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#1
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Which one would you choose?
Just curious which dyno curve would you choose for your street car (red or blue curve)
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#2
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Blue...torque is king for a street car. An engine produces torque. HP is an equation......... HP = (torque x RPM)/5252
George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum |
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#3
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Depends on gearing and if you prefer to spin it!
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
#4
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That is one spunky OHC!
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"At no time did we exceed 175 mph.” Dan Gurney's truthful response to his and Brock Yate's winning of the first ever Cannonball Baker Sea-to-Shining Sea... Still have my 1st Firebird 7th Firebird 57 Starchief |
#5
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What are those vertical numbers on the left of that chart!?
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#6
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HP numbers but cut off some
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#7
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Looks like a overlay of a 455 and a 454 but can’t see your hp scale.
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#8
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Looks like substantial torque loss (Red) for limited HP gain. I'd expect more power gain with that RPM carry.
Blue would be better for 'most' street cars. A radical Red guy could run a good 5000 stall. lol but I'd want power to carry well past 6500 RPM. |
#9
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Depends how old your are,now at close to 76 my engines with OD trans virtually dont see 3500 anymore.Off idle to 2000 now where I live on the street.Tom
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#10
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Quote:
Heck even Turbo the beast for some 'passing power' If I don't demand more, I'll settle for much less. |
#11
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Depends on converter and gear
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#12
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don’t you kind of want the full y axis numbers to answer this question? i know i would rather have 35 hp than 20 hp at 4500 rpm regardless of what happens at 5800-6000 rpm. but i might choose to accept, say, 520 hp at 4500 instead of 535 if it meant i got 620 at 6000 instead of 610 at 5800.
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#13
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Blue...
I just built a basic 400 similar to a W72. spc-4(066) cam installed at 113. 8.2:1 compression 6x-4 heads with stock intake. Dougs headers and 2.5 dual exhaust. the car is my 79 TA with a 2.64 first gear Super T10 and 3.42 gear. I was not expecting much, but I was quite suprised. having torque everywhere is quite fun. my current motto is don't over cam for the street. Grain of Salt here, but added what DD2000 says about the build
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1979 Firebird Trans Am 301/4spd (Now 428) 1977 Firebird Formula 400/Auto 2007 Grand Prix GXP 5.3L Last edited by 74Grandville; 10-13-2021 at 09:43 PM. Reason: add pic |
#14
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Dyno of 3 cams and 2 intakes. 60 HP swing from bottom to top. 10 CR 454 with AFR 265 heads.
With a 4500 stall converter I'd want the Black curve it used a solid roller 248/256 @ .050 - .630 valve lift - 110 LSA. Red and Black used a single plane intake, others were dual plane. Last edited by pastry_chef; 10-13-2021 at 09:52 PM. |
#15
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Quote:
Here's a power equation for smarter people that does not use torque at all. https://www.grc.nasa.gov/www/k-12/airplane/ottoa.html There was a long debate on Speed-talk. I was not surprised the best of the best agreed horsepower was king. They probably had 100 NHRA records between them. Legit. Nascar R&D measures HORSEPOWER for every cylinder in their engine from cylinder pressure. https://www.youtube.com/watch?v=rBZCnG1HwDM Last edited by pastry_chef; 10-14-2021 at 12:10 AM. |
#16
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Quote:
there is no getting around the fact that power equals work over time. if you reduce power, it takes longer to do the same amount of work. do you think you would you go faster with an engine that peaks at 1000 ft lbs of torque at 1000 rpm, or one that peaks at 500 ft lbs of torque at 6000 rpm? the first has a higher torque figure, but the second makes three times more power and will accelerate any pontiac in existence much more quickly. |
#17
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Torque is putting your beaker bar on the wheel nut and then adding force, WITHOUT MOVING THE NUT.
When / IF I move the nut, then force was applied over angular distance and there was a start time and a stop time. Force exerted through radians over time = POWER always. I did work and power does work. Torque cannot do work. |
#18
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Guys this is the street section not the race section. Racing rpm and hp are king but for a street car (one that actually gets driven a lot with good drive ability) not sure rpm/hp is king. Say you have 4000lb car with 3.42 gears and 3000-3500 stall, which one you taking?
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#19
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Quote:
Still power. Power is made from 3 things. 1 Displacement 2 RPM / piston speed. 3 efficiency - BMEP. Efficiency is very limited. Fuel says compression can only be so high. When RPM is limited that leaves BIG displacement / engine size to increase power there. Using mean piston speed. horsepower = (BMEP * engine total bore area * MPS) / 132000 Woks at only 1500 RPM or 10000 RPM. Let pick a well designed 600 cube engine for your example, will be hard to beat. Last edited by pastry_chef; 10-14-2021 at 12:37 AM. |
#20
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Quote:
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