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Message: [QUOTE="Extended Power, post: 438606, member: 898"] Try this...with your truck in park, rev the engine to 2500rpm...what kind of boost does it make? Should be FA. Now put the truck in gear, hold the brakes hard, and try to rev the engine to 2500 rpm...now what do you see for boost? If you were able to even hold the truck from shooting forward, you should have seen over 20 psi of boost easy. What I'm trying to show here, is that even at the same rpm, if there is no load on the engine, there is no drive pressure to drive the turbo, and no boost. Bigger injectors fuel the same whether there is a load or not, so if the turbo isn't providing the extra air, it's all just going to be heat. By using lower gears, 4:88's, the engine is reving higher, but it has less load on it then if it were running a set of 4:10's or 3:73's. Less load on engine, = less boost = higher EGT's BTW: With 4:88 gears, the driveshaft turns 4.88 revolutions for every one revolution of the ring gear in the rear end. So if they swapped to 4:10's or 3:73's the engine would rev lower. (4.1 revolutions of the driveshaft, to one of the ring gear....or tire.) Not trying to be a dick, just trying to help. [/QUOTE]

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