arod

I need some HELP…

I have a 306 with a 10.5 compression; it also has a E cam from ford racing, GT-40 intake and cast iron GT-40 heads with stock rockers… I am planning to install a supercharger to my car, But people are telling me that I am not going to be able to boost a lot because of the 10.5 compression… I am running 91 octane gas…If anybody know how much boost am I going to be able to run, and be safe please let me know…thanks…

disturbed471985

Id stay between 6 and 8. Since ur comp is so high why not go nitro?

samseed101

You could go a bit higher, but I wouldn't risk it in your situation. I'm going to have to say 6 - 8 PSI as well. More info would be helpful too though. stock block or aftermarket? Forged or hyper? etc...

7upedition

a wet nitrous kit would be better suited, less expensive and less risky in this case.... jmo though ideally 9:1 compression for 10-12 lbs boost.... getting a 5lbs blower just doesn't seemworth itin my mind

arod

I forgot to tell you guys that my car also has 24 pounds injectors, 255 fuel pump, and it has a stock block, O yeah I have forged pistons too… I really do not want to put NOS because I want to have the power when I need it on the street.. not just have the power at the track...

disturbed471985

Nos is not just for the track i use mine on a reg basis. Nos is only bad when you act stupid with it. Actually its easier on the engine then a charger.

88BlueGT

+1 You can use nitrous whenever you feel like it.... just make sure you have the bottle filled.

Chitown racer

Im just curious, how do you know you have 10.5 to 1 compression for sure? Some piston manufacturers post inflated compression numbers.

samseed101

I imagine that since he bored it out and swapped out the top end, he probably checked the compression as well. Just a guess though. You never know sometimes.

arod

Because the owner that sold the car put the motor together and he told me that It had 10 to 1 compression …I also know that when I put 87 octane on the car and I gun it the car starts to ping around 4000 rpm’s and when I put the 91 octane it dose not do that… the timing on the car is stock…