crAzy95z28

so what would yall expect?

FastZinTennessee

I'm confused on this knock sensor issue. Are you saying your knock sensor is bad (sensor on the block), or are you saying you will be replacing the knock module (in the PCM) with one from an LT4??

crAzy95z28

the knock sensor was bad on the block! I have the LT4 KM in the pcm and the knock sensor was causing some topend power loss.

FastZinTennessee

How do you know the sensor was bad? Did you test it with a meter? Did you put some race fuel in the tank and it did not change your knock count??

crAzy95z28

was throwing a code, scanned it, replaced it, code went away, now gotta take it back to dyno and see if i pick up any hp.

but the weird thing now. was that the ses was on all the time. Now after replacing sensor it goes away during driving, but comes on sometimes at a stop/idle. Then goes away again during accelration. Going to have it scanned again when i take the car back to the shop to fix my oil pump driveshaft.

vin1382

agreed. cam is too big for the stock heads also. I think for the setup, the numbers are pretty close.

Sweetred95ta

I don't think the numbers are right. Look at altjar (sp?). Stock heads with a gm847,which is pretty similar to his cam, and he made like 350-360 at the wheels. The dyno chart looks good and it is peaking around where it should, but the fuel makes a huge difference. I picked up 30rwhp just getting the fuel maps right. Then, you can start playing with the timing. Go get it dynoed again with the a/f ratio displayed and go from there. Don't get discouraged.

cndctrdj

my thought it that your intake is holding you back, way back. i gained almost ten hp with my cai. when your car with that huge cam is asking for way way way more air than my stock stuff so i think that you will see a massive difference with one.

crAzy95z28

i know but as mentioned above there was a guy who made 350-360 with a gm847 cam with stock heads,intake,tb and i know it was m6, but i am still looking for at least 330-350!

turbo_Z

At what RPM? I think it would be higher than 6500 rpm and your graph falls off after 6200 rpm. Could be your rockers are set too tight.

ABA383

You are asking the motor to do a lot with a big cam and no way to breathe for it with stock heads. Add to that an A4 and your numbers will be lower than you'd expect. Don't get to bogged down in dyno #s...Get the a/f ratio right, timing, etc and run it at the track and let the track tell your trap speed tell whats going on...Dynos are great for tuning but don't get too hung up on who's making what...

I suspect that once you get some heads to match that cam you'll see a huge difference. You're asking a big pump (cam) to move air through a swizzle stick of a straw with those stock heads...

--Alan

clemsb4c

Locking the converter is really hard on your converter I don't know what kind of converter but I would be careful about locking it up alot. Many are not really built strong enough to lock up a WOT.

crAzy95z28

this could be true. I do have the True LT4 rockers 1.6 ratio. They bolt down without a poly lock nut.

ill have my mechanic take a look at them and make sure they are not set too tight.

i know they are suppose to be what 18 pounds trqed?

also do you think having the roller rockers too tight would throw a code? I mean the car drives great.

vin1382

do you have an electic water pump? pulleys? cats?
your stock intake(assuming a CAI) is going to hold you back, as is a stock TB for bolt-ons. all that there is about 15-20 hp.

Sweetred95ta

Not necessarily. I have a Joe O. cam which is "similar" to the gm847 and it doesn't pull past 6500. When I looked at his graph, I saw that it leveled about 6200-6300 rpm. It's not going to pull any higher with stock heads. But, the numbers he is making are less than the numbers I made with a hotcam. It should make more hp and tq than that. Period. I think that you need to get the a/f ratio checked out. Then go from there. And, when talking about the rockers being too tight, their not talking about the torque specs, their talking about tightening them to zero lash. Just spin the pushrod and tighten the rocker until the push rod starts to grab. Then go 1/4 to 1/2 turn more and lock them. Get back to the dyno.