Boost level

[854tga+]

What boost level is everybody getting when they install the supplied modified TT tune?

 

[turbotuner]

That will vary from car to car. What are you getting?

Remember that the supplied performance tune is only a base tune to get you started and help you understand what to change and how to change it. It's not a fully optimised tune for any specific setup, although it should give good results on a 15G/16T setup.

Turbo-Tuner is all about optimising the specific setup for your car, rather than settling for an off-the-shelf solution which is often a compromise. So if you're not happy with the boost level, you can change it!

[854tga+]

I understand everything you have said, I just thought I would be seeing more than 9-10 psi.  I was hoping for a base modified map of 14-15 psi.  On another thought I may just installed the wrong map?  As far as getting good results with the present map, feels slow & very stock.

[turbotuner]

I understand everything you have said, I just thought I would be seeing more than 9-10 psi.  I was hoping for a base modified map of 14-15 psi.  On another thought I may just installed the wrong map?  As far as getting good results with the present map, feels slow & very stock.

You may have loaded the wrong map. In the Turbo-Tuner app, the currently active tune is displayed at the bottom of the screen. In the project manager, it's the one highlighted in green.

If the current selected map is the performance tune, then just connect to the car and click Flash to ensure you program that tune.

If the current selected map is the stock version, then connect to the car, select the performance tune by clicking on it, then click Open. This will program the performance tune.

If you are definately running the performance tune and not getting higher boost, then you may well have a mechanical probelem. If everything is running ok, the supplied performance tune should give approx 1.0 bar (14.5 psi) of boost on a 15G/16T with a correctly set actuator.

[300+_T5R_855]

I don't think so.  I wasn't seeing that much with the modified tune.  I was getting about 5-7 psi. 

[turbotuner]

I don't think so.  I wasn't seeing that much with the modified tune.  I was getting about 5-7 psi.

Yes but you have an 18T with a totally different setup. The boost can vary significantly from car to car. All I am saying is that if you take a bog standard 850 T5 with a 15G or 16T with everything mechanical working correctly, and then program the Turbo-Tuner ECU with the performance tune, then you should see approx 1.0 bar of boost.

[300+_T5R_855]

OK, I see, but don't quite understand.  MAF is MAF  It doesn't know what turbo I'm running.

[turbotuner]

It's nothing to do with the MAF. It's to do with the duty cycle on the actuator and the turbo characteristics such as the wastegate setting. Also depends on other mechanical aspects too.

Simple explanation - Fit an MBC and you can run more boost, irrespective of the MAF.

[300+_T5R_855]

But the ECU uses MAF to control boost pressure, regardless of where the waste gate is set.  Unless you trick the ECU by using an MBC the ECU does not know what turbo you have or the externally controlled boost settings.  The ECU only knows the amount of air that the MAF reads.

[turbotuner]

But the ECU uses MAF to control boost pressure, regardless of where the waste gate is set.  Unless you trick the ECU by using an MBC the ECU does not know what turbo you have or the externally controlled boost settings.  The ECU only knows the amount of air that the MAF reads.

The ECU uses the MAF to work out the fueling and the calculated load and boost pressure. However, the wastegate settings will affect the boost.

[300+_T5R_855]

When you adjust the boost map what is it controlling?

[turbotuner]

Effectively the duty cycle on the boost control valve. The MAF (as you stated above) only measures air flow. It does not measure pressure, although the pressure is calculated from the air-flow.

[300+_T5R_855]

OK, I see.  I thought it used MAF to adjust boost levels.  I don't remember where I read that.

[854tga+]

I will verify what map I selected this weekend. I just removed our mbc to allow the TT program to control boost and see what boost the performance map had.  I to was seeing what CJ reported.  I have another map to try and will report back.  Great feed back!  p/s with the mbc installed I could crank the boost way up ;').

[glock19]

I will verify what map I selected this weekend. I just removed our mbc to allow the TT program to control boost and see what boost the performance map had.  I to was seeing what CJ reported.  I have another map to try and will report back.  Great feed back!  p/s with the mbc installed I could crank the boost way up ;').

With the TT, I don't think you'll be needing the MBC .....