Whats the max boost,under any circumstances (ie. W. Meth/water, 11.5:1 afr, retardd timing, 93 octane, etc.) That one could expect to get away w on astock 93 lt1?

 

Well you would need to explain what kind of compressor you will be running as that will explain how much air flow it's capable of flowing. Weather it's a turbo or a supercharger it all comes down to how many cfm's it can flow.

Think of pressure (psi) as simply a measure of restriction, this is not an indication of hp or compressor flow capacity. 10 psi from a t25 turbo is vastly less then 10 psi from a gt42 turbo, and all across the board these flow rates change per psi and per engine combination.

For example a 2.0L Mitsubishi can run 30+ psi with a to4e 50 trim turbo yet a similar 2.0L Honda engine would struggle to put out over 20 psi. It because of the engine combination that lets the Honda flow more air with less effort (lower pressure).

try to concentrate on hp levels as a determining factor for engine capability. You will notice what seemed imposable years ago is easily achievable today with modern technology. 20 yrs ago no one thought a stock gm v8 could make 700+ whp but it has happened many times these days.

Now i don't have experience with lt1's so i'm sure someone can chime in with there power potential who has experience.

 

8lbs generally speaking. 10lbs will take you about 6 months before you begin to lose ring lands.

 

alky injection helps a great deal. Mobandy was making great power at about that boost on a 130k engine for a couple years.

 

it seems like the c5 guys run more than this on a stock block. maybe 12 psi.

Though they do run meth, and some have had failures. However, there are a lot of people doing fine there. Many more C5 FI's than C4's it seems.

It seems people are more scared of 12 psi boost, on a stock bottom end LT1 than they are on a stock bottom end C5. I find this surprising considering the ltx motor is the superior platform for forced induction due to:

1. steel block
2. extra head bolt
3. reverse cooling
4. lower compression
5. c4's fuel return line (c5/6's dead head a single fuel feed line into the lines feeding the injectors, they need additional fuel system mods - beyond just a walbro 255 l/hr to support a superchargers HP add - if they want more than 550 rwhp).

On the flipside, they dont run as much spark advance either (they dont seem to need to to make crazy power).

Im asking about this because my procharger p600b is working 'too well'. Ever since I switched to greg's p600b 8 rib bracket, and ditched the procharger intercooler, im making boost as follows:

3000 RPM: 5 psi
4000 RPM: 7.5 PSI
5000 RPM: 10 psi.

Im afraid to rev it much higher and I ended up resetting my rev limiter to 5600 RPM as a simple fix to keep it from generating too much boost.

This is with a p600b and 3" pulley.
It helped ditching the procharger intercooler. I must have picked up 3 psi boost by getting rid of that thing.

Meth injection and also spark advance drops down to 22 degrees at 4000 RPM and then to 20degrees at 5000 RPM.

Other than my concerns of overboosting detonation, the thing runs like a bat out of ....