Need a little help turbo guys..
#1
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Need a little help turbo guys..
Ok, I'm working on a 5.3 swapped extreme s10, has an all stock 5.3 just ls6 cam, pushrods, duel valve spring's, has a log manifold front mount turbo, turbo is 78-75 on3 unit, trans is 80e with ptc 3200 converter and a 3.08 gear. Problem is it won't spool to save its own life, check out the video...
That's leaving at 2500 rpm foot brake, does not hit full boost till it shifts into second, note that it go's like 60mph in first gear.
Things iv done...
-tune is good, timing is 29 degrees at 0 boost and 21 at 10psi (e85)
-no leaks, pressure tested cold and hot side
-push rod lenth is .045
-waist gate stays closed
-open exhaust
-no air filter
-bypass air/air
-bov stays closed
-switched out turbo to 70/64, this helped slightly but no were near were it should be.
What am I missing? Only thing I can think of is cam timing, engine has no blow by.
That's leaving at 2500 rpm foot brake, does not hit full boost till it shifts into second, note that it go's like 60mph in first gear.
Things iv done...
-tune is good, timing is 29 degrees at 0 boost and 21 at 10psi (e85)
-no leaks, pressure tested cold and hot side
-push rod lenth is .045
-waist gate stays closed
-open exhaust
-no air filter
-bypass air/air
-bov stays closed
-switched out turbo to 70/64, this helped slightly but no were near were it should be.
What am I missing? Only thing I can think of is cam timing, engine has no blow by.
#9
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The z06 cam in a 5.3 is a pretty lazy cam... It's meant for high rpm power in a high compression 5.7. That likely has more to do with it than you think. You say building cylinder pressure helps build boost... That cam is bad at it. People run much much stronger in larger engines with less cam. The triple 12 being a great example.
In a 5.3 the z06 cam Id bet pulls to 6700 rpm. And it's just fairly lazy but carries power forever.
In a 5.3 the z06 cam Id bet pulls to 6700 rpm. And it's just fairly lazy but carries power forever.