Quote:
Originally Posted by civicgotspeed
remember...its not the pounds of boost that kills your motor...its the amount of power youre making that kills your motor...15 pounds making 300whp wont pop before 6 pounds making 400whp.....
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! The stress on your motor has a lot to do with the boost pressure you throw at it. Rough Example...
Small turbo: 15 psi = 400 whp.
Big turbo: 8psi = 400 whp.
You might think that since you are making the same power, your engine is under equal stress from each turbo. This is not true.
On the smaller turbo, you have 15 pounds per sqaure inch of air exerting force everywhere from the compressor outlet to the cylinder. This means more stress on the pistons, cylinder walls, rods, bearings...everything. On the larger turbo, you only have 8. The reason you make more power with the larger turbo is because it can flow a larger mass of air in the same amount of time. Therefor higher boost levels are more dangerous.
Also boost pressure affects the compression ratio of your engine. (I got yo back spenny lol) and as we all know, higher compression ratios means higher octane gas ratings...(AND COMPRESSION AND COMBUSTION PRESSURES). So the more power you can make at low boost, the better.