4000 RPMs = magic?
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4000 RPMs = magic?
Maybe it's just me, but my engine seems to have a huge power step at 4000 RPMs. It's like I have VTEC or some crap. what up with that shiznit? 4000 doesn't seem to be around any of the power/torque/boost peaks. so what's up with the sudden surge at 4K? am I the only one with this?
IggDawg is cool.
-IggDawg
1994 Barcelona Red SVX LSi.
1990 CRX Si (for sale)
I know a little about Subarus.
-IggDawg
1994 Barcelona Red SVX LSi.
1990 CRX Si (for sale)
I know a little about Subarus.
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- quasi-mod-o
- Posts: 6000
- Joined: Thu Dec 05, 2002 7:06 pm
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Not sure where a turbo's torque peak is, but us N/A guys have ours at 4400rpm. So at 4000rpm for me, my car will leave some "torquey" domestics behind...
Plus, a turbo's power delivery isn't linear like a supercharger. Igg, I would say your turbo is delivering the most efficient boost at 4000 or above, remember what WRX owners whine about all the time, that their cars are dogs under 3000rpm...
Plus, a turbo's power delivery isn't linear like a supercharger. Igg, I would say your turbo is delivering the most efficient boost at 4000 or above, remember what WRX owners whine about all the time, that their cars are dogs under 3000rpm...
2000 Subaru Legacy B4 RSK
"Der Wahnsinn ist nur eine schmale Brücke/die Ufer sind Vernunft und Trieb"
*Formerly DerFahrer*
@entirelyturbo on social media, including Facebook, Instagram, Twitter, and TikTok
"Der Wahnsinn ist nur eine schmale Brücke/die Ufer sind Vernunft und Trieb"
*Formerly DerFahrer*
@entirelyturbo on social media, including Facebook, Instagram, Twitter, and TikTok
yeah, it's somewhere in the 3800-4200 range. definitely in 1st gear. I think in others as well. even at part throttle it seems to have a little more pep if the revs creep up to that point.
I thought it was a resonant "sweet spot" in the intake or something. like that's when all the engine's "acoustic" charecteristics fit togehter just right. but even after I intercooled it, that magic spot was still there. The intercooler certainly changed the dynamics of where the engien got the most pull. still that magic 4000-ish mark remained.
I thought it was a resonant "sweet spot" in the intake or something. like that's when all the engine's "acoustic" charecteristics fit togehter just right. but even after I intercooled it, that magic spot was still there. The intercooler certainly changed the dynamics of where the engien got the most pull. still that magic 4000-ish mark remained.
IggDawg is cool.
-IggDawg
1994 Barcelona Red SVX LSi.
1990 CRX Si (for sale)
I know a little about Subarus.
-IggDawg
1994 Barcelona Red SVX LSi.
1990 CRX Si (for sale)
I know a little about Subarus.
Even the n/a subies have that sweet spot.
It's most likely how the cam profile/timing is setup that makes it act that way.
It's most likely how the cam profile/timing is setup that makes it act that way.
Josh
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
auto
Josh
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
On the EA-81 in my '85 Subaru Brat it has that same sweet spot at 4000 rpm. It's kinda funny when I realized that that is the same thing I experienced. It feels like a turbo hitting... with the force of a bumble bee, but hitting none the less (70+ horse).
In my EJ22T, I have to say the sweet spot starts around 3000 rpm when cruising. If in a race, yeah the higher the revs the better, but mine will start to really pull at 3000 for nice effortless acceleration.
In my EJ22T, I have to say the sweet spot starts around 3000 rpm when cruising. If in a race, yeah the higher the revs the better, but mine will start to really pull at 3000 for nice effortless acceleration.
1993 WMP BC6 5MT EJ22T 9psi 3.9:1 213k 205/55R16
62.6 m/s @ 0.66 bar. Gotta love boost. :)
62.6 m/s @ 0.66 bar. Gotta love boost. :)
I HEAR THAT
I know for a fact mine gets a pure boost of power cause i was racin this one guy and he had me until i got my boost and after that i had just enough to beat him it was sweet......Thats subaru for you always something good comes from under the hood even if it would appear as if nothing was there.....I know for a fact there is!!
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91 Subaru Legacy [L]
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Had a broken tranny got that fixed and now the crankshaft's seems bent :(
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91 Subaru Legacy [L]
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Had a broken tranny got that fixed and now the crankshaft's seems bent :(
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