mazdaspeed protege

[g-tek]

I own the new speed protege. Seams like turbo is surging. Not smooth under light acceleration? Feels like turbo spools up and stops and then go's again. Whats wrong with my new car!!!

[GBean009]

The problem with your car is you bought into a first year Themed production economy car. The second is that you probably don't know how to drive a turbo charged vehicle.

[mazfordtech]

it is a normal condition for a turbo car. when you are accelerating in a speed protege the car will seem like it is surging foward at around 3000 rpm. this is because a turbo has to spool up before any effects will be felt. example: when you are accelerating(before 3000 rpm) the car feels just like a regular 2.0l protege, but once the car hits 3000 rpm the turbo starts to create boost pressure which in turn gives the car a sudden increase in horsepower. so do you get it?

[cmugen]

turbo lag

[505zoom]

Originally Posted by GBean009

The problem with your car is you bought into a first year Themed production economy car. The second is that you probably don't know how to drive a turbo charged vehicle.

You my friend are an idiot. How about not posting worthless crap huh?

Originally Posted by mazfordtech

it is a normal condition for a turbo car. when you are accelerating in a speed protege the car will seem like it is surging foward at around 3000 rpm...

The BB T-25 in the msp has little to no turbo lag. That is not the problem.

Originally Posted by cmugen

turbo lag

You guys are all wrong. He is not talking about a single surge of power, it feels more like a pulsing that happens several times in just a second or two at a set throttle position.

Originally Posted by g-tek

I own the new speed protege. Seams like turbo is surging. Not smooth under light acceleration? Feels like turbo spools up and stops and then go's again. Whats wrong with my new car!!!

The problem is that the msp has very poor fuel mapping. The surging that you feel is because the car runs way too rich (A/F drops below 10:1 on most of the dyno charts I have seen). Mazda released an updated PCM flash aimed at correcting the problem, but they did it all wrong. Instead of adjusting the fuel mapping, they just advanced the timing... not good for boosted motors. If you are not flashed, and plan on upping your boost, don't do it. It will cause more problems than it will solve. If you plan on leaving the boost at stock levels, then the flash WILL smooth it out a little, and give you a little bit more mid range power. If you DO plan on upping the boost, then do what I did and get yourself a piggyback or standalone to tune the fuel curve. Modern Performance has a piggyback computer (mpi tuner) that costs $675, and you can tune out the hiccups with it. It also acts like a full standalone for timing.