Acceptable horsepower for jb4-intakes-downpipes?

Serf27 · 08-25-2019, 04:54 AM

Hey everyone, I took my car to dyno and want to know what you all think of the numbers I received with my mods.

Mods are:
Jb4 map 5
2.5” downpipes
Secondary cats in place with PE muffler mod.
BMS DCI filters
1.5 step colder autolite plugs gapped at .22
And e85 mixture. Fuel tank was filled up with 4 gallons of e85 and the rest with 91oct.

On the 4th pull I made 384 whp and 433 Torque.

Being I had some wrong settings on the jb4, I’m sure I would’ve made more if all my settings were correct on the first pull.

An online calculator and the shop owner said that’s about 480hp crank power.

Does that sound about right?

Thanks.

Bimmer_Engineer · 08-25-2019, 10:09 AM

I think 480 at the crank sounds optimistic...

bimmerguy1210 · 08-25-2019, 05:44 PM

Around 450hp and 500ft/lbs at the crank

type-dRew · 08-26-2019, 07:43 AM

Id be happy with those numbers on a stock intercooler car using 91 on a light blend.

mike@x-ph.com · 08-26-2019, 01:00 PM

Without a baseline dyno, the numbers you got are meaningless unfortunately

srey · 08-26-2019, 01:33 PM

The only acceptable horsepower is all the horsepower #sendit

NoGuru · 08-26-2019, 03:07 PM

Manual or Auto?
If you factor 15% for Drive-train you sit at 441 at the crank.

Serf27 · 08-26-2019, 04:59 PM

Thanks all for the replies.
Its an AT n54.

I am happy with the numbers, just curious to see if they were where the car should be at or if something was lacking.

An online formula Said crank power multiplied by .80 for auto is the whp.
So 480 crank hp x .8=384 whp.

I don’t know if it’s a correct or true formula.

But 384.68 Whp and 433.77 Torque is what was actually measured.
This was at about 16-17psi on stock turbos.

Jeff@TopGearSolutions · 08-26-2019, 05:07 PM

Quote:

Originally Posted by Serf27

Thanks all for the replies.
Its an AT n54.

I am happy with the numbers, just curious to see if they were where the car should be at or if something was lacking.

An online formula Said crank power multiplied by .80 for auto is the whp.
So 480 crank hp x .8=384 whp.

I don’t know if it’s a correct or true formula.

But 384.68 Whp and 433.77 Torque is what was actually measured.
This was at about 16-17psi on stock turbos.

20% is quite large. Most find the loss around ~12%.

Dyno's are typically used for the delta, IE the difference between changes. Without a baseline, you just have another number.

08-25-2019, 04:54 AM	#1
Serf27 Brigadier General 2881 Rep 4,333 Posts Drives: 335i Join Date: Apr 2018 Location: Sitting in a BMW. iTrader: (-1)	Acceptable horsepower for jb4-intakes-downpipes? Hey everyone, I took my car to dyno and want to know what you all think of the numbers I received with my mods. Mods are: Jb4 map 5 2.5” downpipes Secondary cats in place with PE muffler mod. BMS DCI filters 1.5 step colder autolite plugs gapped at .22 And e85 mixture. Fuel tank was filled up with 4 gallons of e85 and the rest with 91oct. On the 4th pull I made 384 whp and 433 Torque. Being I had some wrong settings on the jb4, I’m sure I would’ve made more if all my settings were correct on the first pull. An online calculator and the shop owner said that’s about 480hp crank power. Does that sound about right? Thanks. Last edited by Serf27; 08-25-2019 at 05:00 AM..
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08-25-2019, 10:09 AM	#2
Bimmer_Engineer Lieutenant Colonel 1049 Rep 1,667 Posts Drives: 2007 335i Join Date: May 2018 Location: Louisiana iTrader: (0) Garage List 2008 Porsche Boxster [0.00] 2016 Mercedes Benz ... [0.00] 2007 BMW 335i [9.50]	I think 480 at the crank sounds optimistic...
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08-25-2019, 05:44 PM	#3
bimmerguy1210 Enthusiast 92 Rep 269 Posts Drives: E90 335i, E93 335i Join Date: Feb 2019 Location: Los Angeles iTrader: (0)	Around 450hp and 500ft/lbs at the crank
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08-26-2019, 07:43 AM	#4
type-dRew Major 642 Rep 1,245 Posts Drives: 2009 335i xDrive Join Date: Feb 2019 Location: Newport MI iTrader: (0)	Id be happy with those numbers on a stock intercooler car using 91 on a light blend. __________________ 2009 335i xDrive AT / 177k+ miles PSP 750ic / Fuel-It! Stage 1 / BMS CP / Sutphin Tuning / RFP E50 11.61 @ 117.5 New setup; Covid 19Ts on RFP 93 + ARM inlets, dp, VTT cp and PSP outlets
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08-26-2019, 01:00 PM	#5
mike@x-ph.com BimmerPost Supporting Vendor 26947 Rep 195,954 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	Without a baseline dyno, the numbers you got are meaningless unfortunately __________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 702-494-9435
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08-26-2019, 01:33 PM	#6
srey Lieutenant 223 Rep 418 Posts Drives: 2007 E90 335i 6mt Join Date: Jun 2017 Location: Idaho iTrader: (0)	The only acceptable horsepower is all the horsepower #sendit
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08-26-2019, 03:07 PM	#7
NoGuru Major 779 Rep 1,434 Posts Drives: 335is Join Date: Apr 2017 Location: MI iTrader: (0) Garage List 2021 Chevy Silverad ... [0.00] 2014 CTS [0.00] 2011 335is [0.00]	Manual or Auto? If you factor 15% for Drive-train you sit at 441 at the crank. __________________ 2011 335is DCT BQ Tuning / BMS CAI / VRSF kittyless DP's / Synapse BOV and charge pipe / 7" VRSF Race FMIC / Walbro 535 and 450 on BMP4 / E90 tune / Diff Brace / PR Coils / Relocation Inlets / DAW Stage3+ Turbos / MMP port injection / xHP Stage 3 / FPR and -6 fuel lines
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08-26-2019, 04:59 PM	#8
Serf27 Brigadier General 2881 Rep 4,333 Posts Drives: 335i Join Date: Apr 2018 Location: Sitting in a BMW. iTrader: (-1)	Thanks all for the replies. Its an AT n54. I am happy with the numbers, just curious to see if they were where the car should be at or if something was lacking. An online formula Said crank power multiplied by .80 for auto is the whp. So 480 crank hp x .8=384 whp. I don’t know if it’s a correct or true formula. But 384.68 Whp and 433.77 Torque is what was actually measured. This was at about 16-17psi on stock turbos.
	Appreciate 0 Quote