Boost+Timing+Octane

OK this thread is for people to post up what PSI, timing and octane they are running. Ive been scratching my head trying to figure how hard I can push my 5.3 with 93 pump gas so hopefully this thread will help. When I had the truck tuned it was tuned for 9psi and 16 degrees of timing. I recently turned it up to 13psi to beat a modded 5.0 and I was wondering how safe it is. I know I shouldnt have done it without running a log to see if I have any KR but it ran like a scalded dog. AFR was right at 11.0. How much boost/timing can I safely run on pump 93 octane? No meth right now and E85 is out of the question in Louisiana.

8lbs, no meth, 91, 16* has Been good an safe for me

I tend to push stockers very far.

When either on racegas or pure meth injection i tend to use the rule of .5* reduction for every lb of boost

Using the tables were if iats are over 120 i start yanking timing. If ect are over 180 i pull timing some

Pure 93 ill use 2* deduction for every 2 lb of boost

So with that method George, where do you start the add boost/ reduce timing method

Around. .60 g/cyl would be my highest timing then it ramps down till 1.20 were it flatlines. As for amount of ramp will depend on how your timing table looks. I also use decimal points to help with transitions.

As for different boost levels i have different tunes for different psi

I also have track tune and street tune. I wouldn't chance running track tune on street

Also note as power level rises so will heat range of plugs. For power in the 700s br7ef is to used. For power in the 800s i use a 8series plug (exact number is at home).
Using this method has shown good marks on the strap.

As power rises so will your plug gap close

Ok, Im running br7ef's right now so that should be good. I need to do some logging. From what Ive been reading it sounds like I was pushing it a little with 13 psi, 16 degrees of timing and 93 octane.

Every combination out there is different. Why don't ya'll learn how to read plugs and give the motor what it wants?

doesnt that require cutting them open or requires special tools?

I use a lathe, but you can use a 1/2" drill and a hacksaw.

we have a e85 station in bossier man

Yea but thats an hour trip one way! Ill go through 1/4 tank just on the way back to Ruston. Plus there arent any stations down south where Ill be moving to in a few months so I dont want to get addicted to it and not be able to get it lol.

Just do a pure meth kit

yea thats what Im going to do. I just did a little logging and found out I had the stock IAT timing table. I was only working with 11 degrees. We changed that table up a bit and ran it at 13psi, 14.5 degrees and it feels really good. IAT's only got up to 108 degrees and ambient is 88. Had like 1 or 2 counts of knock so I dropped it down to 11psi for the street. I guess Ill keep it 13 or lower without the meth kit. What kit should I go with? I hear Alky Control is the best.

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Originally Posted by o2camaross

yea thats what Im going to do. I just did a little logging and found out I had the stock IAT timing table. I was only working with 11 degrees. We changed that table up a bit and ran it at 13psi, 14.5 degrees and it feels really good. IAT's only got up to 108 degrees and ambient is 88. Had like 1 or 2 counts of knock so I dropped it down to 11psi for the street. I guess Ill keep it 13 or lower without the meth kit. What kit should I go with? I hear Alky Control is the best.

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i prefer Julio's products [alky control]

something else to consider.....static compression will play a role on timing, chamber size, how much overlap a cam has, overall motor temp and etc.
a small cam which has none to neg amount of overlap wont take as much timing as something that has a good bit of overlap
restrictions Post turbo will also effect timing

what i run in my 53 wont necessary work safely in your 53, as Jon said learn to understand what your motor is calling for. It will shock you on what it really likes vs what others talk about.

a heads up for your meth tuning......get your AFR set with modest timing [enough timing where it shows up on the strap yet but not enough were your dangerous, remember too low timing will melt shit down as well. EGTs are high cause of low timing] then figure out amount of meth you would like to add into the equation.

example.......12psi here no meth 15* i shoot for 11.55 AFR [+/- .15] now for a modest tune with meth on 12psi ill shoot for 11.2 [+/- .15] with 18.5* then you can have a track tune were it at 12psi with a AFR of 10.8 [+/- .15] you can run the rule of .5* per psi, this will net you around 22-24*. when doing things like this make sure your IAT deduction table is aggressive in pulling timing you will not want a high IAT with this kind of tune up, you will also not want a high ECT either. Now there are adders in the software where if you do hit your set point of IAT or ECT you can have the computer add fuel to the tune to save grace.

with ^^^^ this being said if for some reason the meth fails then youll tune will be back were it once was, since youre additional fuel was added by the meth and nothing really pulled from the Ve table. Do NOT pull fuel from the VE table and lean out AFR to desired AFR when spraying meth...if meth fails you run a chance of running extremely lean and the pcm can only act so fast by the time it does react your motor already seen the event. Doing it this way will also help if youre pedaling for traction as if you are on and off the throttle the meth pump cant supply the fuel consistent enough were the AFR would be correct thats why you should not remove fuel from the VE table.

great info!! Thanks George!! This info will be vital when I get the meth kit. Ill call Julio when Im ready. What would be a good ballpark figure for a good kit from him? Im thinking $700

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Originally Posted by o2camaross

great info!! Thanks George!! This info will be vital when I get the meth kit. Ill call Julio when Im ready. What would be a good ballpark figure for a good kit from him? Im thinking $700

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depends on what you all need, as he sells you a map sensor if needed.

recently bought a 2 nozzle kit with a 3 gallon cell and extra lenght of line for a car kit and it was right at 700, i believe in 08 i paid high 500s for my kit. safe to say 600 is about right and he only recomends M1 meth to be ran thru his pumps