i agree with denny....i don't think the cam is TOO small, esspecially since you've re-itterated that it's a daily driver. i don't think a bigger cam is going to yeild anywhere near the amount of gain that dyno tuning will do for you. i don't think there is anything "wrong" with the motor, i think there are a few variables that can unlock some power if you decide to not DD it later on, but with a GOOD tune, i don't think you'll see any problems making 420-430 range

 

Yeah thats another story

Thank you Denny

 

Keep listening (espically to Denny and Bret), they know what their talking about. IMO, throw out that whole flywheel conversion crap, don’t expect your typical hydraulic (daily diver) cam 383ci LTx motor to make 450 rwhp, #s get a lot higher in cyberspace than they do in the real world, your probably losing 10-15rwhp with the intake, some more w/ the heads (but I personally won’t spend the extra money or time porting them), your cam isn’t too small for your needs and shouldn’t have any surge, you really need to get the tune (a/f ratio and timing) dialed in.

Also, some things for people to think about. My old 350ci H&C setup made 393rwhp, with stock LT4 28lb injectors, stock fuel pump, stock LT4 intake, stock 48mm TB, and had very good driveability with a CC EX 236/242, .555/.575 grind.
My current H&C setup initially made 380rwhp using the old (393rwhp) H&C tune as a baseline. After a couple of hours of dyno tuning (by an excellent tuner) it peaked at 418rwhp.

 

What's the total advance at WOT during the pulls? That's all that's relative to the dyno sheets.

Bret

 

I don't know the advance at WOT. I will look at it. You said that 27 - 29* advance is low for my cam. Do you know thats my idle advance? Or did you think at WOT ?

 

I have a crazy surge!! I MUST press the clucth pedal at low speeds to prevent crazy shaking!

 

That definitely should not be happening with a 240/246dur. ~575lift 112.7lsa
cam in a 383ci motor...

 

Your timing tables will be in the tuning program file under the ignition tab. There will be two timing tables under load vs advance. 400 rpm to 4000 rpm and over 4000 rpm. Don't screw with the load vs temp or any other tables, just those two

Open each table, hit control/print screen and it will save it as a picture. Post the timing table pictures along with your dyno sheet and I'll compare it with some of the tunes I have of of somewhat similiar modded engines. Have several in my database that I can compare it to including one done my MTI that a lot of people use.

Cam surge can be tuned out to certain degree by driving, scanning and taking notes. Personally perfer a TechII but that may be a little hard for to get to use one as they're a little pricy. You then go back and try to correct the rpm and KPA the surge is occuring by playing with the timing or fuel/air at that particular point. You will get a little surge from that much cam, but my current 245/248 cam with .630 lift on a 112 drives very, very good. But I've also been dicking with the car for years.

 

Denny your private message quota is full.

 

I think sooo!!
But I talked some people and they said, with A4 trans there is no problem like that. (shaking like a horse at low rpm and speeds)

 

My 222/230 (350 c/i) cam has a ****load of cam surge too. I guess I need to find a better tuner.

 

It's clean now.

 

You definitely shouldn't have any surge!

Denny, you say its all about the tuning?

 

Where am I?? Is this the right post??

Hopefully I've got it right this time. Yep, there is a problem in your under 4000 rpm low rpm tuning that would cause it to surge. Too much timing. Hopefully I've sent ya the right stuff to take care of it. If not, just let me know and I'll try and help.

 

Oh my problem is too much timing ? Okay I'm looking for a different computer now lol