yah i was thinking E3 until you said supercharged
go to the dyno, hand over the green
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| Needle and jet?? https://www.ausmini.com/forums/viewtopic.php?f=5&t=26357 |
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| Author: | minimechanic [ Tue Jan 02, 2007 11:05 pm ] |
| Post subject: | Needle and jet?? |
Hey guys i have a 998 with High lift cam Ported and oversize valves.. Extractors Knn filter sc12 supercharger kit Just wondering what needle and jet would i try for using on the hif44??? |
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| Author: | slinkey inc [ Wed Jan 03, 2007 7:39 pm ] |
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We can't tell you! You'll need some dyno time. If this is the Ben Afford kit, on the sheet he gives you with it the last thing on the 'how to' says 'go to dyno' or something like that. I spoke with him in person about this, and he said that dyno time is pretty well a must. |
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| Author: | Spaceboy [ Wed Jan 03, 2007 10:26 pm ] |
| Post subject: | |
yah i was thinking E3 until you said supercharged go to the dyno, hand over the green
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| Author: | 92 [ Sat Jan 06, 2007 7:54 pm ] |
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Can't give a definate needle size but I have measured a needle from a relativly standard SC 1275 may give an idea as what size for a start. It is a custom needle so numbers on it don't mean anything and best way is to look up in a needle book and find something close. The needle is about 44mm long. measurements are in thousands of an inch and measured about 2mm apart down the needle. 1- .091 2- .089 3- .088 4- .087 5- .085 6- .083 7- .079 8- .077 9- .073 10- .068 11- .062 12- .057 13- .054 14- .051 15- .049 16- .047 17- .045 18- .043 19- .040 20- .038 21- .035 22- .034 |
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| Author: | d1_davey [ Sun Jan 07, 2007 4:03 pm ] |
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hey dude can you pm me the details of the super charger please? might be doing this the neddles i have now are h6 ones atm |
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| Author: | slinkey inc [ Sun Jan 07, 2007 9:51 pm ] |
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Davey...where abouts are you located in Adelaide? |
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| Author: | d1_davey [ Wed Jan 10, 2007 1:23 pm ] |
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PM sent mate 
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| Author: | minimechanic [ Thu Jan 11, 2007 5:33 pm ] |
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mmm i was just hoping to see what some people are running with their kit just to get a rough idea so it will run ok until it gets dyno'd.. no worries anyway... and yes i will be running bens kit... |
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| Author: | Al Munday [ Fri Jan 12, 2007 10:07 pm ] |
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minimechanic wrote: mmm i was just hoping to see what some people are running with their kit just to get a rough idea so it will run ok until it gets dyno'd..
no worries anyway... and yes i will be running bens kit... Try a metro turbo needle...... gotta be "roughly" close to get you running ...... as a starting point only...... then you can get it to your dyno guy ! |
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| Author: | 92 [ Mon Jan 22, 2007 7:12 pm ] |
| Post subject: | |
After Googling SU needle Chart found some needles that may be OK to Start with DB needle goes from 090" -036" CS1 Needle goes from 090"-048" CS2 090"-044" BB4 090"-046 The last 3 are leaner so probably better for 998-1100" |
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| Author: | gr4h4m [ Tue Mar 03, 2009 7:47 am ] |
| Post subject: | |
Interestingly I have been looking into needles recently. I have my car setup at a rolling road and at WOT its great showing an AFR in the low 12's/high 11's using a tech edge wideband via a pipe sniffer. I have measured my needle using the SU station ID which is about every 3mm I'm running a 998 SC12 12G295 and 1.5 rockers 8.7:1 The three figures are from left to right SU station No / measurement in mm and then measurement in inches. My car does suffer from a lean out (17-19 AFR)when going from cruising to WOT and can stall when coming off of WOT to a stop. I think the needle needs work at idle and the cruse stations. I have been looking for a close needle to mod myself and then check the results with my techedge wideband pipe sniffer. Looks like a BCG needle is close so should only need a bit of fiddling. 1 2.47 0.097 2 2.47 0.097 3 2.37 0.093 4 2.31 0.090 5 2.23 0.087 6 2.04 0.080 7 1.89 0.074 8 1.69 0.066 9 1.51 0.059 10 1.34 0.053 11 1.20 0.047 12 1.12 0.044 13 1.06 0.042 14 1.00 0.039 15 1.02 0.040 16 1.02 0.040 I have plotted bens needle above my current one and the bcg as you can see Bens is richer all of the way through up to WOT. Anyone else running an SC12 kit got any data we can all share? 
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| Author: | slinkey inc [ Tue Mar 03, 2009 9:47 am ] |
| Post subject: | |
I found a heavier spring helped the lean out issue. Otherwise I usually don' t go from crusing to wide open, give it a little bit then **** open seems to work better. Mine used to stall but after it was tuned and it stopped. I did fit a butterfly with a spring loaded valve in it from a Range Rover. It's part of the Rangie emmission system but according to my tuner lets the revs come down slower as it opens on deceleration. But I'm not sure if this is the reason it doesn't stall. |
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| Author: | MINI66 [ Tue Mar 03, 2009 2:32 pm ] |
| Post subject: | su needle |
I use a BCJ i think - I will have to double check. But it is on a Hif6 1275 (1100s engine) standard grind cam, 12g940 head - 8.3 pistons - Holley blue fuel pump & 7psi sc12 (home made kit)- Tech edge wideband kit. I haven't had enough time lately to tune but have given it one run up the road since tech edge install and i am reading stoich at high revs , rich at low revs and idle. BCJ seems a crap load leaner than your BCG? Hope this helps |
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| Author: | DarkenMini [ Tue Mar 03, 2009 4:06 pm ] |
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this is good reading so far. do you think most dyno tuning mechanics Should be able to get a good needle tune from a SC12 1100 even tho most deal with EFI car tuning? .edit. do u think it would be a good idea to Try a weber setup and hif44 setup and tune each and then decide what is better suited to ur driving? would a Weber setup be a bit easyer for the mechanic to tune in? |
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| Author: | gr4h4m [ Wed Mar 04, 2009 6:51 am ] |
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mm yes I have been looking at the old SU and tuning. IMO they are a bot over complicated for what they achive, by this I mean there is a lot of factors that effect the way they meter the AFR, Damper rates, spring rates, needle thickness, bi metallic strip...; not to forget they are all 20 years old and suffer a bit. I think a good starting point is 1) Start with the best carb possible i.e no dodgy air flow mods to the body... 2) Give it a full rebuild so all of the parts possible are changed. 3) inspect the dash pot plunger for wear including the piston and dashpot body. I got a new Old Stock so I had a new float and bimetallic strip etc. There is a useful mod on Turbo minis to replace the bi-metallic strip and make one out of standard steel one. To stop the mixture changing with the heat... (Something I will do for the next time the carb is off) Its interesting to see that my car was setup on the other side of the world and the needle profiles are close to Bens 1275 data. I presume there is an effect of the charger that keeps the profile similar. I used the following to measure my needle then searched an on-line data bases for needles that were close and that's how I found the BCG. www.theiansons.co.uk/mini/suneedlestations.doc Which looks a good starter if not a bit rich top end. I will hopefully give it a try this weekend with my tech edge kit. But it might be a good starter however you cant add the material at the bottom end if its too rich, but it does match the profile type. I have found a guide that shows needle polishing http://www.turbominis.co.uk/forums/inde ... 59683&fr=0 but it seems a long process of removing very small amounts and the trying the car in different driving conditions. I used this quick spreadsheet to look at the needles to see the differences in profile. you can changed the coloured squares with new data. www.theiansons.co.uk/mini/needlecomp.xls |
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