Hi guys one of my buddys has a motorola 2.5 bar sencor and is saling it to me cheap so my power goals are 300-350whp and latter going for 450whp
Its a d16zc forged turbo etc...turbo its a garrett t3/t4 57 trim . Now will il be ok with the motorola 2.5 bar or will it bi better a 3 bar

Its for daly drive to ...

 

It all depends on how much boost you will be running. A good way to look at it is your car will be making X horsepower naturally aspirated for this example lets say 140 horsepower now for every 1 bar or 14.7psi of boost you in theory will double your horsepower. This of course can go up and down depending on your setup. So lets just say double for the ease of it. So at 1 Bar your car would make 280 horsepower. So at 1.5 Bar you would be at 350 horsepower. Probably the limit of the 2.5 Bar sensor. The 3 Bar sensor you would be at 420 horsepower with 2 bar of boost.

2.5 Bar - 1.5 Bar or 22.05 psi of boost
3 Bar - 2 Bar or 29.4 psi of boost
3.5 Bar - 2.5 bar or 36.75 psi of boost

 

Ok so 2.5 bar would de perfect for my goal ?

 

If you are planning on increasing the boost later, I would recommend going with the 3 bar. A 3 bar MAP sensor can handle up to 29.7 psi of boost and the 2.5 bar sensor can handle up to roughly 22 psi, so like RType16 said the amount of boost you are planning to run is what will ultimately determine the correct MAP sensor. (He gave an awesome explanation of boost vs. horsepower.) If you purchase the 3 bar now, it will save you from replacing the sensor when you decide to push the car to your higher horsepower goals.

 

Yes but i herd that i should go with what i need for now to get a better tune ?

 

Let's say we have a 150 horsepower motor. Like Rtype16 showed in his calculations, ideally at 22 psi you would get 375 horsepower (this is the limit for the 2.5 bar sensor; 2.5 x 150). Unfortunately, engines are not 100% efficacious and you are likely to only get 60 to 80% of that power. Therefore, at 22 psi, your car would get 300 horsepower (80%) instead of 375. So, with a 150 horsepower base motor, you would need to push the boost higher than 22 psi to reach your goals, therefore, you would need a 3 bar sensor to handle the increased boost. Just use this scenario and work through it with your base horsepower to see which sensor would be a better fit. I hope that was kinda clear. If not, let me know and I will try to clarify anything you need.

 

Basicly a 2.5 is for about 300whp and for my goals a 3 bar should be better ?

But i heard i should go with the clocet to my goal bar sencor to get better resolt
?
Corect me if im wrong ?

Thanks

 

What is the base horsepower in your car? Let do the calculation with the correct value. If you would go over 22 psi with the 2.5 bar sensor, things are going to start going wrong and your engine will most likely shut itself down. Depending on your base horsepower, we can try to figure out approximately how much boost you would need to reach your goals, then we can better determine which sensor would be best. You should go with a sensor that is pretty close to your goals, but I am afraid that your goal may be right at the limit of the 2.5 bar sensor.

 

Base hp of my motorcis 130 hp

Goal ofwhp is 300-350 whp And if posible 400whp

 

IMO it would depend on the brand of sensor. Motorola 2.5bar or 3bar is a good sensor. The typical GM knockoff 3bars are crap. I would pick a 2.5 bar over a 3 bar if the choice were between Motorola and GM; I have experience with both (currently running a Motorola 4bar).

 

2.5 or 3 bar wich one for my goals that my questioon

 

Ok. So, in a perfectly efficacious engine, your car should make 325 horsepower at 22 pounds of boost. Since engines are not perfectly efficacious, we are looking at about 260 horsepower (80% power; these numbers will vary depending on your setup and the actual number will likely be a little higher due to other performance parts and the fact that none of this takes into account the actual turbo or engine size) at 22 psi. Therefore, you will have to increase the boost past the 22 psi limit of the 2.5 bar sensor in order to reach your goals. The horsepower goal you are going for and the boost required is just outside of the range of the 2.5 bar. Just keep in mind that all these number are estimates and they probably will vary.

My ultimate recommendation is a 3 bar. You might be able to pull off 300 HP on the 2.5 bar, but if you are shooting for a higher number, I would definitely go with the 3 bar. If you need anything else, please let me know!

 

Man that helps me a lot thanks it clear now im going with a 3 bar

 

You're welcome.