no TST. does it throw an overboost code? what code were you throwing?



no, the Edge cannot be run w/o its map connector it fuels based on Manifold Absolute Pressure.

 

[banshee]

Doug,



Both boxes by themselves work great. I've had the Edge on the truck for about 2 months before I finally got my TST box last week. I haven't dynoed, but it is putting a noticeable gain out by itself. The same is with the TST... a great gain with no codes or drivability issues Max boost was right at 26psi w/ the stock elbow, and egts of 1250 max. Having read the posts here and on other forums, I decided to go ahead and stack the boxes together. I still have the Edge on the level 4 setting I've had it on since I got it. When I got the TST I unhooked the edge and ran TST only first to make sure the box was trouble free. When I stacked the Edge back on I left the TST first in the block and put the edge between it and the factory pigtail. I also hooked up the fuel pressure port and fired up the truck expecting no problems from everyone's reports. It instantly threw code P0204 (#4 injector circuit) and had a bad stumble/misfire. Bringing the RPMs up as high as 2000 rpm did not clear the stumble/roughness. The three of us installing the box scratched our heads, unhooked the edge, and the truck was smooth again. I rehooked it again, and the same stumble came back. It was then suggested that I swap the MAP sensor plugs just to try it. I figured why not (although, I agree... it makes sense for the TST to be first), and it runs flawless. The power is up with the Edge stacked as I can now slip my clutch on 2/2 and the truck is beginning to feel like my '01. I can't say what kind of signal the edge is putting out since I only have the R37 remote... no digital gauges. The boost on 2/1 is up 2 pounds from 26 to 28, and on 2/2 it is a tick higher, but the clutch slips, so it's hard to tell. It seems strange to me that some will work, but mine runs like crap.



Thanks for the help,

John

 

[BCarmicle]

When I let the EZ go in the engine's map sensor and then TST behind it, my max boost was 20. Then I let TST go first and get 40lbs on the digital gauge and then the wastegate dumps it. When EZ is in first it does the boost fooling and doesn't let it get over 20lbs.

 

[DLeno]

good additional info. another armchair thought on this. The only electroinics capable of affecting one injector circuit over another is the TST. It occured to me that something might be goofball in the TST that manifests itself only when the TST is fueling heavily. I say that because what reproduces the problem is to let the TST see full boost pressures. When you give the TST fooled boost (from the EZ) there is no problem, but when the TST sees pure unadulterated MAP, it freeks out. I think you should talk to Mark about this. maybe there is an oddball hardware problem with the TST.

 

[banshee]

That still doesn't explain the rough idle (0 boost), or that the TST does fine alone. Once I get a good clutch in a couple weeks I can open it up to see how it does on higher levels. Maybe I'll have to look at a custom programmed Ramifier that does no boost fooling so I can leave it first, but not lie to it when I get on it.



John

 

[DLeno]

yea you're right it doesn't explain the TST-only behavior. you need an OBD II scanner so you can witness boost fooling. the only thing different that coudl explain the odd TST behavior is that the TST gets a different boost signal with the EZ in front of it. maybe you just have hardware marriage problems -- the EZ is introducing something onto the MAP signal wire read by the TST that the TST does not like. who's fault that is is unknown, but I think I'd still be talking to Mark. there's so many other examples of this combo working with the TST in front. .

 

[mattymac]

could it be just an aftermarket plug problem? I know that the boxes worked fine by themselves and its an injector circuit code but is there ANY way that it could be just an aftermarket plug to plug connection from the map sensor connection? I had that problem with an EZ box I ran and it did the same thing with the stumbling and running horrible just no codes. Also doesnt the EZ get power from the MAP sensor (or is it FP sensor)? So if for some reason the two aftermarket plugs are having conflicting connections that is introducing a problem to the TST or EZ software I just wonder what circuit it would affect (one would think boost curciut)? Maybe looping through one of the TST fueling circuits with bad vibes setting the inj. codes? Ive seen alot wierder things in my days. Aaahhh worth a thought anyways.

 

[DLeno]

something is definately wrong with either or both boxes. the connector thing is a good thought. yes, 5v power comes from the MAP sensor I believe.

 

[banshee]

Thanks for the input guys!



I pulled off the EZ last night and did some more test runs. With the stack on 3/2 I maxed at 26 lbs in 4th gear. Without the EZ it went as high as 32 during a shift, so the EZ first is definitely capping max boost. Power, however is down without the stack in line. I examined the EZ closely, and it looks like one of the pins in the plug might not have been seating fully. I'm going to try to restack in the correct direction, and if that doesn't work I should be able to clip the modified signal wire going out of the EZ and jumper across to the input signal wire. Doing that will still give the box it's necessary input, but also feed the TST the raw voltage. If the plug doesn't work then I guess I have a gremlin somewhere... . they make electronics so frustratinig... LOL.



Edit: Yes, power comes from the MAP sensor.

 

[mattymac]

How about this? If we were to take the TST and hook it up normally to the stock harness, then get a second stock map sensor put it on the intake somewhere for a true unfooled reading then jumped the power wire from the original map sensor to the output boost plug to an EZ or whatever for an unfooled full boost reading to the EZ. I know we would end up with the open female plug on the EZ but if we get it power to the plug via a jumper wire and the TST is looped through the stock harness could this work for a bigger power boost? dont see why not.