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Old 06-30-2008, 05:14 PM   #1
b0nd18t
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Default how to tune for injectors

I do not know much about tuning. I got an online tune with my 650cc injectors but i want to try putting my stock injectors in. what would i need to edit in my tune to compensate for this and make sure its right? car is an 07 sti.
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Old 06-30-2008, 08:42 PM   #2
robbieshonda
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Fuel injector scaling and latency
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Old 07-01-2008, 01:42 AM   #3
ProdriveDreams
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injector flow is 565cc and i forget what latency is for those... I'm not near my tuning PC right now, ill check later if no one gets back to you.
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Old 07-01-2008, 08:24 AM   #4
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Thanks!

guess i could just load my stock map, or gabes stage 1, to find them now that I think about it
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Old 07-01-2008, 04:08 PM   #5
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just be sure that the tune doesn't actually need those bigger injectors. Changing the scaling will make the fuel trims work, but won't help if the injectors are pegged at 90% duty cycle.
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Old 07-07-2008, 01:40 AM   #6
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What about tip-in throtle enrichment? I changegd the scaling and latency, but now there's a bit of a stumble when I jam the throtte. Should I reduce the tip-in by the same percentage as I incresaed injector size? In other words, the new injectors are 57% bigger; should I reduce the tip-in by the same percentage?
Additionally, the idle is rough when coming off throttle.

I swapped stock injectors for DW 840s. Additional Mods: TGV delete, ported intake and TB, Tomei exh. header and 3" exhaust.
I'm still on the stock turbo as I want to figure out this tuning thing before putting in a bigger huffer.
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Old 07-07-2008, 04:52 PM   #7
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Beam,

Do you have a wideband? If not you shouldnt be playing around with the fueling tables.....

To answer your question, yes you can reduced the tip in enrichment table.....IIRC I cut mine almost in half after doing the TGV deletes.
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Old 07-08-2008, 02:10 AM   #8
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My blobeye WRX runs just fine with 565cc injectors with just setting the "Injector Flow Scaling". I suspect "tip-in" and every fuel setting map is corrected with a factor when adjusting this setting.

Last edited by Espen; 07-08-2008 at 06:09 AM.
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Old 07-08-2008, 02:18 AM   #9
Beam
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Quote:
Originally Posted by Phatron View Post
Beam,

Do you have a wideband? If not you shouldnt be playing around with the fueling tables.....

To answer your question, yes you can reduced the tip in enrichment table.....IIRC I cut mine almost in half after doing the TGV deletes.
Absolutely. LC-1 in conjunction with Ecu Edit.

Thanks for the tip. no pun intended.
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Old 07-08-2008, 11:28 AM   #10
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Quote:
Originally Posted by Beam View Post
In other words, the new injectors are 57% bigger; should I reduce the tip-in by the same percentage?
for tip-in changes:

original injector scalar / new injector = %

Multiply % to the original tip in table.
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Old 07-08-2008, 11:58 AM   #11
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Hmmm, some good advice. I didn't even think about tip-in changes.
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Old 07-08-2008, 12:39 PM   #12
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Quote:
Originally Posted by Espen View Post
My blobeye WRX runs just fine with 565cc injectors with just setting the "Injector Flow Scaling". I suspect "tip-in" and every fuel setting map is corrected with a factor when adjusting this setting.
In my experience, the 565cc can get away with just a scalar change and stock latencies. If you look at the JDM STIs that use "pinks" they have the same latencies as the USDM WRX 2.0L. However, the tip-in definitely needs to be adjusted with larger injectors. It may drive OK with the stock tip-in, but crisper response can be gained by tuning it, especially the low-delta areas that you spend a lot of time in.
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Old 07-08-2008, 02:44 PM   #13
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Quote:
Originally Posted by robbieshonda View Post
Fuel injector scaling and latency
[IMG] screen shot[/IMG]
Hey, that looks familiar!

Justin (05 STi)
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Old 07-08-2008, 08:19 PM   #14
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I think tip in is more of a crap shoot, but I would generally reduce the values with larger injectors and work from there.
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