Guys w ATR headers

[Lynn D. Brown]

I am getting my ATR headers and DP ceramic coated, and want
to drill 2 holes into the headers, one on each side for EGT probes.

I have no idea where I should put the probes in order to have decent
access to the probes once the engine is fully assembled.

Just looking at the new headers, it appears that U would want to put
the probe holes right after the triangular section where the 3 header
pipes come together in a position where U can get at it. On the Turbo
side, that appears to be on the bottom side of the header to avoid the
turbo. And on the Drivers sidel, the best location appears to be on the
outside of the header tube.

Anyone got any input ?

 

[Christian Dionne]

Cylinder #1 on a SyTy and #5 on a TurboBuick. That's seems to be the most logical, usually these are the leanest and hottest, unless you have a power plate I'd say screw the EGT and get a WBO2, unless you already bought it.

 

[Lynn D. Brown]

EGT's & WB O2's

EGT's & WB O2's

Christian and Guys,

I am still up in the air on control systems for my new engine. whether I can stay w the stock ECM and use an Ultimate chip, or will have to go w a FAST system.

In any event I would think it would be useful to know the EGT on the two cylinder banks. How were U using the WB O2 system ? I guess it gives U a much more accurate reading of the O2 in the exhaust and relates this back to the inlet mixture richness - Correct ?

The stock ECM uses this same reading from the stock O2 sensor and adjusts the injector PW in order to keep the inlet mixture properly Lean. Is the WB O2 reading used to control anything - if not, then what is the purpose of it, and what do U do w this reading ? Does the WB O2 sensor plug in the same place as the stock one ?

I read all the stuff on the Internet about the DIY O2 sensor and the A/F meter reading U can get w the electronics board, but what good does all of this stuff do U if U can't use it to control mixture ?

 

[Christian Dionne]

I emailed this to you Lynn:

Dig and BG have code for the SyTy ECM that allows WBO2 input. They've used it for awhile now with pretty good results. Just think, a 50# program that's close like BG's Ultimate, then Dig's code hack for the fine tuning with the wide band.

I had an EGT for awhile and it didn't really tell me anything except if the run was consistent with the one before it. You can't compare your EGTs with anyone else's because the guages aren't that accurate, and the probe placement can change it abunch. My guage read over 1600F all the time in 3rd, but I never lost a turbine wheel or detonated. Others might reach 1500F and complain about knock, turbo failure, etc...

As far as knowing the two banks EGTs, the guages might not be too close, and with Bank-to-Bank injection, it doesn't really matter that much 'cause you can't really fix it. When you get a set of flowed injectors for a SyTy, just put the pair that flow the most up front or in back on a TurboBuick.

The truck I'm working on now has FAST, 72#ers, PTE 63E, BG's old Vortec heads, the usual "Stokes" grind CompCam, etc... If we only wanted 11's, I would of stayed with the stock ECM and 50#ers, but not being chip-literate, FAST w/WBO2 is the only way for us to put a full weight Typhoon into the 10's.

FWIW,

 

[lewisstraughn]

I put a bung in the 3 to 4 adapter that is used for a diferent turbo than the stock one. If you are using the stock turbo then you may not be using the adapter.

 

[smeagol]

There's really no reason to use that POS 3 bolt to 4 bolt adapter any longer, as it just adapts the 4 bolt flange to the 3 bolt Buick housings. PTE's housing replaces the Buick housing and the adapter, no need to worry about leaks or cracks, as that adapter often self destructs and causes problems.