Thread: Maxed Out Injectors

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2009-01-16 21:26:55

#11

BenFenner

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180 WHP sounds about right, as I remember no higher than 80% duty cycle at 150 WHP.

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2009-01-16 21:28:25

#12

jagy

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Originally Posted by BenFenner

Maybe I should go back and look through my logs and see what duty cycle I got at 150 WHP from the stock injectors, stock fuel pressure, stock fuel pump.

Would be nice.

What duty cycle is max safe? As my new setup will like 170-175whp maybe...

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2009-01-16 21:53:36

#13

jp314

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Very good IDC discussion here, from 2006:
Max Power With Stock Fuel System? - SR20 Forum

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2009-01-16 22:22:56

#14

macakin

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get some VE injectors

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2009-01-16 22:44:41

#15

BenFenner

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Originally Posted by jagy

What duty cycle is max safe?

Most people like to quote 80% max as the comfortable, "safe" limit. Most OEM cars tend to follow this, however the BMW e30 325is reaches 100% in stock form, and they've been reliable over the course of 30 years so clearly there's more to it. Some injectors are better than other at resisting overheating (the problem with high duty cycles) than others. What else is new? =]

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2009-01-16 22:47:48

#16

jen36

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thats a good link^

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2009-01-17 03:38:16

#17

erick212

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Originally Posted by robj80

so that's just slightly over 4bar correct? I thought for sure I was 5 or so. Eighther way the car runs great with the tune. Zero drivability problems. I do have so wierd cold weather related problems but seriously at my mileage I can not complain.

If the engine ever goes I'm probably going to throw another lowport DE in and leave the 259's.

You are correct it was 2 or 3psi above 4bar...

I do not recomend this unless you have a very good tune and run a wideband... Also Rob never turned up the boost(best i know) more than what it was tuned for 6.5psi. I like a little more head room but, it proves that it can be done.

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2009-01-17 12:43:20

#18

robj80

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well the reason I was getting 6.5 was because the wastegate bracket was bent. Jay had put a bleeder valve on the wastegate line to get me up to 6.5 psi. I had taken off that valve and was boosting 4psi for awhile. One day determined to fix my problem I disconnected the line all together and took it out for a spin. sure enough still got 4psi. Then for the hell of it I bent the wastegate back thinking that no way it was going to work. Well it did and I still didn't have the vac line hooked up. I thit about 12psi in a split second. I put the line back on and it was about 7psi but the wastegate was squeeling like a pig. Maybe a little whole in the diaphram. I put a home depot boost conrtoller on and it made the noise go away? Unfortunately the lowest setting still added about 1 psi. So actually I'm running 7.5-8psi with my lil 259 cc injectors.

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2009-01-17 15:28:26

#19

NissanGuy

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Originally Posted by jp314

What did you add?
Maybe the mods only added area under the curve, or shifted the powerband, maybe didn't add much peak power?
Hard to tell until you put it on the dyno.
You could get an ECU reader device so you know what your duty cycle is -
techtom, nisdatascan, etc.

Yesterday I saw 83% peak injector duty cycle, 4.58 volts on maf,
at -12 F ambient temp. Stock 259cc injectors. Greddy SP 2" exhaust.
It dyno'd 162whp @ 87 deg F with full 3" exhaust, 83.4% idc:
Dyno day results! - SR20 Forum

my last dyno i was at 167whp, since then iv added a Clutch and 8lb fidanza, after those are broke in ill be throwing in a JWT ECU and SAFCII

im just going to have to jump on the dyno to check things out

Originally Posted by macakin

get some VE injectors

after reading this post thats what i was thinking
http://www.sr20-forum.com/all-motor/11920-should-i.html

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2009-01-17 19:21:28

#20

AaroNX

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Yeah I started that thread and will be getting them soon. Better off to have a slightly bigger injector running at a lower cylce, than to risk having issues.

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