Dyno comparison

shattered_z

New Member
May 18, 2024
6
0
0
Jusr finished a dyno day at a local garage, and I feel disappointed.

412hp/457tq on DynoJet

Feel like it should have more.


95k miles 2008 N54

JB4/MHD custom tune
93 octane pump gas
Dual Air Intake
High Pressure Side Oil Catch Can
Aluminum charge pipe
Tial BOV
VRSF 7.5" IC
VRSF Catless Downpipes
VRSF Street Exhaust
2x 25 row oil coolers
B58 Coil Pack conversion
220°F Oil Thermostat
Rb2+ Hybrid Turbo Kit (upgraded inlets and PCV)
Fuel-It Stage 2.5 low pressure fuel pump
SPEC Stage 3 clutch
SPEC 14lb flywheel
IRP v2 Short Shifter

Datazap: https://datazap.me/u/n54blacke90/log-1716069953?log=0&data=1-4
 

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carabuser

Lieutenant
Oct 2, 2019
921
1
848
0
UK
Ride
Z4 35i & 335i
Hard to read jb4 graphs but it just looks like you have low boost and timing. Power is about right considering.
 

ktb_e92

Lurker
Apr 16, 2024
13
17
0
Indiana
Ride
2007 335i MT6
Don't be disappointed, those numbers seem pretty realistic given the mods, fuel, and psi. There are significant amounts of people out there with, say a big single turbo setup, on a ~19psi 93oct tune that are barely tapping as much as 500whp, considering the top-end power is usually a bit better on those compared to upgraded twins. Who is you tuner? Your datalog looks pretty good, though the shop could've used some better fans because your IAT's seemed a tad high compared to when I dyno'd mine on a fairly warm morning and I have the same intercooler as you. I didn't see anything mentioned about upgraded turbo outlets though, did you re-use the stock ones? Also, an RB2+ is a 17t-sized turbo, so you'd need something like a Game Finisher/19t-size if you're wanting to move even more air through the compressors to generate higher power on a non-port injection tune like a 19psi/93oct one. Regardless you do have a good turbo setup, all of RB's products seem great. Remember, you can still run a ~22psi E40 map which will give you anywhere between 500-550whp, and still be safe on the HPFP without port injection!
 

shattered_z

New Member
May 18, 2024
6
0
0
Thanks for the replies.
Doc Vu tuned.
VRSF Outlets installed (part of RB kit)

It was like 104°F inside shop. Fan was small.
Waiting for N4 motorsports to release their DI delete before I put more $ into this car.

Doing DI delete, and going to run e85.
 
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RTA

Specialist
Jun 17, 2020
50
20
0
I agree that your HW supports quite a bit more boost.
Small fan is also not great.
These turbo's and your fuel setup would allow for something in the 21/22+ psi with not too much effort.
 

RTA

Specialist
Jun 17, 2020
50
20
0
From your HW list, I cannot conclude why you have the JB4, but your config as listed can be perfect tuned with a flash.
 
Feb 14, 2024
19
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If DOC is tuning your car. Is he still using MHD? Those mods def should be at the 500whp range. I had pure 600 and made close to 500 pretty easily. They are about in the same realm.
 

carabuser

Lieutenant
Oct 2, 2019
921
1
848
0
UK
Ride
Z4 35i & 335i
For the direct reference boost control and tighter safety specs.
There's no safety advantage to JB4 and the boost control is inferior to flash only.

You should try just running flash only, you'd be surprised how much better it is.
 
Feb 14, 2024
19
0
0
Your already using MHD so why piggy back the jb4? I think you should get rid of it and do as the other guys are saying. Custom tunes with just MHD. DOC can def get you up in HP.
 

IQraceworks

Corporal
Jul 7, 2020
244
151
0
Missouri
Ride
07' BMW 335i
I would have thought that with RB Two +'s and a good 93 tune, you should be well into the 500hp range. My RB Two's make close to 500hp on 93 at 20psi boost.

For comparison...I'm running all the standard bolt-ons, stock outlets, RB Two's, and with my custom E40 tune from V8Bait that hits 25psi, my car has went 10.90's in the 1/4 mile at 128mph...with a soft 2nd gear launch. From all the weight/hp/ET calculators I can find, the car needs to be making close to 600hp to knock out that Trap Speed. Those RB Two+'s should be making close to 500hp easy on pump gas.
 

IQraceworks

Corporal
Jul 7, 2020
244
151
0
Missouri
Ride
07' BMW 335i
Holy heck 10.90 starting in 2nd? What’s your launch control set at? What clutch are you running?
It's an auto trans. I was brake boosting to around 7psi at launch, any more and it would light the tires up. My 60ft times were around 1.80...that was with plain old 265 size Firehawk Indy 500's on a prepped track. Car would probably go 10.60's with some sticky tires and a hard launch....not bad for bolt-ons, RB 2's, and a good E40 tune. No weight reduction...full interior. Wish V8Bait was still doing tuning....that guy is a wizard at tuning the N54's.
 
Feb 14, 2024
19
0
0
I’m not sure what mine will run. In map 4 I’m making around 710whp. I have drag radials now too but it’s been too hot to take it to the track. On stage 2+ I did 12.98. Stock turbos and all.
 

IQraceworks

Corporal
Jul 7, 2020
244
151
0
Missouri
Ride
07' BMW 335i
I’m not sure what mine will run. In map 4 I’m making around 710whp. I have drag radials now too but it’s been too hot to take it to the track. On stage 2+ I did 12.98. Stock turbos and all.
Yeah...it's a good time going to the track. It takes a lot more skill to run a good 1/4 mile number than it does to knock out a quick 60-130 number. I never have ran a 60-130 yet, kind go curious. I know it will go 0-130 in around 11 seconds :)