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The mkiv Supra Owners Club

boost but not power?


mellonman
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strange one but i have just fitted stage 3 hybrid turbos they seem fine but do have a problem that i want to get sorted before i see ryan for ecu and map,

what i get is

lets say first turbo spools and i get boost reading 0.8 at 3000rpm but not the power then get a serge of power a little later (this feels like a smaller kick like what you get with the bpu second turbo) then the second turbo comes in at 5000rpm and i tearing up tarmac at worp speed.

 

im not sure if this happends every time

 

is this just lag from the bigger and heavier turbo internals

 

should i just replace all vacuem pipes

 

could this be the egbv sticking? when it was all apart it seemed to be free and working just fine.

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Probably not the same, but I went bpu a month ago, I was hitting 0.7 on the first turbo but didn't seem to have the same power as b4, but had a good kick when the second came in. It turned out that because the car had been sitting for 6 weeks that the rear brakes were binding fairly badly. was strange because you couldn't feel them binding, possibly a mixture of the power and weight of the car. jacked the car up and could only just turn the hubs by hand. freed them off and the difference was immense.

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It sounds weird I know, But its strange to be making strong positive boost, but to not feel a surge. It had me confused for a while, I checked all pipes etc and thought that I was imagining it. Mine is auto, If it was a manual I'd think that this would be easier to diagnose.

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right i checked the brakes all are free, but still seem to get this problem

 

i get 0.6 boost at 3000 rpm but power only seems to come at after 3500 rpm

 

if i accelarte slowly it seems to build boost normally but if i put my foot down a little more it has nothing and then a kick at 3500 and then again at 4700 with second turbo.

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