injector tune stuff

[1quick]

Phatride is going to help me get a base tune sorted out so i can drive the car, i know nothing about tuning at all not a fucking thing lol can someone show me a injector table for stock or any size injector really and just a basic run down of how you scale it so i can throw something together thats somewhat close before he comes over so were not fucking with it all night

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[ktraver97ss]

Nope, but subscribed to see the answers.

 

[Turbocharged400sbc]

I don't have anything near me to give you a hand but just remember the HP Tuners And DHP calculate inversely the tables are inverse to each other one is grams per millisecond the other is milliseconds per gram

 

[ktraver97ss]

One sentence and Im lost. Fuck.

 

[GTPpower]

Are you using DHP or HPT?

 

[1quick]

either he has both wich ever is less work lol

 

[1quick]

the place i bought the injectors from sent me a file with the 95lb injector tables for different lsx cars but the number mean nothing to me since i dont understand how it works, and i dont even know if the numbers are close to what it would be for a 3800 anyway

 

[GTPpower]

Here is the way I've always adjusted it with DHP. It's always worked well for me:

Click on "bin prep stage 1"

MyTune



But, with your fuel system, I would use HPT since someone made this spreadsheet that accounts for fuel pressure.
General V6 Information

 

[GTPpower]

Actually, it looks like the link to that spreadsheet is dead....I have it on my computer at home, but I don't think it's on my work computer.

 

[1quick]

Here is the way I've always adjusted it with DHP. It's always worked well for me:

Click on "bin prep stage 1"

MyTune



But, with your fuel system, I would use HPT since someone made this spreadsheet that accounts for fuel pressure.
General V6 Information

that mytune link oh yeah that dude speeks my language lol

 

[GTPpower]

I will have to post the HPT spreadsheet when I get home from work, if someone doesn't post it before then.

 

[1quick]

that way that dude talks i take 80 devided by 95 get .842 so i knock 15.8% off the whole table thats currently in there and im good or is there more to it than that

 

[GTPpower]

Yeah, that works....That should get you close. I'm just assuming your fuel pressure is different with the changes you made this year.

 

[Turbocharged400sbc]

To get it to run okay all you need to do is shoot for within 20 percent of "perfect"

 

[1quick]

so are you saying it should run ok now? i remember when i switched from 42's to 60's my old car ran still, this damn thing dosnt want to start, it is always hard to start but now it just wont unless i create a vacuum leak

 

[GTPpower]

It should still run.

I tuned a car about a month ago. The guy drove about 90 miles to me on a pretty much stock PCM file, but he was running 42.5lb injectors and a LQ4 MAF. It didn't run very well, but it still ran.

 

[1quick]

it runs when i pull the fuse for the fuel pump and the pressure drops down to 40 for a few seconds untill its out of fuel, and it runs if i pull the brake booster hose but with base pressure of 58 is dosnt run if everything is hooked up normal

 

[GTPpower]

Maybe the extra 15psi of pressure is screwing it up more than I think. I guess I would adjust your injector table, and see what happens.

 

[ktraver97ss]

I'd be scared of Fing it up and wait for phatride. I have been wanting to play with mine now that im figuring dhp out a bit, but Im too much of a pussy.

 

[1quick]

its the same base pressure that i ran last year im still useing the stock regulator in the tank i just ran a vac source to it so it will raise with boost, i tryed it with the vacuum hooked to it and not, at first i thought i messed up the fireing order or something because it would crank over for a while sound like it was going to start then backfire or pop loud out the exhaust, but if that happens and i pull the fuse for the fuel pump it fires right up and sounds normal, i guess ill find out tonight

 

[1quick]

I'd be scared of Fing it up and wait for phatride. I have been wanting to play with mine now that im figuring dhp out a bit, but Im too much of a pussy.

yeah im not touching the tune i dont know anything about anything when it comes to tuning, im just trying to think of things to look at so phatride isnt messing with it all night

he is picking up his new gtp tonight im sure he would rather mess with that then my turd

 

[GTPpower]

Well, I found the spreadsheet, but this forum won't let me upload it because the file type isn't supported. If you post or PM me your email, I'll send it to you.

 

[PANDA]

mods?

 

[Handsome Jesus]

time to start reading some shit on the internet about the basics while you wait for phatride.

 

[02BlueGT]

DHP is not fun, HPT FTW.


In HPT:

Here is a stock fuel INJ Table with 33# Injectors:

Inj Flow______Manifold KPA

36.10_____0
36.51_____10
37.03_____20
37.76_____30
37.91_____40
37.99_____50
38.04_____60
38.10_____70
38.14_____80
38.28_____90
38.40_____100

If you go higher than 100, the computer scales up for you. To use 95# injectors you would take 95/33 = 2.878787878788. So you would take the table above and multiply the flow by 2.8787878788. This would scale your injectors. But the factory table is not correct (it is usually witin +/-5%, but not perfect)
The only way to correct for this is to use the DIC and compare actual fuel used vs what the DIC says. Have some fun with Excell or a calculator and paper and get it to 100% accurate. But I won't get into that yet.


Or do it the lazy man inaccurate way and put 95 in all the cells and Ghetto-rig your MAF table to compensate (bad idea). There are dozens of ways to tune and get similar end results on a dyno. Making the car run right in all weather and seasons requires doing it right though.