brokeTA

The car idles just fine. Starts up just fine. There is nothing mechanically wrong at all. I am thinking an injector problem myself. The car seems to load up when idleing. When you hit the throttle quickly at first it seems to cutout, but after doing this it clears up and is fine. Would also explain the erratic cruising at 2500-3000. There is no exhaust leaks that I'm aware of, but is something to look into. The car is not using the o2's and is a speed density tune as well. Rockers are adjusted to 1/4 turn. Also stock lifters. Another point to make as well.... The intake is not ported in anyway, and is also using stock throttle body. To me this is a slight restriction on a heavily ported head (at least the intake).

SStrokerAce

THE ROCKERS NEED TO BE AT 1/8TH OR LESS!, I've said that before. It's not going to find the lost power, but it will work as designed then.

Bret

Hark_z

Unfortunately the car would not start today. It kicked over for awhile and it wouldnt start. White smoke started coming out of the hood and underneath the car. I opened the hood and couldnt tell exactly where it was coming from but it looked to be down where the CAI is. I gave it a few more tries then it eventually started and was fine, which was weird. The exhaust fumes smell of gas badly. I've also noticed the longer Ive driven the car the more it backfires, even at WOT it is popping profusely and holding back . Sorry Andy and Tim not whining about the car, just describing the symptoms.

brokeTA

Bring it back and we can check it out. We can re-adjust the rockers as well.

mad scientist

How could an exhaust leak well downstream of my wideband effect the tune? It cannot, plain and simple. Other than that, I agree with you. The cam and heads are really nice. This setup will be worth the trouble once it's finished. I know the tune is not bad. Recalibrating automotive computers IS my full time job and I'm really good at it. There are a few obvious mismatches, like Andy pointed out. I'll add a few....
Injectors
intake
throttle body
lower end
compression ratio
tq converter stall speed
rear tires


The lower end will not survive at the rpm that combo will need to be shifted at. Street tires are not going to hook up in first gear from a dead stop. 11.5-12.3:1 CR would be ideal for the H/C. I have tuned quite a few LT1's in that CR range. Every one ran great on pump gas. The stock intake and TB is not going to cut it. The injectors are at 50-60% DC. That means the injectors are too big. I really think a 4000-4500rpm stall would produce the best ET's at the track unless the CI was increased.

If there is something wrong with the install or tune, Redline and I will find it. Nobody is perfect and a mistake could of been made. Really doubt it though. Hang in there Hark_z. Once the issues you are having are resolved, it will be worth it.

speed_demon24

When he said redline did the instal I guess I automatically thought it was the redline thats 20 minutes from my house. I guess I shouldn't post drunk.

razor02097

If the performance is getting worse and there is a fuel smell its usually a sign of a fouling plug or shorting plug wires. Check em again

Hark_z

I've spoken with them and I'm going to be dropping the car off soon in the next few days. Going to try and test the car with the stock injectors, rotate rockers etc., see what we can figure out.

Bret: What size stall do you recommend with this setup??

Hark_z

Even though the plugs are brand new and the wires only have a few thousand miles on them, its def a possibility.

marshall93z

Not Bret, but yours should be plenty.

Denny McLain

I do it all the time. Great sport in my opinion.

As Mad Science pointed out, the combo is a little ruff being a mismatch of parts with a few weak areas. You have to find what's restricting hp and certainly the TB and intake would be my first place to start after tuning.

Compression was brought up and I've ran as high as 13.3 to 1 on pump gas with no issues. Tight quench and reverse cooling seems to do wonders in terms of being able to run a lot of compression. The only issue I ran into was the car wanted to run a little hotter than I liked and in 100 degree heat it did get a little ping. No ping if it was cooler.

mad scientist

Yeah, for the street. But for max ET's...that is different.

Injuneer

The point I'm trying to make here is that the "topic" of this thread is misleading and derogatory. What was supposed to be a car that sounds awesome and performs will, actually has a lot of problems, like mismatched parts, running rich, PCM cutting out, etc. Its misleading and irresponsible to trash the heads and cam - mentioning the cam designer's name - while failing to mention all the other things that are contributing to the problem.

Hark_z

Don't know what else I can say..

SStrokerAce

Poping could be loose rockers, i've seen that be the case before.

Yes a exhaust leak ANYPLACE can cause issues with sensors. The gas in the exhaust system doesn't just flow out to the tailpipe, it also travels in waves back towards the chamber. When you have issues with LT headers in 2000-3000rpm it can easily be exhaust issues. Especially if the car has cats or something very restrictive for an exhaust, not to mention a pin hole exhaust leak is about your worst nightmare in terms of losing power for no reason. a 30" x 1.75" OD primary has very bad wave tuning in that RPM range so it is causing issues there, especially if it's rich it's going crazy maybe even pushing unburnt fuel back into the chamber and causing these issues. It can happen.

As for a stall for a street car, a 3000-3400 is what that is designed around. Beleive me it will make more TQ than any other cam thru that RPM range. More converter will make for better ET's, and so would more compression but it's not as durable. The only way you were going to get more compression is a thinner head gasket or milling the heads, AGAIN. Those things have been milled enough already.

Bret