Hi. I have a big and old problem. I have Grande Punto 1.3 75 hp model. I have modified all the car. Big turbo, exhaust system vs.vs.vs. . I did everything at the car. And i am a chip tuning seller.

I have problem with my car. The problem is about turbo pressure. The car's ECU is not supported high pressures. My chip tuning expert and me worked on this cars ecu for a long time. At the end we only raise up to 1.7 bar but no more...

What happens?

Normally If you boosted up the pressure. If the boost go up to 1.5 bar, the car went into the safe mode. The failure lamp show up and the car can't move than 3000 rpm and no boost upper than 0.5

This is so bad problem for me.

I want to ask all the site. Is there anyone know the solution? How can we change the cut-off. In the map MARELLI we can not find anything about that. So we can not go away from safe mode.

If there is any friend knows something about this or if anyone fix that problem please share. If you know any map tuner can say something to me please tell him or tell me about him.

I am waiting your help. Thank you so much.

Cant you up grade the Turbo?

id say for a start more pressure doesnt allways meen more power, bigger turbo same pressure equals more airflow.

but it seems the only way around turning the boost up on modern cars is to uprate the MAP sensor to one that can read higher pressure and allow them to not cock the engine up. or trya nd fool it into thinking its boosting as normal.

Thanks for your help. I don't want to enter an electric sensor to the engine. Or i don't want to change the sensor. I must find something in Map, in ECU. Or i need a person who did the same problem before...

oly way to do it tha way would be to rig a false signal to the ECU fo the MAP sensor so that it only reads standard boost.

tbh it would be better togo standalone ECU, would be so much easier tbh mate.

If you can't change this within the ECU map you could maybe use a FCD you can then clamp the map output voltage so that it only ever reaches the equivelent of max safe boost

However you would then need to figure out a way of getting the additional fuel in go with the extra boost you are wanting so that would mean a second map or pressure sensor and fuel control so you would be talking piggy back or custom ECU

Do you think can i use a different map sensor for my car? If yes, do you recommend me a map sensor? If i change the map sensor is everything will be fine? How these sensor works. Will it say to ECU 1 bar when i am boosting 1.5 bar? Or another thing.

Because in this car's ECU, you can not set the pressure upper than 1.7 bar. This is the uppest...

I find a sensor like this. Is this for my car?

http://cgi.ebay.co.uk/New-2-5-Bar-Map-Sensor-Ford-Lancia-Fiat-Alfa-Romeo_W0QQitemZ170287275451QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item170287275451&_trksid=p3286.c0.m14&_trkparms=72%3A1301%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318

The first thing I would do would be to grab the output voltage from the map current map sensor to see at what value it causes the ECU to limp will be around 5V at a guess. as i said in my first reply you could always use a fuel cut defender rather than lookinh for a diferently calibrated map sensor

Yes you are right but there is no problem about the boost don't worry. I will only boost 1.5 bar. Not more. But not see the safe mod. I must do something to the map sensor. But i don't know what should i do to the map sensor.

stand alone ECU mate. will save a world of hurt.

I am a chip tune seller. not stand alone ECU of course. Please don't say this...

OK I'll say it for a third time try using a Fuel cut defender, they sit between your stock map sensor and the ECU, they are adjustable so you can set these to clamp the output voltage of the map sensor to just below the limp level value of the ECU

You can also of course change to a different map sensor but you will then have to adjust the compleate fuelling map otherwise it will massivly under fuel

or that^^

i think (not sure ask a pro) maybe if you have luck change the ecu with one of the 90hp version....
dont know which pressure this runs in safe mode.
btw think about closing your EGR aswell and CLEAN your inletpipes...
and may be good if you mount an indicator for the pressure aswell.
maybe you could also ask a FIAT dealer about this. .. i know from a BMW of a m8 who had troubled that they could do this kinda stuff in the software

Why are you whacking a big turbo on a 75bhp 1.3? Makes no sense...

Don't give me basic answers and basic comments.

woah. chill out.

were only trying to help.

sorry its not up to your standards.

cculha said:

I am a chip tune seller. not stand alone ECU of course. Please don't say this...

Click to expand...

when you are a chip tune seller, i reckon you know some people who knows how to deal with these problems.
that's some good advertising like this!

cculha said:

Don't give me basic answers and basic comments.

Click to expand...

Well the answers have obviously been technical for you so far if you still haven't got any further.

If you do ECU tuning you must surely have a understanding on how an ECU works and how it estabilshes what to do based on the inputs from various sensors. If you don't, which gathering by you posts you don't then i would go away and do some reading before jumping on people who are trying to help you

He is obviously not getting the answers he wants...