|
|
|
|
|
| 06-03-2012, 05:11 PM | #1 |
|
Lieutenant
 
37
Rep 435
Posts |
Surge in Power at 2500 RPM
When accelerating, as soon as the car hits roughly 2500rpm, I get a surge in acceleration. The engine takes on a higher pitch and revs build faster. Kind of like the old VTEC Honda engines. Is this normal?
|
| 06-03-2012, 05:31 PM | #2 |
|
Brigadier General
 
504
Rep 3,446
Posts |
It sounds good to me! I drive a 135i, and have never really wrung out a 128i or 328i.
__________________
See my photography at http://ronscubadiver.wordpress.com
|
|
Appreciate
0
|
| 06-03-2012, 07:00 PM | #3 |
|
!
693
Rep 3,266
Posts
Drives: 2010 128i
Join Date: Feb 2010
Location: Anacortes, WA
|
I don't have any experience with Hondas, but yeah, power delivery is very linear on these cars and really seems to increase exponentially as the revs climb. I don't know if I've noticed a particular point in the RPM range where it feels like the power "turns on," but around 2500-3000 the engine is definitely waking up. As you start to hit 4000, 5000, 6000 it is just screaming and pulling hard, I love it.
__________________
____________________________ |
|
Appreciate
0
|
| 06-03-2012, 07:17 PM | #4 | |
|
Macaroni
4
Rep 111
Posts |
Quote:
You realize this is the definition of something being NONlinear right?
__________________
--Josh--
2011 CTS-V Manual, 542rwhp 2015 Lexus GX460 1965 Mustang Fastback |
|
|
Appreciate
0
|
| 06-03-2012, 07:18 PM | #5 | |
|
Heisenberg
51
Rep 569
Posts |
Quote:
__________________
 AR Catless Downpipes | Berk Full Street Exhaust | HPF FMIC | COBB AP | aFe Magnum Stage 2 | E93 M3 Front Sway Bar & Bushings | Michelin Pilot Super Sports | Hardwired Radar | Eurotek BBS LM | Schmiedmann LCI Blacklines | BMW Performance: Spoiler, Diffuser, Shift Boot, E-Brake |
|
|
Appreciate
0
|
| 06-03-2012, 07:28 PM | #6 | |
|
!
693
Rep 3,266
Posts
Drives: 2010 128i
Join Date: Feb 2010
Location: Anacortes, WA
|
Quote:
I guess I wasn't describing it correctly. I just meant that it builds quickly, once it gets going. And that it doesn't drop off at the end.
__________________
____________________________ |
|
|
Appreciate
0
|
| 06-03-2012, 07:56 PM | #7 |
|
Macaroni
4
Rep 111
Posts |
What you are experiencing is Double-VANOS steplessly variable valve timing, which is basically a variant of VTEC/MIVEC/VVT-iE/etc. It's the reason for what you are describing.
__________________
--Josh--
2011 CTS-V Manual, 542rwhp 2015 Lexus GX460 1965 Mustang Fastback |
|
Appreciate
0
|
| 06-03-2012, 08:21 PM | #8 | |
|
Lieutenant
37
Rep 435
Posts |
Quote:
|
|
|
Appreciate
0
|
| 06-03-2012, 08:30 PM | #9 |
|
Macaroni
4
Rep 111
Posts |
__________________
--Josh--
2011 CTS-V Manual, 542rwhp 2015 Lexus GX460 1965 Mustang Fastback |
|
Appreciate
0
|
| 06-04-2012, 12:04 AM | #10 |
|
Vrooom :)
313
Rep 2,602
Posts |
do you have an auto? my pedal feels dead until I push it in, also reason why I always drive in manual mode, car feels much more alive. The auto's have bad lag, which can be fixed with a BMS powerbox and such.
and, as others said above, the double vanos and also the 128i gets full torque around there.
__________________
2014 C7 Corvette Stringray - Laguna Blue - NPP Exhaust - Competition Seats
|
|
Appreciate
0
|
| 06-04-2012, 12:58 PM | #11 |
|
General
2038
Rep 25,989
Posts |
I thought what you were feeling was turbo-lag before I realized you have a 128. BMW's have a stronger power band higher up in the revs. German cars are like that for some reason, I have the same feeling in my old Benz. Japanese cars normally feel like they have consistent power throughout the revs and it doesn't dramatically increase (not considering v-tec or vvt-i etc. etc.)
__________________
VMR|Wheels | 714.442.7916 |
sales@velocitymotoring.com | www.velocitymotoring.com | facebook | flickr | Instagram |
|
Appreciate
0
|
Post Reply |
| Bookmarks |
|
|
