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58 Posts
Hello All!
I have a story, and then subsequently a question :yell:
If you read my other post in exterior, I inherited a beautiful 1984 El Camino from my father in law. He did numerous upgrades, swaps etc, however some questions are starting to arise. In approximately 1997 the motor was swapped for a GM 350 Crate Motor (LS1 was the name that everyone tell me). The transmission was replace with 700r4, and the rear end was swapped with a 10 bolt "3.73" rear end. The paperwork said that the motor should be a 350hp 350 crate motor. My father in law also stated that it was a 350/350 when he was still with us. And to verify, I asked my mother in laws brother ( a gearhead & my wifes uncle ) what kind of motor was supposed to be in it. He answers 350/350. I assume that there should be some loss of power through the transmission ( it is an automatic ).
Here is the question.
I had the car professionally tuned. I eliminated all vacuum leaks, fuel to air on computer, etc, etc. These guys really have a handle on it. They also have an all wheel dyno. The results are puzzling
On the best of 4 pulls we get this 258hp / 313tq
So I assume a 20% loss of power if it was rated at the crank. That would still give me around 280hp/ ?tq to the wheels.
I have a couple of scenarios
A) The motor is not a 350hp motor. Either salesman stuff or a exaggeration on the part of the in-law.
B) There a large performance no no somewhere (Maybe help on common issues)
C) the automatic kills the overall performance of the motor.
D) The bad brake booster is causing overall performance deterioration
While I do like HP, I am not someone who is a "racer". The point of this question is too ensure that something is not very wrong with the car that myself, an amateur, needs to know so he does not blow up/slowly destroy a family heirloom.
Thank you ECC!:You_Rock:
I have a story, and then subsequently a question :yell:
If you read my other post in exterior, I inherited a beautiful 1984 El Camino from my father in law. He did numerous upgrades, swaps etc, however some questions are starting to arise. In approximately 1997 the motor was swapped for a GM 350 Crate Motor (LS1 was the name that everyone tell me). The transmission was replace with 700r4, and the rear end was swapped with a 10 bolt "3.73" rear end. The paperwork said that the motor should be a 350hp 350 crate motor. My father in law also stated that it was a 350/350 when he was still with us. And to verify, I asked my mother in laws brother ( a gearhead & my wifes uncle ) what kind of motor was supposed to be in it. He answers 350/350. I assume that there should be some loss of power through the transmission ( it is an automatic ).
Here is the question.
I had the car professionally tuned. I eliminated all vacuum leaks, fuel to air on computer, etc, etc. These guys really have a handle on it. They also have an all wheel dyno. The results are puzzling
On the best of 4 pulls we get this 258hp / 313tq
So I assume a 20% loss of power if it was rated at the crank. That would still give me around 280hp/ ?tq to the wheels.
I have a couple of scenarios
A) The motor is not a 350hp motor. Either salesman stuff or a exaggeration on the part of the in-law.
B) There a large performance no no somewhere (Maybe help on common issues)
C) the automatic kills the overall performance of the motor.
D) The bad brake booster is causing overall performance deterioration
While I do like HP, I am not someone who is a "racer". The point of this question is too ensure that something is not very wrong with the car that myself, an amateur, needs to know so he does not blow up/slowly destroy a family heirloom.
Thank you ECC!:You_Rock: