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Old 01-18-2014, 06:44 PM   #1
ViperThreat
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Default Dyno disappointment - injectors?

Hey all,

Went to get the car tuned yesterday, and got some pretty disappointing news about my power output.

Setup is:

Cobb SF Intake
Invidia Catless 3" DP
3" Magnaflow Catback
STI Intercooler
VF-39 Turbo

Dyno'd at 236whp/274wtq

That's a pretty far cry from the 350/350 (crank) that Cobb was quoting.


Anyhow, the tuner said my injectors were too small, and told me that Id benefit from upgrading them as well as my fuel pump, which I had planned on doing eventually anyway; but I still feel like those numbers are well below what they should be.

in searches, Ive seen many threads of people who have managed ~300whp on stock injectors. It leaves me to believe that something else my be wrong as well.


Ill post up the dynos once I can get to a scanner.

In the mean time, do you guys have an suggestions on what I can check into? Or what injectors you guys recommend? My goal is 300whp.
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Old 01-18-2014, 06:51 PM   #2
the suicidal eggroll
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It does sound like something is wrong, either mechanically or with the tune(r)
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Old 01-18-2014, 07:12 PM   #3
Blackfin
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What was the AFRs during this pull?

What was the timing doing? Did you log the pull?
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Old 01-18-2014, 08:19 PM   #4
ViperThreat
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Here are the printouts the tuner gave me. I dont think he logged it on my accessport. I can always run out and do a quick datalog though if you guys feel it might be helpful.




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Old 01-18-2014, 08:20 PM   #5
norexyet
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What kind of dyno? Some read really low but those numbers still seem lacking.
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Old 01-18-2014, 08:59 PM   #6
kozumasbullitt
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The TQ numbers look close to 350 at engine especially if you were on a mustang dyno.
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Old 01-18-2014, 09:54 PM   #7
ViperThreat
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Dyno is a Dynapack http://www.dynapack.com/
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Old 01-18-2014, 11:47 PM   #8
ViperThreat
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Ran 3 data logs:

deselected a few items that I didnt think were necessary, included injector duty cycle and fuel pump duty cycle..

Looks like the injectors are hitting 100% fairly early into the pull...

Log 1
Log 2
Log 3

Last edited by ViperThreat; 01-18-2014 at 11:52 PM.
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Old 01-19-2014, 12:35 AM   #9
JimmyBoyWRX
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Quote:
Originally Posted by ViperThreat View Post
Ran 3 data logs:

deselected a few items that I didnt think were necessary, included injector duty cycle and fuel pump duty cycle..

Looks like the injectors are hitting 100% fairly early into the pull...

Log 1
Log 2
Log 3

No expert here at all but would ignition timing normally drop to 7? Seems very conservative.
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Old 01-19-2014, 12:44 AM   #10
mcganz121
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You don't need injectors with that setup. I would suggest a fuel pump; however, I am not sure how much the stocker flows. Those numbers look like you are still running the stock td04.

I have heard good things about church though.
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Old 01-19-2014, 01:08 AM   #11
ViperThreat
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definitely running a vf39 right now..


I asked the tuner to make a safe tune for now.. just so I wouldnt blow anything while Im driving around.
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Old 01-19-2014, 08:52 AM   #12
Blackfin
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Although you've got questionably high injector duty cycles (e.g. log2, line 45) and you should think about an injector and possibly a fuel pump upgrade, your plot shows AFRs during that pull of 11.25:1 which would seem to be a pretty good number for power.

So, for safety, a fuel system upgrade would be a good idea but I think the cause of your power deficit (if there is one) lies elsewhere.

You're only making 14.3-psi at 6000RPM which seems very low for a VF39. I thought this turbo was able to hold better near redline. Maybe I'm wrong. Still, might be worthwhile checking for inlet restrictions, boost leaks or exhaust restrictions.
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Old 01-19-2014, 09:16 AM   #13
funk32
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Quote:
Originally Posted by ViperThreat View Post
definitely running a vf39 right now..


I asked the tuner to make a safe tune for now.. just so I wouldnt blow anything while Im driving around.
^^^ you asked for a safe tune and you got one I don't see a problem. if you asked to max out the setup then I would see a problem.
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Old 01-19-2014, 04:19 PM   #14
ViperThreat
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Quote:
Originally Posted by funk32 View Post
^^^ you asked for a safe tune and you got one I don't see a problem. if you asked to max out the setup then I would see a problem.

The power output wasnt much different on the stronger tune (255ish). Problem was that it was causing over-boosting which kept giving me a CEL for wastegate range/performance.


Anyhow... the turbo was hitting 21psi previously, so i know its capable.
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