no power when turbo is on a real heavy load....?
09-10-2012, 07:52 PM
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no power when turbo is on a real heavy load....? I have been having this issue for about 3 weeks now. I have tried all my tricks but still nothing...here is whats going on. If I put the car in 2nd gear and hammer into it once it hits boost it feels like its blowing out spark..when data logged it runs rich when doing this and it hits like 21lbs of boost when on an 18lb setting. It will also do this if I just floor the car in 3rd gear or early shift into 2nd or 3rd when at WOT. So pretty much anything at a strong load.When I start in first gear at wot and run all the way through shifting at 6300 its fine....no problems. When I start at 75mph in 2nd gear and hammer into it the car runs great. I am running TR7's gapped at .20, 5th gen Camaro coils, and thundervolt plug wires...brand new. On lower boost the car doesnt do this as bad....if i try to run 19-20lbs it does this as soon as it hits max boost no matter what speed I start at. Here is what I have tried to fix the problem...changed coils, tried tr7's gapped at .25, bought new plug wires, checked all vaccum lines and changed trans fluid thinking it could have been converter (still might be?) I am running the following:
LQ9
LS3 heads
LS9 cam
91mm Turbonetics turbo
newgen wastegate
120lb fic injectors
TH400
3.25 gears
new dual trickflow .660lift springs
AEM tru-boost boost controller
LQ9
LS3 heads
LS9 cam
91mm Turbonetics turbo
newgen wastegate
120lb fic injectors
TH400
3.25 gears
new dual trickflow .660lift springs
AEM tru-boost boost controller
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09-11-2012, 08:30 AM
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No it is not flat until around 4500 and up or so. It has more timing in it down low to help spool and it has 17 instead of 16. And when it happens it is going rich vs when it doesnt do it it is spot on. So has me thinking it is floating the valves. Because it really only does it on high boost high load situations.
09-11-2012, 10:31 AM
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Thanks for the input guys "jkalwei" is my tuner ^^. He is going to try something different with the tune tonight but I think its going to valve springs too. We will see.
09-11-2012, 11:33 AM
#13
To spool better, you want to retard the timing, not advance it. Retarding it puts more heat in the exhaust (although its hard on exhaust valves) and spools the turbine (turbine is spooled primarily by heat). I doubt its spark because a misfire will read lean, not rich. Although if it was blowing out the spark it would show only slightly lean.. I also doubt its valves because its a low-rpm problem, not a high-rpm issues from what I understand.
Last edited by Atomic; 09-12-2012 at 12:01 PM.
09-11-2012, 12:19 PM
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To spool better, you want to retard the timing, not advance it. Retarding it puts more heat in the exhaust (although its hard on exhaust valves) and spools the turbine (turbine is spooled primarily by heat). I doubt its spark because a misfire will read lean, not rich. I also doubt its valves because its a low-rpm problem, not a high-rpm issues from what I understand.
09-11-2012, 03:56 PM
#17
You realize it doest matter right? Heat spools the turbo. Fact. The more heat you put into it the faster it will spool....that is not to say the car will feel faster since you are actually loosing heat out of the exhaust that would otherwise be consumed in the power stroke, but the turbo will most definitely spool faster. Which is why you want to take out timing to spool, then put it back in once you get into boost.
09-11-2012, 04:34 PM
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You realize it doest matter right? Heat spools the turbo. Fact. The more heat you put into it the faster it will spool....that is not to say the car will feel faster since you are actually loosing heat out of the exhaust that would otherwise be consumed in the power stroke, but the turbo will most definitely spool faster. Which is why you want to take out timing to spool, then put it back in once you get into boost.
09-11-2012, 07:57 PM
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There are two schools of thought on it. Heat vs. Pressure. Advancing the timing creates more combustion pressure, making more power, and increasing the amount of exhaust fow, although exhaust heat is reduced.
Retarding the timing will put the combustion event later and reduce the amount of energy transferred to the piston as more heat escapes into the exhaust, but at a lower pressure.
I am with the school of thought of adding timing.... BUT, I lean out the afr's in lower boost to add heat to exhaust flow...
Retarding the timing will put the combustion event later and reduce the amount of energy transferred to the piston as more heat escapes into the exhaust, but at a lower pressure.
I am with the school of thought of adding timing.... BUT, I lean out the afr's in lower boost to add heat to exhaust flow...