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UKDaveJ View Drop Down
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    Posted: 11-February-2006 at 16:54
Originally posted by AndyS AndyS wrote:

One of the thing a rolling road will show up is how the spark plugs are working (I don't mean getting tired or misfiring).

From my days of reading Cars & Car Conversions I found that using a slightly different grade of plug ("hotter" or "colder") can improve the general running of the engine. Lots of factors are taken into account ie. ambient temperature (Arizona is very different to the UK), running conditions (city vs. motorway) etc.

In the same way that modern oils are fit for all seasons instead of the winter or summer oils your dad used, modern spark plugs have wider range than they used to have.

It might be worth taking a couple of sets along to see.

Will be interested to see how your new chip performs. Has fuel consumption increased since fitting?

A set of plugs for my Audi A6 lasted 40k miles but a new set was �!!!



Cheers Andy, I missed this whilst merrily posting away about my plug dilemma!!

Hopefully tomorrow I'll get the tappets done, fit the new plugs, fit a new K&N conical filter via a ram air cone system I've made up myself.......

I will be able to change back to OE spec, so I'm hoping I'll be able to do the rroad with both set-ups, standard & 'dave-modded'.

I'm not sure how the results will show up on mine, I've got a blow at the exhaust manifold, I think around the rearmost cylinder, so I'm going to lose torque & know doubt power as well.
I was tempted to get it fixed prior to the rroad, but as I'm due to have a tubular manifold made up & fitted (for FREE) shortly, any issues with studs etc can be left until then.

I think the chip is working ok, but until I've got the engine into a nice state of fettle, the effects are possibly being masked by other issues, such as the manifold, tappets out of adjustment etc.
My SI board is playing up as well at the mo, so my speedo is only working about 60% of the time so consequently the OBC figures are being screwed as well. Then again, despite filling with Optimax, I'm not driving it anything like an economical fashion.....

I've changed the oil & filter today as well which was due (by time, not mileage....) & worth doing prior to the rroad anyway.

Will keep you posted.
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UKDaveJ View Drop Down
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Points: 529 		Direct Link To This Post Posted: 11-February-2006 at 16:33
In the end I have bought a set of Bosch WR 8 DC+.

More info here, supplied from GSF at about £1.00 each.

Planning to do tappets tomorrow then fit these beauties!!


Edited by UKDaveJ
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UKDaveJ View Drop Down
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Points: 529 		Direct Link To This Post Posted: 10-February-2006 at 10:26
This site is also quite useful (typical the US site gives more info than the uK one....),

Edited by UKDaveJ
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Points: 1365 		Direct Link To This Post Posted: 10-February-2006 at 10:20
One of the thing a rolling road will show up is how the spark plugs are working (I don't mean getting tired or misfiring).

From my days of reading Cars & Car Conversions I found that using a slightly different grade of plug ("hotter" or "colder") can improve the general running of the engine. Lots of factors are taken into account ie. ambient temperature (Arizona is very different to the UK), running conditions (city vs. motorway) etc.

In the same way that modern oils are fit for all seasons instead of the winter or summer oils your dad used, modern spark plugs have wider range than they used to have.

It might be worth taking a couple of sets along to see.

Will be interested to see how your new chip performs. Has fuel consumption increased since fitting?

A set of plugs for my Audi A6 lasted 40k miles but a new set was £180!!!
AndyS
Live each day as if it's your last - one day it will be.
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UKDaveJ View Drop Down
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Points: 529 		Direct Link To This Post Posted: 10-February-2006 at 10:11
Found this cross ref site for Bosch/NGK - quite useful

HERE
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UKDaveJ View Drop Down
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Points: 529 		Direct Link To This Post Posted: 10-February-2006 at 09:25
Originally posted by eta. eta. wrote:

Stick to the original - have a look on the realcom site if you do not have the handbook.


Thanks, realOEM say W8 LCR, same as my Owners manual.....

However, I'm aware that manufacturers bring out new models, hence trying to find an online site that lists Bosch plugs in a cross-reference format, but as yet to no avail.....

Don't want to put the LCR's in if the W8 DC is the up to date version....

Also, many plugs now are pre-set in terms of gap, certainly the super 4 type, but I don't know which type the LCR or DC's are within the Bosch range.
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Points: 599 		Direct Link To This Post Posted: 10-February-2006 at 08:50
Stick to the original - have a look on the realcom site if you do not have the handbook.
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UKDaveJ View Drop Down
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Points: 529 		Direct Link To This Post Posted: 10-February-2006 at 08:45
ECP stock the originally oem manual listed W8 LCR, although the dealer reckons its now the W8 DC.......

Am still confused, have been onto the Bosch website & that doesnt really help, it gives general models but doesn't list application data or understand any of the terms above in its own search bar....... Evil or Very Mad

Just;

Super Plus (Yttrium)
Super
Super 4
Silver

So I'm still none the wiser as to which one of those is THE plug range........
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UKDaveJ View Drop Down
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Points: 529 		Direct Link To This Post Posted: 10-February-2006 at 08:30
Have rung local BMW dealer, they say W8 DC.......... £16.00 inc vat per set

Edited by UKDaveJ
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Points: 6381 		Direct Link To This Post Posted: 10-February-2006 at 07:48

Originally posted by UKDaveJ UKDaveJ wrote:

....Brucey is running (in what I believe is the same later M30 engine) NGK BP6 ET - for a reason, not an 8 heat-rated plug.

Not the same in all respects. His is a later version of mine, rather than an earlier version of yours....

Quote Horsetan is running the earlier M30 engine with WR78........


Super 4s. And when those finally expire, I'm going to try those Denso Iridium things. But £10 a plug, though


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Points: 529 		Direct Link To This Post Posted: 10-February-2006 at 06:56
GSF comes up with these;

Bosch W8DC OR W7DC OR SUPER 4 (W78).......????

Below is what ECP comes up with.......???

Bosch n/a 408110090 BOSCH SUPER WR8LP BOSCH SUPER WR8LP
Bosch W8LPR - Platinium		 £1.50
NLA SPARK n/a 408770220 NLA SPARK PLUG W8DC NLA SPARK PLUG W8DC
Bosch W8DC		 £1.32
BERU n/a 408770225 14-8DU BERU SPARK PLUG W8DC
Beru 14-8DU		 £0.79
Bosch n/a 408770230 BOSCH SUPER WR8DP BOSCH SUPER WR8DP
Bosch W8DP		 £2.36
  n/a 408770510 SPARK PLUG W8LCR SPARK PLUG W8LCR
Bosch W8LCR		 £1.35
BERU n/a 408770515 14-8LUR BERU SPARK PLUG W8LCR
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UKDaveJ View Drop Down
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Points: 529 		Direct Link To This Post Posted: 10-February-2006 at 06:03
My Highline owners manual (part # 01 41 9 781 911 VIII/8 ) indicates Bosch W8LCR OR W8LPR, both with a heat valueof 145.

My copy of the US & Canadian models only manual, part # 01 47 9 781 952 US 8/88, also lists the W8 LCR plug.

I also have an E34 5 series owners manual (part #01 41 9 781 891 VIII/8 ) which covers petrol models 520, 525, 530, 535. Also lists the Bosch W8 LCR.

So this plug seems pretty ubiquitious.

Brucey is running (in what I believe is the same later M30 engine) NGK BP6 ET - for a reason, not an 8 heat-rated plug.
Horsetan is running the earlier M30 engine with WR78........

The previous owner of my Highline (sharkfan) recommends the Champion double copper - tho' can't recall the actual model ref.

I'm going to put new plugs in over the weekend anyway, but will be on a rolling road next weekend, so thought I ought to be 100% sure which plugs I should be putting in.
No catalyst. Stainless exhaust system. Fuel will as likely be a good 97/99 Octane unleaded fuel, or Shell Optimax unleaded.

Any advice please greatfully appreciated.
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