11.6psi 107% Duty Cycle! - Page 2 - NoPistons -Mazda Rx7 & Rx8 Rotary Forum

2nd Generation Specific 1986-1992 Discussion

11.6psi 107% Duty Cycle!

Reply

 
 
 
Old 06-26-2004, 02:13 PM
  #11  
Senior Member
Thread Starter
 
Join Date: Oct 2001
Location: Peoria, AZ
Posts: 10,906
Default

Originally Posted by RETed' date='Jun 26 2004, 07:45 AM
Haltech E6K extrapolates duty cycle by comparing fuel injector ms versus RPM.

If you have glitches in the RPM, it's possible to have inaccurate duty cycle readings, like those over 100% like that.



Recheck the datalogs, but check the injector MS instead of DC.

Also, check the RPM's, as I bet you had a spike in there.





-Ted
injector m/s was 10.7. No rpm or inj m/s spikes.

I did see like an inj m/s of 12 when I hit 12psi.
1Revvin7 is offline  
Reply With Quote
Old 06-26-2004, 02:28 PM
  #12  
Senior Member
 
Join Date: Nov 2001
Location: Bay Area, CA
Posts: 7,316
Default

Originally Posted by 1Revvin7' date='Jun 25 2004, 06:52 PM
Walrbo fuel pump, 4x 550 cc cleaned injectors



@ 11.6 psi in 4th gear @ 5200rpms I hit 107.8 injector duty cycle.



Using a fuel calculator I guess I have 270rwhp



using a .66 bsfc 15% drivetrain loss



afr was 11.0 then just went lean as all hell and I let off.

intake temps were high, 120-130 a WOT.







So whats up with all the haters thinking you can't hit 300rwhp on the stock turbo? I know its not a dyno graph, but soon I will get one.
Don't trust those calculators to give you HP. I once hit 75% duty cycle with

4 1600 cc injectors. I just plugged that into the calculator and it said 691.6 flywheel HP. That's not even close.
13BAce is offline  
Reply With Quote
Old 06-26-2004, 04:55 PM
  #13  
Senior Member
 
Join Date: Jul 2002
Posts: 2,315
Default

Originally Posted by 13BAce' date='Jun 26 2004, 12:28 PM
Don't trust those calculators to give you HP. I once hit 75% duty cycle with

4 1600 cc injectors. I just plugged that into the calculator and it said 691.6 flywheel HP. That's not even close.
This is true, there are a lot of variables that I don't know for sure, ie: bsfc...
BigTurbo74 is offline  
Reply With Quote
Old 06-26-2004, 08:58 PM
  #14  
Senior Member
 
Join Date: May 2002
Location: California
Posts: 22,466
Default

Originally Posted by 13BAce' date='Jun 26 2004, 10:28 AM
Don't trust those calculators to give you HP. I once hit 75% duty cycle with

4 1600 cc injectors. I just plugged that into the calculator and it said 691.6 flywheel HP. That's not even close.
they use a bsfc that made sense when people thought the stock ecu only did about 63% injector duty, turns out the stock ecu runs over 90, so the bsfc in the calculators is off. instead of .65 its more like [email protected] 10's afr
j9fd3s is offline  
Reply With Quote
Old 06-26-2004, 09:46 PM
  #15  
Senior Member
 
Join Date: Nov 2002
Location: Honolulu, Hawaii USA
Posts: 925
Default

Originally Posted by j9fd3s' date='Jun 26 2004, 06:57 AM
you can set the haltech bars a lot higher in ms than is actually available at that rpm.



ive seen 130% before, oops
Ah, I assumed you knew the limits of fuel injector pulsewidth versus RPM's.



Remember 8.5ms @ 7kRPM!!!





-Ted
RETed is offline  
Reply With Quote
Old 06-26-2004, 11:10 PM
  #16  
Senior Member
 
Join Date: May 2002
Location: California
Posts: 22,466
Default

Originally Posted by RETed' date='Jun 26 2004, 05:46 PM
Ah, I assumed you knew the limits of fuel injector pulsewidth versus RPM's.



Remember 8.5ms @ 7kRPM!!!





-Ted
yeah seths car was 130% before we fingered that out, now why its 130% @6000rpm and 8psi is the real boggle, could it be making 500rw[email protected] 8psi and 6000
j9fd3s is offline  
Reply With Quote
Old 06-26-2004, 11:53 PM
  #17  
Senior Member
Thread Starter
 
Join Date: Oct 2001
Location: Peoria, AZ
Posts: 10,906
Default

So whats the max hp anyone has seen on the stock fuel on the dyno?



My calcutions were off, @ 12psi I see 107% duty cycle....
1Revvin7 is offline  
Reply With Quote
Old 06-27-2004, 12:20 AM
  #18  
Senior Member
 
Join Date: May 2002
Location: California
Posts: 22,466
Default

dunno we'rd dynoing the cosmo t2 soon, 100% stock s5 t2 fuel
j9fd3s is offline  
Reply With Quote
 
 
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Sivart_R1
3rd Generation Specific
2
05-13-2016 03:52 AM
Parag0n
ECU Discussions
2
07-23-2009 03:01 PM
kamikaze_rwj
ECU Discussions
8
09-13-2003 12:55 PM
royston1xxx
3rd Generation Specific
6
08-03-2003 10:51 AM
ZeroBanger
Performance Mods
7
10-21-2002 02:06 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

Thread Tools
Search this Thread
Quick Reply: 11.6psi 107% Duty Cycle!


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.