Question about 1998 Volkswagen Beetle

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Engine won't hold boost at 6psi or 20 psi I hear a lot of air noise coming from engine compartment and boost gauge fluxuates when pressng on the gas pedal

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More than likely you've got a charge air leak. I would start with the basics. If you can, get the car in the air slightly. Set it on a set of jackstands for safety. If you have a friend, have him depress the accelerator and using your eyes, ears, and hands (AVOIDING AND MOVING PARTS) see of you can locate the source of the leak. If you find no leak, or if the air noise is coming from the airbox, xhexk for any diagnostic trouble codes. the Stick

Posted on Dec 10, 2009


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How can I increase the horsepower

A simple question with a not-so-simple answer. Engines are designed to last a long time "the way they are." Anythign you do to in crease hp will reduce the life of the engine.

That said, the punk way to get more hp is to add a nitrous kit. Nitous is nitorgen and oxygen. Nitrogen is an inert gas but it gets hot and takes away some heat out the exhaust. It is the oxygen in nitous oxide that helps the fuel burn more efficoiently,thus more hp. Your engine may not be able to pbhysically handle the increased torque without breaking. Aluminum pistons melt easily and nitrous in excess will do that to them. (Watch episodes of Street Outlaws" to see nitorus motors destroying themselves.)

Another way to achieve more hp is to install a supercharger and klimnit the boost to 6 psi on a stock motor. Beyond that, a "boosted" engine requires a lower compression ratio in order to handle all the increased amounts of air and fuel without destroying itself. Air-boosted engines require proportionally increased amounts of fuel to maintain "stoichiometric" air/fuel ratios. That means larger fuel injectors, a larger fuel pump, fuel pressure regulator, cooler spark plugs, and a computer to figure out what to do with it all.

Turbocharged engines have exhaust valve timing retarded by about 20 degrees to prevent "reversion." A larger exhaust sytem is required to exhaust the increases amount of "products of combustion" created by all that fuel and air. Then, too, adiabatic heating of the (now) compressed air requires cooling before entering the engine. Air molecules are farther apart when hot (less dense) so cooling the air delivers more O2 per unit volume, necessitating an intercooler for that purpose.

Hopped up turbo cars often run on E85. Alcohol has less energy so it won't take you as gas, but it burns MUCH cooler so you can crank up the boost! Guys are running 35-40 psi on the streets with E85 and making 700+ hp in some cases. But then, they have 10-25k invested and the engine is only some of that. Drive trains have to be strengthened.

Peformance engines are designed to handle the torque they make. Stock rods, cranks and pistons *may* hold together but beefed up aftermarket items are the way to go for increased reliability. A "stand alone" engine computer is required if you have any inclination of ruling the streets in your town or even being a contender.

There is, obvioulsy, a lot to know before you "add horsepower."
Visit a speed shop that has a dynomometer. They can advise you best. (They aren't serious if they don't have a dyno.) And don't listen to braggers online. They are not much help. The best way is to understand the physics of 4-cycle engines. After that, have at it and be prepared to spend a lot of money for parts and tickets! For me, the fun was in the learning!

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1 Answer

Oil pressure gauge does not reach 40 PSI. Heard the sounds like a loud ticking coming from the engine on the passengers side. Then pressed on the gas peddle and it didn't want to add power. Ticking n

Not sure if there is a question here or not. If the pressure is always below 40 and you are hearing engine noise, chances are the oil pressure really is low. You could replace the sending unit or use a mechanical gauge to verify.

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Oil pressure gage for 2006 chevrolet express reads 20 at start up is that normal

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1 Answer

Oil Gauge Dropping to 5 psi

Hi again Kelea, I'm glad to help!

Kelea, if you do not hear a lot of engine rattling noises then I would say your "Oil Pump" is OK and you need to replace the "OIL SENDING UNIT" which you can buy at Autozone. CAUTION: If you do hear a lot of rattling noises coming from your engine then I'd suggest having someone check the oil pressure. If the oil pressure is low then it could be all kinds of things that can cause low pressures. From engine bearings, to restrictions, to the oil pump itself. I would start with the oil sending unit first and see what your oil pressure looks like. If your oil pressure is good after replacing the sending unit then I'd consider never taking my vehicle back to the shop that told you it was the pump. Hope this helps and have awesome day.

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when you turn the key to the start positoin do you hear the fuel. and do you know if you got any spark? link to my garage

Dec 01, 2012 | 1988 Buick Regal

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Can I turn up the psi on my Mazda's turbo?

Yes but you need a kit to do that from some aftermarket source. The factory turbo pressure "dump" valve is not really adjustable. If you do this and add to much boost you can (and likely will) damage the engine or at the very least blow a cylinder head gasket. Do not go over about 2-3 pounds more boost, that will be good for about 20 HP. You will also need to modify the exhaust to be free flowing and the air intake system to flow more air as well as calibrate the computer for the extra boost and use premium gas all the time. You see it is not that simple.

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1 Answer

Hi my twin turbo ej20 is having boost issues,for some reason it only boosts 6psi,occasionally it might hit 10 psi and sometimes theres no boost at all


I would definitely check for vacuum leaks in all your boost control valve vacuum reference lines. I would also check the operation of your boost control valve which is located just ahead of the strut tower on the drivers side of a right hand drive car and the passengers side of a left hand drive car. And always remembering the basics... don't forget to check the condition of the air filter... sorry I had to say it. Also make sure your plugs, wires, and fuel filter are not overdue to be changed, just because these items are in direct relation to engine power. If your misfiring due to an ignition and/or fuel issue you will lose rpm, which consequently means you will lose boost. I hope this info helps!!

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2006 chevy 2500 express cargo van .What is a good oil pressure for this van. it has 150,000 miles runs great

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I really hate hot linking to other URLs, but I think this guide will help you out a lot.

Boost Controller Installation

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