[QUOTE=MRC Motorsports]correct...Closed loop 0-500 values. What turbo system you have and what actuators you using?
QUOTE]


I beleive Kevin has the APS TT.

 

Again, I'm not having any problems. My response was to Quadcam, who in post 91 of this thread made a comment about the UTEC controlling boost.

But, yes, I have an APS TT on an 8.6:1 motor running with the Forge actuators. Ever since the upgrade to 2.8 my boost controller has worked great. I am running in open loop mode.

One question I do have, though, is why would someone select open loop over closed loop? Is there a 'better' choice? It seems like it is just offering two different ways to acomplish the same thing.

Of course closed loop would give more accurate boost control year round in changing climates, like Ohio. Are there any drawbacks to closed loop? It seems like you lose a tad bit of control with closed loop vs open loop.

 

Injector scaling was deleted from the 2.8 version software. There really is no need for it. The injector scaling can be done in the 0% load column instead.

 

People talk with one Vendor/Tuner, and they act like cronies?

I respect all of them here, because all of them have good info and I've learned form everyone's posts on this forum.

 

+1

 

I can't speak for everyone, but I myself have bought a considerable amount of parts of MRC. I haven't bought anything from any of the other sponsors.

Oh, no, wait, I did purchase some stuff from Forged Internals - 3 sets of spark plugs.

I've talked to both Julian and Sharif on the phone on several occasions.

I personally think, not that it is any of my business, that both Julian and Sharif bring all the bad comments on to themselves through their posting styles.

 

I haven't bought ANYTHING from either Sharif or MRC. In fact . . . many of my purchases was private dealings between myself and other members of this forum.

I respect both Sharif and Julian, I've heard alot by talking to both of them and reading what they have to say. I would trust my car at either one's shop because they both know what they're doing and seems to take good care of their customers.

 

got my setup working today! Initially, Ihooked up the wastegate lines on the wrong side of the BCS. I had some issues to say the least!!!

anyway, after a quick call to Jermain @TXS, he said I have to have the lines a certain way. so, I switched 'em.

I set up both wastegates to fit -4AN braided line, intead of the normal rubber vaccum line. I modded the TXS BCS to accept the -4 lines too as the BCS has some odd pipe thread. It is not 1/8NPT. I forget what it is, but I had to do some searching for the right fittings.

Then, I drilled and tapped the upper manifold to add a dedicated vaccum source to feed my vaccum manifold.

It is really cool looking. I used NOS nitrous lines for my setup.....those inductrial crimps are designs to take 1000+ psi! they'll handle my 9 psi without a hitch!

so, I set my car up to run in "closed loop" boost control. I was shocked to find out that a value of "50" had me hitting 9.5 psi. "50" is the recommended starting value in the UTEC manual. I also read through the D-TEC manual to learn more about how it controls the BCS....I am assuming that the UTEC boost control is programmed in a similar manner as the D-TEC. The D-tec manual states that as long as the boost is within 0.3 psi of your target, it won't make any changes. It turns out the UTEC is the same way. I never dropped below 0.3 psi of whatever my peak value was on any of my logs.

I need to mess around with it some more, but I am very happy with it. It was fun to look at my boost gauge; you could see the needle quivering ever so slightly as the UTEC regulated the wastegates to keep the boost where I wanted it.

here's a few pics:

 

Thats hot..
I think the 50 is the reccomended GAIN value, this will control how fast the turbos spool up.

 

That happens to be the preset gain value too.

Jermaine had said to me to try out a value fo 200....that it should be close to 8 psi. I quickly found out that my overboost fuel cut-off works on the UTEC.

 

Oh, and thanks for helping TXS get this sorted out! I, for one, wasn't planning on trying out the BCS until you posted up your results of it working you! I know you take alot of grief on these boards from various sorts, but you also help alot of people out. Keep up the good work!

 

I initially had the same problem. Got it all hooked up and wouldn't work. I've never actually worked with a directional solenoid that didn't have an arrow printed/stamped on it. I reversed the lines and it started working immediately.

If I can get some nice weather today I might switch to closed loop and see how that works out. Where did you end up setting your gain?

 

I left my gain at "50"; I haven't played with it yet. I have the "wastegate closed" value at 3 psi right now. I was an arbitrary value I chose to start with. The manual recommends setting it at 6 psi below your target psi.

I'm not sure how the value in the boost maps is determined. just for your help, my car hold steady at 4.9-5.0 psi on wastegate springs alone. a value of "40" brought it up to 7 psi. "45" came out to about 8psi. "50" put me at 9.5 psi.

when I was testing out my "45" map, I was doing a pull on the road, and the boost was solid as I watched the gauge. all of a sudden, when I hit about 4700, the boost rocketed up and the overboost kicked in and killed power. I was frusatrated that maybe the BCS /UTEC was F'ing up. I pulled over and went in to check my map.....somehow I accidently left a value of "100" on the 4750 line (from 50% -100% TPS)......HOLY crap! so, that's why the boost spiked...at least I know that the BCS/UTEC is doing what I tell it to do.

Good luck, and report back your findings.

 

The value is completely arbitrary. I would guess that it corresponds to the setpoint value in a PID loop. Since everyones mapping range is different (mine is 2-18psi, I believe) it would be difficult to scale that in to a 'real' value and have it work on everyones car.

 

Very nice Andrew! I am glad your chromed Plenum acepted the drill and tap You tapped EXACTLY where I did.. Sorry i couldnt get pics to you like I said I was, I am have been busy here at home and and work bro, I apologize..

Did you find out if tapping the plenum gave you a more accurate reading?? I know when I did that, I hit 10 psi real quick and the UTEC cut my fule immedetely!


Again, very nice looking!

K

 

Thanks for the idea on tapping the plenum.......I wasn't sure where you were talking, but that was the "flat" spot on the plenum. I was a little worried about drilling the chrome!! but it was fine...I used alot of lube.

I don't know if it is more accurate or not, but I don't have to worry about blowing off a rubber hose anymore. The AN fittings are awesome!!! I am going to step that hose and fitting up to a -6 next week....summitracing is my friend!

 

Another trick for getting vacuum lines is a throttle body spacer. The one I use has three seperate vacuum ports that you can use. One to my boost gauge, one to my UTEC, and I have one more to use for whatever (BCS?)

Dave

 

did you buy the AAM spacer? I thought about that one, but I prefer to have the vacuum source from the plenum. there probably isn't a difference, though.

 

Yeah, it was the AAM. It fits in after the throttle body, so it is the plenum vacuum/boost. If it was before the throttle body, it would be different, but after it is good.

Dave

 

right, i knew that. It is a cool little piece.