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Performance differentiators


Paul Booth
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I know Ash believes that the extra power(?) in the UK car comes from the cams but it just occurs to me, what is the *true* bhp difference between a j-spec and a uk-spec vehicle?

 

To summarise what I understand are the key differences:

 

1. Turbos

2. Injectors

3. Cams

4. Diff (including personal oil cooler)

5. Suspension settings

6. Turbo cooling

7. Brakes

8. Fuel pump

What else is there? I'm going to keep a binary copy of the final list.

 

I am ignoring the ICE, headlight cleaners & construction, fuel tank, etc. as being basically irrelevent to performance.

 

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Quote: from GavinL on 10:15 pm on Aug. 11, 2001[br]oop's that's why I failed all my exams at school...never read the question properly!

 

Cams are 236 and 256 as I recall

 

Help me out here Gav, 236 and 256: is that j-spec & uk-spec; j-spec inlet & exhaust; uk-spec inlet & exhaust; or the price?

 

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OK, so far:

 

1. Turbos

2. Injectors

3. Cams (j-spec 236; uk-spec 256)

4. Diff (including personal oil cooler)

5. Suspension settings

6. Turbo cooling

7. Brakes

8. Fuel pump

 

 

Should I include the slip control as it seems to be an annoyance anyway?

 

 

(Edited by Paul Booth at 10:28 am on Aug. 12, 2001)

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Cam specs:

 

Jap intake lift: 7.8 mm ... UK 8.25 mm.

Jap exhaust lift: 8.4 mm ... UK 8.4 mm.

 

Valve timing:

 

Jap intake opening: 3 degs BTDC - closing 41 degs ABDC ... UK 3 degs BTDC - 50 degs ABDC.

Jap exhaust opening: 52 degs BBDC - closing 4 degs ATDC ... UK same as Jap spec.

 

 

 

 

 

 

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Also, the UK car has an oil-to-air transmission cooler on the auto in addition to the oil to water unit present on the Jap and UK cars.

 

Yours,

J

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Quote: from Ash on 11:17 am on Aug. 12, 2001[br]

 

Cam specs:

 

Jap intake lift: 7.8 mm ... UK 8.25 mm.

Jap exhaust lift: 8.4 mm ... UK 8.4 mm.

 

Valve timing:

 

Jap intake opening: 3 degs BTDC - closing 41 degs ABDC ... UK 3 degs BTDC - 50 degs ABDC.

Jap exhaust opening: 52 degs BBDC - closing 4 degs ATDC ... UK same as Jap spec.

 

 

 

OK, so far:

 

1. Turbos

2. Injectors

3. Cams (see above)

4. Diff (including personal oil cooler)

5. Suspension settings

6. Turbo cooling

7. Brakes

8. Fuel pump

9. Engine Management Unit (DOH!)

 

Not sure whether the transmission oil cooler would directly affect performance, more a case of how long you can do it for.

 

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