hesitation question

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02-18-2003, 07:07 PM

jimr

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Join Date: Feb 2003

Location: busy writing log of best roads in CA.

Posts: 568

Car Info: 2002 WRX Sedan

hesitation question

I have just a few questions regarding the stock WRX engine/driveability issues.

I notice a slight hesitation under acceleration (wide throttle opening, but not fully open) after 3Krpm. I have read of modified WRX's having this problem under acceleration due to 'boost spikes'.

If the throttle is opened completely, the engine sings through to 7K pretty easily. It is only under wide (but not 'floored') openings that I experience the slight 'bumps' in the powerband.

Is this a normal quirk of the factory engine management? And if so, can it be 'tuned ' with aftermarket ECUs etc.?

Has anyone performed back to back tests at the strip to determine if removing the air intake silencer adds any engine response? I removed mine a few months back and then re-installed it due to noise.

What is the answer with the cold morning clutch shudder?

I am new to Subarus, I have spent 15 years in the air-cooled VW drag racing circuit, but have found a new love (the WRX).

Thanks for your time,

02-18-2003, 08:00 PM

WRX4FUN

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Been there

I noticed a slight hesitation under acceleration (wide throttle opening, but not fully open) when my car was stock and I beleive this is common. I stepped up to the Unichip but still had the problem only worse. I sold the Unichip and now have a Turboxs Utech and the problem is 100 % gone. I am only running stage one and I also have a K&N Filter and a ProDrive WR Sport rear exhaust and the car runs so smooth its scary. Even only at stage one the car pulls much harder in every gear. I can't wait to move to stage two.

02-18-2003, 08:37 PM

jimr

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Thread Starter

Join Date: Feb 2003

Location: busy writing log of best roads in CA.

Posts: 568

Car Info: 2002 WRX Sedan

thanks for your input

Can you give me some details about the electronics you went with? And the Prodrive exhaust?

thanks again,

02-18-2003, 08:54 PM

WRX4FUN

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Hope this helps

The Electronics are really simple. Order a Utech and install it and run Stage 1 until you can get it dyno tuned. This is as plug and play as it gets.

The Exhaust is a ProDrive WR Sport. Here are a few sites. It lets the Boxer engine sing its sweet music.

http://totays.com/mt/pages/mods/prodrive%20muffler.htm

http://www.spimotorsports.com/Catalo...ler_621604.htm