Piggybacks & higher rev limiter

AltecBX · 05-15-2010, 09:49 AM

If piggybacks have full control of fuel and the fuel limit cutoff is 7000rpm, why can't or doesn't a piggyback tune higher the rev limiter from 7000rpm?

Funkmob · 05-15-2010, 10:02 AM

The complete valvetrain assembly is designed for that rpm limit. You would need to change alot of parts to benefit from a higher rpm level.

JoshM813 · 05-15-2010, 10:14 AM

Plus it'd be a waste of time to do it as the N54 loses it's legs after 6500rpms.

Maybe good for upgraded turbos though or when running nitrous. IDK

AltecBX · 05-15-2010, 10:16 AM

What about for methanol users spraying up-top?

O-cha · 05-15-2010, 10:16 AM

It's a lot more then that, they aren't equipped to do it. They would have to be actively controlling throttle ignition and fuel, not just offsetting it and only reading it.

They would actually have to build their own maps from scratch, oh noez.

themyst · 05-15-2010, 10:28 AM

only benefit to removing or increasing the rev limiter for 6MTs is to prevent throttle closure if your shifts aren't "perfect".

shochu75 · 05-15-2010, 04:02 PM

Ya dude, on the wrx it was possible to raise the rev limiter after adding camshafts, titanium valve springs, retainers, rockers, and all that crap. 335i gearing is tall enough, it's all engineered to work with the rev limit we have now. I'm not sure there are even parts for the 335i for that.

05-15-2010, 09:49 AM	#1
AltecBX Colonel 324 Rep 2,663 Posts Drives: BMW 335xi Sedan; BMW M3 ZCP Join Date: Nov 2007 Location: NYC iTrader: (0) Garage List 2018 BMW M3 ZCP [0.00] 2007 BMW 335Xi [0.00]	Piggybacks & higher rev limiter If piggybacks have full control of fuel and the fuel limit cutoff is 7000rpm, why can't or doesn't a piggyback tune higher the rev limiter from 7000rpm? __________________ 335xi Sedan 6AT \| Weather(70-85°F) \| N54 Tune Comparison Chart \|\| N54 Turbo Upgrade Comparison Chart -PROcede Rev. 2.5 ~ v5 (3/17 maps) / JB4 (8/21 maps) / COBB (Stg2+FMIC LT Aggressive maps) †Procede Map2(UT 45 - IGN 40) Aggression Target 2.0 \| 0-60 in 4.0sec \|\| †Cobb E30 LT (35% Ethanol/65% 93 Octane) \| 0-60 in 3.9sec AR Design Catless DP \| BMS DCI + OCC \| ETS 5 FMIC \| Alpina B3 Trans Flash \|235/265 19" Michelin PSS
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05-15-2010, 10:02 AM	#2
Funkmob First Lieutenant 20 Rep 306 Posts Drives: 335i E92 space grey Join Date: Oct 2009 Location: Belgium iTrader: (0)	The complete valvetrain assembly is designed for that rpm limit. You would need to change alot of parts to benefit from a higher rpm level. __________________ 335I AT 2007. Vishnu V5 / UR CAI / HPF Intercooler / ER Charge pipe / Synapse BOV / Macht Shnell dp's / Vanguard catless exhaust / BSH occ / Labonte S4 Meth injection / Quiafe LSD / Full M3 suspension parts / Bilstein PSS10 / EBC brakes and lines / RB turbo's
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05-15-2010, 10:14 AM	#3
JoshM813 First Lieutenant 9 Rep 363 Posts Drives: E55 AMG Join Date: Jan 2010 Location: Tampa, FL iTrader: (1)	Plus it'd be a waste of time to do it as the N54 loses it's legs after 6500rpms. Maybe good for upgraded turbos though or when running nitrous. IDK __________________ Current: 2005 Mercedes E55 AMG My Mods: Eurocharged Tune, 180mm Pulley, Heat Exchanger and H/E pump Previous: 2007 BMW 335i
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05-15-2010, 10:16 AM	#4
AltecBX Colonel 324 Rep 2,663 Posts Drives: BMW 335xi Sedan; BMW M3 ZCP Join Date: Nov 2007 Location: NYC iTrader: (0) Garage List 2018 BMW M3 ZCP [0.00] 2007 BMW 335Xi [0.00]	What about for methanol users spraying up-top? __________________ 335xi Sedan 6AT \| Weather(70-85°F) \| N54 Tune Comparison Chart \|\| N54 Turbo Upgrade Comparison Chart -PROcede Rev. 2.5 ~ v5 (3/17 maps) / JB4 (8/21 maps) / COBB (Stg2+FMIC LT Aggressive maps) †Procede Map2(UT 45 - IGN 40) Aggression Target 2.0 \| 0-60 in 4.0sec \|\| †Cobb E30 LT (35% Ethanol/65% 93 Octane) \| 0-60 in 3.9sec AR Design Catless DP \| BMS DCI + OCC \| ETS 5 FMIC \| Alpina B3 Trans Flash \|235/265 19" Michelin PSS
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05-15-2010, 10:16 AM	#5
O-cha Brigadier General 218 Rep 4,726 Posts Drives: Mcoupe Join Date: Oct 2007 Location: In front of you iTrader: (2)	It's a lot more then that, they aren't equipped to do it. They would have to be actively controlling throttle ignition and fuel, not just offsetting it and only reading it. They would actually have to build their own maps from scratch, oh noez. __________________ Last edited by O-cha; 05-15-2010 at 04:43 PM..
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05-15-2010, 10:28 AM	#6
themyst Major General 177 Rep 6,631 Posts Drives: '16 MK7 GTI Join Date: Feb 2009 Location: NYC iTrader: (8)	only benefit to removing or increasing the rev limiter for 6MTs is to prevent throttle closure if your shifts aren't "perfect". __________________ E90 LCI N54 6AT
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05-15-2010, 04:02 PM	#7
shochu75 Private First Class 5 Rep 126 Posts Drives: e90 Join Date: Apr 2009 Location: honolulu iTrader: (0)	Ya dude, on the wrx it was possible to raise the rev limiter after adding camshafts, titanium valve springs, retainers, rockers, and all that crap. 335i gearing is tall enough, it's all engineered to work with the rev limit we have now. I'm not sure there are even parts for the 335i for that.
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