Dear all, I have recently installed the APS TT kit on my car, thus during running in period I chose not to push it on the limits. Last Weekend I decided to do a test run. Following are the facts
1) Installation APS TT, APS Plenum, NGK plugs one step colder, Veilside exhausts tear drops.
2) 100 Octane Racing Fuel
3) Ambient Temperature 35Celsius/95F.
4) Boost 0.55bar 7.97PSI
My EGT were constantly bellow 800C/1470F. When I press really hard. Full Throttle on 6th Gear, Alarm went off on DEFI Gauge and read 850C/1560F.
Can please somebody advise me the working envelope with this installation?
Thanks in advance

 

I get similar readings with my APS TT. My EGT is usually between 900-1100F while driving normally and will climb up to 1400-1500F when WOT in 4th+ gear.

 

Where did you guys tap into for the egt sensor? Im hoping to do that soon.

 

I tapped mine in the LHS exhaust manifold about 1.5 inches from the cyclinder closest to the firewall. I think that's cyclinder #1. My manifolds are also ceramic coated but I doubt that makes a difference in EGTs.

Hey Brian, I want to hear your new exhaust man. When are you going to be at Axiom again?

 

What exhaust are you running? Test pipes or cats?

 

Who tuned your car? Did you tune extra conservative?

 

I am running the Veilside cat back exhaust 2.5in.

I haven't yet done a Unichip Fine tuning. I am planning to do so this month. I don't quite use the car as I am travelling alot abroad. It was third time out of Garage, and I am really smooth on her till I will have my DYNO results and the Fine tuning performed.

As far as the EGT are concerning I installed two of them on each manifold, in order to control both Vsides better. Though the installation of the sensor was little bit far from the Cylinder exhaust thus an increase of 100F is anticipated.

 

I would switch to atleast the aps 2.5" with test pipes. I will put money down that you will see a noticable drop in EGT temps and a nice increase in power

 

just curious what kind of material is the exhaust made of?? Doesnt steel melt at 1500F?

 

High Temp resistant Cast Ni-Alloy.

 

Nope steel is going to melt way above 2000 degrees F.

 

Steel isn't even thinking of melting at 1500F. It depends on the alloy used, but a good average melting point for steel is 2500F.

If you're running the out of the box tune, that may explain it. Overly retarded timing will cause EGTs to climb. Also, the more load on the engine, the higher the EGT. Boosting in 6th gear is probably going to result in the highest EGTs possible for your car. If you tested it in 4th I suspect they'd be lower. Get it tuned, and it'll be even lower (and you'll make more power).

 

Ya i just realized its 1500F not 1500C yea steel melts at 1500C my bad.

 

very true. most pople don't know this. Someone thinks they have a nice "safe" conservative tune yet the very retarded timing is causing very high cylinder temps and could melt aluminum pistons!!!

they would be better off lowering the boost and putting the timing up higher. safer on the engine.

 

i would have thought so too, but a friend of mine installed the aps exhaust and his EGTs didnt drop under WOT, but what it did do was cause them to drop substantially faster once off the throttle.

 

Very true, retarded ignition timing does raise the exhaust gas temp...............lower boost with a more advanced ign timing map is a far better tuning strategy.

 

As much as i know retarded timing do raise the EGTs not the cylinder temps.

 

the reason is, when you retard timing, the burning process is delayed and meanwhile the exhaust ports open, leting the combustion to proceed during the exhaust runners of the cylinder and sometimes in the exhaust manifold too. This situation increases the EGTs as a nature of fact.

 

I fully agree. If you have early injection then the cylinder temperature will rise and the possibility of Engine knocks increase significantly. Also note that earlier combustion will increase the Max Pressure in the cylinder, thus posibility to burn your stock pistons. I do believe that the retard injection is safer than the early one. In any case, what I would like to figure out is somehow the anticipated working max temperatures of the exhaust gas, with the APS TT setup.

 

my sensor is located just after the turbo (had some bad experiences with egt probes breaking off and destroying / damaging turbo. I take 800C as limit now but after i install my cossy heads I'll shoot for 900C as I'll have heat ressiliant valves.