more boost or timing?
Thread Starter
single digit dreamer
iTrader: (6)
Joined: Mar 2002
Posts: 9,757
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From: omaha ne
more boost or timing? tonight i found the limit of pump gas, got up to 11.5psi and saw(and heard) some knock, i got out of it right away. bumbed it back down to 10.5psi and made a run and no knock at all. i am seeing about 16deg of timing too.
now my question is am i at a good spot, should i just stick with 10.5psi and 16deg or try less timing and more boost?
i am also prety rich, about 11-1 a/f ratio and am seeing 60lb/hr of air. this is on a camed 6.0 with a t76.
anything i should try or just call it good right there?
now my question is am i at a good spot, should i just stick with 10.5psi and 16deg or try less timing and more boost?
i am also prety rich, about 11-1 a/f ratio and am seeing 60lb/hr of air. this is on a camed 6.0 with a t76.
anything i should try or just call it good right there?
if you are that rich i woudl think you could pull off the timing a bit and add a soem more pressure to it. i wouldn't suggest going nuts or anything, but taking it to about 12-13 degrees of timing and hitting about 13psi shoudl work.
have you tried maybe a range or two cooler on the plugs with the 11.5psi? may a little cooler plug will allow you to keeep the timing and the pressure.
later
tim
have you tried maybe a range or two cooler on the plugs with the 11.5psi? may a little cooler plug will allow you to keeep the timing and the pressure.
later
tim
Teching In
Joined: Apr 2004
Posts: 19
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i would recomend running a ngk plug. is your head tapered seats(if it is not a tapered seat a great plug is ngk stk#7173 and 7405 that is a eight and a nine heat range)? close the gap on the plugs a little it will help. what kind of ignition do you run
what kind of engine management do you run?
what kind of engine management do you run?
Thread Starter
single digit dreamer
iTrader: (6)
Joined: Mar 2002
Posts: 9,757
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From: omaha ne
static is 9.4-1 but i have a prety big cam(232/230 595/590 114+1) and my turbo guy is telling me my dynamic compresion ratio is more like 8-1, the best pump gas is 92 here.
as for those other questions it is a prety much stock 6.0 but with a cam, i have whatever seats come in stock heads, i have the stock ingnition and factory pcm with edit/efilive/wbo tuning.
i have the stock maf tables in there, when does that sensor max out? i still have the STOCK factory exhaust that came with the 4.8 on there, single 2.5" and very quiet. i am going with a cut out here in a day or so. with that in mind i may be flatlining that maf sensor so more boost may not be an option without having to get fancy with the tuning.
as for those other questions it is a prety much stock 6.0 but with a cam, i have whatever seats come in stock heads, i have the stock ingnition and factory pcm with edit/efilive/wbo tuning.
i have the stock maf tables in there, when does that sensor max out? i still have the STOCK factory exhaust that came with the 4.8 on there, single 2.5" and very quiet. i am going with a cut out here in a day or so. with that in mind i may be flatlining that maf sensor so more boost may not be an option without having to get fancy with the tuning.
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wel obviously you will want to log maf HZ and see if you are topping it out. but in that case it would be changing your a/f
11psi i'd say is 'close' to as much as you can go on pump wiht 9.4 cr
are you using edit? what is your intercooling method and iat's
i have had my tune so screwed up before that i would be getting knock with 13* timing and 10.5 a/f ratio.. then i would start back at square one and have no knock with 25* and 11.5 a/f at the same boost level. i dont know if thats happened to anyone else before but i think there is a time when you can be TOO safe and have it create more problems than it prevents.
not owning or being financially involved with the set up i can safely suggest you start over with a new file and shoot for a mid 11 afr and move the timing up to 23-24 degrees at max rpm and up to 20 or so at peak torque
11psi i'd say is 'close' to as much as you can go on pump wiht 9.4 cr
are you using edit? what is your intercooling method and iat's
i have had my tune so screwed up before that i would be getting knock with 13* timing and 10.5 a/f ratio.. then i would start back at square one and have no knock with 25* and 11.5 a/f at the same boost level. i dont know if thats happened to anyone else before but i think there is a time when you can be TOO safe and have it create more problems than it prevents.
not owning or being financially involved with the set up i can safely suggest you start over with a new file and shoot for a mid 11 afr and move the timing up to 23-24 degrees at max rpm and up to 20 or so at peak torque
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11-11.5:1 AF at WOT is pretty ideal and safe, if you go too lean you have no margin for error.
Timing makes power but if your intercooling system is maxed out then you can't do anything.
Are you running a colder plug? What intercooler? What IAT temps at the top of a pull?
Timing makes power but if your intercooling system is maxed out then you can't do anything.
Are you running a colder plug? What intercooler? What IAT temps at the top of a pull?
Thread Starter
single digit dreamer
iTrader: (6)
Joined: Mar 2002
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From: omaha ne
running tr6's
here is a recent log and a pic and a vid if you feel like waiting > http://www.neneons.org/vids/silverturbovid.wmv
here is a recent log and a pic and a vid if you feel like waiting > http://www.neneons.org/vids/silverturbovid.wmv
Teching In
Joined: Apr 2004
Posts: 19
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man i love turbos your kit looks beautiful.
i know my car is way different but i agree with mightymouse i think your timing should be alot more at that low of a boost level i looked at my map and i am running 27 degrees @ 12 psi and 20 degrees @ 31 psi
more timing and like a 11.5 11.9 in your peak torque will help the car alot.
i know my car is way different but i agree with mightymouse i think your timing should be alot more at that low of a boost level i looked at my map and i am running 27 degrees @ 12 psi and 20 degrees @ 31 psi
more timing and like a 11.5 11.9 in your peak torque will help the car alot.
TECH Apprentice
Joined: Jan 2004
Posts: 337
Likes: 0
From: Frisco TX (Dallas Area)
Lower boost and more timing on the pump gas is the best way to go. Maximize timing (I'm guessing around 28°) and add enough boost to get just below KR. Then add higher octane and add boost to match. You'll do better over all. This is turbo Buick conventional wisdom. Of course, LS1 guys with different experience might differ! HTH 
TECH Resident
Joined: Aug 2003
Posts: 948
Likes: 0
From: orlando, florida
I agree with MM if your tune is off the car can detonate with little to no timing. I'm running similar compression 9.4:1 with 10psi my timing is 18* @ tq peak and 20* at 6000rpm. @ 12psi i was still able to run 16*timing at tq peak and 19 @ 6000rpm. Keep in mind i'm still runing the tiny 60-1 turbo which is dumping alot more heat into my intake. Another thing is you could of gotten false knock. Was it consistent and at what rpm?
Thread Starter
single digit dreamer
iTrader: (6)
Joined: Mar 2002
Posts: 9,757
Likes: 4
From: omaha ne
just got back from the dyno, i tried more timing and hell yeah, more timing is better than more boost. here is a link to my dyno post in the truck section if anyone wants to read it. https://ls1tech.com/forums/showthrea...34#post1269734
remember these numbers are thru a 4l80e, tcase and 32" tall tires
remember these numbers are thru a 4l80e, tcase and 32" tall tires
