Got tuned!
We did hook up a fuel pressure guage for one run and it went from 44psi to about 63ish and held steady.
I'm going to do some researchfor new computers, a local guy has an old fast system off his lt1 he has no use for.
Formula350, i'll have to check out your thread.
I have never really thought of it but since valve springs were mentioned, my heads were bought from Scoggin Dickey and they are just stage 2 cnc ported lt4's so they very well could be stock lt4 springs?
My cam is 216/222 .560 114lsa. Speed Inc built my long block and spec'd out my cam.
I have made other dyno pulls on lower boost and the graph never did anything abnormal like this?
I'm going to do some researchfor new computers, a local guy has an old fast system off his lt1 he has no use for.
Formula350, i'll have to check out your thread.
I have never really thought of it but since valve springs were mentioned, my heads were bought from Scoggin Dickey and they are just stage 2 cnc ported lt4's so they very well could be stock lt4 springs?
My cam is 216/222 .560 114lsa. Speed Inc built my long block and spec'd out my cam.
I have made other dyno pulls on lower boost and the graph never did anything abnormal like this?
What makes you think its a fuel problem? Did the afr go lean when that problem happened? From you dyno graph the afr didn't jump or anything weird. Im putting another vote in for valve springs it looks like valve float.
TECH Senior Member
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From: Decatur, TN (N-W of Athens)
If he can get the GEN III PCM running on his like the guys in the thread I posted, he should be MORE then set!
That isn't the air fuel at the bottom, its speed. The tuner had the dyno wideband plugged into his stuff so it isn't on the readout. He said the pull is still pretty far on the fat side until it feaks out and goes really rich then spikes lean after that. How far I don't know.
As for my ignition the opti probably has less than 10,000 miles and the wires and coil have a little more. The ICM has never been replaced to my knowledge. Spark plugs are brand new tr6's gapped @ .032
As for my ignition the opti probably has less than 10,000 miles and the wires and coil have a little more. The ICM has never been replaced to my knowledge. Spark plugs are brand new tr6's gapped @ .032
I have never really thought of it but since valve springs were mentioned, my heads were bought from Scoggin Dickey and they are just stage 2 cnc ported lt4's so they very well could be stock lt4 springs?
My cam is 216/222 .560 114lsa. Speed Inc built my long block and spec'd out my cam.
My cam is 216/222 .560 114lsa. Speed Inc built my long block and spec'd out my cam.
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Verdad Gallardo You would think they would have done this before if thats the case? Any way to tell just by popping off a valve cover and looking at them?
I wonder if it would help to close the gap a little on the plugs? Maybe the spark is blowing out?
I wonder if it would help to close the gap a little on the plugs? Maybe the spark is blowing out?
I would suggest a NGK TR8 at this level. The springs should also be checked to make sure they are sufficient for the cam.
looks like it has a lot of potential as you sit now with this issues
Opti you noted 10,000 miles, but how old is it?
looks like it has a lot of potential as you sit now with this issues
Opti you noted 10,000 miles, but how old is it?
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From: Decatur, TN (N-W of Athens)
I thought NGKs were cooler as the numbers went up. I'm just going off of "You should run a colder plug like a TR6 if you plan to spray", as opposed to running TR55s normally. *shrug*