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Injector Duty cycle logged at 124% with 550s at 17 psi on 16g

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In a full weight 95' GSX 5 spd. With a Fp big 28, 190 pump,550's, SAFC, MBC, 2 1/2 Exhaust, UICP, 1G BOV on 18 psi.

I am trying to help, just try it.

GSXTACY
 
Originally posted by Mitsuturbo
i have upgraded to 650cc injectors and it helped immensely, but now i'm running at 99-100% IDC

wondering if i should go with 720's now :confused:

Have you raced the car at the track?

There is no way a 16g should need 720's. I think your tuning is bad.
 
Originally posted by gsxtacy
Zero with 550's would be -18 because 550's are 18% bigger.

Zero for 650's would be -36 and so on.


I have no idea where those numbers came from, but they are weird.

The formula you want to use is:

SAFC Correction = 1-(450/newsize)

For 550's, that gives you -18%.

650's comes out with -31%.

550's are NOT 18% bigger than 450's, they are 22% bigger. When you invert that and then take it out of 1, then you get the correction which is 18%.
 
I figured it was just a typo, not a big deal. I just wanted to have it right for the archives!
 
Originally posted by kpt4321
Have you raced the car at the track?

There is no way a 16g should need 720's. I think your tuning is bad.
Yes, i have. On the small 16g, with full interior, and spare/jack in trunk (FULL weight), at 4700ft elevation, i ran 13.4, with the 550's and all stock IC and piping. Engine's bored .040 over, with 9:1 compression, and a very ported head.

BTW, in case you forgot.. i drive a GVR4.
 
Originally posted by Mitsuturbo


My base timing is about 7 deg, i believe.


Turn your base timing down to stock, 5 deg. BTDC. I agree with everyone else. YOu are running pig rich man. I'd start checking fuel lines, fuel pressure, etc.
 
Originally posted by NOSLO2PT0
Turn your base timing down to stock, 5 deg. BTDC. I agree with everyone else. YOu are running pig rich man. I'd start checking fuel lines, fuel pressure, etc.
You'd think that, but with O2s, EGTs, and Knock being in order.. you're wrong.
Any less fuel = tons of knock, more fuel = runs like shit
base timing is between 5 and 7, wherever I set it with the ITC actually, itc is set not too aggressively, less timing yields a LOT less power, more timing = possibility of knock, here and there

i just did some checking with MMCd Logger instead of pocketlogger software, and it's putting me in the butterzone for IDC at about 89%
now.. what i don't get.. is on MMCd, the iDC does not equivocate in any way as far as i can see, to iPW.. since i turned up fuel (another 10%) to try and hit 100% on mmcd software on iDC, i managed to get it to 98%, but the car ran so poorly of course, that it was only for testing purposes.. however.. at lower iDC, i was seeing a higher iPW. For example.. 20.22ms @ 84.33% IDC.. whereas further up the log i see 19.19ms @ 94.5% IDC, with the iDC and iPW fluctuating a bit between each other.. but no indication that iPW = iDC.

now.. one of these softwares may be right, and one wrong.. or maybe both are wrong
 
Originally posted by Mitsuturbo
but no indication that iPW = iDC.


That's because you're missing another factor: RPM.

IDC is dependant on IPW AND RPM. The faster the engine is spinning, the less time the injector has to open each cycle, so IDC goes up without IPW going up.
 
Originally posted by kpt4321
That's because you're missing another factor: RPM.

IDC is dependant on IPW AND RPM. The faster the engine is spinning, the less time the injector has to open each cycle, so IDC goes up without IPW going up.
ah! thank you! excellent point

Now i just need to figure out which software is more "correct". MMCd, or DSM Logger.
 
It's a simple mathematical formula, they should be the same.

If you log the IPW, you can solve for IDC yourself.
 
Thanks guys!
The taboospeed table will be going into my hardcopy "book" i've been compiling over the years. Should help a lot with figuring out what is going on here.
 
Oh, and my MMCd log is in direct accordance with that table on Taboospeed's site. I am assuming, at this point.. that the DSM logger software is much further from accurate than MMCD.
 
I think somebody's forgetting that Misuturbo removed his stock MAF and installed a 2G MAF.

Hey where's that Bang-Head-On-Door icon?
 
he is running a bit rich in comparision to most with his set up, but he is at a fairly high elevation, and some cars just run lean for some reason.

im running a small 16g and 550s, with a 2g mas w/lower honey comb removed and if i set my idle below +12 it goes out of closed loop. and im above +5 all the way across my high map to keep the o2 at or above .90(although i cant really tune it right since the idiot mechanics that installed my engine didnt hook my knock sensor up, so i have to run my boost as low as my gate will go, tune by o2 voltage, and pray i dont detonate)
 
Most of you are forgetting that this guy has a 2g maf which lowers the incoming air signal considerably, thus the need to still increase fuel settings. I have tried this setup, however your 124% DC seems screwy - I wonder if it's not being reported right, as my 550's used to lock up at around 100%.
 
Originally posted by Cirus_93TSI
he is running a bit rich in comparision to most with his set up, but he is at a fairly high elevation, and some cars just run lean for some reason.

im running a small 16g and 550s, with a 2g mas w/lower honey comb removed and if i set my idle below +12 it goes out of closed loop. and im above +5 all the way across my high map to keep the o2 at or above .90(although i cant really tune it right since the idiot mechanics that installed my engine didnt hook my knock sensor up, so i have to run my boost as low as my gate will go, tune by o2 voltage, and pray i dont detonate)

why dont u just hook the knock sensor back up?? and after a little bit your car will start to retard timing alot and the car wont even boost up with out the knock senser plugged in.
 
this is off topic here,

so then would 780s be a waste of money when running a Big 16g at 18psi?
i mean im sure you would never max out this injectors running this much psi.
im wondering cause someone here said that you would never max out 750s. I have on order a 255lph walboro and next week im getting the fullthrottle FPR with a BM gauge, so im sort of stuck on fuel injectors to get.

thanks guys...oh and very interestin info on this here posts
keep up the good work guys:thumb:
 
I try to buy injectors that won't be maxed out at the highest boost level that the turbo I have will spit out.

For a big 16G, I think you need something bigger than 550s for that to be true.
 
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