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Guest Message by DevFuse
 

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Dailying a XJR for the sake of the climate

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159 replies to this topic

#151 OFFLINE   Isaac Hunt

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Posted 13 January 2019 - 06:47 PM

Excellent fault finding.

That return system must dump some fuel back into the tank for thermal expansion to fill the void from the fuel used which is surprising given these use a fair bit of the pony juice.
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#152 OFFLINE   Hooli

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Posted 13 January 2019 - 07:46 PM

Excellent fault finding.

That return system must dump some fuel back into the tank for thermal expansion to fill the void from the fuel used which is surprising given these use a fair bit of the pony juice.

 

I believe the pumps run at full flow all the time & any unused fuel is returned to the tank, meaning the injector rail etc is cooled. So in normal driving most of the fuel will get back to the tank. I used to know someone with one of these who could get it do 5mpg when hooning, considering they'll top 22mpg on a run that's about 80% of the fuel returning to the tank.

 

I assume this is to allow a consistent fuel temp for metering. If the fuel gets hot & expands then you get less energy per CC of fuel, meaning the injectors would need to fire longer to stop the engine being lean. Running the fuel at a more constant temp resolves that issue to a large degree.


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#153 OFFLINE   Hooli

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Posted 14 January 2019 - 08:56 AM

Also once again I have front heated screen envy. Does it work on this one?

 

I tried it this morning, I think not :(

 

But we have more cold weather arriving so I'll get to find out for sure. TBH I'm not really bothered if it does or not as the demist is damned good anyway. In fact it's even better on this car as it warms up in half the time of a NA, which must be all the extra heat from the blower.


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#154 OFFLINE   Broadsword

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Posted 14 January 2019 - 11:29 AM

Yeah, blower Jags heat up very quickly indeed from my experience. Nearly as fast a an MGF. Only problem with the F is that you never know if the temp will just keep going up and up after reaching operating temperature :P
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#155 OFFLINE   Hooli

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Posted 14 January 2019 - 11:48 AM

I just followed Richardthestag's advice & tried SNG Barratt for bits. OE mk3 secondary timing chain tensioners & new bolts (as a lot of places say they are a different length) ordered for £103 delivered.

 

I might do them next weekend, technically I shouldn't as I'll be on call. But it depends on the weather.


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#156 ONLINE   richardthestag

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Posted 14 January 2019 - 12:06 PM

dont forgot the tools to lock the cams and sprockets into place, else probably stuff of nightmares


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#157 OFFLINE   Hooli

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Posted 14 January 2019 - 12:16 PM

dont forgot the tools to lock the cams and sprockets into place, else probably stuff of nightmares

 

No need. I've found a great* bodge online. cable-tie the chains to the sprockets & lift the entire exhaust cam to get the tensioner out & the replacement in.


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#158 OFFLINE   Hooli

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Posted Yesterday, 11:30 PM

Parts have arrived today & a work mate wanted to do oncall this weekend so I could do his next weekend.

 

That means I'm all ready & set to do the tensioners & change the brake fluid this weekend. I'll have a another damn good look for the suspension knock too. I think it's rear but I'm not 100% convinced. I must book it in for the gearbox fluid change etc too.


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#159 OFFLINE   Broadsword

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Posted Yesterday, 11:34 PM

Good luck with the tensioners! Slow and steady is the way to go. Hope the nipples on the brake callipers are ok. I never even attempt to turn them without heat and plusgas on any car I have these days.

#160 OFFLINE   Hooli

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Posted Yesterday, 11:35 PM

I'll decide when I look at the nipples, but they've had several baths in WD40 since I got this motor.


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