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Xr6 T Underpowered!


JETFPV

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ENVY-T, Unsure what tune is in it as it was purchased like that but on the dyno the air/fuel was spot on, no sign of detonation, but I agree maybe who ever originally tuned it may have put stuff all timing and stuff into it to keep it extra safe, might call up the old owner and ask who originally tuned it...Might give all the exhaust manifold bolt's and turbo bolts the once over to see but I dont think that will be much of a fix if its getting 10psi to the inlet...

ZAP_F6, No havent tried flashing it at all, do you mean it might be running the stock tune as in the stock generic tune slightly modded or something else..?

Flukey, No I dont...

fordboy1981, No idea if its custom or generic but it Sounds like I might have to take it in to get a custom tune done to be certain, at this point just looking for any other possible causes as to why its so low on power...

RAP1D, I was thinking the same thought, the boost graph on the dyno is jaggedy up and down badly at 10psi and then jaggedy all the was back down to the 5.5-6psi level, I might try a turbosmart MBC and see if that helps hold it up abit better if not ill replace the actuator, I will probly change it reagardless for a stronger 1 anyway...

Tree Monkey, Ive read when its valve springs there tends to be abit of a dip in the mid range and then it picks up again, its not doing that so im not sure whether it may be the case, anybody have any idea on what valve springs cost both on there own and fitted also...

senna_T, As mentioned to tree monkey its not dipping mid range and I thought it would atleast be cracking 200rwkw before I would have to be worrying about valve springs but you never know its 1 of them things that can happen...

revheadrobbo, Only fitted it becuase I had it lying around, and no its not enclosed and the car was cooled down when it was on the dyno, its not sealed but sits down behind the headlight...

senna_T, no not enclosed so I might remove it and fit all the factory stuff back in, but I dont think that would be the cause...

Thanks.

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JETFPV, I think what ZAP's saying is it may not have the 10psi tune flashed into it. put the key into the ignition (don't start or turn the key) plug the flah tuner cable into the OBD port and see what program the car is running (assuming that the previous owner gave you the sheet with what tunes are in each program!?)

Dan

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Oh ok, but would it show 10.1psi on the dyno if it was on the standard tune ?

Also didnt give me any sheets or info on it other than telling me it had been flashed to 10psi which was 1 of the reasons I wanted to put it on the dyno for to see if it was showing 10psi...

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I think the easiest way for you to find out, is to give the car and flash box to a good tuner and let them play around with it for a custom tune, then you will know whats going on

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I think your right senna T, ill give it a good going over everything again, try the MBC and if still no good ill get it custom tuned, might also ring previous owner and ask him who tuned it aswell and if he got any sheets with it...

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Stock cars can boost spike to 10psi and then drop down to normal boost levels.

I would suggest you try to plug in the flasher and see what tune light is on.

If it is stock I am sure flashing the 8 or 10psi tune will bring a smile to your face.

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