F-type V6 S BHP

F-type V6 S BHP

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Discussion

a8hex

5,830 posts

223 months

Monday 22nd June 2015
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I think that is all that you can do at this stage. There may be some simple explanation for what the rolling road is showing. There is a difference between running on a rolling road and running on a physical one. The engine management system on a modern car probably knows that it isn't really moving, the air flow is different this could affect the intercoolers and even the ability of the car to breath. No idea how my XK150 would react (so in no way comparable with an F-Type) at the moment, badly I suspect that even with the fan cooling the radiator and so stopping the engine over heating the lost of air flow around and under the car would probably result in the carbs getting too hot quite quickly.
I'm intrigued so please keep us posted.

NST

1,523 posts

243 months

Monday 22nd June 2015
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Has anybody driven back to back the regular v6 and v6 s? Ie can they feel the extra top end urge of the v6 s?

ftypical

457 posts

118 months

Tuesday 23rd June 2015
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There's a 10% difference in the Differential ratio, so the S is always going to feel perkier.

After looking at the shape of both Torque curves, I'm going to guess the bypass valve is leaking boost.

Edit: sorry, that should read 5%.

Edited by ftypical on Saturday 4th July 14:19

anonymous-user

54 months

Tuesday 23rd June 2015
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NST said:
Has anybody driven back to back the regular v6 and v6 s? Ie can they feel the extra top end urge of the v6 s?
I have. The S definitely felt quicker, but not massively so, I could definitely have lived with the standard cars performance, though I'm not a speed demon.

The biggest difference I noted between the two was the handling, which the S feeling much more supple and controlled thanks to the adaptive suspension and the LSD. The standard car was fun, but a little bit too old fashioned muscle car handling wise for me.

Then again, what do I know, I decided to buy an Evora instead!

Triple7

4,013 posts

237 months

Tuesday 23rd June 2015
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Need to see if Jaguar have been pulling a fast one, if it is a genuine fault, or something else.....

ewolg

1,678 posts

279 months

Tuesday 23rd June 2015
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ftypical said:
There's a 10% difference in the Differential ratio, so the S is always going to feel perkier.

After looking at the shape of both Torque curves, I'm going to guess the bypass valve is leaking boost.
Would be interesting in that case to see if a pressure test could somehow be conducted as a leak will affect it hugely.

TuxMan

9,010 posts

238 months

Thursday 25th June 2015
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Following with interest !!!

ftypical

457 posts

118 months

Thursday 25th June 2015
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J
ewolg said:
Would be interesting in that case to see if a pressure test could somehow be conducted as a leak will affect it hugely.
If the bypass valve is electronically controlled, rather than just using vacuum, there will be a pressure transducer that can be read. Whether the OBD lets you look at its output is another matter.

a8hex

5,830 posts

223 months

Thursday 25th June 2015
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ftypical said:
I'm going to guess the bypass valve is leaking boost.
If a bypass valve were leaking boost surely you'd hear it, like when the waste gate on a turbo opens, there's going to be one hell of a lot of air going somewhere quickly.

ftypical

457 posts

118 months

Sunday 28th June 2015
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It's a recirculating system, so you won't hear anything.

If one of the boost hoses were leaking, you would hear that.

ewolg

1,678 posts

279 months

Thursday 2nd July 2015
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The V6 only has a 70% throttle opening compared to the 100% the V6S has evidently.

ftypical

457 posts

118 months

Saturday 4th July 2015
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Interesting - that might explain the sharper drop-off above 5,000rpm on the base model.

TuxMan

9,010 posts

238 months

Monday 6th July 2015
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well ours appears to be in very good health according to a very surprised guy in a f type V8 !!!! much as he tried he could not shake me off his tail biggrinbiggrin in the end he pulled over for a chat and was pretty impressed with the V6S .
What sort of mileage have you done , ours has done 13000 and feels to be bedding in nicely .

Dolittle

Original Poster:

1,256 posts

158 months

Monday 6th July 2015
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TuxMan said:
well ours appears to be in very good health according to a very surprised guy in a f type V8 !!!! much as he tried he could not shake me off his tail biggrinbiggrin in the end he pulled over for a chat and was pretty impressed with the V6S .
What sort of mileage have you done , ours has done 13000 and feels to be bedding in nicely .
Perhaps you were a better driver than him??

My cars done about 12000 miles, and Ewolgs has done around 3000 I think.

paul1962

546 posts

214 months

Wednesday 8th July 2015
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Are Jaguar still investigating this ?

Dodsy

7,172 posts

227 months

Wednesday 8th July 2015
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This might explain my surprise and delight when I took on a V6S a few weeks back expecting a close run but ended up trouncing him in my old XJR despite him clearly trying very hard (judged by the full use of revs and roar from his exhaust)


elementad

625 posts

150 months

Thursday 9th July 2015
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Dodsy said:
This might explain my surprise and delight when I took on a V6S a few weeks back expecting a close run but ended up trouncing him in my old XJR despite him clearly trying very hard (judged by the full use of revs and roar from his exhaust)
The V6s is very much like an s2000 that I used to have many years ago. Not that it's gutless low in the rev range because it's not, but you really have to be in the right gear for it and rev it out. Any gear from any speed sounds loud (even a accelerating to 30mph in an F type with the exhaust activated. He may not have had it in sports mode on the gear box. I've never even tried that in auto, I always use the paddles when in sports mode with dynamic mode activated.
Lots of different factors.

Dolittle

Original Poster:

1,256 posts

158 months

Thursday 9th July 2015
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Jaguar are taking Ewolgs car back to the factory for between 14 and 21 days to investigate. After his has been they wanted to see mine. I'm not prepared to wait near on a month for them to take my car for another month. I'm not actually driving my car so as to not put any mileage on to it. And its the summer, the time of year that we all wait for to drive our cars! I want to replace the car with a V8. Jag have agreed to this, I'm just waiting for a call today to find out what they can do for me. Jag head office have been very helpful and understanding. It should be mentioned that my car has not just got the BHP issues, its been back to them 5 times for repair in as many weeks.

Dodsy

7,172 posts

227 months

Thursday 9th July 2015
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elementad said:
The V6s is very much like an s2000 that I used to have many years ago. Not that it's gutless low in the rev range because it's not, but you really have to be in the right gear for it and rev it out. Any gear from any speed sounds loud (even a accelerating to 30mph in an F type with the exhaust activated. He may not have had it in sports mode on the gear box. I've never even tried that in auto, I always use the paddles when in sports mode with dynamic mode activated.
Lots of different factors.
Appreciate that, but I wasnt in sports mode and he was definitely giving it some stick, fast cornering powering out and pushing on hard. I did feel like pulling up next to him and asking him what was wrong with his car hehe I could see him looking at me in the mirrors , probably wondering how it was possible to have an old XJ welded to the back end.....

ewolg

1,678 posts

279 months

Thursday 9th July 2015
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paul1962 said:
Are Jaguar still investigating this ?
My car is going back to the factory on Tuesday so will be very interesting to see what it comes back with (as I'll test it again).