goodrich969

iTrader: (9)

i have a question i took my cat back off and now for some reason my car seems to be getting really hott. like 210+... and when i got gas. when i unscrewed the gas cap. it like hissed and was warm?

1SLO6

iTrader: (8)

so you took off the exhaust from the cat or from the rear section.... havent really noticed i difference in mine when i use my cut out but it is possible because the exhaust is not coolin thru the whole tube rather than just being dumped. He you removed from the rear section that hissing could be due to all the pressure that is being generating from the heat off the exhaust. Only input i have but hopefully it will give you an answer. If when installed normally it cools fine than u got no problems....

got V-8?

iTrader: (1)

I'll chime in on Davids part because i was doin it with him. We took off from the catback.

infinitebird

iTrader: (11)

Both of those are completely normal (if I'm understanding you correctly). A lot of people think 210 is too hot, and it probably is, but if you haven't changed the stock tune or installed a fan switch, the car will heat up till almost 230 if you let it idle long enough. That is the standard stock behavior.

The hissing when you take off the gas cap is just the vapor pressure being released from the tank. Both of the lt1 cars I've had have always done that.

DeltaT

iTrader: (5)

So are you running open headers now? With the catback off, what, if any, exhaust system do you have now? Where are the exits? Are you dumping a lot of hot exhaust under the car where it normally wouldn't be?

Jim

got V-8?

iTrader: (1)

He is running stock manifolds to a stock y through the cats and thats it.

goodrich969

iTrader: (9)

my pipe is dumped about half way under my car in the middle.


infinite bird- ive never had my gas cap hiss ever. is anything gettin to hot to explode like gas?

infinitebird

iTrader: (11)

No, it's just vapor pressure. Not sure why it didn't do that for you before but both my lt1s always have done that.

gnomee

iTrader: (16)

Like above. 210 is not that hot for a stock LT1 They run hot compared to alot of other engines at idle for long periods. It must be that reverse cooling. As for the gas cap, it is the vapors. Read the cap it specifically says remove slowly etc....

01WS6/tamu

iTrader: (37)

A lot of it can depend on the outside temperature too. If you are in yankee country then chances are it will not hiss bc the outside temperature is hot not enough to heat the fuel up to cause a vaporization issue. If you are in the south then it is common. Especially on a 110 degree day.