9krpmrx8's Boost Build Thread
#3028
No respecter of malarkey
iTrader: (25)
okay guys, I had my injector banks all screwed up. I need your help clarifying some things because there appears to be different info out there.
2004 6 speed manual
Bank 1 = Reds (first 2 injectors from inboard out)
Bank 2 = 1 first yellow and last yellow (from front to back) or secondaries
Bank 3 = two middle yellows (from fron to back) or primary secondaries aka P2's
Okay, I have stocks reds, and stock yellows in the secondaries and stock blues in the P2 location.
based on the formula provided by Cobb below and Brettus, my bank 3 should be set at 600 (601 to be exact) right?
So my formula would be:
(480cc/380cc) x 476 = 601
Right? Thoughts?
2004 6 speed manual
Bank 1 = Reds (first 2 injectors from inboard out)
Bank 2 = 1 first yellow and last yellow (from front to back) or secondaries
Bank 3 = two middle yellows (from fron to back) or primary secondaries aka P2's
Okay, I have stocks reds, and stock yellows in the secondaries and stock blues in the P2 location.
based on the formula provided by Cobb below and Brettus, my bank 3 should be set at 600 (601 to be exact) right?
So my formula would be:
(480cc/380cc) x 476 = 601
Right? Thoughts?
Yes & no. Without fuel pressure compensation against boost pressure the actual injector flow rate decreases with boost. At least I'm not aware that you have compensated fuel pressure correction (most Renesis turbos don't) so that might be a fail for me.
.
#3029
SARX Legend
Thread Starter
iTrader: (46)
I am running the BHR pump, that is it for fuel upgrades. It just goes rich as fawk. When I look at all the tables everything looks good to me but I am still a newb.
Last edited by 9krpmrx8; 11-05-2012 at 09:03 PM.
#3034
No respecter of malarkey
iTrader: (25)
it's going rich for other reasons as noted. Just pointing out that atmospheric measurement of fuel injector flow rate decreases with boost pressure without fuel pressure compensation. So as a made up example; 600 cc/min atmospheric might be 400 cc/min or less at 14 psi boost without fuel pressure compensation. It would be the same approx. flow as having 14 psig less fuel pressure because boost pressure is working against fuel pressure as it is being injected. Yes, it takes modifications to the OE system as mentioned, but then also doesn't require as much injector sizing either for a given power output. Just something many people have overlooked when sizing injectors for this application
#3039
Registered
iTrader: (7)
Since we're talking about injector latency I have a quick question.
How is injector latency affected by upgrading/uncapping the stock injectors?
I'll be sending out the stock yellow P2's to KG Parts and was curious about the possible latency difference because the latency for the P2's and Secondaries can only be adjusted together on the same table.
Will the Latency tables require any changes?
Edit: Since Injector Latency is the time it takes for the Injector to open that's something that shouldn't change when KG Parts upgrades them correct?
How is injector latency affected by upgrading/uncapping the stock injectors?
I'll be sending out the stock yellow P2's to KG Parts and was curious about the possible latency difference because the latency for the P2's and Secondaries can only be adjusted together on the same table.
Will the Latency tables require any changes?
Edit: Since Injector Latency is the time it takes for the Injector to open that's something that shouldn't change when KG Parts upgrades them correct?
Last edited by kma5783; 11-06-2012 at 12:26 AM.
#3041
Modulated Moderator
iTrader: (3)
Since we're talking about injector latency I have a quick question.
How is injector latency affected by upgrading/uncapping the stock injectors?
I'll be sending out the stock yellow P2's to KG Parts and was curious about the possible latency difference because the latency for the P2's and Secondaries can only be adjusted together on the same table.
Will the Latency tables require any changes?
Edit: Since Injector Latency is the time it takes for the Injector to open that's something that shouldn't change when KG Parts upgrades them correct?
How is injector latency affected by upgrading/uncapping the stock injectors?
I'll be sending out the stock yellow P2's to KG Parts and was curious about the possible latency difference because the latency for the P2's and Secondaries can only be adjusted together on the same table.
Will the Latency tables require any changes?
Edit: Since Injector Latency is the time it takes for the Injector to open that's something that shouldn't change when KG Parts upgrades them correct?
#3044
Registered
iTrader: (7)
I know it changes with fuel pressure, voltage and barometric pressure, but isn't that taken into account in the latency tables, I know with other Ecu's and applications it is. I'm on my phone so I can't look right now and haven't really done much with tuning just starting to do some research now.
Now the question is, since the P2's and Secondaries will have different latency's does the table have to be changed at all because they can't be adjusted independently?
Now the question is, since the P2's and Secondaries will have different latency's does the table have to be changed at all because they can't be adjusted independently?
#3045
WENTGERMAN
iTrader: (6)
Why would the latency change? The actuator is the same voltage and resistance. All you are doing is allowing more fuel to come out. The internals stay the same its not regulated by the cap. When switching to id or an rc injector or possibly to s2 injectors you'd need to change it due to different resistance on the actuator.
It adjusts according to the baro and battery voltage, but the adjustments are a calculation using the latency that we input. It won't recalculate the latency it just uses it as a reference.
Thats how I understood it at least... but I have adhd so I get confused allot.
It adjusts according to the baro and battery voltage, but the adjustments are a calculation using the latency that we input. It won't recalculate the latency it just uses it as a reference.
Thats how I understood it at least... but I have adhd so I get confused allot.
#3048
WENTGERMAN
iTrader: (6)
If that is the case removing the caps would not effect it at all. The only reason you would need to adjust this is if the actuator was getting old and damaged and no longer operating at the specified resistance.
I just read a little bit and found some more info. The values can be effected by manifold pressure and fuel pressure.
So that would explain why the boosted guys would need to look at this table.
#3049
Modulated Moderator
iTrader: (3)
Injector Dynamics - Drillbits and Dipshits
Have a look at this...and then read a couple of the other fuel injectors articles on this site and it will likely make things clearer
Have a look at this...and then read a couple of the other fuel injectors articles on this site and it will likely make things clearer
#3050
SARX Legend
Thread Starter
iTrader: (46)
Thanks for the link, good stuff. I put the injector bank 2 values back to where I had them a few tunes ago and upped the bank 3 to 700 and the car is driving well again. Not perfect, still some rich spots under certain conditions but not 10.0 and misfiring rich. This will do until I get time to log an retune this weekend.
Did a quick pull to 7,000RPM or so. Oops,
http://www.flickr.com/photos/9krpmrx8/8162325122/
Did a quick pull to 7,000RPM or so. Oops,
http://www.flickr.com/photos/9krpmrx8/8162325122/