APS ST Osiris tuning help!
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APS ST Osiris tuning help!
my tuner is telling me that i'm maxing out 660cc injectors. he says they're at 130% duty cycle. i'm on uprev osiris.
my setup
APS ST kit
stock maf
walbro pump/660cc injectors
am i crazy?? i know i dont know much about tuning, but how could 660cc injectors be maxed out, 130%, at 4.5psi of boost. he says the car is currently making 370ish hp. does he have to redo the scaling or something? i understand the stock maf will need to be rescaled but i'm still confoosed as to why my injectors arent enough. any input is appreciated. should i find a new tuner?
my setup
APS ST kit
stock maf
walbro pump/660cc injectors
am i crazy?? i know i dont know much about tuning, but how could 660cc injectors be maxed out, 130%, at 4.5psi of boost. he says the car is currently making 370ish hp. does he have to redo the scaling or something? i understand the stock maf will need to be rescaled but i'm still confoosed as to why my injectors arent enough. any input is appreciated. should i find a new tuner?
#2
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Your MAF will be maxed out around 380whp so it doesn't matter the injector size at that point. You can't rescale it, you need a new one and a new tune to go with it. He's pegging the right side of the fuel map.
FWIW I made 420whp with 440cc and walbro (with HPX MAF), so I doubt injector size is your problem.
FWIW I made 420whp with 440cc and walbro (with HPX MAF), so I doubt injector size is your problem.
Last edited by djamps; 09-26-2011 at 09:27 AM.
#3
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do you have a fuel return?
I have 715cc injectors and we ended up running close to 70% duty at redline. I'm guessing it was running so high because of the pressure drop since I do not have a fuel return.
I'm 5AT and making 350hp to the wheels @ 6.5 psi on a vortech V3 SC kit.
I have 715cc injectors and we ended up running close to 70% duty at redline. I'm guessing it was running so high because of the pressure drop since I do not have a fuel return.
I'm 5AT and making 350hp to the wheels @ 6.5 psi on a vortech V3 SC kit.
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ya, 130% is an unobtainable number so the calculation is obviously off.
if you were running out of injector it would be lean under load. if it's not lean and he's just going by the incorrect 130% duty cycle then you aren't out of injector.
370hp doesn't seem near enough to max 660's.
if you were running out of injector it would be lean under load. if it's not lean and he's just going by the incorrect 130% duty cycle then you aren't out of injector.
370hp doesn't seem near enough to max 660's.
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#8
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Either way with 660's you should be good up over 450whp. I have tuned dozens of DW600's(which is actually around 680cc's) well over 450whp with a lil room on top...
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okay thats good news. i knew i couldn't be out of injectors. is there any difference between the pmas hpx maf and the uprev maf? are they the same thing, just rebadged? i will be gettin fully tuned once i'm out of the military and back in california. aiming for 500+whp, don't worry i'm not on a stock block :]. i jus needed something safe on the road for now. thanks for the help guys, much appreciated.
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I have same S.T. setup on built short block, walbro 255, 650cc DW injectors, Uprev MAF, forge actuator with green spring and will not make more than 6-8lbs. At that boost level making a little of 400rwhp. My old setup with a Vortec was making same power on stock internals. The whole point of me going the short block route was to boost it up and shoot for 500rwhp. If you find an answer please let me know since our setup is pretty similar.
Jeremy
Jeremy
Last edited by jtroger2212; 10-07-2011 at 03:01 PM. Reason: forgot a comment
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I have same S.T. setup on built short block, walbro 255, 650cc DW injectors, Uprev MAF, forge actuator with green spring and will not make more than 6-8lbs. At that boost level making a little of 400rwhp. My old setup with a Vortec was making same power on stock internals. The whole point of me going the short block route was to boost it up and shoot for 500rwhp. If you find an answer please let me know since our setup is pretty similar.
Jeremy
Jeremy
If you don't have a boost controller then your boost will always be spring pressure.
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fact of the matter is nobody running very high hp is using osiris tuning solely. One guy on here has a thread about it. he was up around 680 something with the haltech and he wanted to see how well the osiris performed. I think he barely broke 600 after changing all his stuff around to run the osiris. that's the highest hp so far on our cars with only the osiris controlling it. So since uprev knows this why design something for a customer that doesn't exsist.
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They probably designed it only to 600hp to give the best resolution possible while still giving a decent amount of hp.
fact of the matter is nobody running very high hp is using osiris tuning solely. One guy on here has a thread about it. he was up around 680 something with the haltech and he wanted to see how well the osiris performed. I think he barely broke 600 after changing all his stuff around to run the osiris. that's the highest hp so far on our cars with only the osiris controlling it. So since uprev knows this why design something for a customer that doesn't exsist.
fact of the matter is nobody running very high hp is using osiris tuning solely. One guy on here has a thread about it. he was up around 680 something with the haltech and he wanted to see how well the osiris performed. I think he barely broke 600 after changing all his stuff around to run the osiris. that's the highest hp so far on our cars with only the osiris controlling it. So since uprev knows this why design something for a customer that doesn't exsist.
I will soon switch to my Haltech setup since i want the failsafes and to control my meth/N02 injection, boost etc. But right now im just enjoying having the car back on the road lol.
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I think your actually referring to my post. I own a Haltech setup but wanted to see what I could get out of Osiris, yea at 600rwhp @6krpm it just misfired. But we ended adding a HKS ignition amp we had laying around and that problem was solved, i ended up making 633rwhp/664ft-lb. The day prior Z1 tuned an APS Extreme car (GT3076 w/ tiny housings) on Osiris w/HKS ignition amp and made 724rwhp. So it is possible to make big power using Osiris, especially on dual TB cars, i think GTM just made 880ish on a 370, but you have to upgrade the ignition system if running Osiris.
I will soon switch to my Haltech setup since i want the failsafes and to control my meth/N02 injection, boost etc. But right now im just enjoying having the car back on the road lol.
I will soon switch to my Haltech setup since i want the failsafes and to control my meth/N02 injection, boost etc. But right now im just enjoying having the car back on the road lol.
ya, with the 370 they wouldn't need to make any bigger maf's because they use 2 so it would have 2 maf's that can read 600hp worth of flow. Same concept on how the HR's don't need to upgrade their oem maf's to go over 400hp like the single maf DE cars.
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