diff. btw LT1 93 to 97?
diff. btw LT1 93 to 97? 
05-10-2004, 03:30 PM
#2
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I don't think there were any mechanical differences in the LT1's over the years. Maybe some minor tweaks though. The HP rating on the cars themselves change in 1996 due to catalytic converter changes. Went from 275-285. Thats about it as far as I am aware.....
05-10-2004, 03:36 PM
#3
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yeah 93s were speed density, dont respond as well to mods, 95-97 had the vented optispark distributor which helped them last longer, only difference in hp was when they switched to the dual catted ypipe in 96 i believe that gave it 10extra hp, from 275hp to 285hp.
05-10-2004, 03:53 PM
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There were actually quite a few differences...
The intake manifold on the 92-93 LT1 only had a single crossover for the fuel rail (hence the manifold and fuel rails are 'unique'). The throttle bodies are also slightly different (kickdown cable for the A4 trans).
The 93 F-body exhaust manifolds were different than the 94-95 single cat cars.
Some 95 cars got dual cats, but all 95s were OBDI.
The optispark was non-vented in 93-94 and went vented in 95. I've heard of just as many 'later' failures as earlier - this is no advantage IMO. Roll the dice.
93-94 had the same timing cover. 95 had a different timing cover (with no crank position sensor). 96-97 had a timing cover with the crank sensor.
94-95 knock sensor was different from 96-97. Of course the ECMs / PCMs are different - 92-93 had a removable EPROM style, 94-95 was flash OBDI, 96 and 97 were flash OBDII.
That's about all I can remember off hand...
The intake manifold on the 92-93 LT1 only had a single crossover for the fuel rail (hence the manifold and fuel rails are 'unique'). The throttle bodies are also slightly different (kickdown cable for the A4 trans).
The 93 F-body exhaust manifolds were different than the 94-95 single cat cars.
Some 95 cars got dual cats, but all 95s were OBDI.
The optispark was non-vented in 93-94 and went vented in 95. I've heard of just as many 'later' failures as earlier - this is no advantage IMO. Roll the dice.
93-94 had the same timing cover. 95 had a different timing cover (with no crank position sensor). 96-97 had a timing cover with the crank sensor.
94-95 knock sensor was different from 96-97. Of course the ECMs / PCMs are different - 92-93 had a removable EPROM style, 94-95 was flash OBDI, 96 and 97 were flash OBDII.
That's about all I can remember off hand...
05-10-2004, 09:06 PM
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The older....ie 93 and 92 LT1's also sometimes had the two tone interior and
the speed density as mentioned above. Also they dont have the plethora of modifications as 94-97 LT1's. And they won't be as fast as also stated. There is way more out there for 94 and newer LT1's, however the 93 can be worked on for a price FYI- the LT4 parts are not interchangeable with the 93s
the speed density as mentioned above. Also they dont have the plethora of modifications as 94-97 LT1's. And they won't be as fast as also stated. There is way more out there for 94 and newer LT1's, however the 93 can be worked on for a price FYI- the LT4 parts are not interchangeable with the 93s
05-10-2004, 09:26 PM
#7
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There is not as much out there for the Speed Density cars as there is for the MAF cars, but there is still a fairly large aftermarket available. It's not like you won't be able to find a set of heads or a cam for a 92 or 93 LT1.
92-93s had a 4L60, which is hydraulically shifted, pretty much the same as a 700R4. They also had different gearing, I believe the T-56 had 2.73 gears.
92-93s had a 4L60, which is hydraulically shifted, pretty much the same as a 700R4. They also had different gearing, I believe the T-56 had 2.73 gears.
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05-10-2004, 09:27 PM
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the 92-94 LT1 had most of the differences above BUT the main differences were the cam snout with the splined opti. both take well to performance mods you definitly want to change over ot the late style opti when doing mods. the LT4 heads were the best you can use for this engine buildup. it is true the 94 and up are easier to mod the PCM and consequently take to mods due to them having a MAF. 97 was OBDII and they are more sensitive to mods due to more sensors. the LT series engine makes great power as compared to the L98 series but the LSX engines are way more responsive to power increases with the same mods.... i hate to say it but comparing my 383 LT4 to my stock bottom end LS6 the power levels are negligible especially when you compare the dollars for performance level... BUT there is somehting to be said for a LT engine laying the smack down to an LS1... they are out there.. just not that prevelant...
05-10-2004, 09:47 PM
#9
I have never seen a post with SOOOOO MUCH misinformation! ( the first few responses)
IF anything there can be a STRONG STRONG point that the 93 is the strongest and quickest out of the bunch. The ONLY real disadvantage on a 93 is the Programming is on a chip instead of reflashable from the port and misinformation like this.
93 was speed density had a 700R4 or tech a 4L60 transmission or a M28 or M29 tranny with different gear than the newer cars. The M29 had a gear setup similiar to Z06's (2.97 first) so you don't want to run 4:11's with em.
22# injectors, intake is different only one coolant crossover if I remember right.
94 s had the same sealed opti setup but MAF
95 was the year ODBI single cat exaust and vented opti.
96-97 ODBII and dual cat. In 97 they changed the interiors to the newer style you see in LS1's.
If I was buying another LT1 I'd go for a 95 then 97(interior) then 93. But really if I found a 94 in better condition I'd buy it.
Quit the 93 hatin!!!! Mine ran 12.6's on a hot cam and HOME ported heads!
IF anything there can be a STRONG STRONG point that the 93 is the strongest and quickest out of the bunch. The ONLY real disadvantage on a 93 is the Programming is on a chip instead of reflashable from the port and misinformation like this.
93 was speed density had a 700R4 or tech a 4L60 transmission or a M28 or M29 tranny with different gear than the newer cars. The M29 had a gear setup similiar to Z06's (2.97 first) so you don't want to run 4:11's with em.
22# injectors, intake is different only one coolant crossover if I remember right.
94 s had the same sealed opti setup but MAF
95 was the year ODBI single cat exaust and vented opti.
96-97 ODBII and dual cat. In 97 they changed the interiors to the newer style you see in LS1's.
If I was buying another LT1 I'd go for a 95 then 97(interior) then 93. But really if I found a 94 in better condition I'd buy it.
Quit the 93 hatin!!!! Mine ran 12.6's on a hot cam and HOME ported heads!
Last edited by 93TAWicked1; 05-10-2004 at 09:54 PM.
05-10-2004, 10:04 PM
#11
I don't know why the 93 would be quicker than any other years. But it is unique in many ways from the 94-97 cars, as mentioned above: speed density, chip instead of PCM, non-electronic auto tranny, mechanical speedo, different manual trannies, etc. Many LT1 enthusiasts feel the 95 is best because of the later opti (though they DO seem to fail as much as the earlier ones, they are cheaper), and the OBD1 programming. OBDII came on in 96. I had two 94s and loved them - except for the cursed optispark.
05-10-2004, 10:09 PM
#12
LOL Thats why I said Argueably.. The M29 z28 with cam with 3.23 gears, and alot of them ran really good times. Plus contrary to what has been said the 93 respond GREAT to mods such as exaust and intake without programming. The only real problem was the getting the programming done.
Also you could use a paperclip to get your troublecodes
But yes they are all pretty equal I never had problems with the opti with my 93 nonvented or the 95 vented I converted it too. Probably why I like the LT1 everyone else hates it because of the opti
Also you could use a paperclip to get your troublecodes
But yes they are all pretty equal I never had problems with the opti with my 93 nonvented or the 95 vented I converted it too. Probably why I like the LT1 everyone else hates it because of the opti
05-11-2004, 06:58 AM
#13
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Ok I guess I left out a few things .
Wow I thought I knew my fbodies......do you guys have any life outside of cars (hehe). I did say there were minor changes though. I had no idea the 93 engine was the "bas-ard" of the group though.
.Wow I thought I knew my fbodies......do you guys have any life outside of cars (hehe). I did say there were minor changes though. I had no idea the 93 engine was the "bas-ard" of the group though.
05-11-2004, 09:48 AM
#14
I'd also agree that the 93 isn't as terrible as some people think. Speed Density cars run a lot better than mass air cars until major mods start to pile up. Once you start doing internals, it's probably about time to learn how to do some chip tuning. Most majorly modified cars switch to the older speed density systems because of all the flexibility with the computer and chip burning. Just check out thirdgen.org.
Remember, all 90-93 Camaro's, Firebird's, and Corvette's were speed density.
Remember, all 90-93 Camaro's, Firebird's, and Corvette's were speed density.
05-11-2004, 02:20 PM
#15
Wasn't the 93 Vette MAF??? In fact almost sure it was.... The 92 LT1 vette motor and the 93 LT1 F-body motor are essentially the same. (except for the 4 bolt mains) and yes I have no life I've own 5 4th gens and spend WAAAAAAAY too much time on them!
05-11-2004, 02:36 PM
#16
Originally Posted by 93TAWicked1
Wasn't the 93 Vette MAF??? In fact almost sure it was.... The 92 LT1 vette motor and the 93 LT1 F-body motor are essentially the same. (except for the 4 bolt mains) and yes I have no life I've own 5 4th gens and spend WAAAAAAAY too much time on them!
