Motordyne 5/16 Plenum Spacer: Dyno Before and After
#1
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Went to go dyno the car after installing 5/16 Plenum Spacer (Finally)
Result: Gain of nearly 4hp and pretty much the same torque.
My best run was actually 249.24whp and 232.34tq
However, that run's graph got messed up, so I just posted 2nd best pull.
Torque gain is none/irrelevent because I have gotten more than 232tq even
before the Spacer install.
The Plenum Spacer leaned out my car more. My A/F at idle is 17+
The car feels like it's 'chocking' and 3rd gear doesn't pull as good as it used to.
5th gear pull has improved, and feels more torquey
Would getting HF Cats richen out my A/F?
I want to avoid ECU reflash if possible.
Result: Gain of nearly 4hp and pretty much the same torque.
My best run was actually 249.24whp and 232.34tq
However, that run's graph got messed up, so I just posted 2nd best pull.
Torque gain is none/irrelevent because I have gotten more than 232tq even
before the Spacer install.
The Plenum Spacer leaned out my car more. My A/F at idle is 17+
The car feels like it's 'chocking' and 3rd gear doesn't pull as good as it used to.
5th gear pull has improved, and feels more torquey
Would getting HF Cats richen out my A/F?
I want to avoid ECU reflash if possible.
#2
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hf cats will lean you out more
there's something not right if you didn't feel more grunt - before spacer install it always felt like my car would die around 4500RPM (like i wasn't getting enough air)....now it just pulls like crazy at 4500+.
there's something not right if you didn't feel more grunt - before spacer install it always felt like my car would die around 4500RPM (like i wasn't getting enough air)....now it just pulls like crazy at 4500+.
#3
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Originally Posted by 99atlantic
hf cats will lean you out more
there's something not right if you didn't feel more grunt - before spacer install it always felt like my car would die around 4500RPM (like i wasn't getting enough air)....now it just pulls like crazy at 4500+.
there's something not right if you didn't feel more grunt - before spacer install it always felt like my car would die around 4500RPM (like i wasn't getting enough air)....now it just pulls like crazy at 4500+.
There's no vaccum leak, but when I gas it in 3rd (especially in low RPMs)
the engine feels pretty weird.
#5
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You should have driven the car for at least 80-100km's before you did a dyno run. I personally only felt the real gains of the spacer 80k's after installing it.
+1 on the ecu reset not to mention the TB reset is essential if you disconnected the TB plug like me.
+1 on the ecu reset not to mention the TB reset is essential if you disconnected the TB plug like me.
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#11
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Originally Posted by davidv
Thanks for the dyno. I can see fuel problems at about 4,200 and 5,000 – 5,500 rpm. Its the 5,000 – 5,500 rpm range that concerns me. Will increasing exhaust efficiency decrease air:fuel ratio? I doubt it.
out the spacer..
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I sitll think it's a problem w/ the install possibly
and i would never trust performance nissan after their stunt with spacer (ooooh, we'll just remove the gasket from all our boxes because i'm certain MD just put it in their for fun
)
and i would never trust performance nissan after their stunt with spacer (ooooh, we'll just remove the gasket from all our boxes because i'm certain MD just put it in their for fun
![Roll Eyes (Sarcastic)](https://my350z.com/forum/images/smilies/rolleyes.gif)
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Originally Posted by 99atlantic
I sitll think it's a problem w/ the install possibly
and i would never trust performance nissan after their stunt with spacer (ooooh, we'll just remove the gasket from all our boxes because i'm certain MD just put it in their for fun
)
and i would never trust performance nissan after their stunt with spacer (ooooh, we'll just remove the gasket from all our boxes because i'm certain MD just put it in their for fun
![Roll Eyes (Sarcastic)](https://my350z.com/forum/images/smilies/rolleyes.gif)
I was going to buy the spacer from Performance Nissan and have Street Image install it.
I guess i should not even buy it from Performance Nissan then huh.