Test on different exhaust !
06-27-2009, 06:21 PM
#21
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Originally Posted by S2SEXY,Jun 27 2009, 08:21 PM
what i dont understand is the 3in>70mm but 60>3in
06-27-2009, 07:15 PM
#22
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Originally Posted by EternalLx,Jun 27 2009, 06:17 PM
Interesting!
I am running a supercharger
I recently switched from asm 70mm single to amuse 70mm->50mm split dual
I noticed a midrange gain with my butt dyno... I thought it was just my imagination till I saw this thread!
I am running a supercharger
I recently switched from asm 70mm single to amuse 70mm->50mm split dual
I noticed a midrange gain with my butt dyno... I thought it was just my imagination till I saw this thread!
You will gain more tq !!
06-27-2009, 08:45 PM
#23
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Originally Posted by SFV_S2k,Jun 27 2009, 05:28 PM
3inch>70mm>63mm was my initial theory !
But nope its more like 60mm>3inch>70mm .
But nope its more like 60mm>3inch>70mm .
06-27-2009, 09:49 PM
#25
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you didn't log boost, and i think that's the missing piece of this puzzle. target AFR's would have been nice to see, too. i can only guess you're running the 12psi pulley? also, what management are you on?
i would have loved to see the boost curves. i understand they are always linear with centrifugal setups but things can get tricky up top towards redline (slipping belts will slip more depending on how humid/hot/cold/blah blah that day...)
i'm not saying that your exhaust experiments are altogether wrong but i think we're missing some data here.
i would have loved to see the boost curves. i understand they are always linear with centrifugal setups but things can get tricky up top towards redline (slipping belts will slip more depending on how humid/hot/cold/blah blah that day...)
i'm not saying that your exhaust experiments are altogether wrong but i think we're missing some data here.
06-28-2009, 12:10 AM
#26
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Originally Posted by TelosHedge,Jun 27 2009, 09:49 PM
you didn't log boost, and i think that's the missing piece of this puzzle. target AFR's would have been nice to see, too. i can only guess you're running the 12psi pulley? also, what management are you on?
i would have loved to see the boost curves. i understand they are always linear with centrifugal setups but things can get tricky up top towards redline (slipping belts will slip more depending on how humid/hot/cold/blah blah that day...)
i'm not saying that your exhaust experiments are altogether wrong but i think we're missing some data here.
i would have loved to see the boost curves. i understand they are always linear with centrifugal setups but things can get tricky up top towards redline (slipping belts will slip more depending on how humid/hot/cold/blah blah that day...)
i'm not saying that your exhaust experiments are altogether wrong but i think we're missing some data here.
Im using the SOS 3inch pulley.
AEM EMS as engine management.
boost was the same of 14.6 psi on all runs (graphs on bottom of page)
Belt not slipping at all is achieved by 3M fabric glue spray (green bottle)!!!
Red is from my last setup ( not used)
Green is from FX70RR
Red is 3 inch
Green is 63mm
06-28-2009, 05:22 AM
#27
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ahhh well done 
now you've thrown me another curveball - i've never heard of anybody using 3M adhesive to prevent slippage. where do you apply it, and how long does it last before it needs to be re-applied?
all this being said, are you going to stay with your tanabe exhaust, or are you now going to experiment with various 63mm setups? also, what test pipe/cat setup did you run with the tanabe?
keep the info flowing - my supercharger is in the mail and i'd loved to be well educated before it gets here.
now you've thrown me another curveball - i've never heard of anybody using 3M adhesive to prevent slippage. where do you apply it, and how long does it last before it needs to be re-applied?
all this being said, are you going to stay with your tanabe exhaust, or are you now going to experiment with various 63mm setups? also, what test pipe/cat setup did you run with the tanabe?
keep the info flowing - my supercharger is in the mail and i'd loved to be well educated before it gets here.
06-28-2009, 07:57 AM
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spearco front mount + Comptech aftercooler
Sideways tips on improving the cooling
Sideways tips on improving the cooling
06-28-2009, 09:32 AM
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I recall talking to Mase about this a few years back, when I was planning my FI setup.
I think it has to do with exhaust velocity, not flow. The exhaust gases are exiting the smaller diameter exhausts at a MUCh faster rate than with a larger exhaust setup. The increase in exhaust velocity leads to a greater "scavenging effect" at the exhaust ports, effectively pulling the exhaust out faster.
I know this also affects turbo applications, but not to the same degree as teh scavenging effect is negated by the placement of the turbo between the exhaust ports and the downpipe. Mase's kit uses a 63mm downpipe, I think... If that is fed into a larger cat-back system, the added flow of the larger exhaust will increase exhaust velocity from the turbo (it will be flowing the same as the larger piping, so velocity must be increased). It does not make the turbo spool any faster, but will prevent it from "bottle necking" at the downpipe.
This is how I understand it...
John
I think it has to do with exhaust velocity, not flow. The exhaust gases are exiting the smaller diameter exhausts at a MUCh faster rate than with a larger exhaust setup. The increase in exhaust velocity leads to a greater "scavenging effect" at the exhaust ports, effectively pulling the exhaust out faster.
I know this also affects turbo applications, but not to the same degree as teh scavenging effect is negated by the placement of the turbo between the exhaust ports and the downpipe. Mase's kit uses a 63mm downpipe, I think... If that is fed into a larger cat-back system, the added flow of the larger exhaust will increase exhaust velocity from the turbo (it will be flowing the same as the larger piping, so velocity must be increased). It does not make the turbo spool any faster, but will prevent it from "bottle necking" at the downpipe.
This is how I understand it...
John