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L31MaxExpress's latest activity
L31MaxExpress
replied to the thread
12200411 PCM swap for 1996 to 2000 GMT400 trucks
.
I nerded out. Given my 97 made 257 whp and 310 wtq on 91 octane and 272 whp and 330 wtq on E85 without the help of a Whipple, the 360...
Mar 27, 2024
L31MaxExpress
replied to the thread
12200411 PCM swap for 1996 to 2000 GMT400 trucks
.
Should work well, it is an extraction from a black box GMT400 tune, converted to the 0411 data points.
Mar 27, 2024
L31MaxExpress
reacted to
Scooterwrench's post
in the thread
Headers, headers, HEADERS??
with
Like
.
You'd pretty much have to,only way you're gonna get any air through that.
Mar 26, 2024
L31MaxExpress
replied to the thread
Headers, headers, HEADERS??
.
My 2011 M56S had tri-y manifolds ahead of the cats, but for some reason still had the same Y-pipe and cat back as the V6 cars. The stock...
Mar 26, 2024
L31MaxExpress
replied to the thread
What to do with pre cat and after cat 02 sensors
.
There is a table that IIRC relates catalyst temperature to airflow and commanded air/fuel ratio. With correct fueling and timing, EGTs...
Mar 26, 2024
L31MaxExpress
replied to the thread
Headers, headers, HEADERS??
.
Atleast the flat head had 3 ports, the newer engines have one. Dodge, GM and Honda are all using this garbage now. Reminds me of the I6...
Mar 25, 2024
L31MaxExpress
reacted to
PlayingWithTBI's post
in the thread
Better gas mileage and performance.
with
Like
.
"Up to 12"? Why so low?
Mar 25, 2024
L31MaxExpress
reacted to
PlayingWithTBI's post
in the thread
Better gas mileage and performance.
with
Like
.
You beat me to it, ha ha!
Mar 25, 2024
L31MaxExpress
replied to the thread
What to do with pre cat and after cat 02 sensors
.
Do not agree on removing catalyst overheat mode. That is there to protect your pistons and exhaust valves as well. The added fuel is...
Mar 25, 2024
L31MaxExpress
replied to the thread
Better gas mileage and performance.
.
13-14 is the sweet spot most like.
Mar 25, 2024
L31MaxExpress
replied to the thread
Better gas mileage and performance.
.
The computer is programmed to run the engine close to 14.7:1 without the need for 02s. For startup, initial warmup, WOT as well as Lean...
Mar 25, 2024
L31MaxExpress
replied to the thread
MAF - Parts Cannon Story - Paying it Forward
.
He is talking about new parts being DOA.
Mar 25, 2024
L31MaxExpress
replied to the thread
What to do with pre cat and after cat 02 sensors
.
I know for a 100% fact that the National Parks and Forest service had trucks available to them without catalytic converters. Without...
Mar 25, 2024
L31MaxExpress
replied to the thread
What to do with pre cat and after cat 02 sensors
.
Agreed on GM doing weird stuff, looked up under a 5.7L powered Express van in the wrecking yard a few months back. No 02s and no cats...
Mar 25, 2024
L31MaxExpress
reacted to
Scooterwrench's post
in the thread
Better gas mileage and performance.
with
Like
.
I'm still running iron logs and restrictive factory exhaust minus the cat. I may need to turn my fuel pressure up to 12psi.
Mar 25, 2024
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