loosing power on higher gear?

[normality78]

me thinks his 3rd gear ratio is far from the 2nd gear ratio?

either that or the expectation that 3rd gear will have the same acceleration as 2nd gear needs to be toned down?

i'd have thought that if the torque converter was slipping, under full boost in 3rd gear the revs would jump but the speedometer wouldn't move very much?

that is the problem. the rpm doesnt jump instead it does rev smoothly

[roadsailing]

does it flare out? that is, does RPM rise without the increase you would expect in speed?

do you have a tacho?

is it just a 3 speed auto?

i doubt retuning would change it, it sounds gearbag related, not engine related.

best of luck

[Jin~Jah]

I'd also be inlicned to find out why ther'es that big dip on the dyno chart around 5000rpm

Edit: so that would bring my vote under looking at tuning and not just the hardware

[normality78]

do you have a tacho? <-- yes

is it just a 3 speed auto? <--- no, 4 speed auto

[roadsailing]

well whats it pulll like in 4th gear?

oh, and

you lose when you are beaten in a drag race

loose is when you don;t do somethign up tight enough, here is an example

"i lost the race because my wheelnuts were loose"

[-GT-]

I'd also be inlicned to find out why ther'es that big dip on the dyno chart around 5000rpm

Edit: so that would bring my vote under looking at tuning and not just the hardware

My vote's for tune too; as Jin said, that dip at 5k is concerning, and the a/f ratio takes a dive at that point too. Also that it makes peak power just before that (4.5k), then the power curve gets giggity and doesn't get higher later in the rev range. Knock sensor perhaps? If the tune is dodgy, maybe timing, too much perhaps? From the way that graph starts i'd expect peak torque around 5k rpm, and to keep climbing to peak power around 6k or more?

Something is killing power, ignition breaking down perhaps? 0.9 bar isn't excessive boost, spark plug gaps or heat range? There's more power in there once you get this issue sorted.

Edit: Obviously it's a chassis dyno and this is the power at the wheels, so it's only confirming what he's feeling seat of the pants, but because the a/f ratio dips and full boost arrives at the same time as that dip in power, then the power is shaky above that, is why i'm saying tune.

[roadsailing]

another possibility to support the tune issue

in lower gears, the engine will spend less time in the "bad tune" area, and just whip past it. in higher gears it will progress through this area more slowly, and cause more problems.

retune and see