i have a 92 firebird conv with an lo3. it's completly stock except for an open element air cleaner, and now an lt1 cam
what do i have to tune to make an lt1 cam work. I have the cam in now and it runs like ****!! Almost stalls at every stop, i may have timing off as well. What else do i need to do. (i should have researched more before i threw this cam in)

 

Get some tuning stuff for your car, check out the DIY tuning section for more info on this. I'd recommend getting the EBL setup. You may as a bandaid for now be able to bump the fuel pressure up a bit but I wouldn't want to run around too long like that.

 

I know that not many tuners like this idea, but you can get a tbichips.com lt1 chip.
He, I believe did the same thing, and its got it running good.
That would probably be a good bandaid, and if it runs fine you can just keep it.
THe fuel preassure regulator thats adjustable runs around 65 bucks (unless you wanna make your own). In which case with about 20 more buck you can have yourself a chip that will keep the car decent, if not good!

Good luck, and if you feel up to the challenge check out Megasquirt, or Rbobs boards for tuning.

Laters.

 

Aww man, you should have read the LT1 cam digest above.

Hey, atleast you got it in. You can get one of those tbichips.com chips but anybody doing a mail order (even pros on this website) is bound to mess up a few times before getting it right. it will probably run on the first one, but don't expect to get the full potential out of it on your first try. it will take alot of tries (and alot of money) if you do the mail order thing. If you do it yourself it is alot harder to learn at first but alot cheaper and funner too.

 

For the cost of the mail order garbage you can have all the burning equipment from Moates.net. You looking at around 125 for the burner, adapters and chip, just supply laptop and the willingness to learn.

 

...........and also you said that the timing may be off. Go back and check things over and try and make sure that all the basic things have been checked.

http://www.moates.net/product_info.php?products_id=48

Check out the burner and his other products. They work well.

The lack of a laptop held me back for years but in hindsite a very cheap used one with an inverter in the car will work well.

 

i got it running a little better, the car isnt shaking as bad, but the timing still jumps when the distributor is hooked to the ecm. I checked all the wires they seem to be fine. I'll pull the plugs out and test them for spark next. I might check into that tbi chip, it sounds interesting at least a bandaid till i put on the tune port i have sitting in my garage. theni im getting into tuning.

 

I doubt there is anything wrong with your car other than the tune. With an LT1 cam my car wouldn't even get out of the driveway. Chip work is job 1 with these cars.

 

im riping this piece of **** out tonight! It goes though gas like hell. It made it knock and everytime i came to a stop the car would die unless i gave it some gas. What a piece of crap. All that time for nothing. Word of advice dont make your daily driver and only car a hot rod..

 

You need chip work. That is the solution. I know you are frustrated but there is an answer to your problem.

 

alright, how much will the tbi chip help out will it still eat gas at 3mpg? and stall when the rpms go below 700?

 

When you put the cam in, did you just put it in without touching the fuel pressure?

Then you bumped up the fuel pressure and it ran worse??

My car ran decent with a VAFPR and LT1 cam on a stock tune, it would never die, but the idle would surge/seek a decent amount and WOT was nothing spectacular, luckily the BLM correction made the part throttle very liveable. I'd say either get someone in your area to burn you a chip or get the TBI chips chip then dive into prom burning for yourself. It just seems like you need such a drastic change that slowly getting into it now would **** you off more than buying a chip off someone then learning from their experience.

 

im taking it down south to ft myers, fl to a friend, he has all the burning and reading capabilities
----------
does anyone have a bin file for a 92 tbi lo3 with an lt1 cam?? that whould give me a good platform to start with.

 

Are you still a 700-R4 combo? Need emissions? Full Exhaust car? There's a lot more to it than "LO3 + LT1 Cam"

 

It has stock everything, emissions, stock exhaust, stock everything, just an lt1 cam

 

My bin doesn't have emissions and is for a car that's a little more warmed over, otherwise I'd send you mine. I had to play with the low end timing and fuel a lot to get it to behave well. WOT didn't require too much change since it's rich from the factory to begin with.

 

my car is also running very rich at idle, its pumps out thick black smoke, any idea what this is due to? I had heard that you raise the fuel pressure when you add an lt1 cam, i never did that and its running rough and rich.. hmmm... also about the bin file, maybe this means its time to clean up the engine bay and remove all that emissions stuff..

 

Your running rich because your engine is pulling less vaccume and your ECM is now running in a different part of your fuel tables. When ever you change how an engine runs with a speed density type fuel injectin system you HAVE TO retune the fuel tables, no way around it. The whole theory of speed density is bases on taking an RPM reading, a manifold vaccume reading and then referenceing a table that tells how much air is going into the engine (also called VE or volumetric efficency) at that particular rpm and MAP reading. If you change anything that table will no longer match up with how much air is actually going into the engine.

Your case is typical in that your cam pulls less air in at idle, hence the richnes. But becarefull because now it will pull in more air at high rpm's so you'll be lean up there. So a simple fuel pressure change isn't going to "fix" it. You need to tune the chip for your combo, mail order won't cut it. Check out the "come in for a free tune" thread at the top of the forum. I may be able to help if your willing to learn.

 

thats the kind of information i am looking for. Thanks! I taking it to a friend have it tuned up on sunday. I sounds like there are alot of people who have done this mod only with this engine, somebody has to have a bin that is similar.. Something i can start with and tune from.