on the dyno .68 to .96 ar swap
May 22, 2007 | 09:37 PM
#1
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single digit dreamer
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From: omaha ne
on the dyno .68 to .96 ar swap
in case you dont know this is a mp70 turbo, stock 5.3 with springs, unlocked turbo 400 and a loose converter.
run 5 is with the .68ar and run 7 is with the .96 ar. my turbo guy told me not too expect too much because even with the .96 ar it is still a ptrim wheel and probably too restrictive for a v8. this graph is in mph because it is much easier to read. this is also leting off at only 5800rpm. a few runs later we had it tuned to 6100 rpm and it still pulls prety strong up there. it would have been nice to run the .68ar up higher in the rpms. i bet the diference is even more drastic as the rpms go up.
you can see where it spooled a little slower with the .96. the back presure was down an average of 4psi or so. the boost actualy went down a little. the power was similur in the lower rpms and had a nice gain up top. prety much everything you would expect.
after this set of runs we let it rev higher and dialed in the fuel a little better. then uped the boost a couple more psi
run 5 is with the .68ar and run 7 is with the .96 ar. my turbo guy told me not too expect too much because even with the .96 ar it is still a ptrim wheel and probably too restrictive for a v8. this graph is in mph because it is much easier to read. this is also leting off at only 5800rpm. a few runs later we had it tuned to 6100 rpm and it still pulls prety strong up there. it would have been nice to run the .68ar up higher in the rpms. i bet the diference is even more drastic as the rpms go up.
you can see where it spooled a little slower with the .96. the back presure was down an average of 4psi or so. the boost actualy went down a little. the power was similur in the lower rpms and had a nice gain up top. prety much everything you would expect.
after this set of runs we let it rev higher and dialed in the fuel a little better. then uped the boost a couple more psi
May 22, 2007 | 11:41 PM
#4
Cool, This is good stuff, since I have a VERY similar motor setup in one of my projects. Thanks for the R n D, 
Keep up the good work
Would have been cool to see what kind of difference there was in EGT too, but that's another test, lol
Keep up the good work
Would have been cool to see what kind of difference there was in EGT too, but that's another test, lol
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May 23, 2007 | 08:55 AM
#8
Awesome data! You did a very good job of keep other variables constant and just changing one thing. A true scientific test! 
That should be published somewhere for all the turbo world to see and learn from.
That should be published somewhere for all the turbo world to see and learn from.
May 23, 2007 | 03:57 PM
#9
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single digit dreamer
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From: omaha ne
the car feels very strong.
we tried to keep things consistant. in fact all we did was make a run, shut off the car and swap the housing then make a warm up run and then a for real run. i really wish we had reved it higher with the .68 so we could see more of the graph up top.
as far as spooling time, i am not 100% sure that it was rolled into at the same mph or rate. we kept all runs to one driver so it should be close but you never know. i might be able to look it up on the dataloger.
we tried to keep things consistant. in fact all we did was make a run, shut off the car and swap the housing then make a warm up run and then a for real run. i really wish we had reved it higher with the .68 so we could see more of the graph up top.
as far as spooling time, i am not 100% sure that it was rolled into at the same mph or rate. we kept all runs to one driver so it should be close but you never know. i might be able to look it up on the dataloger.
