Spark plug issues

[RETed]

Originally Posted by project86

That sounds like pretty good number on an internally stock NA 20B. What are the reasons for advancing the timing in general? Also.. .cant running too rich lead to pre ignition just like running too lean?

Yeah, another 20B with stock twin turbos managed to put down 8hp more than our 232 #.

From my experience...

In a very simplified procedure for tuning, you want to advance the ignition timing for any "cell" in your ignition map right before it start to hit preignition.
This will give you best power.

Yes, overly rich conditions can cause "afterburn" out the exhaust.
Due to this afterburn, it can cause a lot of bad harmonics, which tends to hammer bearings and seals.
I've personally seen engines let go due to too much fuel (burning out the exhaust).


-Ted

[j9fd3s]

Originally Posted by RETed

Yeah, another 20B with stock twin turbos managed to put down 8hp more than our 232 #.

-Ted

that was my friends truck! he bought a cosmo front clip GOT RID OF THE ERROR CODES, and then swapped it into a b2600. it was totally stock except it had a 3" exhaust (so stock unopened engine, ecu, turbos, running sequentially, etc etc).

it dynoed 247rwhp... it did make more torque than Ted's NA, but still....

it was AWESOME in the truck too, its the BEST sleeper i've ever been in. when the second turbo came on in the lower 3 gears the right rear tire would just go up in smoke....

mike

[RETed]

Originally Posted by j9fd3s

it dynoed 247rwhp... it did make more torque than Ted's NA, but still....

Oops, sorry about that...make it ~15hp.
My aging brain is failing me again. :P


-Ted

[j9fd3s]

Originally Posted by RETed

Oops, sorry about that...make it ~15hp.
My aging brain is failing me again. :P


-Ted

hmm, maybe im wrong then, i wanna say it was like 8hp... either way it was a surprisingly small number!

-Mike