How hot are your cats?

Justin@VMP · March 5th, 2009, 09:10 PM

I know how hot mine are.

Today I was testing some high-flow 2.5" cat pipes that I had made a while back.

I installed thermocouples at the inlet of the cat and inside the cat itself.

Cats usually melt around 1650F, being that the factory ones are so close to the engine and so restrictive, they tend to melt very easily on higher HP cars. Reducing backpressure and moving the cats farther back will help extend their life.

I would like to keep cats on my car (while still producing alot of power) to keep the odor and noise down, not to mention its enviromentally friendly if you like to hug trees.

Here is a shot of some of the data I acquired:

I basically beat the piss out of the car on the dyno to see what kind of EGTs I could produce. The peak under load was about 1700F before the cat and 1750F inside the cat, I experienced some type of misfire when the car got very hot and saw even higher temps on decel (off the chart 1800F+). For reference peak ECT was 196F and DSACT was 150F. Cat protection was disabled during testing, but the car was running pretty rich, high 10s, so at 11.7:1 the cat temps would be even higher. I will test these cats out at sebring in April and measure temps and see how they hold up.

UnleashedBeast · March 6th, 2011, 08:00 PM

Justin,

How did the additional testing go at Sebring?

I was considering upgrading to Lethal's catted X pipe, as I also do not want the smell. What are your thoughts on magnaflow's metallic spun cats?

Justin@VMP · March 8th, 2011, 09:35 AM

the metallic spun cats are much lower restriction and should hold up better since they make less backpressure

i could not get readings at sebring and later found out my teeny little EGT probes had burned off

2008gt500nl · March 15th, 2011, 01:11 PM

When I push the car i have always been seeing between 1470 and and 1742.
running 98 octane RON

That was with the CAI and also now with the blower upgrade..

I am considering to upgrade headers and midpipe

I keep following this topic..

March 5th, 2009, 09:10 PM	#1
Justin@VMP Administrator Join Date: Jul 2005 Location: Orlando/Daytona, FL Posts: 936	How hot are your cats? I know how hot mine are. Today I was testing some high-flow 2.5" cat pipes that I had made a while back. I installed thermocouples at the inlet of the cat and inside the cat itself. Cats usually melt around 1650F, being that the factory ones are so close to the engine and so restrictive, they tend to melt very easily on higher HP cars. Reducing backpressure and moving the cats farther back will help extend their life. I would like to keep cats on my car (while still producing alot of power) to keep the odor and noise down, not to mention its enviromentally friendly if you like to hug trees. Here is a shot of some of the data I acquired: I basically beat the piss out of the car on the dyno to see what kind of EGTs I could produce. The peak under load was about 1700F before the cat and 1750F inside the cat, I experienced some type of misfire when the car got very hot and saw even higher temps on decel (off the chart 1800F+). For reference peak ECT was 196F and DSACT was 150F. Cat protection was disabled during testing, but the car was running pretty rich, high 10s, so at 11.7:1 the cat temps would be even higher. I will test these cats out at sebring in April and measure temps and see how they hold up. __________________ Justin Starkey - VMP Tuning - Ford & GM Tuning Mobile DynoJet 224xLC Load Control Justin@VMPTuning.com 321-206-9369 2007 Shelby GT500 Ford Racing TVS Blower, VMP 2.6" Pulley, IW 10% OD lower, TB, 697RWHP/702RWTQ 2006 F250 6.0 14.3@93 2000 Mustang 3.8 A4 TT 450RWHP@17psi & 10.9@127.8 1.74 60ft@17psi stock motor 2006 Mustang 4.0 M5 Vortech 15psi 395RWHP 12.5@110 wife's car

March 6th, 2011, 08:00 PM	#2
UnleashedBeast Registered User Join Date: Feb 2011 Location: Pensacola, Florida Posts: 5	Justin, How did the additional testing go at Sebring? I was considering upgrading to Lethal's catted X pipe, as I also do not want the smell. What are your thoughts on magnaflow's metallic spun cats? __________________ 2009 Shelby GT500 (Vista Blue) #2915 of 3004 coupes - #365 of 381 in Vista Blue FRPP CAI (Amsoil Filter), Metco 2.6" pulley, Motoblue 90mm idler, VMP tuned, UMI LCA & UCA & Panhard Steeda Comp. springs, 3.73 FRPP gears, 18x11 SVT wheels, 345/35/18 MT ET Street Radials, Shaftmasters Aluminum Drive shaft

March 8th, 2011, 09:35 AM	#3
Justin@VMP Administrator Join Date: Jul 2005 Location: Orlando/Daytona, FL Posts: 936	the metallic spun cats are much lower restriction and should hold up better since they make less backpressure i could not get readings at sebring and later found out my teeny little EGT probes had burned off __________________ Justin Starkey - VMP Tuning - Ford & GM Tuning Mobile DynoJet 224xLC Load Control Justin@VMPTuning.com 321-206-9369 2007 Shelby GT500 Ford Racing TVS Blower, VMP 2.6" Pulley, IW 10% OD lower, TB, 697RWHP/702RWTQ 2006 F250 6.0 14.3@93 2000 Mustang 3.8 A4 TT 450RWHP@17psi & 10.9@127.8 1.74 60ft@17psi stock motor 2006 Mustang 4.0 M5 Vortech 15psi 395RWHP 12.5@110 wife's car

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March 15th, 2011, 01:11 PM	#4
2008gt500nl Registered User Join Date: Oct 2010 Location: Netherlands Posts: 23	When I push the car i have always been seeing between 1470 and and 1742. running 98 octane RON That was with the CAI and also now with the blower upgrade.. I am considering to upgrade headers and midpipe I keep following this topic..