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Skinners Sprint Micra
- Thread starter Skinner_87
- Start date
OP
OP
i,m just "picking it up as i go" too matei,ve just changed the camera frame-rate to 30fps (from 15) and i,ll try later
Cheers Bud, im just working my way through this seems pritty good: http://www.gill.co.uk/products/digital_ignition/introduction/9_ign_advance.asp
OP
OP
aye, plainly put eh paul
you will be able to apply more engine load than me tho (from your live data) my engine load is gonna be quite small while revving it in neutral (which is compounded by the light flywheel too eh)
The more straight forward the better!
Il find the steepest hill i can to run it up, a hard pull through the rev's in third should be enough?
OP
OP
Im going to take a gamble & see if i have this straight!
As i increase RPM the ecu will advance the ignition as the engine is spinning more quickly.
However when an engine is under load this advance needs to be decreased depending on the size of the force against the motor.
My problem is as i have no "load" going into the ECU so the ignition will be far too advanced when going uphill / WOT
What i need to do is record the RPM / Advance under different loads & compare them to a regular map to see how far out from "ideal" i am.
then i might be able to come to a compromise at WOT (what i need when racing) to get the most for the time being
As i increase RPM the ecu will advance the ignition as the engine is spinning more quickly.
However when an engine is under load this advance needs to be decreased depending on the size of the force against the motor.
My problem is as i have no "load" going into the ECU so the ignition will be far too advanced when going uphill / WOT
What i need to do is record the RPM / Advance under different loads & compare them to a regular map to see how far out from "ideal" i am.
then i might be able to come to a compromise at WOT (what i need when racing) to get the most for the time being
frank
Club Member
thats what the dyno guy,s tend to do when roadtesting eh paul
the rpm advance is most beneficial for mpg and emissions it seems, and is a hindrance in the quest for maximum power (ie, you need far less rpm advance at high load/WOT)
which flies in the face of opinions that "gains are low when you are running WOT all the time" ^
frank
Club Member
aye, a bob-weight and vacuum operated dizzy is crude 3D i guess andyI'll be interested in your results. See they'll compare to mine
Wont a 2D map be ok providing you can set the map knowing your load values. Or is something that has be varied under load? In terms of WOT use.
And vac can deal with the low load/rpm advance?
frank
Club Member
for boosting yes, for n/a, i doubt it
h701micra
Deactivated Account
That's ok then
n/a it'll stay as is. Its boost timing I'm more concerned about
Apologies for the partial hijack but there's a nugget of info for you skinner
frank
Club Member
here,s a vid of the car jacked up 1 side and running in 3rd gear paul (to simulate some load) you can see it holds roughly base timing when loaded (20 deg paint line) but the line drifts to the left when slowly revved (45ish deg of advance)
and this one with the T/P/S disconnected, where its fully advanced under load eh
and this one with the T/P/S disconnected, where its fully advanced under load eh
OP
OP
here,s a vid of the car jacked up 1 side and running in 3rd gear paul (to simulate some load) you can see it holds roughly base timing when loaded (20 deg paint line) but the line drifts to the left when slowly revved (45ish deg of advance )
and this one with the T/P/S disconnected, where its fully advanced under load eh
That's spot on Frank so with no load feed from the TPS it goes to fully advanced straight away, mine will be doing the same ( will test it though)
Is there much I can do to get the advance to about 20 under load to get a bit more bhp? Or is that only doable with nistune?
frank
Club Member
yes, fit your t/p/s mate
OP
OP
yes, fit your t/p/s mate
Doh it's been a long day! Cheers bud il have a look at where I can mount it in line
h701micra
Deactivated Account
The obvious is the hardest to spot
OP
OP
The obvious is the hardest to spot
I wouldn't mind but I've not even had a pint!
Frank FTW eh!
OP
OP
Well the TPS is ready to be mounted up, brackets made just waiting on some metal adhesive to join the peg I'm using to turn the TPS to the carbs.
Once it's in and working il get the datascan plugged in to see what's what. Hopefully emulating Franks readings under load ie less advance under loaded WOT
Once it's in and working il get the datascan plugged in to see what's what. Hopefully emulating Franks readings under load ie less advance under loaded WOT
OP
OP
Little bit of progress made, TPS sensor cam (or whatever you want to call it) is attached & turns spot on with the butterfly spindle
Next up to mount the sensor (ditched the first bracket too flimsy) will need to be adjustable to its reads WOT at the right point. Might compromise the idle as it will read that the throttles a little more open than it is (shouldnt have thought this would cause any problems)
P.S its not stuck on with sticky tape that just to keep the excess epoxy out
Next up to mount the sensor (ditched the first bracket too flimsy) will need to be adjustable to its reads WOT at the right point. Might compromise the idle as it will read that the throttles a little more open than it is (shouldnt have thought this would cause any problems)
P.S its not stuck on with sticky tape that just to keep the excess epoxy out
OP
OP
Carbs are now sporting a TPS does anyone know the voltage reading the TPS reads at WOT so I now it's set right?
does anyone know the voltage reading the TPS reads at WOT so I now it's set right?
SirChris
Educated Bodger
You clever beanCarbs are now sporting a TPS
OP
OP
Unpicked the wiring tonight (again grrr) routed the TPS loom to where it needs to be
Plan for the weekend, get the laptop out and reset the timing to 15deg at 650rpm, then plug the TPS in and give it it's first test run
Plan for the weekend, get the laptop out and reset the timing to 15deg at 650rpm, then plug the TPS in and give it it's first test run
Update?
OP
OP
Idles reset to 15deg at 650rpm (drops to 600 with the TPS unplugged)
TPS reading at just over 4 kilo ohms at WOT which I think Haynes is telling is about right
Driving its pulling smooth but I won't be able to stretch it until some closed road event,
Luckily that's this coming Saturday more drag racing!
OP
OP
Ta Frank I could do with a longer USB cable as the laptop is sat in the foot well at the minute il have a little tweek of the TPS
Hopefully get lower than my current 15.6!
OP
OP
I haven't mate tbh, if they are anything like kart transponders (imagine they would be) they yet are only small, 1" x 3".
All my events are run by bean timing so it's just beam splitters up front for me
h701micra
Deactivated Account
If it helps ours is cabled tied behind the grill
I haven't mate tbh, if they are anything like kart transponders (imagine they would be) they yet are only small, 1" x 3".
All my events are run by bean timing so it's just beam splitters up front for me
Sorry mate I think that's what I meant... The black rod things, timing struts i thinks the other name is?
I was caught out for mine being too high, so I'll just make a new one, No worries
Enuo
Glorified Electrician
Timing plates?Sorry mate I think that's what I meant... The black rod things, timing struts i thinks the other name is?
I was caught out for mine being too high, so I'll just make a new one, No worries
Thats the one, sorted it all out now anyway
Just took a bit of thinking for some reason. Simple now I think about it
OP
OP
Sorry mate I think that's what I meant... The black rod things, timing struts i thinks the other name is?
I was caught out for mine being too high, so I'll just make a new one, No worries
That's them mate timing strut/ beam splitter, that's a pain u got caught up on it
Think the minimum height is 18cm but no higher than 20cm, made mine 19 to be on the safe side.
OP
OP
You'll need to get one made up for April eh fellaIf it helps ours is cabled tied behind the grill
h701micra
Deactivated Account
That's a good point.You'll need to get one made up for April eh fella
We got any regs yet
OP
OP
Since I never got around to tidying the wheels up since they went on thought it best to get stuck in with the drag and drift coming up.
Tar and break dust must have been on a good while, white spirit and 4 hours of scrubbing!
Few coats of polish on each will hopefully make washing them in future the future dam easier
Tar and break dust must have been on a good while, white spirit and 4 hours of scrubbing!
Few coats of polish on each will hopefully make washing them in future the future dam easier
OP
OP
OP
OP
That's a good point.
We got any regs yet
No reg's unfortunately fella
il send the link over as soon as they are though!
h701micra
Deactivated Account
No worries still looking forward to going for a playNo reg's unfortunately fella
OP
OP
Did you have a skeet at the vids of the event?
OP
OP
Yeh I was just sleeting through the other night, carnt waitI did mate. You stuck some vids up didn't you? It looks like a decent event
I've got loads if u car if you want to have a look I can email them over or what have you
h701micra
Deactivated Account
Yea I can do mate sounds like a good idea to meYeh I was just sleeting through the other night, carnt wait
I've got loads if u car if you want to have a look I can email them over or what have you
OP
OP
Just two little bolts mate, it's only attached to the car 3 days a year lol
Haha fair enough, cheers
OP
OP
Well done one your first rally too mate!!
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