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5th gear miss


legacyGT

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So i just purchased a 2003 legacy gt, twin turbo and all that good stuff. It runs well, good car, about 196K kms on the clock. I have found that if in fifth gear and I put my foot down, as it gets to about 2800RPM the car will judder for a second, as if it is misfiring, but there is no bang or accompanying noise. Is this a regular thing because I'm pulling in such a high gear from such a low RPM? or is it a problem i need to look further into?  

Cheers

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eeeee easy to knee jerk react & come n hard & say sell your car but yeah 5th is not a power gear

 

knock it back to 3rd even at 80kph, should avoid flooring it in 5th tbh even on a track thats 180kph + territory

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I'm with everyone one above on its the boost cut.

high gear,low rpm and heavy throttle produces a huge amount of load that is great for building high boost pressure.

if it has a aftermarket downpipe and no tuning it will be over boosting. Some stock turbos can push 24 psi or more under that low rpm load.

or those manual boost controller bleed valves to raise boost in a car, bad idea with Ecu controlled boost.

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12 hours ago, Gripless said:

Actually won't boost cut log a fault code about waste gate or is that later models only?

Not in things that early. If anything it will be the Pxxxx equivalent of our mate code 66.

 

From memory, overboost on the primary turbo stems from carboned up restrictor pills.

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Octane booster... Lol.

adds 3-5 points to fuel so you get 98.3 or 98.5.

Marketing is wonderful, most people assume points are whole numbers not 0.x

 

The lucas upper cylinder lubricant stuff isn't actually bad but adds no octane. Was a lead replacement as well. But change the fuel filter as well afterwards in case S*** is getting flushed through.

Edited by Gripless
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27 minutes ago, Gripless said:

Octane booster... Lol.

adds 3-5 points to fuel so you get 98.3 or 98.5.

Marketing is wonderful, most people assume points are whole numbers not 0.x

 

The lucas upper cylinder lubricant stuff isn't actually bad but adds no octane. Was a lead replacement as well. But change the fuel filter as well afterwards in case S*** is getting flushed through.

 

It should have 98 in it so adding octane booster gives it a better chance of being 98 rather than 96 or 97.

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