a cossie could hold psi wise with standard c/r?say with a uprated headgasket and the bottom end is ok no noise etc in a 2wd or 4x4?just a question out of interest i would say around 24ish psi

 

mine was holding 27psi,,,, once when the wastegate was stuck shut it was holding over 2bar( thats the max my gauge read)

they EASY hold 32psi if checked right

 

with the right fuel/turbo/cooler/etc, miles over even 30psi.

 

bloody hell that alot of boost!surprising really

 

steve dont think the 4x4 box would

but yeah as steve says

davecos4x4 is on a standard engine, hes got the same theory as steve i belive

standard engine, when it goes its easier to find another one and not as much cash to get sorted

 

not really, its well proven that the stock bottomend can do well over 500bhp, and revs are a bigger killer (IF a car is set up right) than boost pressure, so yup, mental boost is possible if set up right for it.

 

not really considering they got proper rods/pistons/crank as was built for homologation purposes

time for siemens and a live map i guess

 

Mnie is standard CR and sees 32psi at the same time as swallowing the contents of a set of 125bhp nitrous jets

 

Ps

Main reason they take so much boost is the head is fucking shite, so massive boost doesnt actually equal much air going into the engine

Renaul 5s do it even better, 2 bar of boost and still not under any strain inside the engine as nothing gets into it, lol

 

R5s do it mostly due to the carb! its fucked it before the head is anywhere near, lol.

BUT i wouldnt call the heads shite, both these engines need big boost due to seemingly low flowing heads, but these small ports etc are what gives both these engines seemingly fantastic torque and drivability over their "rivals".

Boost is your friend.

 

cool thought it would blow the big ends out above 24psi but good news that it could hold alot if u had a standard engine

 

Just remember that boost isnt a measure of power, its a measure of how much the engine is resisting making power.

 

comparing a cossie engine a c20let, i think the cossie is shite at drivability despite its more restrictive head, but there are other factors, the standard cossie manifold for example is rubbish for drivability but great for top end power.

 

i would not of thought it could take that much compressed air before flatting the big end shells

 

my old saff on a t3 had a spike of 1.83bar on the boost controller and usually held around 24/5 on my guage

 

You are aware are you that the peak pressures on the big ends arent really any higher than they are in a N/A motor as the timing is retarded to spread the increased load over a larger percentage of the cycle.

The pressures dont get any higher, if they did you would get det, in fact the opposite is true, the PCP come down slightly as boost increases as the hotter intake charge is more likely to det.