Boost level

[turbotuner]

Indeed, you can change the boost map profile to give you MBC style super-aggressive boost spool, but it will cost you a lot in tyres and will be difficult to put the power down in the wet.

[854tga+]

I may have located the issue, software load?  I may have messed up the initial software load by connecting the ecu too early?  My TT unit fails to auto detect my ecu & I am getting error messages like (Block #1) USB connection failures.  Question can I just re-install the software?

[turbotuner]

Please contact me by email with your phone number and I can help you fix it. Don't re-install the software because it's unlikely to be the problem.

[854tga+]

Turbo-tuner support is unreal!  Adam called me from England!  Problem was resolved and the vehicle is boosting great.  It turned out that when my mbc was removed the vac. lines were reversed.

[glock19]

Errr....  Your rerouting of the vacuum line to the BCS helped your communication issue ?

[turbotuner]

Errr....  Your rerouting of the vacuum line to the BCS helped your communication issue ?

There was a comms problem with the ECU. This was quickly resolved, but there was still a poor performance issue even when running the example performance tune. However this performance issue was simply caused by the BCS vac lines being the wrong way round, resulting in low boost and no boost response to changes in the boost map.

[prasamin]

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.

So why do you get the same boost level on the same RICA tune on an 18t as you do on a 15g when installed one after another?....the boost level on the tune is set at a specific level as far as I know...i've had the 19t Rica tune on the 19t and the GT35R with same boost levels, although different responses in getting to that boost level....

[turbotuner]

So why do you get the same boost level on the same RICA tune on an 18t as you do on a 15g when installed one after another?....the boost level on the tune is set at a specific level as far as I know...i've had the 19t Rica tune on the 19t and the GT35R with same boost levels, although different responses in getting to that boost level....

I'm not saying that the boost will be different. I'm just saying that the boost may be different. It depends on the specific setup. For example, variations in things like actuator settings can make a big difference.

[ozzimark]

It shouldn't be different. There is nothing measuring manifold or boost pressure on our cars. The ECU isn't targeting a certain pressure, but instead should be going for an airflow target, based on throttle, rpm, temp, load, etc. If there is more airflow than expected, it opens the wastegate some, or vice versa.

AFAIK, the ECU calculates boost pressure in a similar way that a MAP car calculates airflow, just going through the VE equations in the opposite direction. Since VE changes when you do things like add a different turbo, free flowing exhaust, FMIC, whatever, that's why you see guys reporting different levels of boost when they make those changes. The ECU doesn't know that you just changed VE, and so it goes to targeting it's normal airflow.

Although extending that, if VE goes up, airflow goes up at a given boost, so you would suspect pressure would go down when following that scheme, when most report the opposite. Hrm. Time to really figure out what the ECU is up to here.

[turbotuner]

Perhaps I didn't really explain what I meant properly.

At WOT (which is what we are talking about when people mention boost levels being too low), if for example you weaken the actuator you may run less boost on the same map. This is what I'm referring to when I say that there may be differences in boost from one car to another, ie mechanical factors can affect it.

Although the MAF is indeed used to calculate the boost pressure by air-flow measurements, the actual boost pressure you run will depend on various other factors. That is why given the same map, two cars may well run different boost levels.

The main point I was trying to make is that just flashing the ECU with the example performance tune may give different results on different cars, whether it be due to a fault (like it was in the case of the OP), or whether it be due to other factors. If the boost pressure is not responding to changes in the boost map, then you probably need to look at other factors that may be affecting the boost, ie faults, mechanical limitations, environmental conditions, fuel grade etc.

[lookforjoe]

With my setup, I'm using an Apexi-AVC-R to control boost. My hybrid 20g's actuator is designed for a minimum of 15psi. Once I receive & install my ME4.4 ECU, is that going to present initial setup issues?

[turbotuner]

With my setup, I'm using an Apexi-AVC-R to control boost. My hybrid 20g's actuator is designed for a minimum of 15psi. Once I receive & install my ME4.4 ECU, is that going to present initial setup issues?

No, it won't give rise to any issues at all. All you need to do is make sure that you have raised the MAF limits so you don't hit the over-boost fuel cut.

[lookforjoe]

Thanks - does TT come with a manual/pdf with directions on all this stuff?

[turbotuner]

Thanks - does TT come with a manual/pdf with directions on all this stuff?

yes, of course! 

[GreekT-5]

Good morning,just FYI,with the tuned maps,the pressure goes up to 1.1bar.checked it last night.......