so im calculating hp gains...
#1
Goofyrotor
Thread Starter
so im calculating hp gains...
and according to "dyno proven" results, hitting 200hp, atleast to the flywheel, of of NA s4 isnt "that" hard.
i was making myself a parts list as i do frequently and got so bored i thought i would add up all the HP gains websites say we get when we buy their product.
heres how i figured it out:
stock:146FWhp so like what ~130 to wheels ish...
apexi says +17hp for N1, i dont buy it, so lets say ~+5
bonez intake COLD air: ~+6
pulley kit: +10
header and highflow cat: ~+10
and finally a streetport: ~+20%
=thats around 192 now i dont know if the manufacturers get their rating from flywheel or wheel HP but still. not too shabby
anyone have anything to add? or am i totally wrong?
i was making myself a parts list as i do frequently and got so bored i thought i would add up all the HP gains websites say we get when we buy their product.
heres how i figured it out:
stock:146FWhp so like what ~130 to wheels ish...
apexi says +17hp for N1, i dont buy it, so lets say ~+5
bonez intake COLD air: ~+6
pulley kit: +10
header and highflow cat: ~+10
and finally a streetport: ~+20%
=thats around 192 now i dont know if the manufacturers get their rating from flywheel or wheel HP but still. not too shabby
anyone have anything to add? or am i totally wrong?
#3
Jesus is the Messiah
Originally Posted by jonesfromindia
and according to "dyno proven" results, hitting 200hp, atleast to the flywheel, of of NA s4 isnt "that" hard.
i was making myself a parts list as i do frequently and got so bored i thought i would add up all the HP gains websites say we get when we buy their product.
heres how i figured it out:
stock:146FWhp so like what ~130 to wheels ish...
apexi says +17hp for N1, i dont buy it, so lets say ~+5
bonez intake COLD air: ~+6
pulley kit: +10
header and highflow cat: ~+10
and finally a streetport: ~+20%
=thats around 192 now i dont know if the manufacturers get their rating from flywheel or wheel HP but still. not too shabby
anyone have anything to add? or am i totally wrong?
i was making myself a parts list as i do frequently and got so bored i thought i would add up all the HP gains websites say we get when we buy their product.
heres how i figured it out:
stock:146FWhp so like what ~130 to wheels ish...
apexi says +17hp for N1, i dont buy it, so lets say ~+5
bonez intake COLD air: ~+6
pulley kit: +10
header and highflow cat: ~+10
and finally a streetport: ~+20%
=thats around 192 now i dont know if the manufacturers get their rating from flywheel or wheel HP but still. not too shabby
anyone have anything to add? or am i totally wrong?
But you are correct : it is possible to hit 200HP at the flywheel in an N/A for not too much, keeping it pretty streetable.
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That's similar to the math I came up with before I joined this forum.
I figured:
Stock RWHP: 135ish
Headers/cat replacement: +10hp
Catback: +10 hp
Intake: +5 hp
SAFC: +10 hp
Streetport: +20%
RESULT: 204 RWHP....and about 235 to the flywheel...but according to the dyno results posted here is isn't quite so easy as that.
I figured:
Stock RWHP: 135ish
Headers/cat replacement: +10hp
Catback: +10 hp
Intake: +5 hp
SAFC: +10 hp
Streetport: +20%
RESULT: 204 RWHP....and about 235 to the flywheel...but according to the dyno results posted here is isn't quite so easy as that.
#7
Goofyrotor
Thread Starter
trust me if i had the money and time to turbo my NA. i would do it in a heartbeat. but i dont even have a job, yet. by today i should. sucks being a student.
shane racing they actually put it on their rx7 test car. so thats why i believe the 10hp from the pulley kit. but doubt it. just for numbers. and 17 hp from just a catback. no way.
NA FTW...till i can get turbo FTW
shane racing they actually put it on their rx7 test car. so thats why i believe the 10hp from the pulley kit. but doubt it. just for numbers. and 17 hp from just a catback. no way.
NA FTW...till i can get turbo FTW
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#12
Former Moderator. RIP Icemark.
Don't forget that power train losses also go up.
For example, the typically FC has around a 20% power train loss. So if you increase your HP to 200 at the flywheel, you will be down 40 HP at the wheels.
But with the stock 146 HP, you will be only down around 30 HP at the wheels.
For example, the typically FC has around a 20% power train loss. So if you increase your HP to 200 at the flywheel, you will be down 40 HP at the wheels.
But with the stock 146 HP, you will be only down around 30 HP at the wheels.
#13
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Originally Posted by Karack
i don't even tell my turbo customers +20% for a streetport, what makes you guys think an n/a gives you an added 20% horsepower?
"What does your "Mild Street porting" do for performance, drivability, and horsepower?
It gives you approximately 20% more horsepower without any significant problems in drivability."
http://www.atkinsrotary.com/index.php?pag=8
--Alex
#16
Goofyrotor
Thread Starter
Originally Posted by Icemark
Don't forget that power train losses also go up.
For example, the typically FC has around a 20% power train loss. So if you increase your HP to 200 at the flywheel, you will be down 40 HP at the wheels.
But with the stock 146 HP, you will be only down around 30 HP at the wheels.
For example, the typically FC has around a 20% power train loss. So if you increase your HP to 200 at the flywheel, you will be down 40 HP at the wheels.
But with the stock 146 HP, you will be only down around 30 HP at the wheels.
i think 30 thats kinda steep. sti's lose 50hp going to 4 wheels according to a subaru tech. so 30 hp to the rears might be a little too much unless its been proven on the dyno. i would think 20. but i could be wrong you are a lot smarter. lol
#17
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Originally Posted by Black91n/a
You can't just add up HP claims, it doesn't work like that, there's diminishing returns the more you do to it.
Also, wouldn't an NA see a larger % of gains from porting than a turbo car? I don't know if I'm right, but it seems like the larger ports would be more advantageous with an NA since it doesn't have a compressor slamming air into the engine.
Edit: I think the standard is 15-20% drivetrain losses for our cars, so 30 seems maybe a tad high for stock, but still pretty much in the ballpark. BTW, STi's have 300 FWHP, so 50 hp loss is right in the 15-20% range.
#18
Eats, Sleeps, Dreams Rotary
Originally Posted by Black91n/a
You can't just add up HP claims, it doesn't work like that, there's diminishing returns the more you do to it.
HP claims mean nothing until you have it on a dyno... I wouldn't even bother trying to calculate my car's HP since realistically it's probably no more than 5 RWHP more than stock (...feels plenty fast in when it's in a good mood though...even in 5th gear, at a reasonable 5th gear speed)... and that's ignoring the fact that cone intakes without head shield usually lose power.
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Originally Posted by jonesfromindia
i think 30 thats kinda steep. sti's lose 50hp going to 4 wheels according to a subaru tech. so 30 hp to the rears might be a little too much unless its been proven on the dyno. i would think 20. but i could be wrong you are a lot smarter. lol
Originally Posted by Sideways7
Edit: I think the standard is 15-20% drivetrain losses for our cars, so 30 seems maybe a tad high for stock, but still pretty much in the ballpark. BTW, STi's have 300 FWHP, so 50 hp loss is right in the 15-20% range.
Subarus, and most AWD cars, typically have about 25% drivetrain loss for the manuals and closer to 30% for the automatics.
A stock 300hp Sti typically puts down about 230 awhp.
#20
Former Moderator. RIP Icemark.
Originally Posted by jonesfromindia
i think 30 thats kinda steep. sti's lose 50hp going to 4 wheels according to a subaru tech. so 30 hp to the rears might be a little too much unless its been proven on the dyno. i would think 20. but i could be wrong you are a lot smarter. lol
With a stock 146 HP when new that would put it a little past 20%
On the S4 Turbo (180 hp new) typically has rear wheel dyno runs of around 140-145 HP again, putting it right in line for a 20% drive line loss.
#21
Goofyrotor
Thread Starter
Originally Posted by Icemark
Well the typical dyno run for a stock S4 non turbo is around 110-115 at the rear wheels
With a stock 146 HP when new that would put it a little past 20%
On the S4 Turbo (180 hp new) typically has rear wheel dyno runs of around 140-145 HP again, putting it right in line for a 20% drive line loss.
With a stock 146 HP when new that would put it a little past 20%
On the S4 Turbo (180 hp new) typically has rear wheel dyno runs of around 140-145 HP again, putting it right in line for a 20% drive line loss.
#24
Lives on the Forum
You also have to remember that if they even put the car on the dyno to "prove" the gains, they'll take the very best after run and compare it to the very worst before run to get a better number. There's been claims of 30hp from an exhaust on a Honda, in the very fine print they mentionned that it was a ~400hp turbo car, so not a realistic picture of what it'll do for a regular car.
#25
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Originally Posted by Karack
and who sais Atkins has done before and after testing of their ports for exact gains/losses? in my view they just guessed like everyone else does and figured 20% sounded good.