fast400

iTrader: (1)

Now that I finally got the radiator hoses on, I was able to run a bit longer. After 4-5 minutes of running, the floorpans got really hot...melted a ziplock bag lying on the floor board! Normal???
Feels like a Sauna in the car!
I plan on Dynamating....

jomomma

iTrader: (39)

how close is your exhaust running to the floorboard?

fast400

iTrader: (1)

1 1/2- 2"
The car is running really rich and occasionally backfiring...wonder if that has something to do with it.

Pop N Wood

iTrader: (1)

Yeah, it does. I have a burn on my arm right now to prove it.

Although melting things sounds too hot for dynamat.

fast

iTrader: (24)

exhaust leaks?

jeeperanthony

iTrader: (1)

Another product to try is Lizardskin. Saw it on some show, and seemed real promising.
http://www.lizardskin.com/

fast400

iTrader: (1)

I've retightened all my exhaust connections. No Leaks. The high flow cats actually got soo hot they turned the pipe directly behind them blue.

Jaysz28

iTrader: (19)

well now you know why factory cats have heat shields around them.... they super heat the exhaust, burning the contaminants out of it

I'd seriously consider building some sort of heat shield for the cats, or you are going to have more issues

I'm not running cats, and I can touch my floor board at any time

-jason

Stu Cool

iTrader: (13)

Good idea to put heat shields around the cats, but you also need to get rid of the rich condition. The more unburned fuel getting into the exhaust, the more the Cats will need to "convert" or burn off thus making more heat. If you let that condition continue I think you may risk ruining the Catalytic converters. Any idea why it is running so rich? Do you have the O2 sensors hooked up? Have you done any reprogramming?

Pat

fast400

iTrader: (1)

I have the front 02 sensors installed. As far as the PCM goes, I've deleted unused items, turned off vats...but other than that I haven't done any tuning.
I noticed my FP gauge bouncing around a little bit, anywhere from 40-50psi when I blip the throttle.
I have a new Rick's Tank with pump, new corvette filter regulator. I even pulled the injectors and cleaned them (they're the L59 flex injectors). The engine/injectors only have 400miles on them.
I'm starting to run out of possible causes...

726.0chevelle

iTrader: (17)

you might look on ebay check out fatmat same as dynamat but 1/4 the price thats what i purchased for my car

bczee

iTrader: (12)

What is your engine Temp reading ?... to much advance in the timing or a lean condition in the mixture will also cause excessive heat (I burned up one Cat on my Van running with a lean condition to long). Going the shield route is just a band aid.. you got a problem somewhere else..

Have you tried getting a scanner and see what all of your sensor reading are ?

fast400

iTrader: (1)

The front two sensors are switch high/low as they should. My temp gets to around 190F (180stat installed). The plugs are really rich when I pull them out.
726 Chevelle
"you might look on ebay check out fatmat same as dynamat but 1/4 the price thats what i purchased for my car"
Thanks! I was going to get the dynamat...if I can find something cheaper I'll take it!
__________________

bmxmon

iTrader: (5)

I had bought some of that fatmat a year or so ago after a friend had bought it and recommended it. I paid for it and it never shipped, had to get my money back through paypal. I think they went under. Perhaps somebody else started it up again though.

philntx

iTrader: (8)

You need to determine the cause of the rich condition and correct that.

Then, you should use one of the heat shield products from Thermotec

They have a variety of products that you can use under the car to deflect heat to keep it out of the passenger compartment.

TheBlackPlague

iTrader: (1)

^ Ya im with him about figureing it out. Man all of our cars and most all cars have the exaust an inch or two away from the floor in places with no shielding..

4 things that pop in my head.

1 Timing is somehow way to high and exploding the fuel mixture after it enters the exaust

2 you have some sort of restriction like the cats are stopped up and your just build all the heat up before hand.

3 bent/burned exhaust valves.

4 Your running SO rich its burning the unburned fuel in the exhaust system

Again these are just examples.

76LQ9TA

iTrader: (1)

Did you install larger injectors and not program for them? If so this is why you are running rich.

fast400

iTrader: (1)

It actually has the larger L59 injectors (flex engine). I haven't run for more than 10 minutes at a time. Is it possible the PCM has to learn the mixture first?

Cam72aro

iTrader: (28)

You need to do the IFR table. The Injector flow rate table. Stock injectors are 28lbs, not sure what those are, but they are most likely bigger. The pcm is telling the injectors to open up X amount. If you have an injector that flows more fuel and its opening up the same as the smaller injector, then its going to dump more fuel. You can find a table on here that will help you to get the numbers right, assuming you know what size the injectors are.

fast400

iTrader: (1)

Wouldn't the original tune in the PCM already be set up correctly as far as the injectors go? The PCM has a table for ethanol and gas. It adjusts according to amount of fuel tanked and o2 readings. I'm only running gas currently though.
I've prepped everything in case I want to run ethanol later.