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Turbo Mini Forums

so a bit of investigation occurred , looks like the turbo is coming on line around 1900 rpm , but not very dynamically ,







reaching 5 psi at 5 ish ..





you would think that the valve would bang it into action a little more fruitily than that ,so i tested the actuator ...


https://youtu.be/Z89MkuL-Z2s





ah ..that'll be the problem then..new saab actuator and bleed for tomorrow i think .




robert.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

oh i forgot joost , it was good and stable , they are pretty slippery .

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

these exhaust gas control valves are solenoid controlled, that could be why it creeps with the slightest pressure

Yes i moved to the darkside

Instagram @jdm_brett

robert, if you can be arsed, could you do a datalog with the spool valve jammed full open and jammed hard shut? would be an interesting datum for further logs and tuning of the valve.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

i did a run with the 7 psi actuator on the valve , also fattened up the fueling a touch too much ..

then plotted a comparison with the earlier 2 psi actuator run ,showing fueling ..







safe to say the actuator made a big difference .

top end 12 psi rush in 4th is pretty impressively warptastic .

mid range 2 to 3 psi area feels very baggy after a goodish trq.boost reaction , i think its possible i am driving this turbo into surge .

i am going to do some research into similar size turbo 67mm maps and my air demands .

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Had a bit of a play swapping numbers into a excel spreadsheet to compare the different modes ..





the 2psi line is a little bumpy due to a gear change spooling up the holset before the run in the logged gear ,but you get the idea .

robert.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

well...... after a bit of time off for good behaviour , i'm back on project work, and i had a bit of a think whilst off killing foreign spies .

what could cause the engine to feel

1) a bit baggy and soft in response ,

2) run much too hot ,

3)but feel fine at low rpm and on cruise , and on higher boost ???



obvious thing to check i came up with was IGNITION TIMING !


now it was supposed to be 24 d fixed ,with 16 d vacuum .

hoicked out my strobe and guess what i found ...


yurp , fixed at 8 d btdc.

spindle had seized on the rotor body .

so i have the dizzy out ,free'ed it off ,i am going to run a slightly different strategy ,since i now have a box to retard timing on boost .

found a couple of springs to give the curve i want , with 15d static ,and 34 total , all in by 2500 to go with the cam design , and 16 vac with a different cannister since that was n/a too.

the weights in the dizzy were 13d so 26d at crank , so i have to bring that down to 9.5 by welding 2mm blob of weld in the advance weight .


quite excited to try it now , hould be a touch more like it , be really interesting to see if the boost comes in any faster .i can think of arguments for it working both ways.


robert.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Sounds good Robert, I'm messing with a 205 turbo technics at the moment, it uses a capsule on the dizzy that can both vac advance and boost retard.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

www.twin-turbo.co.uk

Interested to see how you get on, i found tuning had very little effect on boost threshold, but then my ignition was never locked at 8deg solid lol it seemed to be purely a function of the engines ability to pump air. Playing with cam timing and the like had a better effect.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

That comment of wil,s about the default 10 degree setting on the Edis confirms an intermittent problem I have had.

Occasionally the rev counter refuses to woek and the car feels a bit sluggish. If it swings into action, as it does eventually, the car picks up and goes normally. I am now sure that when the rev counter is off I am on 10 degrees fixed.

Must be a wiring issue somewhere ? Or a faulty RC ?

maybe power feed/earth to the mjlt david ?

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Will look at that Robert -thank you

Had exactly your problem David,and in my case was a poor connection on the MJ power supply. Finished up driving all the way home from Shakey in limp mode

'Where does the engine go?'

well!

after sorting the dizzy , i connected up the boost timing master and nada ,zip , occasional flashes but not working . so re connected the msd 7 , and set timing to 26max ,10 static .then drove 80 miles .

huge improvement in power and response , not much boost though .but really nice to drive in the cold night air on the 40 miles back to base , i forgot how well these things go round corners .

downside was a fair bi of exhaust fumes in car , so i decided to take off the new pipes and re weld a few blown pinhole areas , did that , and re engineered the three bolt flange that was leaking .and also changed the plugs .

looking at the old plugs ...






these should all be the same colour , milk chocolate ,so i think a plenum redesign is in order ... now that i have a straight shot into the plenum , it is obviously biasing to the passenger side of the car .

which if you look at the flow path , would figure .,,,





a bit of time on the flow bench and some baffling this afternoon i think.



looking at the log , i think i had much less boost than expected because with the new timing now from 8 d to 26 on boost , its running way lean .





also ,after the new plugs i decided to connect the btm up again , and after a bit of mal triggering it started up !! so i imagine buying a new msd box ,then not using it for about 6 years , may allow a switch or something in there to get a bit stickiy , heres hoping its ok now . i can now bang my timing up another 8 degrees , whoop!

regards
robert.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

plewnhambb fun..


https://youtu.be/IIml91NYn-k

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

That is very impressive Robert.

(Both the experiment and the increase in airflow)

thanks david ,

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

time for a new turbo...

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Quad turbo?

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

The one on the bottom/ left loos like it would fit perfect

The one next to it replacing the Holset?

that's the one i just took off !

On 24th Apr, 2016 Sprocket said:
The one on the bottom/ left loos like it would fit perfect

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

ok ,after a good read through of hx40's used by v8's ,an executive decision has been made .

i am going with the 6 blade 60mm wheel hx40 ,and the 16 cm turbine housing ,WITH the spool valve left in .

i have a new wheel being posted from usa to vancouver bc then to me here in uk ,so when that gets here i can wack it all together and see what super low down boost that barstard makes .if its too low i can disable the spool valve .


traction problems here i come.


i tested them all on the flowbench and here is the inky winky little IHI RHB6 49mm ind turbo i used to run as the 2nd stage in GREEN ,compared to the hx40 16cm port closed in BLUE..




should be a spoolin monster .


so while i waited for the cave floor to dry i got flangey wiv it.



firstly i ported out the turbine inlet..












then got some old manky flame cut 1/2 " plate ..






made the adaptor plate from turbo to 4"downpipe.




and the huge holset hc3 flange to the t3 flange adaptor cut out .





then sanded and spiffed up the housing .







regards
robert

Edited by robert on 26th Apr, 2016.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM