C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

What increases torque?

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Old May 14, 2003 | 03:40 AM
  #21  
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Default Re: What increases torque? (sraft)

383! :yesnod: :yesnod:
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Old May 14, 2003 | 05:14 AM
  #22  
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Default Re: What increases torque? (GlockLT4)

As you can tell, we all know how to increase torque, but we don't know what torque is. :p:

This thread is fun. :lurk:

Now here's my question:

A 1987 Honda CRX generates 73 ft-lbs of torque. Does that mean that if he revved at me, I could jump out and grab his tire to keep his car from moving by overpowering his engine? :lol: :rofl:

Let's also say there's a fat guy on a bicycle in the bike lane next to the CRX. He weighs 230 lbs, and he's on a bike that has a 6" long pedal arm. When he stands on the pedal, will he generate more torque than the CRX? And since his power to weight ratio is much better, will he get to the next stoplight first?



[Modified by CentralCoaster, 2:20 AM 5/14/2003]
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Old May 14, 2003 | 02:49 PM
  #23  
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Default Re: What increases torque? (CentralCoaster)


A 1987 Honda CRX generates 73 ft-lbs of torque. Does that mean that if he revved at me, I could jump out and grab his tire to keep his car from moving by overpowering his engine? :lol: :rofl:

Let's also say there's a fat guy on a bicycle in the bike lane next to the CRX. He weighs 230 lbs, and he's on a bike that has a 6" long pedal arm. When he stands on the pedal, will he generate more torque than the CRX? And since his power to weight ratio is much better, will he get to the next stoplight first?
Well it would depend on how big his fart can is, what color his car is, how many stickers he has, and whether he has NAAAAAAAAWWWWWWWWWWWWWSSSSSSSSSSSSS.
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Old May 14, 2003 | 07:05 PM
  #24  
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Default Re: What increases torque? (vader86)

My right foot when i push it to the floor..... :lolg: :lolg: :lolg:
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Old May 14, 2003 | 11:41 PM
  #25  
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Default Re: What increases torque? (CentralCoaster)

Now here's my question:

A 1987 Honda CRX generates 73 ft-lbs of torque. Does that mean that if he revved at me, I could jump out and grab his tire to keep his car from moving by overpowering his engine? :lol: :rofl:

Let's also say there's a fat guy on a bicycle in the bike lane next to the CRX. He weighs 230 lbs, and he's on a bike that has a 6" long pedal arm. When he stands on the pedal, will he generate more torque than the CRX? And since his power to weight ratio is much better, will he get to the next stoplight first?



[Modified by CentralCoaster, 2:20 AM 5/14/2003]
Bicycle, CRX, Bicycle, CRX...................I'll take the Bike! :lol: :lolg: :lolg: :lolg:
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Old May 15, 2003 | 05:29 AM
  #26  
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Default Re: What increases torque? (R94 LT 1)

:withstupid:
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Old May 15, 2003 | 02:36 PM
  #27  
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Default Re: What increases torque? (ScottsLT1)

CASE IN POINT I have a 600 HP engine in my KW, which is not a whole lot more than alot of cars on the road w/NOS BUT....I have 1950 ft. lbs. of torque. Torque IS work! Don't make any mistake about it. :lol: :thumbs:


[Modified by Klimper, 12:39 PM 5/15/2003]
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Old May 15, 2003 | 04:30 PM
  #28  
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Default Re: What increases torque? (black_89_vette)

How much more tq does that L98 have over the LT1? I thought it was around 5 more. I'm assuming that the area under the curve (L98) is greater down low in rpm's compared to the LT1? Somebody straighten me out.

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Old May 15, 2003 | 05:14 PM
  #29  
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Default Re: What increases torque? (HOWSER)

How much more tq does that L98 have over the LT1? I thought it was around 5 more. I'm assuming that the area under the curve (L98) is greater down low in rpm's compared to the LT1? Somebody straighten me out.
You're right that the L98 makes more low end torque (and thus horsepower) than the LT1, but it's more than just 5 lb-ft. I don't know what the real world difference is, but the last time my L98 was dyno'd, with a completely stock motor except for long tube headers, I put nearly 340 lb-ft to the ground at 2800 rpm, and was putting 320 to the ground by 1500 rpm. I've never seen a headers-only LT1 even come close to those low end numbers.
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Old May 15, 2003 | 05:47 PM
  #30  
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Default Re: What increases torque? (HOWSER)

How much more tq does that L98 have over the LT1? I thought it was around 5 more. I'm assuming that the area under the curve (L98) is greater down low in rpm's compared to the LT1? Somebody straighten me out.
The torque integral (area under curve) is greater for the LT1 across the entire band, but the torque values at low rpms is a little less than the L98's. The integral at low rpms for the L98 should be higher (say, if you measured from idle to 3000). The runners in the LT1 manifold are short and it isnt tuned for low end.

I think the advertised numbers are basically the same, 330 ft-lbs. And then they increased the LT1s to 340ft-lbs when they went to Sequential injection.

Now mind you, my STOCK 86 put down 298rwtq, which translates to more than 330 crank. However mine is an A4, so the torque converter can mess with that number a little.
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Old May 16, 2003 | 07:52 AM
  #31  
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Default Re: What increases torque? (grumpyvette)

Grumpy,
What would I do to increase the comp ratio? pushrods? The mechanic
has the heads off for a heads/cam job....
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Old May 16, 2003 | 11:59 AM
  #32  
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Default Re: What increases torque? (sothpaw2)

Changing ratio depends on variable things like gasket thickness, piston dish/dome size, and combustion chamber size.

You dont want compression over say 11.2:1 because then you might not be able to use pump gas without an octane booster.

Id try to keep it in the 10-10.5:1 range. Usually you pick a piston to get the ratio you want and leave everything else alone.
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Old May 16, 2003 | 12:13 PM
  #33  
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Default Re: What increases torque? (vader86)

What is the stock LT1 ratio, I thought it was 10:5:1?

How involved is it to replace the pistion with the heads off--
the engine is still in the car. I saw it last night.
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Old May 16, 2003 | 12:34 PM
  #34  
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Default Re: What increases torque? (sothpaw2)

He would have to take apart the bottom end to get it out, so I would just leave it alone unless your budget permits piston changes and the labor required.
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