View Full Version : White turbine on exhaust side of T25? - Pics

08-06-2005, 10:32 PM
Hey guys,

im not really sure if this is normal or not but for some reason i dont belive it is. This is the t25 i just took off my sr that is getting replaced with a t28,

the t28 which is used that i have has black exhaust blades however my t25 has turned white

is this a sign of running lean or too hot?

i have no detonation or knocking on the safc-2 however my timing is a little sketchy....

08-06-2005, 10:38 PM
have you run race gas with it in the last couple months?

08-06-2005, 10:46 PM
no i always run 94 octane from sunoco

heres a picture


08-06-2005, 11:30 PM
looks normal to me..

08-07-2005, 07:36 AM
I asked the same question a while back, never really got a clear answer. I don't know if it was from running too hot or what. My O2 sensor had a white tip also. Was running ~14 psi for quite a while. Never had any problems. T25 on left, T28 on right.


08-07-2005, 11:25 AM
It does appear that you are running a bit hot. You should be able to verify with an EGT. What do your plugs look like? Best way to tell is do a complete run on the highway jamming through the gears(2-3-4). Once you let off in 4th then shut down the motor. Pull off on the side of the road and pull a plug or two. Look for signs of detonation and particularly the plug color.

08-07-2005, 11:29 AM
Once you let off in 4th then shut down the motor.

If you do this please only move the key 1 click. I knew someone that turned off the motor and moved the key completely to the off position. The wheel then locked and he smacked the curb. Luckily he was only going ~20mph.
BTW, my mom never found out I did that to her car http://forums.freshalloy.com/images/graemlins/wink.gif

08-07-2005, 07:41 PM
could timing that is too far advanced cause a motor to run too hot..

i dont belive im leaning out

but im investing in a wideband this week!

08-08-2005, 10:39 AM
Timing being too far advanced can cause it to run hotter but also retarding your timing too much can also do the same. I would make sure and check the timing with a timing light. Stabbing the CAS will not always get it perfect!