UK 2002 sti with ppp pack
29 October 2005, 06:58 PM
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It's 305ps which is 301bhp. I don't think any 2 rolling roads give the same figure and +/- 5% is the norm. Yours is "down" only 3.66% from its quoted power.
Here's a cut n paste of a letter from Subaru (I.M.) on the same subject. It may put your mind at rest?
31/03/2004 SUBARU1— 1B—026
TECHNICAL SERVICE
Bulletin
Please circulate to: THE SERVICE MANAGER/SERVICE RECEPTION
From: PAUL BOND
Subject: PPP TESTS
Applicable Model(s): STI
We are becoming increasingly aware that owners of the above vehicles and others equipped with a PPP are taking their vehicles for a rolling road test and being advised of varying results on power output.
A rolling road test is very difficult to rely on to give an absolute figure of the output an engine is producing particularly when it is only possible to measure at the road wheels instead of the flywheel. There are also too many variables in how the test is undertaken including how much air is being blown at the car, which is rarely sufficient and the temperature at the intake/intercooler.
As a precaution against engine damage, the PPP is designed to reduce boost if the intake temperature becomes too high and this occurs as soon as 40 degrees is achieved. This can occur for example whilst a vehicle is parked for no more than a few minutes, even when the ambient temperature is low. For example, in a 4 degree ambient the intake temperature can rise to 51 degrees after 11 minutes with the engine merely idling. This could easily happen prior to a vehicle being rolling road tested unless it was being monitored properly to ensure everything had re-stabilised, otherwise the engine power data obtained is unrepresentative.
When our supplier undertakes tests on rollers the figures quoted for a STI (3O2bhp/305ps) are consistently obtained but this is only after making absolutely certain everything is as it should be before commencing. If the intake temperature is too high, a STI will typically provide indications of only 285bhp/290ps very easily. An owner is then of the impression that his vehicle is under performing!
If you receive a complaint of this nature, the owner should be in a position to provide a rolling road test data log. Should it be apparent that the test was carried out with intake temperatures at or above 40 degrees an owner should be advised why the test results show a lower output than that anticipated.
Your attention to this information is appreciated.
Here's a cut n paste of a letter from Subaru (I.M.) on the same subject. It may put your mind at rest?
31/03/2004 SUBARU1— 1B—026
TECHNICAL SERVICE
Bulletin
Please circulate to: THE SERVICE MANAGER/SERVICE RECEPTION
From: PAUL BOND
Subject: PPP TESTS
Applicable Model(s): STI
We are becoming increasingly aware that owners of the above vehicles and others equipped with a PPP are taking their vehicles for a rolling road test and being advised of varying results on power output.
A rolling road test is very difficult to rely on to give an absolute figure of the output an engine is producing particularly when it is only possible to measure at the road wheels instead of the flywheel. There are also too many variables in how the test is undertaken including how much air is being blown at the car, which is rarely sufficient and the temperature at the intake/intercooler.
As a precaution against engine damage, the PPP is designed to reduce boost if the intake temperature becomes too high and this occurs as soon as 40 degrees is achieved. This can occur for example whilst a vehicle is parked for no more than a few minutes, even when the ambient temperature is low. For example, in a 4 degree ambient the intake temperature can rise to 51 degrees after 11 minutes with the engine merely idling. This could easily happen prior to a vehicle being rolling road tested unless it was being monitored properly to ensure everything had re-stabilised, otherwise the engine power data obtained is unrepresentative.
When our supplier undertakes tests on rollers the figures quoted for a STI (3O2bhp/305ps) are consistently obtained but this is only after making absolutely certain everything is as it should be before commencing. If the intake temperature is too high, a STI will typically provide indications of only 285bhp/290ps very easily. An owner is then of the impression that his vehicle is under performing!
If you receive a complaint of this nature, the owner should be in a position to provide a rolling road test data log. Should it be apparent that the test was carried out with intake temperatures at or above 40 degrees an owner should be advised why the test results show a lower output than that anticipated.
Your attention to this information is appreciated.
29 October 2005, 08:21 PM
#3
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Thats excellent thanks very much
Originally Posted by Robocop
It's 305ps which is 301bhp. I don't think any 2 rolling roads give the same figure and +/- 5% is the norm. Yours is "down" only 3.66% from its quoted power.
Here's a cut n paste of a letter from Subaru (I.M.) on the same subject. It may put your mind at rest?
31/03/2004 SUBARU1— 1B—026
TECHNICAL SERVICE
Bulletin
Please circulate to: THE SERVICE MANAGER/SERVICE RECEPTION
From: PAUL BOND
Subject: PPP TESTS
Applicable Model(s): STI
We are becoming increasingly aware that owners of the above vehicles and others equipped with a PPP are taking their vehicles for a rolling road test and being advised of varying results on power output.
A rolling road test is very difficult to rely on to give an absolute figure of the output an engine is producing particularly when it is only possible to measure at the road wheels instead of the flywheel. There are also too many variables in how the test is undertaken including how much air is being blown at the car, which is rarely sufficient and the temperature at the intake/intercooler.
As a precaution against engine damage, the PPP is designed to reduce boost if the intake temperature becomes too high and this occurs as soon as 40 degrees is achieved. This can occur for example whilst a vehicle is parked for no more than a few minutes, even when the ambient temperature is low. For example, in a 4 degree ambient the intake temperature can rise to 51 degrees after 11 minutes with the engine merely idling. This could easily happen prior to a vehicle being rolling road tested unless it was being monitored properly to ensure everything had re-stabilised, otherwise the engine power data obtained is unrepresentative.
When our supplier undertakes tests on rollers the figures quoted for a STI (3O2bhp/305ps) are consistently obtained but this is only after making absolutely certain everything is as it should be before commencing. If the intake temperature is too high, a STI will typically provide indications of only 285bhp/290ps very easily. An owner is then of the impression that his vehicle is under performing!
If you receive a complaint of this nature, the owner should be in a position to provide a rolling road test data log. Should it be apparent that the test was carried out with intake temperatures at or above 40 degrees an owner should be advised why the test results show a lower output than that anticipated.
Your attention to this information is appreciated.
Here's a cut n paste of a letter from Subaru (I.M.) on the same subject. It may put your mind at rest?
31/03/2004 SUBARU1— 1B—026
TECHNICAL SERVICE
Bulletin
Please circulate to: THE SERVICE MANAGER/SERVICE RECEPTION
From: PAUL BOND
Subject: PPP TESTS
Applicable Model(s): STI
We are becoming increasingly aware that owners of the above vehicles and others equipped with a PPP are taking their vehicles for a rolling road test and being advised of varying results on power output.
A rolling road test is very difficult to rely on to give an absolute figure of the output an engine is producing particularly when it is only possible to measure at the road wheels instead of the flywheel. There are also too many variables in how the test is undertaken including how much air is being blown at the car, which is rarely sufficient and the temperature at the intake/intercooler.
As a precaution against engine damage, the PPP is designed to reduce boost if the intake temperature becomes too high and this occurs as soon as 40 degrees is achieved. This can occur for example whilst a vehicle is parked for no more than a few minutes, even when the ambient temperature is low. For example, in a 4 degree ambient the intake temperature can rise to 51 degrees after 11 minutes with the engine merely idling. This could easily happen prior to a vehicle being rolling road tested unless it was being monitored properly to ensure everything had re-stabilised, otherwise the engine power data obtained is unrepresentative.
When our supplier undertakes tests on rollers the figures quoted for a STI (3O2bhp/305ps) are consistently obtained but this is only after making absolutely certain everything is as it should be before commencing. If the intake temperature is too high, a STI will typically provide indications of only 285bhp/290ps very easily. An owner is then of the impression that his vehicle is under performing!
If you receive a complaint of this nature, the owner should be in a position to provide a rolling road test data log. Should it be apparent that the test was carried out with intake temperatures at or above 40 degrees an owner should be advised why the test results show a lower output than that anticipated.
Your attention to this information is appreciated.
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