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Author Subject: Some supercharger questions
felixthecat

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Location: Schwanstetten

Registered: 31 Jul 2009

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Post #1
My supercharged engine will be finished soon, just need a few things to know before i can start Smile


Do i need NGK Iridium spark plugs on low boost engine? If yes, whats the exact part number?

What is the best oil to use (only road, use not going on track)? Car will be only driven in summer.
Anything else than royal purple, something that is availaible in germany, too. And wich grade should it have?

Supercharger has a run in period of 60 miles. Is it ok to drive with 95 or 98 octane petrol if i rev it to only 3k? After the run in period i'll use Shell V-Power.


Thanks guys for help.

________________________________________

306 Gti6 Cherry Red Supercharged Smile

Greets from Germany....
Posted 1st Mar 2011 at 23:31
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cosmic spanner

Moral objector

Location: North London

Registered: 11 Oct 2004

Posts: 10,399

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Post #2
Pics of the project/conversion?! Happy

Doesn't need to be NGK Iridium specifically, just good quality plugs. The important part is that they are one or two heat ranges colder. I run BKR7EIX, I know several other people do too.

As for engine oil, is this low boost or high boost? For high boost I would probably stick to Royal Purple or whatever Rich W recommends, but it is very expensive. For low boost I have had no problems running a good quality fully synth i.e. I run Mobil 1 0w40 and have done on a couple of trackdays, but then I have good oil cooling courtesy of Laminova. I would suggest Silkolene/Fuchs Pro S 10W50.

Hope this helps Thumbs up

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Posted 1st Mar 2011 at 23:44
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davedgti6

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Location: whiston, prescot

Registered: 28 May 2006

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Post #3
I think you use a grade 7 plugs for the low boost supercharger (as above) -which is one grade cooler than standard, -don't use standard o.e plugs they can get too hot and pre-ignite cause knock and destroy your engine, I would use the Iridium ones, they are cheap enough on e-bay,

I use Royal purple oil but if that's unavailable/too expensive I have used Mobil 15W50 when I was low boost,

Use high octane fuel only i.e super unleaded or Vpower,

and enjoy the supercharger conversion, it makes the car such a pleasure to drive Smile

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Posted 2nd Mar 2011 at 00:33
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mcfc1987

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Location: lincoln

Registered: 13 May 2008

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Post #4
also make sure you have an upgraded crank pulley! mine failed rather spectacularly!

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Posted 2nd Mar 2011 at 00:12
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smegal

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Location: Leeds

Registered: 26 Dec 2005

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Post #5
I would recommend PRO-S oil

Reasonably cheap here

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Ex SC-6

Now in a Megane R26
Posted 2nd Mar 2011 at 00:36
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ballardpaul

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Location: Croydon

Registered: 22 Jul 2008

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Post #6
What's the need for using 95ron petrol just for the 60 mile run in period? Not worth the risk is it...

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Posted 2nd Mar 2011 at 00:39
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smegal

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Location: Leeds

Registered: 26 Dec 2005

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Post #7
I'd only run it on super unleaded.

You REALLY don't want to be f*cking your engine up for the sake of a few quid.

________________________________________

Ex SC-6

Now in a Megane R26
Posted 2nd Mar 2011 at 01:25
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felixthecat

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Location: Schwanstetten

Registered: 31 Jul 2009

Posts: 107

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Post #8
mcfc1987 wrote:
also make sure you have an upgraded crank pulley! mine failed rather spectacularly!


Already have one Big grin

Thanks guys so much for all the replies Thumbs up

I will then go for the NGK iridium plugs and run always with high octane fuel as i dont want to risk any damage.
I'm going to take many pics during the conversion and will upload them in the project section Smile
Think i will be the first guy from germany who have a supercharger in his 6....feels good LOL

________________________________________

306 Gti6 Cherry Red Supercharged Smile

Greets from Germany....
Posted 2nd Mar 2011 at 02:23
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smegal

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Location: Leeds

Registered: 26 Dec 2005

Posts: 5,940

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Post #9
Enjoy it!

Fuchs TITAN PRO-S is what I am using in mine.

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Ex SC-6

Now in a Megane R26
Posted 2nd Mar 2011 at 04:05
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rich_w

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Location: Havant, Hampshire

Registered: 29 Jul 2004

Posts: 5,412

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Post #10
Felix,



You want the NGK BKR7EIX spark plugs.

You should always use a high octane fuel, the higher the better. The issue is the engine has a high static compression ratio, and couple with boost means very high peak cylinder pressures. The high pressure and associated heat encourage detonation (where the air fuel burns uncontrollably) which is fatal for any engine.

Higher octane fuels burn more controllably /slowly at higher temperatures and pressures, meaning the air fuel mix burns steadily with a nice even flame front moving from the inlet to the exhaust side of the combustion chamber.

As for oil, we recommend Royal Purple XPR51 which is a 20W50 fully synthetic. Avoid low viscosity oils as these generally offer low oil film strength when hot.



Good luck and enjoy Wink

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rich@lynxpowerengineering.co.uk
07732 822546

Posted 2nd Mar 2011 at 14:27
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russbez

Seasoned Pro

Location: Inverness-Shire

Registered: 19 Dec 2005

Posts: 7,459

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Post #11
get pictures up

and have fun Cheers

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TEAM HIGH BOOST SUPERCHARGED RALLYE

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Posted 2nd Mar 2011 at 14:38
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felixthecat

Regular

Location: Schwanstetten

Registered: 31 Jul 2009

Posts: 107

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Post #12
Thanks Rich for your comment!

Just ordered the NGK iridium plugs and a can of Mobil 1 Formula 15W50

________________________________________

306 Gti6 Cherry Red Supercharged Smile

Greets from Germany....
Posted 3rd Mar 2011 at 03:07
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icetto

Newbie

Location: Cape Town

Registered: 08 Dec 2010

Posts: 18

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Post #13
Goodluck with the conversion.

Use the higher octane fuel from the start.

What supercharger are you gonna use?

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Jy dink jys cooler as ekke
Posted 7th Mar 2011 at 12:32
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monkgti

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Location: New Ross

Registered: 31 Jul 2009

Posts: 343

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Post #14
sorry to hijack your thread, but would it be possible to add octane booster to the fuel to use in the S/C conversion? The problem over here is nearly every station bar Maxol just have 95ron, Maxol has the E5 which is 99ron, but the closest Maxol to where i live is a little over 20miles away

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IF YOU CAN READ THIS IM STILL IN 5TH!!!
Posted 7th Mar 2011 at 19:10
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