Go Back  Offshoreonly.com > Technical > General Q & A
Timing curve for superchargers >

Timing curve for superchargers

Notices

Timing curve for superchargers

Thread Tools
 
Old 05-18-2017, 10:59 AM
  #1  
Registered
Thread Starter
iTrader: (1)
 
Join Date: Apr 2008
Location: sandown, nh
Posts: 561
Received 4 Likes on 3 Posts
Default Timing curve for superchargers

Got my 588s with the 900sc/10-71 blowers and chiller on them. 9.25-1 with brodix alum heads etc. anyone have a recommendation on how much timing to run. I have the adjustable Daytona ignitions thanks in advance
prostockcat is offline  
Old 05-18-2017, 11:26 AM
  #2  
Registered
iTrader: (7)
 
Join Date: Feb 2009
Location: NW Michigan
Posts: 8,302
Received 1,491 Likes on 806 Posts
Default

Personally I wouldn't go more than 30-32 to start and gradually make changes. Nice you went with the Daytonas. Lots of flexibility. I'd think you'd want a short curve with an initial around 20. PM mild thunder and see what he ended up doing. He's got 420 MB's with Daytona ign also. How much boost you plan on running?
getrdunn is offline  
Old 05-18-2017, 11:28 AM
  #3  
Registered
Thread Starter
iTrader: (1)
 
Join Date: Apr 2008
Location: sandown, nh
Posts: 561
Received 4 Likes on 3 Posts
Default

6-7lbs. The motors before this were 9.5-1 and 38 @ 55-5800 rpm. All same stuff just more Comp and no blowers

Last edited by prostockcat; 05-18-2017 at 11:29 AM. Reason: O
prostockcat is offline  
Old 05-18-2017, 12:02 PM
  #4  
Registered
iTrader: (7)
 
Join Date: Feb 2009
Location: NW Michigan
Posts: 8,302
Received 1,491 Likes on 806 Posts
Default

I'm not familiar with the daytonas as of yet however will be soon. Are you able to set the start/crank timing also? Btw Id initially aim for 6psi with 9.25:1. Maybe a little conservative but better than the alternative.
getrdunn is offline  
Old 05-18-2017, 12:14 PM
  #5  
Registered
iTrader: (7)
 
Join Date: Feb 2009
Location: NW Michigan
Posts: 8,302
Received 1,491 Likes on 806 Posts
Default

Although come to think of it icdpple on here was running same blowers with chillers if I recall at 9:1 static and seems like he was throwing 8 or 9 pds of boost at them. You could do a search on his 548's and see the details to be certin.
getrdunn is offline  
Old 05-18-2017, 12:18 PM
  #6  
Registered
Thread Starter
iTrader: (1)
 
Join Date: Apr 2008
Location: sandown, nh
Posts: 561
Received 4 Likes on 3 Posts
Default

Is that his name on here it's not coming up. It would be good to chat with him on jetting tooo
prostockcat is offline  
Old 05-18-2017, 03:13 PM
  #7  
Registered
 
Join Date: Nov 2005
Location: Fredericksburg, Va
Posts: 4,554
Likes: 0
Received 2 Likes on 2 Posts
Default

I would keep max between 28-30 at first get the tune AFR's right work on timing after
ezstriper is offline  
Old 05-18-2017, 07:23 PM
  #8  
Registered
iTrader: (7)
 
Join Date: Feb 2009
Location: NW Michigan
Posts: 8,302
Received 1,491 Likes on 806 Posts
Default

Here you go. I screwed up on spelling.

http://www.offshoreonly.com/forums/s...ci-motors.html
getrdunn is offline  
Old 05-18-2017, 08:17 PM
  #9  
Registered
 
Join Date: May 2003
Posts: 176
Likes: 0
Received 4 Likes on 4 Posts
Default

Originally Posted by ezstriper
I would keep max between 28-30 at first get the tune AFR's right work on timing after
You are right in the ballpark, 28to 30 degrees with an afr of 11.8 to 12 @ wot.With a 9 to 1 motor your effective comp ratio is 13:1 with 8 lbs of boost. you better be running race fuel.
Boxer is offline  
Old 05-18-2017, 08:56 PM
  #10  
SB
Registered
iTrader: (1)
 
Join Date: Nov 2004
Location: On A Dirt Floor
Posts: 13,546
Received 3,115 Likes on 1,402 Posts
Default

Originally Posted by prostockcat
is that his name on here it's not coming up. It would be good to chat with him on jetting tooo
ICDEDPPL in cap letters
SB is offline  


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.