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l98 vs LT1 vs Ls1

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Old 03-04-2005, 07:51 AM
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Default l98 vs LT1 vs Ls1

Of course the L98 245hp < LT1 275hp < Ls1 310hp, but how would you compare the power of the engines at low RPM? People say the LT1 has more low end grunt than the LS1, but what about the L98? I'd like to hear from people who have drive all three motors.
Old 03-04-2005, 08:07 AM
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I have had all three, and I would say that the L98 has the most torque down low but it seems to run out of steam the quickest. They were rated at 345tq from the factory.
Old 03-04-2005, 08:35 AM
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Driven/owned all three here...

The L98 was severly limited because of the intake design (upper RPMs) and the automatic transmission. The LT1 is a very noticable difference, and IMO has a lot more down low right off of idle than the LS1. The LS1 though, comes on strong, and doesn't give up.

So what I'm saying is, with time and technology, the best of the best is what is available now.
Old 03-04-2005, 08:49 AM
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MY GTA would pull hard through first and second, but third gear it would fall flat on it's face. That car hooked really well, never spun just took off. My fathers 95 Formula would pull hard all the way through, reved higher and just felt more powerful where the L98 fell off(around 4500). The LS1 hands down the best of the three.
Old 03-04-2005, 12:54 PM
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I've driven all three, owned just an LS1. From what I can remember from the seat of the pants meter the L98 didn't feel as strong down low as the LT1 and LS1 did. The one I drove was an '89 IROC with 2.73's though. What other gear ratios came with the L98 motor?
Old 03-04-2005, 03:44 PM
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Originally Posted by Martingale
The one I drove was an '89 IROC with 2.73's though. What other gear ratios came with the L98 motor?
2.77 and 3.27 were the only gear choices for the L98 in the IROC-Z. This was with the BW 9 bolt. In 91 (some 90's too) they went back to the 10 bolt and Z28 moniker, so it was then 2.73 and 3.23.

The 305 LB9 mated to a 5 speed could be had with 3.08 or 3.45 gears. 3.08 and 3.42's were then the choices when it went back to the 10 bolt.

Last edited by DMNSPD; 03-11-2005 at 08:57 AM.
Old 03-04-2005, 04:18 PM
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I also have owned all three: 2 GTAs, 2 1993 Z-28s, 1 2001 Z-28. I agree with the general consensus: 1) the L98 was very torquey but would fall on its face above 4000 rpm--1/4 mile: 15.2 @ 93. 2) The LT1 was also very torquey down low and would pull hard through the midrange and would then fizzle out around 5000 rpm--1/4 mile: 13.9 & 14.1 @ 100. 2) The LS1 has more than enough torque down low, but also has tremendous midrange and top-end power. Pulls strong all the way to 6000 rpm--1/4 mile: 13.0 @ 110.
All 1/4 mile times are with bone stock vehicles.
Old 03-04-2005, 05:48 PM
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my l98 did feel strong from a stop.



compared to that car and other lt1s i drove it doesnt come close to my ls1 stock or comparably modded.
Old 03-04-2005, 09:19 PM
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LS1 is the best motor of all three...but if you want to go fastest for the cheapst..LT1 is a better bet for a car/motor. Lt1 cars are so damn cheap now adays I don't even see a price difference worth going to the L98 cars to mod into the 10's.
Old 03-05-2005, 08:42 AM
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Nothing can compare to the tree pulling low end torque of a L98..if people tell you otherwise they're on crack. Just like everyone else stated the L98 will fall flat on it's face over 4K or so.

The L98 is still a great, reliable street car motor.
Old 03-05-2005, 09:42 AM
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All 3 highly reliable motors that are easy to mod. Speed is all in the checkbook
Old 03-08-2005, 04:45 PM
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Originally Posted by Blackbird5.7
Of course the L98 245hp < LT1 275hp < Ls1 310hp, but how would you compare the power of the engines at low RPM? People say the LT1 has more low end grunt than the LS1, but what about the L98? I'd like to hear from people who have drive all three motors.
L98... what is this?
Old 03-08-2005, 04:49 PM
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Originally Posted by DeViOuSoNe
L98... what is this?

5.7L TPI The best truck engine GM never made.....
Old 03-08-2005, 05:01 PM
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Originally Posted by 87f383
5.7L TPI The best truck engine GM never made.....

LOL, isn't that the truth.
Old 03-08-2005, 05:11 PM
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Originally Posted by Frosty
LOL, isn't that the truth.
The trucks were TBI (88-95). These were in the vette and 350 3rd gen's.

IN my opinion LS1>LT1>L98
Old 03-09-2005, 09:24 AM
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Originally Posted by 87f383
5.7L TPI The best truck engine GM never made.....
Funny. I have often wondered how a L98 would have fared in a 4wd as opposed to the underpowered TBI.
Old 03-09-2005, 09:44 AM
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Modded L98 + 4.10's == stump puller. Too bad my '90 didn't have a hitch, I could have pulled a 5th wheel.
Old 03-09-2005, 10:30 AM
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Originally Posted by 87f383
5.7L TPI The best truck engine GM never made.....
Thanks!
Old 03-09-2005, 10:59 AM
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Originally Posted by DMNSPD
Funny. I have often wondered how a L98 would have fared in a 4wd as opposed to the underpowered TBI.
Yeah, they should of switched to the L98. That would of been a mean truck motor.
Old 03-09-2005, 08:57 PM
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Originally Posted by SmokingWS6
Yeah, they should of switched to the L98. That would of been a mean truck motor.
I guess that's what the Vortec engines were for in 96.


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