What should be changed with rev limiter raise?

[dbtk2]

I am raising the rev limit in my STE chip to 6600rpm, right now I'm just doing a test file on the computer not actually burning anything to a chip yet, I'm just trying to get used to the program, but I'd like to get some help from you guys.  While you guys will probably argue and say its stupid and whatnot, I have my reasons so this is what I'm doing.  However, I know to change the limiter I just change Max RPM fuel cut to 6600 and then fuel return rpm I set at 6425.  But are there any other settings (mainly like tables or something, I looked through the constants pretty thoroughly but don't know enough about the tables and how exactly they control things to be able to tell if something needs to be changed) that need to be altered to allow me to spin the engine that fast?  For instance I see one constant called "F1 Table Extension HI RPM Breakpoint", it is set at 6375rpm.  Any ideas what this constant is (what does it do?) and should I raise this value up above my desired 6600rpm limiter?  I raised my park limiter to 4000rpm since I don't see the need to go over 4k, but I do think 3k is way too low.  I also raised my boost cut to 14.5psi, I watch stuff close enough that I don't feel I need it, and no matter what you set it at, you always want to run just a little more boost than it will allow so I fixed that problem.  Also it has the injector flow rate constant in there, if I change the value for the injectors to compensate for larger injectors, is that all that needs to be changed, or would there be an air/fuel table or something that would need to be changed as well.  Just trying to figure this basic stuff out before I try to dig into something a little more complicated.  

Thanks,

Shawn

[TGPilot]

I also raised my boost cut to 14.5psi, I watch stuff close enough that I don't feel I need it, and no matter what you set it at, you always want to run just a little more boost than it will allow so I fixed that problem.

Just raising the OVERBOOST FUEL CUTOFF PRESSURE will not raise your boost levels with the wastegate actuator solenoid. You will need to change your boost table in DESIRED BOOST PRESSURE BASE. If you double click on DBPB in the tables section in TunerPro it will open another window. Then click on VIEW GRAPH. If you hold the control button on your keyboard and then left click on the graph you will be able to move the 3d table around to see your different setpoints. Now if you put the arrow for your mouse in an intersection of the colored graph and click your left mouse button it will put a point on the graph. You can then move the point to raise or lower your desired boost pressure. If you hold the control button you can select numerous points and then raise and lower an entire section to your desired setpoint.

On the graph you will see 3 axis. One is RPM (2400-6400RPM), then the PRESSURE itself in Kpa (0-199.22Kpa), and throttle position (38%, 50%, 63%, 75%, 88%, and 100%) Yours probably has 37, 550, 62, .57, 5 8, and 7.5...that is just a misinterpretation...but it can be changed. You can change the numbers to be correct. You edit the labels by single clicking the DBPB in the table list, then hit F2. A window will pop-up. Select the Colums tab, click on the #value you want to change in the chart, enter the numeric value shown above, and enter the labels. Make sure after you put in the values above they are exactly as stated above. Then click apply and open the graph again.

Also, here is a webpage conversion I use for figuring out what Kpa to PSI is... http://www.ilpi.com/msds/ref/pressureunits.html

Also it has the injector flow rate constant in there, if I change the value for the injectors to compensate for larger injectors, is that all that needs to be changed, or would there be an air/fuel table or something that would need to be changed as well.  Just trying to figure this basic stuff out before I try to dig into something a little more complicated.  

Thanks,

Shawn

As far as injector flow rate...I have the same question. I wonder and will play with it more another time...but if you put in a higher or lower value will it change other setpoints in the tables and constants automatically or is that nothing more than a BPW selection to get started with larger injectors? Good question and I will be looking into it.

Setting your RPM limits...I have not messed with it because until I have a MUCH stronger valvetrain it will not be necessary for me.

Hope this helps...Kenny 8)

[dbtk2]

Just raising the OVERBOOST FUEL CUTOFF PRESSURE will not raise your boost levels with the wastegate actuator solenoid. You will need to change your boost table in DESIRED BOOST PRESSURE BASE. If you double click on DBPB in the tables section in TunerPro it will open another window. Then click on VIEW GRAPH. If you hold the control button on your keyboard and then left click on the graph you will be able to move the 3d table around to see your different setpoints. Now if you put the arrow for your mouse in an intersection of the colored graph and click your left mouse button it will put a point on the graph. You can then move the point to raise or lower your desired boost pressure. If you hold the control button you can select numerous points and then raise and lower an entire section to your desired setpoint.

On the graph you will see 3 axis. One is RPM (2400-6400RPM), then the PRESSURE itself in Kpa (0-199.22Kpa), and throttle position (38%, 50%, 63%, 75%, 88%, and 100%) Yours probably has 37, 550, 62, .57, 5 8, and 7.5...that is just a misinterpretation...but it can be changed. You can change the numbers to be correct. You edit the labels by selecting the table in the list, then hit F2. In the Colums tab, click on the #value you want to change, enter the numeric value shown above, and enter the labels. Make sure after you put in the values above they are exactly as stated above. Then click apply and open the graph again.

Also, here is a webpage conversion I use for figuring out what Kpa to PSI is... http://www.ilpi.com/msds/ref/pressureunits.html

Also it has the injector flow rate constant in there, if I change the value for the injectors to compensate for larger injectors, is that all that needs to be changed, or would there be an air/fuel table or something that would need to be changed as well.  Just trying to figure this basic stuff out before I try to dig into something a little more complicated.  

Thanks,

Shawn

As far as injector flow rate...I have the same question. I wonder and will play with it more another time...but if you put in a higher or lower value will it change other setpoints in the tables and constants automatically or is that nothing more than a BPW selection to get started with larger injectors? Good question and I will be looking into it.

Setting your RPM limits...I have not messed with it because until I have a MUCH stronger valvetrain it will not be necessary for me.

Hope this helps...Kenny 8)

I didn't want to change the boost levels that the actuator gives, I can adjust that manually.  I just wanted to change the boost cut so the thing wouldn't shut off all the time.

As far as the RPM limits go, I'm not too worried about it since I have the crane 260 cam, P&P'ed 3100 heads, and LS1 springs/retainers, and very shortly it'll have roller rockers as well.  6600 should be no problem at all, although I don't know what kind of power it will make up there before the new turbo goes on.  

Thanks for the help so far, I'd still like to know about the limiter though for anyone that knows anything about it.  I've learned tons already though, can't wait until I get a little more knowledge on it so I can really get my car to run how I'd like.  Maybe Jeff M could shed some light on this???

Shawn

[TurboGTU]

BPW needs to be changed for bigger injectors because Injector constant and Injector flow rate won't change the fueling by themselfvs. Injector constant and flow rate are used for BL fuel trim and air flow cal. The Block learn  seems to pull fuel based on the assumed injector size and rate. BPW vs EGR is a major fuel table. Its kinda like another fuel injector constant. It changes the "injector" size based on EGR.
So all thise work like the VE talbes. You know. Idle fuel, main VE, and VE vs rpm and map. It adds them up and finds the average sort of speak.

ECM factors all 3 fuel injector tables. If you don't move one and changed another a whole lot...the ecm will spit wrong info to it self.

Not just the BPW and Constants are all you need to move. The VE tables need to be moved too. THE fuel curve will be "off" if just BPW and injector constans are moved. VE need to be moved to "fine tune" the engine. The air fuel ratio tables shoun't be moved if you got those other tables right. If you do move A/F Ratio tables...the ecm will try to shoot for the desired A/F ratio. It will patch a bad curve for a while. But block learn will put an end to it and will over rich or lean what ever you put there. SO if you had 14:1 a/f ratio at 4K rpm on the code and the enigne did 15:1 on the dyno and you decide to change it to 13:1 and the dyno gives you 14:1...you'll be set just for that time. As the ECM learns from BL and Short term...it will give you 13:1 on the dyno the next time at that point...thereby lowering your power or what not.

Then move the Decell talbes... :roll:

The ECM is stupid. You have to tell it EVERYTHING. It can learn from small changes..but not big gaps.