Rybar

iTrader: (11)

Hey guys just swapped in all the above parts except for the cam. I currently have a mail order tune from TSP in the car right now.

After the ETP Heads, 36#'s & LT's the car is a having a very hard time starting (seems to flood very easily) I have to put my foot to the floor to get it to fire and when it does it runs very rough and poorly. And does not want to idle without my foot on the gas.

Now here is the kicker, it's running open headers right now as I have to get it to an exhaust shop to weld up my exhaust to the new headers.

I've unplugged my O2's and still the same problem, I removed a spark plug and it's wet like it's flooded.

I just bought HPtuners but have NO IDEA how to use it or tune, I don't know where to start, so please be easy on me. I can also post up my TSP tune for your review?

I know a couple of local guys who can tune, but have yet to have them tinker with the tune.

Are my 36# injectors and mail order tune causing the problem? Or is it mainly the open headers?

Rybar

iTrader: (11)

Here is the tune file

Old Geezer

iTrader: (3)

TSP tune B4 or after the changes?

Rybar

iTrader: (11)

This is the TSP tune for the cam only with stock heads, stock injectors etc. I haven't changed a thing as I don't know what to do.

foff667

iTrader: (2)

you need to scale for those injectors at a minimum man otherwise the computer is probably dumping in WAAAAY too much excess fuel.

caliswangin916

iTrader: (3)

i don't think your file is showing up for anyone. try attaching in a post on hptuners forum and link it over here. i'd like to take a look at it myself. i was/am trying to tune for some lucas 36lb injectors.

check your minimum injector pulse like foff667 said. i scaled mine as (IFRold/IFRnew) X 1.277 for the minimum injector pulse which equaled .790. seems to be working good besides some kr(might be my plugs).

Old Geezer

iTrader: (3)

I'd also suggest you not drive the car, until the above is done. You could wash some cyl walls, foul the O2 sensors, and generally raise hell inside the engine.

Rybar

iTrader: (11)

I posted on HPTuners: http://www.hptuners.com/forum/showth...6112#post76112

How do I scale for the injectors? Can somebody direct me to instructions or a process?

foff667

iTrader: (2)

shows up fine for me

just need to right click & save as an .hpt file

he's got them scaled for stock injectors it looks like which means his computer is now dumping in a bunch of extra fuel for no obvious reason & then having to try and trim out that extra fuel its thinking its supposed to be adding.

foff667

iTrader: (2)

as for how to scale your injectors there are excel files that do the work for you both in the sticky here or on the hptuners forum

Rybar

iTrader: (11)

OK, I looked up my injectors. 36# Accel injectors at 43.5psi rating are actually 37.1

I entered this value in the excel spreadsheet from this site: http://www.allmod.net/hpt/injectors.xls

Now I just enter these values to my tune with HPtuners?

foff667

iTrader: (2)

just remember your fuel pressure is going to be closer to 55-60 psi so in reality they are probably closer to 42lb injectors on your car...but yes just enter that right into the injector flow rate table.

Rybar

iTrader: (11)

Yes I understand LS1's run at 58psi, so should I enter them as 37.1 or 42 on the excel file?

Thanks for your help so far.

caliswangin916

iTrader: (3)

my 36lb lucas injectors start at 43.04 and ends with 47.12. your minimum injector pulse is still stock at 1.277, i set mine to .790 which made drivability much better but i don't know if that will apply to you since the other parameters of your tune are different from mine(injectors only). could just try it out.

foff667

iTrader: (2)

Where it says enter your values here is where you need to enter the known information.

Where it says Injector rated fuel pressure you'll put the injectors rated fuel pressure which you've already stated is 43.5

Where it says your fuel rail pressure you'll enter your fuel rail pressure or leave the default 58 in there.

Where it says your injector rated flow rate you'll put what the injectors are rated at which you've already stated is 37.1

Then the excel file will spit out your table.

Copy & paste.

Done.

Rybar

iTrader: (11)

Well I did it, wrote my first tune. The car still wouldn't fire so I removed a spark plug and it was wet and dripping with fuel. I ran out bought a new set of plugs, put them in and first try ...Viola! She started right up and idled perfectly for about 20 minutes or so.

foff667 I want to REALLY THANK YOU for taking the time to help me out with this. I really appreciate it. This site is great.

Ryan

Frost

iTrader: (45)

Will your injectors actually even be able to fully open and close with a minimum pulse width so low?

Camaro ChriSS

Feels pretty good doing your own programming, doesn't it? A little sense of self-sufficiency. Glad to hear you're doing well with things.

caliswangin916

iTrader: (3)

so far those settings are the best tune that i can find. i get kr up to 4* at light deecl-accel or light accel to decel points for about 1.5 seconds sometimes. i scanned for 27 minutes today and got 2 kr's at low speed (35-45mph). wot looks fine with no kr at low and high speed. rich decel restores to normal like stock.
i tried .690 and 1.300 for min inj. pulse yesterday and was getting kr up to 8* at low speed and often so after about 2-3 minutes of driving i went back to .790 and seems to be fine besides the minimal episodes of kr.
it was suggested to me that min inj pulse should be old ifr/new ifr X 1.277(stock) and it works as long as my scanner is telling me the truth.

Frost

iTrader: (45)

The scanner shows the commanded time, it's not a physical reflection of the injector's output though.

It sounds like there may be more than one gremlin here, why not try a half/quarter tank of 100+ octane and find out if that KR is even real.