Notices
Series I Major Horsepower Upgrades This is the place to discuss Super Chargers and Turbos, Nitrous, Porting, etc

Anybody tried running the 380cc P2 injectors in the P1 position ?

Thread Tools
 
Search this Thread
 
Rate Thread
 
Old 12-12-2009, 03:55 PM
  #1  
Boosted Kiwi
Thread Starter
iTrader: (2)
 
Brettus's Avatar
 
Join Date: Apr 2006
Location: Y-cat-o NZ
Posts: 20,584
Received 1,523 Likes on 863 Posts
Anybody tried running the 380cc P2 injectors in the P1 position ?

Just did this .
Scaled them to the same numbers as the P2s but had lots of trouble starting and running rich .
Have since rescaled them up 10% which has improved starting heaps but don't think it is ideal .

Anyone else tried this and had any success ?
Old 12-12-2009, 05:40 PM
  #2  
Banned
iTrader: (3)
 
MazdaManiac's Avatar
 
Join Date: Oct 2003
Location: Under my car
Posts: 16,386
Likes: 0
Received 26 Likes on 22 Posts
I ran (as did quite a few of my AP people) yellows in the primary position.
It works on its own just fine, but it throws off the transition into the secondaries if they are also regular yellows.
The ratio of the P1 to P2 needs to remain the same for the transition to work correctly.

Other than that, you can go quite big in the P1 position if you get the latency right.
Old 12-12-2009, 06:01 PM
  #3  
Boosted Kiwi
Thread Starter
iTrader: (2)
 
Brettus's Avatar
 
Join Date: Apr 2006
Location: Y-cat-o NZ
Posts: 20,584
Received 1,523 Likes on 863 Posts
Originally Posted by MazdaManiac
It works on its own just fine, but it throws off the transition into the secondaries if they are also regular yellows.
The ratio of the P1 to P2 needs to remain the same for the transition to work correctly.
.
Cheers for that .

i'm running
380 P1s
380 Secondaries
480 P2s

So the ratio would be similar between stock P1s(290) and P2s(380)

I put in the same values for latency (for the yellows in P1) as the stock yellow latency map and scaled them to be the same value as well .
Is that what you do as well ?
I couldn't get the engine started (without a push start) with that setup
Old 12-12-2009, 06:09 PM
  #4  
Banned
iTrader: (3)
 
MazdaManiac's Avatar
 
Join Date: Oct 2003
Location: Under my car
Posts: 16,386
Likes: 0
Received 26 Likes on 22 Posts
You need to run 480s in the secondaries if you run 380s in the P1 spot.
Old 12-12-2009, 06:26 PM
  #5  
Boosted Kiwi
Thread Starter
iTrader: (2)
 
Brettus's Avatar
 
Join Date: Apr 2006
Location: Y-cat-o NZ
Posts: 20,584
Received 1,523 Likes on 863 Posts
/\ f**k it . That is what I was going to do to start with and changed my mind at the last min.
Old 12-13-2009, 12:07 AM
  #6  
Boosted Kiwi
Thread Starter
iTrader: (2)
 
Brettus's Avatar
 
Join Date: Apr 2006
Location: Y-cat-o NZ
Posts: 20,584
Received 1,523 Likes on 863 Posts
OK - I've ruled out the injectors as the cause of the hot start issue I'm having now .

Need to look elsewhere ....
Old 12-13-2009, 12:10 AM
  #7  
Pull My Finger
iTrader: (7)
 
gregs's Avatar
 
Join Date: Jul 2007
Location: So.Cal
Posts: 1,784
Received 17 Likes on 8 Posts
i thought you where doing a rebuild? i take its all done and running now?
Old 12-13-2009, 01:24 AM
  #8  
Boosted Kiwi
Thread Starter
iTrader: (2)
 
Brettus's Avatar
 
Join Date: Apr 2006
Location: Y-cat-o NZ
Posts: 20,584
Received 1,523 Likes on 863 Posts
/\ yep . Up and running again . Just tring to resolve hot start issues .....
Old 12-13-2009, 03:24 AM
  #9  
Banned
iTrader: (3)
 
MazdaManiac's Avatar
 
Join Date: Oct 2003
Location: Under my car
Posts: 16,386
Likes: 0
Received 26 Likes on 22 Posts
What are your AFRs immediately after the hot start and before the vehicle goes into CL?
Old 12-13-2009, 07:51 AM
  #10  
Registered
iTrader: (25)
 
TeamRX8's Avatar
 
Join Date: Apr 2005
Posts: 26,862
Likes: 0
Received 2,080 Likes on 1,694 Posts
What ignition coils do you have?
Old 12-13-2009, 10:54 AM
  #11  
Boosted Kiwi
Thread Starter
iTrader: (2)
 
Brettus's Avatar
 
Join Date: Apr 2006
Location: Y-cat-o NZ
Posts: 20,584
Received 1,523 Likes on 863 Posts
Originally Posted by MazdaManiac
What are your AFRs immediately after the hot start and before the vehicle goes into CL?
Pretty sure it's lean but will check .
Old 12-13-2009, 10:55 AM
  #12  
Boosted Kiwi
Thread Starter
iTrader: (2)
 
Brettus's Avatar
 
Join Date: Apr 2006
Location: Y-cat-o NZ
Posts: 20,584
Received 1,523 Likes on 863 Posts
Originally Posted by TeamRX8
What ignition coils do you have?
Stock with about 12000 miles on them .
Old 12-13-2009, 10:26 PM
  #13  
Registered User
 
Talic's Avatar
 
Join Date: Jul 2009
Location: Canada, UAE, Philippines.
Posts: 205
Likes: 0
Received 0 Likes on 0 Posts
Time for some BHRs they really work or i can sell you my hks dli2 for real cheap and will throw in some used coils for free i think i have 5 extras (Shipping will be cheap from the UAE to you. Sorry for thread steal PM me back)

Last edited by Talic; 12-13-2009 at 11:13 PM.
Old 02-18-2010, 03:25 PM
  #14  
Boosted Kiwi
Thread Starter
iTrader: (2)
 
Brettus's Avatar
 
Join Date: Apr 2006
Location: Y-cat-o NZ
Posts: 20,584
Received 1,523 Likes on 863 Posts
here is a log of acceleration from four different rpm points 2000,3000,4000 & 5000

note the rich condition shortly after going WOT . I'm not sure if this is a good thing or not .
Could be the staging issue MM mentioned ....
Attached Thumbnails Anybody tried running the 380cc P2 injectors in the P1 position ?-injector-phase.jpg  

Last edited by Brettus; 02-18-2010 at 03:41 PM.
Old 03-02-2010, 04:04 PM
  #15  
Registered RX8 Nut
iTrader: (11)
 
Highway8's Avatar
 
Join Date: Jul 2007
Location: Fairfield, CA
Posts: 1,366
Likes: 0
Received 7 Likes on 7 Posts
Originally Posted by MazdaManiac
I ran (as did quite a few of my AP people) yellows in the primary position.
It works on its own just fine, but it throws off the transition into the secondaries if they are also regular yellows.
The ratio of the P1 to P2 needs to remain the same for the transition to work correctly.

Other than that, you can go quite big in the P1 position if you get the latency right.

So what do you recommend for all positions, lets say 350HP? I need to purchase some from you, so send me info on how to do that.
Old 03-02-2010, 07:44 PM
  #16  
Banned
iTrader: (3)
 
MazdaManiac's Avatar
 
Join Date: Oct 2003
Location: Under my car
Posts: 16,386
Likes: 0
Received 26 Likes on 22 Posts
Originally Posted by Highway8
So what do you recommend for all positions, lets say 350HP? I need to purchase some from you, so send me info on how to do that.
Stock P1 and S with 700cc or larger P2.
Old 03-02-2010, 07:53 PM
  #17  
Boosted Kiwi
Thread Starter
iTrader: (2)
 
Brettus's Avatar
 
Join Date: Apr 2006
Location: Y-cat-o NZ
Posts: 20,584
Received 1,523 Likes on 863 Posts
as an alternative to that :

280/380/480 works well to about 320whp and tops out at 350whp
380/480/380 works well to 350whp but there is not much in reserve for anything past that .
Old 03-02-2010, 11:53 PM
  #18  
Registered
iTrader: (25)
 
TeamRX8's Avatar
 
Join Date: Apr 2005
Posts: 26,862
Likes: 0
Received 2,080 Likes on 1,694 Posts
^^well that depends on what fuel pump you have and how far you want to push duty cycle
Old 03-03-2010, 12:03 AM
  #19  
Boosted Kiwi
Thread Starter
iTrader: (2)
 
Brettus's Avatar
 
Join Date: Apr 2006
Location: Y-cat-o NZ
Posts: 20,584
Received 1,523 Likes on 863 Posts
Originally Posted by TeamRX8
^^well that depends on what fuel pump you have and how far you want to push duty cycle
not sure why you mention the fuel pump but yeah 350whp on 380/480/380 will be around 80% duty cycle .
Old 03-03-2010, 01:43 AM
  #20  
Registered
iTrader: (25)
 
TeamRX8's Avatar
 
Join Date: Apr 2005
Posts: 26,862
Likes: 0
Received 2,080 Likes on 1,694 Posts
that limit is dependent on fuel pressure, which is dependent on the fuel pump being used, which is dependent on why I mentioned it

engine efficiency too i.e. bsfc
Old 03-03-2010, 01:58 AM
  #21  
Boosted Kiwi
Thread Starter
iTrader: (2)
 
Brettus's Avatar
 
Join Date: Apr 2006
Location: Y-cat-o NZ
Posts: 20,584
Received 1,523 Likes on 863 Posts
isn't fuel pressure determined by the fpregulator which to my knowledege is the same part whether you run the stock pump or the walbro
Old 03-03-2010, 02:34 AM
  #22  
Registered
iTrader: (25)
 
TeamRX8's Avatar
 
Join Date: Apr 2005
Posts: 26,862
Likes: 0
Received 2,080 Likes on 1,694 Posts
the fuel pressure at the rail is substantially different between the two and the OE pump regulator was only designed to handle a certain bypass flow limit
Old 03-03-2010, 08:29 AM
  #23  
Registered
iTrader: (3)
 
olddragger's Avatar
 
Join Date: Apr 2004
Location: macon, georgia
Posts: 10,828
Likes: 0
Received 38 Likes on 27 Posts
Team is right.
I wonder if the 09 regulator is any different?
Does gas rail /line temp influence this too?
I know the rails can get to the 160-170F range under certain conditions.
Old 03-03-2010, 09:27 AM
  #24  
13B-RE
iTrader: (1)
 
ChrisRX8PR's Avatar
 
Join Date: May 2006
Location: Plymouth, MN
Posts: 695
Likes: 0
Received 1 Like on 1 Post
Its actually part of our install manual to move the 380cc into the primary location...

Chris
Old 03-03-2010, 12:52 PM
  #25  
Boosted Kiwi
Thread Starter
iTrader: (2)
 
Brettus's Avatar
 
Join Date: Apr 2006
Location: Y-cat-o NZ
Posts: 20,584
Received 1,523 Likes on 863 Posts
Originally Posted by TeamRX8
the fuel pressure at the rail is substantially different between the two and the OE pump regulator was only designed to handle a certain bypass flow limit
If that is the case I presume everyone who fits the Walbro will run rich and have to retune ?


You have already rated this thread Rating: Thread Rating: 0 votes,  average.

Quick Reply: Anybody tried running the 380cc P2 injectors in the P1 position ?



All times are GMT -5. The time now is 01:19 AM.