more troubles now hesitating and backfiring- added aem graph
Turbo Mini Forums

this is the worst past of fueling i can find on the aem gauge

oh and its not been messing around recently (last 6 days )

do you have a plot that goes from about 2krpm up to red line in second then a long boost in 4th
that one seems to start at 5psi

now this is just a guess because i cant make out much from that graph but it does look like potentially the needle is just too lean on boost and the main fuel is coming from the thick dashpot oil once the needle catches up its causing a lean out


when does the misfire happen? i read from your post its mostly in top gear and on sustained boost runs?

Yes i moved to the darkside

Instagram @jdm_brett

actually where is the boost signal taken from it doest seem to be from the manifold i would expect the boost to vanish completely after a pull and yours seems to linger on

Yes i moved to the darkside

Instagram @jdm_brett

I needto put the rpm wire in to the gauge then I can see ,but its not been messing around at all recently ill get the rpm on there and do propper.one ill try.today, the boost take of is on the plenum just because its always had A take of there

AFR sounds good, If you still have missfire with sustained. Boost, employ the T peice trick to the Carb if you haven't, failing that, I would be looking at the guides nipping. Up momentarily under load if you have manganise guides?

Ive done the the tee piece trick and I have new colisbro guides but is not done it for a while now at all

Ive done the the tee piece trick and I have new colisbro guides but is not done it for a while now at all

I always thought the vacuum/boost take off needed to be after the butterfly? Do you have the megajolt connected to the same one on the plenum?

http://www.turbominis.co.uk/forums/index.p...tid=469104&fr=0

No im running a dizzy but I can put tee piece it it to the dv vacum on the manifold

No im running a dizzy but I can put tee piece it it to the dv vacum on the manifold, but saying that the boost gauge would fill with fuel? Wouldnt it like the dump valves do every Now and then

Edited by charlieb150 on 5th Apr, 2013.

The manifold pressure needs to be taken from the manifold. Ie after the butterfly on the carb.

In the 13's at last!.. Just

Do you think tee piecing it in to the start of the dump valve take of will cause fuel to get to the gauge?

hi all i fitted the boost gauge to the manifold etc here are so better graphs by the looks where im bleeding out the boost its spiking and afrs way outthis is 2nd gear
this is 4th

From what little I know that 2nd gear run doesnt look so bad, but I don't know whats up with the 4th gear run, it doesn't look right and seems leaner

too lean you need to sort the AFR out on higher boost levels, its not been done right on th RR.........

it need sorting pronto or it will end in tears

Yeah I will turn the boost down and get it back on them most proberly vmax scart this time

Yeah I will turn the boost down and get it back on them most proberly vmax scart this time

i think your needle profile is out, yes it is too lean on boost its around 15afr on boost, this is not good, but when you bleed it up to higher boost notice the fueling richens up but in general leans out the longer your on boost

i would be trying again with thiner dashpot oil
( all my profiling of the needle was done with no dashpot oil) and then tweaked up on with oil ( it adds alot of fuel on acceleration and gently leans out as the needle catches up) yours seems to be doing this but the base fueling from the needle is too lean to begin with
if you dont mind spending £7 get your self a BDA needle, this is a very good needle for a slow spooling turbo and high ish boost

Yes i moved to the darkside

Instagram @jdm_brett

take it back to the company and say it was not set right if you approach them nice they should correct it for you

Brett ill order a needle and have a play at the minute its got 20w50 in the dash-pot, ive got 10w40 at work i can try tomorrow and ill re post with a graph :), benross it was done at a friends dads race preparation workshop but they don't really have time for this sort of thing so he said he would get it as close to it as he could with what needles i had he didnt even charge for it, so now i have a afr gauge i can monitor it for going a bit further to vmax as thats the next closest rr thanks charlie