How many pounds of boost does the 1.8t push from the factory?
you are not helping this post sir.. not one bit
02-13-2006, 08:32 PM
#12
Junior Member
Join Date: Feb 2005
Posts: 1,182
Likes: 0
Received 0 Likes
on
0 Posts
well the N75 is wht actually controls the boost level based on what the ECU tells it to do...
ie. ECU says it needs 14.7PSI so the N75 allows 14.7PSI to be passed through based on that request. It's what allows variable boost levels based on what the ECU wants. Correct me if Im wrong, though Im guessing we are on the same page just talking different parts 
02-13-2006, 08:38 PM
#13
New Member
Thread Starter
Join Date: Nov 2005
Posts: 35
Likes: 0
Received 0 Likes
on
0 Posts
Re: stock p.s.i is around 100... you can push boost through a non turbo car
interesting...i think we have a different measurement scale...the 8 pounds that I made my car boost from the boost contoller install gave me a lot more power...i was running 0 boost before the boost controller....when you say 100 ..I'm thinking you mean 10...because if I push my car to 14 p.s.i and run it constant for at least a week..i'm going to be getting problems out of the motor...I'm comfortable now with the power increase...but I just don't want to push it too far to where i damage my engine...any other suggestions?? thanks though
02-13-2006, 08:44 PM
#16
Ok.. ignore the responses for a while.. I'll try and help a n00b
stock is 0.6 bar which is 8.7 PSI. Chips that most people run here increase that to 1.0 bar or more... basically 15 PSI.
Putting a boost controller or MBC on the car is not going to work well, and can have different effects depending on the year of your car.
Basically.. there's something else wrong with the car that was causing it to make no boost. I would figure that out and get everything squared away BEFORE adding any aftermarket boost controllers. (or any other aftermarket part for that matter)
The ECU controls a valve called the N75 valve, which controls the amount of boost that goes to the wastegate actuator.
If you have a 2000 or newer, your car has a MAP sensor which is a sensor that measures the amount if pressure between the turbo and the intake manifold.
Putting a boost controller or MBC on the car is not going to work well, and can have different effects depending on the year of your car.
Basically.. there's something else wrong with the car that was causing it to make no boost. I would figure that out and get everything squared away BEFORE adding any aftermarket boost controllers. (or any other aftermarket part for that matter)
The ECU controls a valve called the N75 valve, which controls the amount of boost that goes to the wastegate actuator.
If you have a 2000 or newer, your car has a MAP sensor which is a sensor that measures the amount if pressure between the turbo and the intake manifold.
02-13-2006, 08:46 PM
#17
only one scale to measure p.s.i.
i don't think your turbo is running efficently... you definatley should be hitting closer to 85... I've heard of 120 as well... so hmmm maybe by your scale 8.5-12 to p.s.i stock. but no.. you should have a zero on the end of that.. you need to increase your efficency of that turbo.
02-13-2006, 08:57 PM
#18
Member
Join Date: Mar 2005
Posts: 3,415
Likes: 0
Received 0 Likes
on
0 Posts
No, not really...
The N75 is the VW/Audi part identification number for the wastegate by-pass regulator valve. This valve is responsible for controlling the movement of the pneumatic actuator which drives the wastegate. The wastegate is a valve which controls the amount of exhaust gas that flows over the turbo impeller generating boost. Under normal operating conditions the engine's ECU sends signals to the N75 valve asking it to open or close which adds or reduces pressure on the wastegate actuator which results in more or less boost. Due to the fact that the N75 is controlled by the ECU in terms of boost perameters...the Eprom on the ECU is the electronic sender of boost perameters. However, the N75 is the part that mechanically carries out those perameters, although it does "electronically" receive the perameters. So, to be correct the "electronic controller" is the ECU and that is what makes TwentyValveB5's statement correct. Although, it would be best to say that the ECU is the electronic sender of boost perameters and the N75 is the mechanical controller of such perameters.
J
J
