How Much Boost for Cast Iron Internals?
- Thread starter MuuMuu101
- Start date
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rgreule
Well-Known Member
I have a friend that made 850+ whp on a stock motor.. was a 350 sbc though..
keep increasing boost until it blows up, then back it off a little....
OldmanRick
Well-Known Member
I'm the last person you'd want to ask about boost, but I've known guys that ran 6lbs with pump gas, and 8.5ish compression engines that ran like stockers, and had great mid-range power. Really depends on what you're looking to do with it?
Fuel system(s) / type of boost(Rootes/turbo/centrifugal supercharged???)/ expected reliability & power output/ and tunable/ what fuel?????.......
Let's just say 91, turbo, fairly reliable (daily driver status), power = better than stock, and tunability doesn't matter. Basic build, nothing too radical.
5-7 depending on compression, make sure it does not go lean or good-by bottom end.
You better damn know how to tune it, or things get bad real fast.
You better damn know how to tune it, or things get bad real fast.
Mad Dart
Nothing to see Here!
It is all in the tune. Guys are running 20+ Pounds of boost on stock parts.
I guess by tuneability I meant it doesn't matter if it's carbureted or fuel injected.
Carb or FI you will need a A/F wide band to know exactly what is happening.
Fuel pressure must stay consistent.
Detonation will kill any motor.
Throwing a Weiand roots blower on a brand "x" toy I have right now.
Tune it and it will live, just bolting parts on will lead to a quick death.
Fuel pressure must stay consistent.
Detonation will kill any motor.
Throwing a Weiand roots blower on a brand "x" toy I have right now.
Tune it and it will live, just bolting parts on will lead to a quick death.
Jimmyrigged
On the wastegate
Correct. A/F Wide band is mandatory. Rich is better then lean. use a vac distributor and plum it to manifold vac. you don't want it to advance under boost or BANG. Head gaskets will be the first to go. I would not go over 5 lbs boost with a stock motor in new condition with a great tune up and a solid fuel delivery. With Head studs and boost style head gaskets 7-8 psi. with meth injection you can go a little more. any time you boost on a stock motor stuff can go wrong. it will find a weak link. just a little advice from my check book. all this advice is on the cheap build. more money the better the system. boost a older motor and you will wipe out the ring's or worse. Hope this helps. Good luck and have fun
Im running 7psi on my dart with a complete stock 5.2 magnum, with 150k+ miles in it, Efi and a vortech V3 supercharger. Running low 13's all day long on 245/60 bf goodrich radials. Looking to increase boost a little and rebuild the engine soon, but will keep it stock internals. Hope to see the 11"s in the 1/4 with better tires, more boost and a set of piston rings that seal hehehe.
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