Ive been looking at doing a 383. Will it be able to pass the smiffer with a stock 350 chip? Or am I better off building a 350?

I havnt picked out a cam yet If somone know if a good one that will pass emissions and work well with the tpi that would be great.

The rotating assembly im thinking about going with is an eagle cast crank, 6 inch forged i beam rods, and forged j and e pistons. The CR with 64 cc heads will be 9.8 to 1.

Not sure on the heads was going to do afr but the jegs guy said they are 3 months behind.

 

With Speed Density? No. You'll need to tune the chip. Once tuned, you should pass with flying colors. People over here are easily passing New Jersey inspection without even runnin EGR's, all through tuning. Just take it easy on you're cam selection...

Off topic: You have a very clean Camaro there, and you're TPI transition looked to go very smooth. Excellent job. About those Dominion heads though, were they your's? If so, WHY did you sell them?

383 + Dominion Heads + HSR = DEATH!!!!

 

On my 383 LPE219 SR and TF heads I passed with just a Cat. No smog or egr.

 

There is a guy around here that passed with a 383 LT1 with a GM 847 cam (232/242 I think).

 

My Super Rammed 383 passes NJ Inspection with a custom chip cleaner than the day the car was new.

Street_Lethal are you on njfboa.org yet? If not check it out.

 

I just joined.

 

The Dominion heads were a friend of mine they were for an lt1. He desided it was to much work to get custom headers and intake to make them work for his car so he sold them off. I thought they looked cool so I left them up on the sight for people to see.

How bad will the 383 run on the 350 chip? If its not going to run I might be better of doing a 350 that way i dont have to fight with a tune.

 

Build the 383 and get a chip.....the low cost of a chip justifies the increased displacement trust me.

StreetLethal.....FYI my name on njfboa is HardcoreZ28

 

sorry to tap into this thread but when doing a 383, or a 400 swap will the car at least START on the stock chip? idle like ****, and fall on it's face is fine, but would it start??

Josh

 

I'm not a complete expert but I'd say if it's a MAF car it should start and just run bad. SD might have some issues staying running or starting at all.

 

Were do u recomend getting a chip from? I have 24 pound lt1 injectors that had just come back from the cleaners will thoughs work ok?

 

That is a nasty issue. Once and a while a guy on these boards might burn you a chip to get you started, for a small fee. What usually happens though is that you will end up paying some guy around $100 for the first chip, then every chip after that is "X" amount. A lot of chip guys who do chips won't even touch an engine that has been modded quite a bit. IE a 383 with ___ and ___. So the best bet is to start learning now on what engine you have.

 

I don't know if LT1 injectors fit our wiring harnesses, somebody else might know. As far as chips....if you're going to go mail order then I think PCMForLess is supposed to be pretty good. After that I'd find someone near you to do a better tune in person if you want any tweeks and such.

 

LT1 and LS1 injectors fit our harness' fine, trust me, I have run both.

 

If you have a Maf and stock injectors any size cubic inch motor will start right up and run fine considering the timing is stock and also valves are adjusted right. Once you mess with injectors then you need a chip. If you get 30lbs injectors and have a chip burned to stock specs but the constant at 30 the car will run fine.

 

Probably the biggest factor in building a narrow band O2 engine that will pass emissions is your cam selection. This is especially true if you also have headers. Headers increase scavenging and so does a cam with a tight LSA. The problem is that too much scavenging, while great for horsepower, results in an overly rich mixture when in closed loop. The sniffer tests are done at low power settings when your engine is in closed loop.

The rich mixture is because of the following:
Scavenging draws air into the intake during the exhaust/intake overlap period. Unfortunately, some of the intake air is also drawn into the exhaust when this happens. The fresh air in the exhaust presents itself to the O2 sensor as a lean mixture (because there's too much unburned oxygen). The ECM increases the fuel flow until the 'apparent' mixture is again 14.7:1. In effect, the engine is now running too rich but the ECM thinks everything is fine.

Use a cam with no less than 114 degrees of lobe seperation or change your system to a fulltime wideband (costly). Unfortunately you can't make tons of horsepower, have great fuel economy, and pass emissions testing with a narrow band O2 system.

 

dont stick with a 114. Its possible to go lower then that. Heck. Mines 112 and passes with flying colors and also the 85 305 TPI'S came with something like 110 or 109

 

You read my mind. I believe that Capt. Picards Z28 has a 110 or 108 and is said to run very good on it.