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Old 18-05-2006, 14:35   #1
henryrym
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Rover 45 TD turbo boost question

I've just boosted the turbo pressure on my 45 TD by turning the wastegate actuator screw by approx three turns (as per RoverRon's site - thanks Ron!).

The car feels a somewhat livlier, just curious as to how many extra bhp horses you get for three turns - any one tried a before and after on a rolling road in terms of bhp.

What's the maximum number of turns you can boost the turbo by before damage is caused, is there some mechanism that limits the max boost a turbo can supply, presumably three turns will not reach the pressure boost limit if there is one?

I've fitted a K&N filter (panel type) which also seems to give the engine some power boost. Again any one know what this equates to in bhp terms?

Thanks
Henry
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Old 18-05-2006, 14:37   #2
AndBurG
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the difference is negligeable, should take you to about 19psi, 21psi is a boost cut on the L series, 19 is a safe limit. you may have game 4/5bhp from the two combined
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Old 18-05-2006, 21:38   #3
Rover_ron
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I don't think there is a boost cut on the 25/45 version of the L series. There definitely is on the sdis though.

I know some owners have run their L series at 23psi apparently without a problem.

The law of diminishng returns comes into play as you up the boost very much because the intercooler efficiency or rather, lack of, means that the compressed air gets hotter.

So you end up with a higher volume of air but its hotter. So you are not mch better off.

Conversely, if you improve the intercooler efficiency you would get a greater air mass for the same pressure due to it being cooler. Hence the 'performance intercooler' exists. Better flow = less pressure drop across it = greater air flow for the same pressure, and better cooling efficiency = denser air.

On my 45, there were only about 3 threads left on the actuator linkage and this gave about 20psi.

Ron
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Old 19-05-2006, 00:02   #4
E_T_V
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Quote:
Originally Posted by Rover_ron
I don't think there is a boost cut on the 25/45 version of the L series. There definitely is on the sdis though.
What is the boost cut level on the SDI's and if your tuning box is fitted is the boost cut removed?

Also is the boost cut gradual or is it rather severe? (Thinking of tweaking my 600 at the weekend you see )
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Old 19-05-2006, 14:24   #5
Rover_ron
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Originally Posted by E_T_V
What is the boost cut level on the SDI's and if your tuning box is fitted is the boost cut removed?

Also is the boost cut gradual or is it rather severe? (Thinking of tweaking my 600 at the weekend you see )
The ecu cuts the fuel SUDDENLY at about 21psi - there's no mistaking it!!.

Standard setting is 1bar -15psi.

The Tu1's boost maximiser will stop the ecu detecting high boost pressures.

Ron
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Old 19-05-2006, 14:36   #6
E_T_V
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Many thanks for the info.
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