well everyone has been saying 12-14 psi is the limit for a stock bottom end.
ive been running 18 psi at the track for some time now,so this last weekend i decided to run more now that i have a megasquirt and can tune on the fly.

i never made a sucseful pass @ 23 psi(was blowing the intake pipes off in the burnout box due to the bov not being able to flow enough) but i did have about 50 miles on the motor for tunning with boost that high and didnt have any issues

i was running it with an afr of 10.2-1 and 12* total ignition timing

i quess we will never know if it can take that amount of boost for extended periods of time but it did hold up for the amount of time i had on it

 

Who says the limit is 14 (or so) PISG?

You can't equate how much an engine can take simply to an arbetrary boost number. On one engine the cylinder pressures (the important variable) could be higher at a lower PSIG due to greater cylinder filling as compared to another engine.

I plan to run 15 PSI on my 3500, probably more, since I will be using a 3 BAR MAP sensor (the code I will be using only supprts 3 BAR MAP), and have the ability to map higher boost pressures. As long as my turbos don't run out of steam.

 

To help prevent blowing off the hose under boost, add another hose clamp on the soft line right before it goes over the hard line. Tighten it so that it is just under tension. What this does is to prevent the soft line from ballooning and sliding out from under the coupler hose clamp.

Ty-raps/clamps on the MAP and FPR vacuum/boost line(s) are also recommended.

RBob.

 

it seems that on a few boards everyopne seems to think that 12-14 psi+ that ur gonna break the pistons.though a boost number is kinda useless,when comparing 2 identical motors it can be used.and if one was good with math u could actually use the compressor map to figure out actual airflow at a given psi


right now im gonna see about getting a 4 bar map sensor for my ms,i really want to push this stock bottom end motor until it fails.but i want it to fial due to power not from detonation.this way we can finaly find out just how much the block/rotating assembly can take

so far its proven itself to 7,800 rpms for short periods and lots of boost
though i have learned above 7000 it was starting to detonate with lower boost levels so ive reset my shift points to about 6,800
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almost what i had in mind, what my plan is is to weld a threaded bung to the pipe so i can have a tie bar that bolts to the manifold this way the pipe cant blow backwards.
im also getting rid of my silicone couplers for reinforced heavy rubber ones and im swaping out all the hose clamps for t-bolt clamps