normal/safe/boosted egt?
02-02-2004, 09:37 PM
#1
1.5 BAR
Thread Starter
Join Date: Dec 2002
Posts: 1,008
normal/safe/boosted egt?
just installed my autometer egt. autometer recommends to install it 1-2 inches from turbine outlet on boosted and 1-2 from head in manifold on n/a cars. i installed it just after my turbine outlet in the downpipe. what is normal safe boosting egt. the most i've seen so far is 1300 degree. that was during a 110mph+ pull full throttle shifts 11psi boost starting from 1st gear. 11.0-12.0 afr and not hearing any detonation.
what do you guys think?
what do you guys think?
02-03-2004, 12:23 AM
#3
1.0 BAR
Join Date: Jul 2003
Posts: 580
Re:normal/safe/boosted egt?
I would say close the gap on the plugs a little bit. mabe like one point, and then retard the timing to about .75 degrees per lb of boost and it should bing the egt down a little. it seems a little hot to me. but not that hot.
02-03-2004, 12:26 AM
#4
1.5 BAR
Join Date: Jan 2003
Posts: 1,183
Re:normal/safe/boosted egt?
Originally Posted by nigel
I would say close the gap on the plugs a little bit. mabe like one point, and then retard the timing to about .75 degrees per lb of boost and it should bing the egt down a little. it seems a little hot to me. but not that hot.
02-03-2004, 02:37 AM
#5
0.5 BAR
Join Date: May 2003
Posts: 141
Re:normal/safe/boosted egt?
Correct me if I'm wrong, but I thought retarding the timing actually increases EGT?
And I would think the EGT would be lower after the turbo just because it is further from the point of combustion. It should also be lower because part of the thermal energy (hot exhaust) is being turned into mechanical energy (rotation of compressor wheel). Then again I am no physicist (can't even spell it
) so I may be wrong and sometimes I wear glasses to look smart . 
And I would think the EGT would be lower after the turbo just because it is further from the point of combustion. It should also be lower because part of the thermal energy (hot exhaust) is being turned into mechanical energy (rotation of compressor wheel). Then again I am no physicist (can't even spell it
) so I may be wrong and sometimes I wear glasses to look smart .
02-03-2004, 11:35 AM
#8
1.0 BAR
Join Date: Jan 2003
Posts: 369
Re:normal/safe/boosted egt?
I'm afraid I must disagree. Running rich will raise EGT as well as keep more of the pipe hotter for a longer time. Running lean doesn't get your engine any hotter, EGT's will go down but the destruction comes from leaving extra oxygen in the cylinders and on your red-hot pistons that just saw a temperature spike. I like this analogy- say you are using a firesaw (torch) and you wanna make a cut. You put the fire up to the metal, get it hot as hell, then blow a whole bunch of extra oxygen through it. You cannot make a your charge give off less heat by taking away fuel and leaving a less-than-stoich mixture. I ran really rich for a week. I burned out two stainless flex pipes. Running stoich or lean wouldn't do that.
