1.75" is too big for a 998
1.5" is as big as you want to go IMHO
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| tuning SU https://www.ausmini.com/forums/viewtopic.php?f=2&t=13355 |
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| Author: | Fat80y [ Mon Nov 21, 2005 9:23 pm ] |
| Post subject: | tuning SU |
Qick question, If I want to lean my mixture on SU, looking from above with carby on car, I turn the big nut at the bottom of the jet anti-clockwise - yes? |
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| Author: | J_A_M [ Mon Nov 21, 2005 9:30 pm ] |
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lean is anti-clockwise |
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| Author: | Fat80y [ Mon Nov 21, 2005 9:43 pm ] |
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Thanks |
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| Author: | K-Bar [ Tue Nov 22, 2005 2:06 am ] |
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so when its leaner, its more economical??? and clockwise slightly should be a lil richer, and thus more performance?? |
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| Author: | J_A_M [ Tue Nov 22, 2005 7:34 am ] |
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my recent observations from playing with mixtures indicated that a too lean mixture will give you no power down low....to the point where you can hardly take off without riding the clutch a lot. A mixture that is too rich will feel powerfull, but possibly foul your plugs, cause excessive fuel comsumption and/or saturate your bores with petrol and cause premature wear. Finding the right mixture is quite important! |
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| Author: | Fat80y [ Tue Nov 22, 2005 12:33 pm ] |
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Reason I ask is, I've put on my 1.75" SU which was tuned on 1275, on my 998. 50k's on the hwy the other day chewed half a tank, so I'll lean it out a bit I think.... |
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| Author: | awdmoke [ Tue Nov 22, 2005 12:35 pm ] |
| Post subject: | |
| 1.75" is too big for a 998
1.5" is as big as you want to go IMHO |
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| Author: | J_A_M [ Tue Nov 22, 2005 2:11 pm ] |
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AND the needle will definitley need changing!!! |
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| Author: | K-Bar [ Tue Nov 22, 2005 2:18 pm ] |
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ive got 1.5 SU and 998 engine. free flow air. extractors. what needle would do nicely for me?? i think the winSU told me to use a AAA. but is that something i can just go to mini craft and get. or do ausies use different codes? cheers |
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| Author: | Fat80y [ Tue Nov 22, 2005 6:31 pm ] |
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Yes I know 1.75 is too big, but I wanted to fit extractors to free the exhaust up a bit, and this carb was already bolted up nicely to an alloy manifold and has been rebuilt. No idea what needle it has, my mech tuned it with a file!!! Which is why I'm just going to experiment a bit with main mixture. Not worried about low speed torque (which is what theoretically suffers - not that I've noticed) as you have to rev its tits off to go anywhere anyway.... |
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| Author: | Volodkovich [ Tue Nov 22, 2005 8:39 pm ] |
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K-Bar, i would be looking at an ABD needle for the 998 like yours. Mine is similar - exhaust, LCB, alloy inlet manifold and K&N and i have made up an ABD needle for it (which i had to slightly tweek to richen it in certain points). ABD is a good starting point though |
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