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Hif 38 Needle


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#1 mister bridger

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Posted 02 March 2009 - 02:54 PM

Took my mk1 for its first long trip to Goodwood yesterday and was pleased to make it there and back! Only problem seems to be cruising at speed on dual carriageway etc - doesn't pull cleanly, feels like it's struggling for fuel. Checked the plugs after and they were very white so could it be that I need a richer needle? Current one is marked "ADP". It's an unleaded 998cc A+ engine, with K&N cone filter and RC40 exhaust. My other thought was that the inline fuel filter might be restricting flow? Timing was checked and set to 8deg and all the rest of the electrics are standard and new.

#2 lrostoke

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Posted 02 March 2009 - 03:40 PM

That needle is pretty much a standard needle for a standard setup car.

Have you also got an LCB or Freeflow manifold ?? and a seperate inlet manifold if so then you are running way to weak.
You want either a

AAA or AAM

#3 mister bridger

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Posted 02 March 2009 - 03:49 PM

That needle is pretty much a standard needle for a standard setup car.

Have you also got an LCB or Freeflow manifold ?? and a seperate inlet manifold if so then you are running way to weak.
You want either a

AAA or AAM

Yes I have what i think is a lcb manifold and seperate inlet manifold. Which of the two needles would you recommend?

#4 lrostoke

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Posted 02 March 2009 - 04:23 PM

Try the AAM

#5 Spitz

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Posted 02 March 2009 - 04:40 PM

That needle is pretty much a standard needle for a standard setup car.

Have you also got an LCB or Freeflow manifold ?? and a seperate inlet manifold if so then you are running way to weak.
You want either a

AAA or AAM


I have a similar set-up...but with SW5 and 1098 crank

I tried an AAM, but found it too rich. I then tried an AAU, it works perfectly. At the low end it's close (a little richer) to your ADP, but at the higher end of revs ( ie: carriageway ) it is richer by a good margin.

#6 mister bridger

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Posted 02 March 2009 - 04:46 PM

I've ordered an AAU from Southern Carburettors - I'll let you all know the verdict. Many thanx

#7 lrostoke

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Posted 02 March 2009 - 05:26 PM

It can vary from car to car.

My sister is running a 998 stage 1 with a AAU needle and its fine. I tried the AAU in my 998 stage 1 and had a massive flatspot, so I'm running AAA and it flys now.
The AAM is very similar to the AAA.

In order of richness from midrange its AAU , AAA, then AAM




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