253.9 hp at 4600rpm and 310.5 tq at 3200rpm

the graph broke up after 5k really bad.

I think it may be ignition related but i wanted to get some opinions. what rpm are most lt1's peak hp and tq.
My car has been a little rough at part throttle. thanks for any help

 

can you post a link to the graph? Or email it to me and I'll post it for you. Without seeing it, it's hard to say what's going on, but usually if it starts breaking up after 5K you could either have ignition problems (wires, plugs or opti), or you could be getting knock retard (possibly false). With it being rough at part throttle, my bet would be ignition problems. What is your mileage, and when were the plugs/wires last changed?

 

I will hook my scanner up tomorrow and try to send them to you.
my car has 100k. the plugs and wires were changed last May.

autolite 106 & taylor wires

also my car was running 215 degrees on the dyno/it runs 170 on the street as long as i am moving. need a switch or programming.
i also have l the lt4 knock module

 

Ported MAF, perhaps?

 

i have had a problem with oxygen sensers dying on me. it has been a week and my car has developed a bad miss though out all rpms. i have a feeling its the opti but why would i have such a problem with the sensers.

 

with bad sensors the cat usually will follow...

and the cat u will feel in all rpm ranges... perhaps u should look into this...

 

looks about right,all ya really have is a catback powerwise

 

Mine was breaking up above 5K and it turned out to be valve float. Very possible with so many miles in a case like yours. Stock valvesprings are a little weak even when new.

 

I don't have a cat but i am definite that it is ignition related. with the sensors i didn't miss at wot. now it misses all the time. I am fixing to do headers and cam so I will just do the whole works i guess

 

those numbers sound about right for a A4.
my guess would be optispark.
and get rid of that cat if you can. its probably clogged after 100,000 miles

jesse