exopar

Hi there to all. Been reading a lot in this forum but still can not get in the right direction, so.....

Whould like to know if someone of you whould take an eyeball to my datalog and/or modified bin and give me some leads where to work in order to improve power and fuel economy.

So far been arriving in to something more or less decent in fuel tables but have sever doubts in SA tables. Some numbers in my timming tables are as high as 42 deg but still got 0 knock when dataloging.

Been working with BJYN based bin and engine is a 350 vortec heads TBI true dual long headers and flat pistons.

I am not near an expert in chip burning but think have some idea on bassics then It will not be that difficult for me to understand your leads.

So, please, someone put your hand in your heart and help me...... please

Ronny

iTrader: (1)

There are Vortec based timing tables posted here. Search Fast355 or Liquid8(?). If you are looking for max SA WOT that is best determied on a dyno or tune for highest MPH in 1/4 mile.

liquidh8

Search my username, I think I posted mine. They were similar to fast355's. My timing was high too in the lower RPM vs MAP area, but I never got any knock and it lickes it. Ihave vortec heads, speed pro forged flat tops. Compression was pretty high, and I spray it so... I have to dig through my computer to try and open up my bin. I have been playing with my turbo buick alot lately.

Are you using the ebl? or the 7747 factory?

liquidh8

These are what i think I am still using. I would actually have to hook the laptop up to the car to see my current bin number. But these should be close to what I am using. I have the n2o table pulling spark out for the spray, and I was 89 octane gas. So with 91/93 my lower MAP vs RPM spark numbers would be a bit higher.

Just give it what it likes, as told by a wise man to me a long time ago. I was so worried about running over 32d total at WOT, but this engine wanted more. Even though they say the vortecs don't like all that much timing. I had some track time too when I just played with the WOT spark, the lower part was me getting rid of surge and getting the pull while the engine was lugging in overdrive with the converter locked.

Give this a try if you'd like, but as with any bins, use at your own risk!

liquidh8

and this link from a while back, you see how much mine changed from these ones I started with.
https://www.thirdgen.org/forums/diy-...ark-table.html

exopar

Very nice and helpful.

Will give a try with this tables and see what comes out.

Also have noticed this engine not to reach 100 KPA`s
It moves between 30 and 70`s high all the time.

We are tunning very high over sea level (2250mts) but I still think It should be reaching at leats 85 - 90 right?

All 8 cilinderas have 120 steady psi compresion and seems by the way it idles no leack in the system. Runs very rich when cold startup and still can not get rid of this problem.

May this kpa`s been affecting my overall power? I really do not know how to cure it.

exopar

Are you using the ebl? or the 7747 factory?[/quote]

Using 16197427, factory calibration was BRDW and did switched to BJYN.

[IMG]file:///C:/DOCUME%7E1/ADMINI%7E1/CONFIG%7E1/Temp/moz-screenshot.png[/IMG][IMG]file:///C:/DOCUME%7E1/ADMINI%7E1/CONFIG%7E1/Temp/moz-screenshot-1.png[/IMG]Attached a viw of my current spark table.

liquidh8

You can take a vacuum pump and check the MAP to make sure it is working correctly. Cold idle was a pain, the are some posts on here to help with that, since there are a few tables that affect cold idle.

I am using the EBL, so you are gonna have to take what I have a scab it into the stock 7747 bin you are running. Since the 7747 spark tables aren't as defined as the EBL.

Saar

2250 meters? according to this chart, that seems right.

Ronny

iTrader: (1)

https://www.thirdgen.org/forums/diy-...tec-heads.html

Ronny

iTrader: (1)

https://www.thirdgen.org/forums/diy-...ng-8746-a.html

exopar

Thanks to all for your patience, support and share of knowledge.

Here a do have a trick question. Have play a lot with SA tables and ended up with a modified Hyperjunk table having more or less results. Question is why I do feel mcuh better power on my truck having a much less agresive timming curve?

Previous tables has not shoe any knock neither this one.

Is it not true that the more timming without knocks the better?

Now, with $0D definition it is my beleive that increasing speed for close trotle Spark table and decreasing this table numbers I can helping the engine to decelate and even get some mufle back fire or poping efect, am I right?

Saar

up until a certain point, yes. after that, it can actually cause a loss of power due to the expanding gases starting to push the piston down near the end of the compression cycle.

i have heard of this happening before, and generally, the more advance you pull, the more the engine braking will become apparent. not sure which directionn you need to go to get the popping/backfiring...

Ronny

iTrader: (1)

Ideally the spark table needs to be addressed on a dyno. One thing OEM looks at beyond the obvious HP is oil temp and probably emmishions. Lack of a dyno opportunity suggests the thing would be to try 1/4 mile MPH with changing SA at WOT.