losing boost??
Discussion
i currently have a impreza wrx however just recently it seemed a tad slower and yesterday wen i took it out and booted it at 6000 revs the car stuttered for a second (like the acceleration just stopped all together) and then it kicks back in again??is this because it is losing boost??
On a standard mapped Scooby WRX the boost tails right off at 6800rpm. Between there and 5600rpm boost is back up to about 11-12PSI. Keep your revs between 4800rpm - 5200rpm for max take off and max boost at about 13psi-14psi at that rev range. Any higher and you're off boost.
I know because i do my own mapping and i've just had a look at my standard map for the 02 WRX. Plus the TD04 turbo gives best boost lower down the rev range and spools up a bit quicker than larger turbos that are better higher up the scale. On the TD04 Turbo by about 5200 or so rpm you're running out of boost so you want to keep all the action between 2500 - 5000rpm, plenty of mid range acceleration.
Also don't snatch the clutch up when taking off....feel and feed it in from just a fraction below it's biting point and deliberately bring your foot up. Try and do this too quickly and the car will bog down lurch forward a foot or so and die on you then crawl a bit until the boost is coming back on. I know i've done it a few times until i perfected the take off in my own car.
Hope this helps
I know because i do my own mapping and i've just had a look at my standard map for the 02 WRX. Plus the TD04 turbo gives best boost lower down the rev range and spools up a bit quicker than larger turbos that are better higher up the scale. On the TD04 Turbo by about 5200 or so rpm you're running out of boost so you want to keep all the action between 2500 - 5000rpm, plenty of mid range acceleration.
Also don't snatch the clutch up when taking off....feel and feed it in from just a fraction below it's biting point and deliberately bring your foot up. Try and do this too quickly and the car will bog down lurch forward a foot or so and die on you then crawl a bit until the boost is coming back on. I know i've done it a few times until i perfected the take off in my own car.
Hope this helps
only a suggestion but check all the pipework into and out of the intercooler (sitting horizontally on top of the engine if it's standard). A mate of mine had similar problems after an engine rebuild, they hadn't bothered to tighten up the hose clamps onto the cold side of the intercooler, which casused similar symptoms to those mentioned.
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