View Full Version : Dead Mk1.6
Reported on mr2oc.co.uk
http://www.mr2oc.co.uk/ForumsPro/viewtopic/t=77319.html
Ooooh ... sounds like a home conversion though. Wonder if he changed the HG's?
If you're going to race any engine it'll go bang sooner or later won't it?
dont you Guys have to recal the rev counter on these conversions? how much are they out...
edited 'fuys' error!, should have left tit.
I was thinking something similar to be honest Adam. I'm not convinced by mine to be fair. Crusing on the motorway 2krpm higher than normal for that speed... Not right IYAM
Its a 2.6 though isn't it, rather than a 1.6? :P
millentubby
27-09-2007, 15:00
Its a 2.6 though isn't it, rather than a 1.6? :P
yup seems that way - poor 3VZ was so ashamed at being crammed into a probe it committed suicide :(
Atleast the scooby got nailed. Most important thing really:)
robwsurf
27-09-2007, 18:47
with it being 6 cylinders surely you have to change or recalibrate your rpm wont it read wrong otherwise
Looks like he had done a full rebuild on the engine, then gone racing scooby's.
Anyone surprised about the outcome?
He's being quite coy about it on the oc so i think the excitement just got the better of him while running it in.
bottom line is if you want to race scobys then get the rods,pistons etc changed to handle the high RPM or change up earlier.
Also
What the heck are you guys on about with the RPM shit.
Once the clock circuit is changed it is recalibrated. so stop the crap about reading 2000 rmp over - give it a rest!!!!!!!!!!!!!!!!!!!
bottom line is if you want to race scobys then get the rods,pistons etc changed to handle the high RPM or change up earlier.
Also
What the heck are you guys on about with the RPM shit.
Once the clock circuit is changed it is recalibrated. so stop the crap about reading 2000 rmp over - give it a rest!!!!!!!!!!!!!!!!!!!
Garbeage, on the way to Pauls, 80mph was 3400-3500rpm - on the way home it was 5000rpm
Do the maths. If the clock is seeing 6 pulses per revolutuion rather than 4 then it will read one third over .. which is:
5000 * (4/6) = 3333 rpm
Coincidence?
The factory fuel cut on the 3VZ-FE is 7100, yet people are reporting 8500rpm. That surely can't happen? What they're seeing is an indicated 8500 rpm. Maths again ...
8500 * (4/6) = 5666 rpm
Coincidence?
We'll know categorically when the first standalones go on in the next couple of weeks.
bottom line is I have a 850 - 1100 tick over
so if it was out after doing the clock swap i should be getting 3000 rmp on tick over
yep i think my maths is fine"!"
when the engine gets cut out it IS around 7200 rpm so from my personal experience THE CIRCUIT SWAP IS FINE shout shout shout
thats what i mean you tit lol the curcuit swap, perhaps some people dont do this. my tick overs 1400 , warm lol
another thing to consdier at 1000rpm 1/3 is only 300rpms, at 6000, thats 2k out.
a quick way to check, set a stroboscope to 100Hz.. spin up engine until it timing mark on crank is stationery at any position you can see.. check rpm's on clock, it should read 6k. is that right?
perhaps just 3000rpm and 50hz :cadet:
millentubby
27-09-2007, 23:14
3krpm and 100hz would also work ;)
i think what johnny is forgetting to mention is that his clock circuit WAS changed, as was mine, and im *definately* reading different RPM's at identical speeds to my mate's stock mk2 with the same gearbox. The thing is, its not linear.... idle is about the same, but the further up the dial you go, the further apart it gets!
If it's 1/3rd over it won't be linear but proportionate. As Adam said.
Maybe something to do with the different revision Mr2's, Camrys and electric speedo drives.
Nothing to get feisty about lads.
millentubby
27-09-2007, 23:35
If source signal is linear, and corrected signal is directly proportional to the source signal then the corrected signal (reading on Tacho) will also be linear. :)
It's graph time! :mrgreen:
it will be a linear graph , and is proportionate / a ratio lol 4 and 6 does not change amigo
Proportionate or disproportionate?
http://www.twobrutal.co.uk/forum/images/recovered/2007/09/8.gif
did you make that on mspaint? lol
must be alans it revs to 11k :hidesbehi
Photoshop actually. Look am bored god damn it! lol
Why not connect up a multi meter ( set to Hz ) to the tacho signal, assuming that the tacho signal is derived from the firing pulses then on a V6 you should get 3 pulses per engine revolution. So that should give you
50Hz on the meter = 1000rpm
100Hz = 2000rpm
150Hz = 3000rpm
200Hz = 4000rpm
250Hz = 5000rpm
300Hz = 6000rpm
compare the meter reading with the tacho reading to see if it's out
or is that too easy :confused:
lodgeman
28-09-2007, 07:16
must be alans it revs to 11k :hidesbehi
i';ll have you know i had mine professionally converted! :P it does seem slow to respond though!
Paul Woods
28-09-2007, 07:26
the camry tacho board mod does work but it still has an inaccuracy further up the revs,as someone said it gets further out the higher the revs rise,...but remember the number dial is not in exactly the same place on an mr2 as a camry either,so it will always be a little out.
It honestly doesnt bother me at all as long as its a ballpark revs its indicating.
I agree to an extent there Pauline. 100-200rpm is neither here nor there for around town .. but the 1500-2000rpm differential is a bit much?
I guess when we see the engines mapped in the next couple of weeks, we can find out what the tacho vs actual revs are :)
Paul Woods
28-09-2007, 09:08
i think that might just be yours johnny,none of the ones we have done show that much of a discrepancy,500rpm at most by the time 7k comes round..... jinja had his on the dyno and it was very close to the actual reading from what i remember so yours might have a niggle there mate
Wonder if it's anything to do with mine being a turbo before hand? Hmm. Not to worry, a bit of digging when I get it back will uncover ze truth :)
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