|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Today's Posts | Search |
|
BMW 3-Series (E90 E92) Forum
>
Shiv, where's the LPFP?
|
|
10-09-2012, 08:18 AM | #23 |
Banned
11
Rep 442
Posts |
Not entirely, burn time of the fuel and many other variables can come into play. But my point is the lmassive low end torque of the RB's would require quite a bit more fuel than Shiv's single. Peak torque at low RPM's is brutal.
|
Appreciate
0
|
10-09-2012, 11:04 AM | #24 | |
Major
68
Rep 1,432
Posts |
Quote:
RBs don't magically produce enough volume to reach 650whp and because the power is 500whp rather than 650whp, they don't need any more fueling than single despite of the worse BSFC. If the RBs would magically produce enough volume for 650whp, they would flow similarly and be similar to the single in all the aspects, BSFC included. Btw. for some reason you talk about RBs all the time. Obsessed? OP has stockers and nobody is talking about RBs here except you They are awesome and worth talking about though, I give you that. This upgrade is useful for being able to use high concentrations of e85 no matter which turbos you run. |
|
Appreciate
0
|
10-09-2012, 11:50 AM | #26 |
Brigadier General
133
Rep 4,764
Posts |
Just a guess from wiki:
Brake Specific Fuel Consumption (BSFC) is a measure of fuel efficiency within a shaft reciprocating engine. It is the rate of fuel consumption divided by the power produced. It may also be thought of as power-specific fuel consumption, for this reason. BSFC allows the fuel efficiency of different reciprocating engines to be directly compared. |
Appreciate
0
|
10-09-2012, 12:32 PM | #27 | |
Banned
11
Rep 442
Posts |
Quote:
I could care less about RB's, I believe OP has Vargas stage II's on order hence why i was referencing RB's for conversation. |
|
Appreciate
0
|
10-09-2012, 12:41 PM | #28 |
Captain
14
Rep 961
Posts |
The sooner you can spool or the lower in the rev range you move peak torque the more fuel volume it's going to need. Just look at where STFT and LTFTs are currently maxxing out on non-flashed cars.
If OP is willing to run the pump why not let him "beta" test it? |
Appreciate
0
|
10-09-2012, 01:04 PM | #29 |
Lieutenant Colonel
65
Rep 1,708
Posts |
Torque means nothing in fuel consumption... HP does. And if there was a need for more low end capacity it would be HPFP related, not LPFP
|
Appreciate
0
|
10-09-2012, 01:05 PM | #30 |
1737
Rep 17,960
Posts
Drives: A Lot
Join Date: Sep 2006
Location: SF Bay, CA
iTrader: (0)
Garage List 2018 Ducati Panigal ... [0.00]
2016 Mazda CX5 [0.00] 2017 Aprilia Tuono ... [0.00] 2019 BMW M2 Competi ... [0.00] 2015 BMW M5 Competi ... [10.00] 2016 Ducati XDiavel S [0.00] 2016 AMG GT S [0.00] 2011 Ferrari 458 It ... [0.00] 2017 Charger Hellcat [0.00] 2015 KTM Super Duke ... [0.00] 2016 KTM RC390 [0.00] |
|
Appreciate
0
|
10-09-2012, 01:16 PM | #31 |
Banned
11
Rep 442
Posts |
|
Appreciate
0
|
10-09-2012, 01:22 PM | #32 |
Major
68
Rep 1,432
Posts |
|
Appreciate
0
|
10-09-2012, 01:24 PM | #33 |
Major
68
Rep 1,432
Posts |
|
Appreciate
0
|
10-09-2012, 01:35 PM | #34 |
Lieutenant Colonel
65
Rep 1,708
Posts |
|
Appreciate
0
|
10-09-2012, 01:59 PM | #35 |
1737
Rep 17,960
Posts
Drives: A Lot
Join Date: Sep 2006
Location: SF Bay, CA
iTrader: (0)
Garage List 2018 Ducati Panigal ... [0.00]
2016 Mazda CX5 [0.00] 2017 Aprilia Tuono ... [0.00] 2019 BMW M2 Competi ... [0.00] 2015 BMW M5 Competi ... [10.00] 2016 Ducati XDiavel S [0.00] 2016 AMG GT S [0.00] 2011 Ferrari 458 It ... [0.00] 2017 Charger Hellcat [0.00] 2015 KTM Super Duke ... [0.00] 2016 KTM RC390 [0.00] |
It's nice to see real tech on a forum.
|
Appreciate
0
|
10-09-2012, 02:05 PM | #36 |
Some dude
91
Rep 1,780
Posts |
That's what I thought, too. The fuel injectors are open longest at peak torque, but the amount of fuel used is max at the HP peak, at least that's what I thought.
__________________
RRT
E92 335i/6MT with stuff and things |
Appreciate
0
|
10-09-2012, 02:22 PM | #37 |
Captain
38
Rep 864
Posts
Drives: '08 E92 335i
Join Date: Apr 2012
Location: Dallas
|
The injectors are open the longest per ignition cycle at peak torque, but the injector duty cycle should follow the HP graph. (Unless my ideas are way off. )
|
Appreciate
0
|
10-09-2012, 02:25 PM | #38 |
Lieutenant
33
Rep 578
Posts |
Keep in mind most tunes will richen the AFR's at higher RPM's.
__________________
2008 135i - MHD/JB4, MS DP's, AMS IC, UI CAI, CDV delete, M3 control arms/Links, RE Toe Link, ECS Trailing Arm, M3 rear SF & Trans bushings, SS brake lines, Michelin PSS.
|
Appreciate
0
|
10-09-2012, 04:36 PM | #39 | |
Some dude
91
Rep 1,780
Posts |
Quote:
At maximum torque output, the injectors are open the longest in relation to the intake stroke, i.e. a longer duty cycle. At maximum power output, the injectors are open for a shorter period during the stroke, i.e. shorter duty cycle, but are open for more strokes during a unit of time. That's why maximum power takes the most fuel, but maximum torque takes the longest amount of injector open time during the intake stroke.
__________________
RRT
E92 335i/6MT with stuff and things |
|
Appreciate
0
|
10-09-2012, 05:56 PM | #40 |
Real Car Enthusiast
288
Rep 2,082
Posts |
Yeah you guys have taken this to a tech level far beyond my comprehension. It has given me a new topic to read though. My sole purpose of the pump is not turbo related. Yes, I have put a deposit on Vargas stage 2 turbos and hope to install them next month. My current quest though is to run 100% e85. Yes, I have a Cobb AP and am running a flash with my jb4 g5 board. My current limitation is the LPFP. AFRs are solid at e60 but FP is tanking. My LPFP quest continues.
|
Appreciate
0
|
10-09-2012, 10:47 PM | #41 | |
Brigadier General
734
Rep 4,635
Posts |
Quote:
__________________
Follow my BMW instagram @CARMODIFICATION Let me know you are from bimmerpost and i'll follow back
|
|
Appreciate
0
|
10-10-2012, 03:57 PM | #43 |
Major
146
Rep 1,201
Posts |
Back to Physics 101 with you! More power requires more fuel.
And I concur, it's nice to see people who know what torque is (and what it isn't).
__________________
'08 E90 w/ just boltons
'09 Z4 sDrive35i w/ just boltons |
Appreciate
0
|
10-11-2012, 09:24 AM | #44 |
Banned
11
Rep 442
Posts |
Well, generalizing, yes thats true. All of the BSFC curves i've seen have been from NA motors, and they are generally U shaped, or shaped like a bathtub really. I havent found an accurate one for a small turbo boosted engine, but im curious what it would look like. Needless to say the guys that posted presented great info, im leaving this one alone.
|
Appreciate
0
|
Bookmarks |
|
|