MEGAsquirt A place to collectively sort out this megasquirt gizmo

tips for rev limiter

Thread Tools
 
Search this Thread
 
Old 05-11-2009, 04:07 AM
  #1  
N3v
Junior Member
Thread Starter
 
N3v's Avatar
 
Join Date: May 2008
Location: Nashville/Knoxville, TN
Posts: 314
Total Cats: 1
Default tips for rev limiter

what does every one run for their rev limiter? Mine is set to 9/10 spark cut, soft cut at 7000, 7200 hard cut.

I've played with mine a little before, but it's kinda tough to mess with something that's only activated at maximum rpms. playing around and setting it to 3000 or so, i noticed that 9/10 sparks cut keeps it from exceeding the limit and sounds like a two step rev limiter (not to mention creates fireballs). I noticed that if you allow more sparks than that, you can whizz right by the set limit if you stay floored.

Now, over the past year my car has been megasquirted I haven't given it much thought, but now with the d-rifting season in full spin i find myself hanging around in the 7k rpm range more often. I've noticed that my rev limiter doesn't 'bounce' off the limit like a stock ecu does, it just hangs in the 7k range instead, and while I'm sliding I can't always pay attention to the tach and I don't know if my engine is just revving to the moon or not. I would experiment with it more, but it seems to work, and I also don't want to be jarring my engine too much at it's maximum rpm.
N3v is offline  
Old 05-11-2009, 11:16 AM
  #2  
Elite Member
iTrader: (7)
 
samnavy's Avatar
 
Join Date: Apr 2006
Location: VaBch, VA
Posts: 6,451
Total Cats: 322
Default

For a margin of safety, I set my soft at 6800 and hard at 7000. With the SR20 T25, I was well past my power/torque peaks and it didn't make sense to set it higher. With a larger, more efficient turbo running a little less boost, I'd rev it higher if I was still building hp.

Something a lot of people never do homework on when talking about rev-limiters and the track, is their final-drive ratio. Guys with money can build tranny's with different gearsets based on the track... but it's easier to swap in a new final drive in a Miata (not that those accomplish the same thing). Have you looked into a new r&p to help your buttsexxxing?
samnavy is offline  
Old 05-11-2009, 11:43 AM
  #3  
Elite Member
iTrader: (9)
 
Saml01's Avatar
 
Join Date: Jul 2007
Location: NYC
Posts: 5,710
Total Cats: 3
Default

Originally Posted by samnavy
For a margin of safety, I set my soft at 6800 and hard at 7000. With the SR20 T25, I was well past my power/torque peaks and it didn't make sense to set it higher. With a larger, more efficient turbo running a little less boost, I'd rev it higher if I was still building hp.
Same.
Saml01 is offline  
Old 05-11-2009, 12:55 PM
  #4  
N3v
Junior Member
Thread Starter
 
N3v's Avatar
 
Join Date: May 2008
Location: Nashville/Knoxville, TN
Posts: 314
Total Cats: 1
Default

Originally Posted by samnavy
Something a lot of people never do homework on when talking about rev-limiters and the track, is their final-drive ratio. Guys with money can build tranny's with different gearsets based on the track... but it's easier to swap in a new final drive in a Miata (not that those accomplish the same thing). Have you looked into a new r&p to help your buttsexxxing?
I think you misunderstood me, I'm revving that high on purpose and that's not what bothers me. That's the nature of drifting with an N/A car, you have to drive the **** out of it and keep it in the maximum powerband the whole time. Kinda like doing a moving sideways burnout I'm just worried about my revs continuing over my limit when I'm not paying attention.
Originally Posted by Saml01
Same.
yeah but what do you guys run for spark and cut numbers?
N3v is offline  
Old 05-11-2009, 01:48 PM
  #5  
Elite Member
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,976
Total Cats: 355
Default

Pussies. 7800 for the win.

Jim
Attached Thumbnails tips for rev limiter-keratea_large.png  
Reverant is offline  
Old 05-11-2009, 02:08 PM
  #6  
Former Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 15,442
Total Cats: 2,099
Default

I don't understand soft cut rev limiters. I have my hard cut set at 7200 and the soft cut set at 7300 so it never activates. My car makes peak power over 7k, though.
Savington is offline  
Old 05-11-2009, 02:52 PM
  #7  
N3v
Junior Member
Thread Starter
 
N3v's Avatar
 
Join Date: May 2008
Location: Nashville/Knoxville, TN
Posts: 314
Total Cats: 1
Default

from what I understand it just retards the timing a ton to cut your power so you won't fly right past the hard cut limit.
N3v is offline  
Old 05-11-2009, 03:47 PM
  #8  
Elite Member
iTrader: (1)
 
richyvrlimited's Avatar
 
Join Date: Jun 2006
Location: Warrington/Birmingham
Posts: 2,642
Total Cats: 42
Default

I'm the same as Savington, disabled the soft limit, and then anhillate the hard when I hit it

Never bounced over my hard limit which is set at 7300 either, settings are spark cut only, 3 out of 5 sparks cut.
richyvrlimited is offline  
Old 05-13-2009, 09:19 AM
  #9  
Senior Member
iTrader: (6)
 
tyson87's Avatar
 
Join Date: Aug 2008
Location: West Palm Beach, FL
Posts: 1,020
Total Cats: 1
Default

Originally Posted by Reverant
Pussies. 7800 for the win.

Jim
...is the coolant 101* F?
tyson87 is offline  
Old 05-13-2009, 11:43 AM
  #10  
Elite Member
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,976
Total Cats: 355
Default

101 Celsius = 214F

Jim
Reverant is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
StratoBlue1109
Miata parts for sale/trade
21
09-30-2018 01:09 PM
Quinn
Cars for sale/trade
6
10-23-2016 07:58 AM
ihiryu
General Miata Chat
9
09-28-2015 10:22 AM
tehzack
Dynos and timesheets
10
09-21-2015 06:30 PM
vehicular
General Miata Chat
12
09-14-2015 03:17 PM



Quick Reply: tips for rev limiter



All times are GMT -4. The time now is 02:48 PM.