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Tuning - next steps - 4.6 supercharged RV8
Posted: Fri Jul 17, 2015 1:37 pm
by SuperV8
I have a 4.6 with standard bottom end 9.5:1 cr, top hat linered block.
Piper V846BP270 cam dur INL280° EXT268°
Procharger supercharger 'hybrid! (after the first one failed!)'
I've been slowly tuning and now runs well.
My latest log can be found here:
What do you think?
Very rich - 9:1 AFR at 6.5psi and 4470rpm, 61% duty cycle and spark at 26degs.
My AFT target was 12.2 at that boost and RPM - does this seem reasonable?
How about the timing - very conservative / ok / or too much?
Any thoughts welcome.
Tom.
Posted: Mon Jul 20, 2015 8:26 am
by SuperV8
For those who haven't got tuner studio here's a screen print of the max boost I logged:
Any comments or recommendations?
Tom.
Posted: Thu Aug 20, 2015 4:45 am
by linzerl
Tom
I have looked at your log..& have lots of questions. I'd really like to see your msq file.
You seem to running lots of warm up correction weill into the 80 degs..and little changes in VE have large pulse width changes.
I have a S/C Griffith 500 running MS3. Happy to hrlp further if needed
Posted: Thu Aug 20, 2015 8:37 am
by SuperV8
Hi,
Thanks for you comments,
I have saved my MSQ here:
Can you view it? If not I can email it to you?
Tom.
Posted: Thu Aug 20, 2015 10:28 pm
by linzerl
Tom
Suggestions are:
In all tables when coolant temp in used, create even entries across the entire engine temp range..I.e. -15 to 105
Smooth your VE table. Autotune has made it look very spikey
WUE needs to be more linear
Tuning with 2 squirts is a lot easy than 4..
You do seem to have very big injectors for a 4.6. 440s would cause lots of flow. .2 squirts would help.
Hope that helps
Posted: Fri Aug 21, 2015 8:57 am
by Coops
Funny enough just changing the 440cc injectors in my supercharged 4.6 to 412cc inuectors
Posted: Fri Aug 21, 2015 10:02 am
by stevieturbo
9.6 is mega mega rich, dont keep running it like that.
440's are not big by any stretch of the imagination, especially considering you are seeing 90% IDC ( although yes this is also insanely rich at the same time )
Get it tuned properly, running excessively rich can hurt the rings, and whilst it says 9.1, I'm presuming that is pegged at that, so could well be richer.
And yes, 12.2 at those low pressures shouldnt be a problem at all.
Timing, dont see any issues with such low boost, so dont see it as needing any more or less for now.
Also a cam with either same as intake or more exhaust duration would do no harm.
Posted: Fri Aug 21, 2015 11:24 am
by SuperV8
Thanks for the comments all, i'll have a play and report back.
Cheers,
Toms.
