Max allowable temp depends on your exhaust valves & hotside wheel. I've seen various turbo mfg's spec max exhaust inlet temps anywhere from 1650-1900F. Inconel exhaust valves will tolerate more heat than stainless. Tuning for about 1650F max EGT is sort of the "standard" to shoot for when it comes to turbo EGT's, temp being measured in the manifold BEFORE the turbo exhaust housing. That being said I've seen where "short use" people (i.e. drag guys) have EGT's in the 2100-2200F range but that's only for a couple seconds at a time. I have a friend with a *nasty* Dodge diesel on nitrous (over 700rwhp, it's way faster than a 7600lb truck should be) that sees 1850-1900F EGT's when he's in pulling competitions (diesel EGT's usually are preferred to be 1050-1100F max...)
If your EGTs are too hot, drop the boost and up the timing... or you may be overly rich and you might have to pull fuel out. Dumping fuel, to a point, cools the mixture & EGT but put too much fuel in and the EGT's will start climbing again as it can't burn completely in the chamber and continues burning in the exhaust port.
For a starting point I'd say 11.0:1 AFR under WOT is good and play with the boost & timing from there to control the max EGT.
__________________
1969 Chevelle
Old setup: Procharged/intercooled/EFI 353 SBC, TKO, ATS/SPC/Global West suspension, C6 brakes & hydroboost.
In progress: LS2, 3.0 Whipple, T56 Magnum, torque arm & watts link, Wilwood Aero6/4 brakes, Mk60 ABS, Vaporworx, floater 9" rear, etc.
Last edited by Blown353; 02-20-2007 at 06:09 PM.
|