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going to need a lot more details to help you out. like
cam
heads
turbos
boost level
fuel
trans
just to help at all. thanks.
thunder racing comp cams 224/224 112 lsa
ls2, afr 225 72cc
aps twin turbo(mitsubishi td06-20g)
this dyno was on 14 psi wastegate spring
91 pump gas, 80lb injectors 450lph in-tank pump http://www.racetronix.biz/itemdesc.a...000267&eq=&Tp=
built 4l60 with precision or yank converter, cant remember which one
im not saying its the issue but 14 psi and 16* timing is fairly aggressive for 91 pumpgas. that is unless your iat's are very cool. id say drop timing and see if it likes it you might be getting some detonation.
I lot of guys have gotten away with more but not every combo is the same.
im not saying its the issue but 14 psi and 16* timing is fairly aggressive for 91 pumpgas. that is unless your iat's are very cool. id say drop timing and see if it likes it you might be getting some detonation.
I lot of guys have gotten away with more but not every combo is the same.
iat's are great, has custom built intercooler with 6" core
Valve float, high back pressure from those small turbos can cause this if you dont have a heavy enough valve spring, also check plug gaps are tight , around 20" thou
what boost controller? It looks like you hit the boost warning/control setting on a profec-B spec-II (or similar) dropping boost suddenly to some preset level.
usually, use SMOOTHING=0 for diagnosis. The "5" setting is for showing off the curve, it may mask issues with the engine.
Also an AF curve would be nice. but overall it just looks to be regulated, purposefully, you kind of see a little spike right before it occurs, which further emphasis on the control aspect.
Valve float, high back pressure from those small turbos can cause this if you dont have a heavy enough valve spring, also check plug gaps are tight , around 20" thou
what boost controller? It looks like you hit the boost warning/control setting on a profec-B spec-II (or similar) dropping boost suddenly to some preset level.
usually, use SMOOTHING=0 for diagnosis. The "5" setting is for showing off the curve, it may mask issues with the engine.
Also an AF curve would be nice. but overall it just looks to be regulated, purposefully, you kind of see a little spike right before it occurs, which further emphasis on the control aspect.
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