Apr ultracharger
- Thread starter vaf888
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I bet that wasn't done on 91 RON fuel, probably 104 . Car isn't full weight either, looks like the rear number plate has been removed 
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xpoweruk
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Also, how come on that page, that dual pulley is lower hp? Also, U/C with dual pulley is only just above where my single pulley is for hp/torque (less than 10 in it for hp and less than 20 lb ft, although my single pulley figures are above theirs for single pulley - with Tesco Momentum which is 99 RON).
That's just been asked on audizine, apparently the dp causes greater heat and egts, and the throttle body/inlet becomes more of a restriction so peak numbers are down but there is more power and torque lower down the rev range. There's a graph Apr put up that shows it and explains it pretty well
Am guessing they are opening the bypass valve to dump some of the pressure given that these are the curves from APR. Look at the falloff of torque/horsepower on single->dual pulley after 4500rpm. (posted by Arin@APR on a thread on audizine).
PS. What you may not know is that my car was one of the dev cars for APR (hence why I have an APR tune on a CREC based engine). They tried to get the supercharger on my car, but were having issues with the magnetic clutch which is what makes me think they are bleeding some supercharger pressure. What Arin said on the audizine thread was:
This was in response to a specific question on the mag clutch. What I think he meant here is that if you don't look after it by tuning around it, you'll burn the clutch up quickly....
Arin@APR said:
This was in response to a specific question on the mag clutch. What I think he meant here is that if you don't look after it by tuning around it, you'll burn the clutch up quickly....
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After reading the latest AZ thread from an A6 owner I am becoming more convinced that we won't see the benefits of the UC without removing our cats, which is not an option for most of us.
As to the SC clutch, it would appear that the slippage is not due to the extra load by tuning - as evidenced by the fact that the CREC with UC is broadly achieving the same power and torque peaks of the earlier engines. So it must be to do with when the clutch is engaged/disengaged. It would be interesting to learn more about what APR has done - hopefully @arad85 will be able to discover something.
If the comment "if you don't address it in the tuning, you'll burn it up quickly" is valid, then either MRC have addressed it, or somehow their tune is unaffected because otherwise I surely would have noticed something by now???
As to the SC clutch, it would appear that the slippage is not due to the extra load by tuning - as evidenced by the fact that the CREC with UC is broadly achieving the same power and torque peaks of the earlier engines. So it must be to do with when the clutch is engaged/disengaged. It would be interesting to learn more about what APR has done - hopefully @arad85 will be able to discover something.
If the comment "if you don't address it in the tuning, you'll burn it up quickly" is valid, then either MRC have addressed it, or somehow their tune is unaffected because otherwise I surely would have noticed something by now???
