How much Hp???
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How much Hp???
I was wondering if someone would have an idea of the horse power i could expect in my 4.9. Its getiing comp cam High Energy 218/218 Hydraulic Flat Cam, Microsquirt ecu, 42lb injectors, and i plan on pushing around 8lbs of boost but i may do less depdning on how the enginge acts.
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I was wondering if someone would have an idea of the horse power i could expect in my 4.9. Its getiing comp cam High Energy 218/218 Hydraulic Flat Cam, Microsquirt ecu, 42lb injectors, and i plan on pushing around 8lbs of boost but i may do less depdning on how the enginge acts.
The head will need new valve springs and retainers with .050" "up locks" on the exhaust retainers.
The Comp 268 cam raises the DCR over the stock cam and you will need to be really conservative on the ignition timing to prevent detonation.
The main object is to increase the low to midrange torque with the proper size turbocharger.
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The EFI head normally has an ignition timing limit of 30 degrees BTDC because of it's fast burn combustion chambers.
If you lower that to 28 degrees for extra margin and retard it 1 degree for each lb of boost, the ignition trimming could be as low as 20 degrees at 8 lbs of boost.
The power level will be just fine.
Any detonation under boost will do piston and ring damage very quickly.
You can also use water/methanol injection under boost to increase power and lower the chance of detonation.
Will this be a daily driver that will pull loads or just a light duty to go fast on occasions?
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The turbocharger should have a compressor inducer no larger than 57mm for a stock head with the Comp 268 cam.
The EFI head normally has an ignition timing limit of 30 degrees BTDC because of it's fast burn combustion chambers.
If you lower that to 28 degrees for extra margin and retard it 1 degree for each lb of boost, the ignition trimming could be as low as 20 degrees at 8 lbs of boost.
The power level will be just fine.
Any detonation under boost will do piston and ring damage very quickly.
You can also use water/methanol injection under boost to increase power and lower the chance of detonation.
Will this be a daily driver that will pull loads or just a light duty to go fast on occasions?
The EFI head normally has an ignition timing limit of 30 degrees BTDC because of it's fast burn combustion chambers.
If you lower that to 28 degrees for extra margin and retard it 1 degree for each lb of boost, the ignition trimming could be as low as 20 degrees at 8 lbs of boost.
The power level will be just fine.
Any detonation under boost will do piston and ring damage very quickly.
You can also use water/methanol injection under boost to increase power and lower the chance of detonation.
Will this be a daily driver that will pull loads or just a light duty to go fast on occasions?
More Turbo
Joined: Nov 2015
Posts: 715
Likes: 112
The more the air/fuel mixture is compressed, the faster it burns so the timing must be retarded as the intake manifold pressure is increased.
You will need to adjust the timing table to reduce timing above 100 kpa
You will need to adjust the timing table to reduce timing above 100 kpa
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