how much power???
#1
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Car: 87 iroc
Engine: charged 355 575 h.p.
Transmission: t-56
how much power???
I keep geting different estimates on what my h.p. will be
ive got a fresh 355 with the lt-4 hot cam
'90 vette heads w/5 angle grind 1.6 rockers
tpis mini ram w/58 mm t.b.
short headers
paxton sn 93 charger with 8-9 psi pulley
any recomendations on precautions for longevity?
ive got a fresh 355 with the lt-4 hot cam
'90 vette heads w/5 angle grind 1.6 rockers
tpis mini ram w/58 mm t.b.
short headers
paxton sn 93 charger with 8-9 psi pulley
any recomendations on precautions for longevity?
#2
Re: how much power???
Originally posted by 87iros355
I keep geting different estimates on what my h.p. will be
ive got a fresh 355 with the lt-4 hot cam
'90 vette heads w/5 angle grind 1.6 rockers
tpis mini ram w/58 mm t.b.
short headers
paxton sn 93 charger with 8-9 psi pulley
any recomendations on precautions for longevity?
I keep geting different estimates on what my h.p. will be
ive got a fresh 355 with the lt-4 hot cam
'90 vette heads w/5 angle grind 1.6 rockers
tpis mini ram w/58 mm t.b.
short headers
paxton sn 93 charger with 8-9 psi pulley
any recomendations on precautions for longevity?
#3
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Car: '88 Formula, '94 Corvette, '95 Bird
Engine: LC9, 355" LT1, LT1
Transmission: T5, Zf6, 4L60E
Axle/Gears: 3.42, Dana44 3.45, 3.23
Re: Re: how much power???
Originally posted by r3pp3r
Don't use LT4 hotcam, especially for a boosted engine. You want a cam made for boost. Or at least a cam with more than 114 degrees of LSA. I'd say if you get the right cam maybe 450hp unless you get better heads.
Don't use LT4 hotcam, especially for a boosted engine. You want a cam made for boost. Or at least a cam with more than 114 degrees of LSA. I'd say if you get the right cam maybe 450hp unless you get better heads.
I just checked. -5 degrees. I.e, no overlap. Seems to me it would be a decent blower cam. Should peak cyl pressure nicely.
-- Joe
Last edited by anesthes; 03-29-2005 at 10:34 AM.
#4
Re: Re: Re: how much power???
Originally posted by anesthes
Thats a missleading statement. Whats the overlap of the LT4 cam?
I just checked. -5 degrees. I.e, no overlap. Seems to me it would be a decent blower cam. Should peak cyl pressure nicely.
-- Joe
Thats a missleading statement. Whats the overlap of the LT4 cam?
I just checked. -5 degrees. I.e, no overlap. Seems to me it would be a decent blower cam. Should peak cyl pressure nicely.
-- Joe
#7
Re: 355 paxton
Originally posted by blackcherry355
so you say 450 rear wheel or flywheel h.p.???
so you say 450 rear wheel or flywheel h.p.???
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#8
Actually, you should be able to calculate it fairly close by working out the rpm that the blower will be spinning with those pulleys and seeing what the airflow is at that rpm… at that point airflow is proportionate to hp with the proper amount of fuel mixed with it, so you’re down to a rather simple educated guess.
Not having a compressor map or the pulleys in question to measure I’d be guessing.
Not having a compressor map or the pulleys in question to measure I’d be guessing.
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Car: '88 Formula, '94 Corvette, '95 Bird
Engine: LC9, 355" LT1, LT1
Transmission: T5, Zf6, 4L60E
Axle/Gears: 3.42, Dana44 3.45, 3.23
Originally posted by 83 Crossfire TA
Actually, you should be able to calculate it fairly close by working out the rpm that the blower will be spinning with those pulleys and seeing what the airflow is at that rpm… at that point airflow is proportionate to hp with the proper amount of fuel mixed with it, so you’re down to a rather simple educated guess.
Not having a compressor map or the pulleys in question to measure I’d be guessing.
Actually, you should be able to calculate it fairly close by working out the rpm that the blower will be spinning with those pulleys and seeing what the airflow is at that rpm… at that point airflow is proportionate to hp with the proper amount of fuel mixed with it, so you’re down to a rather simple educated guess.
Not having a compressor map or the pulleys in question to measure I’d be guessing.
-- Joe
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For blower rpm? I think it would just be as easy as
(De/Db)RPMe=RPMb
Where D=pulley diameter, e=at engine and b=at blower
Right??
And then you'd just need to see how much air your blower is moving at that rpm???
(De/Db)RPMe=RPMb
Where D=pulley diameter, e=at engine and b=at blower
Right??
And then you'd just need to see how much air your blower is moving at that rpm???
Last edited by Dustin Mustangs; 03-30-2005 at 10:14 AM.
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Car: 1991 RS
Engine: Procharged LT1
Transmission: T56
Are 90 Vette heads that good?
I doubt you would see 450 hp at the wheels. Maybe 400.
I doubt you would see 450 hp at the wheels. Maybe 400.
#13
No, the vette heads pretty much suck, but you only need to come up with about 220cfm on the intake port and properly match everything else to see 450 hp NA. If someone knows how many cfm that blower will move with the pulleys that he wants to run then we could make a pretty decent guess at the power output and the boost that it will see.
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