w-bodys_are_the_best Posted April 25, 2007 Report Share Posted April 25, 2007 From what I've read the auto LQ1's are governed down in horsepower compared to the ones that came with the 284 5-spd. Is this all done by the ECM? For example if I swap an LQ1 from an auto into my 91 CS International with the 284 in it and use my CS ECM, is that motor still going to be governed down? Quote Link to comment Share on other sites More sharing options...
Crazy K Posted April 25, 2007 Report Share Posted April 25, 2007 "governed" by the chip, unless you mean the motor is plum built to a different specification. Quote Link to comment Share on other sites More sharing options...
slick Posted April 25, 2007 Report Share Posted April 25, 2007 Same engine minus the AIR setup. I've read the possible difference in HP and TQ may be from piston differences. Not sure if this is confirmed or not. Quote Link to comment Share on other sites More sharing options...
Z34-5speed Posted April 25, 2007 Report Share Posted April 25, 2007 What does the AIR setup even do??? The 5speed supposedly has 10 more hp but the same TQ. I thought i read somewhere the 5speed motor has .5 more compression. That's why i'm holding out on getting a new motor b/c i'm afraid it will be an auto motor and i would have been better off keeping this one. Quote Link to comment Share on other sites More sharing options...
slick Posted April 25, 2007 Report Share Posted April 25, 2007 What does the AIR setup even do??? The 5speed supposedly has 10 more hp but the same TQ. I thought i read somewhere the 5speed motor has .5 more compression. That's why i'm holding out on getting a new motor b/c i'm afraid it will be an auto motor and i would have been better off keeping this one. The compression comes from the pistons, as mentioned above. The AIR system IIRC is part of the emissions. Again, the compression thing and the piston thing may be a myth, may be true. Quote Link to comment Share on other sites More sharing options...
jeremy Posted April 25, 2007 Report Share Posted April 25, 2007 From what I've read the auto LQ1's are governed down in horsepower compared to the ones that came with the 284 5-spd. I am not sure what the 5spds were rated at, but I know that mine is rated at 215hp from the factory Quote Link to comment Share on other sites More sharing options...
slick Posted April 25, 2007 Report Share Posted April 25, 2007 The 96-97's are rated higher than the previous models. Quote Link to comment Share on other sites More sharing options...
5speedz34 Posted April 25, 2007 Report Share Posted April 25, 2007 The 91-93 5speed motors have different valve reliefs. They are deeper causing for the bump in compression. If I was rebuilding a motor I would not mess with holding out for a 5speed one. 10hp is a minimal difference and if you are that worried about it you can pick it up else where. The difference in the 5speed motors are the AIR system, and the pistons. Ohh and the rev to 7k. Other than that nothing. I don't remember the exact hp numbers. But I think the 96-97 motors have 5hp over the 5speed engines. Like I said before differences are minimal. Quote Link to comment Share on other sites More sharing options...
slick Posted April 25, 2007 Report Share Posted April 25, 2007 Tony, I have read that the 91-93 cams are a bit more lopy-er than the 94-95, and 96-97 cams. Might be something to keep in mind if you are ever building a 3.4 and using stock cams. Someone on 60* had several cams sent out to be spec'd. Quote Link to comment Share on other sites More sharing options...
ismellrealbad Posted April 25, 2007 Report Share Posted April 25, 2007 i gotta say i dont know any fact about this. but my opion is its gotta be tq converter vs a direct connection from crank to pavement (clutch). a torque converter tranfers power thru fluid unless its locked up. theres gotta be some power loss thru that. Quote Link to comment Share on other sites More sharing options...
joey b Posted April 25, 2007 Report Share Posted April 25, 2007 crank HP is irrelevant to torque converter The difference is due to compression difference. Manuals were 9.5:1 and autos were 9.25:1. 96 and 97 were 9.7:1 Quote Link to comment Share on other sites More sharing options...
Andrew Posted April 25, 2007 Report Share Posted April 25, 2007 i gotta say i dont know any fact about this. but my opion is its gotta be tq converter vs a direct connection from crank to pavement (clutch). a torque converter tranfers power thru fluid unless its locked up. theres gotta be some power loss thru that. remember, engine ratings are talking about hp to the flywheel, not to the wheels. transmission is irrelevent. and i learned something new today. i always wondered what made them different. thanks tony! Quote Link to comment Share on other sites More sharing options...
ismellrealbad Posted April 25, 2007 Report Share Posted April 25, 2007 yea ur right...i thought he was just talking about 5spd being quicker in general Quote Link to comment Share on other sites More sharing options...
w-bodys_are_the_best Posted April 25, 2007 Author Report Share Posted April 25, 2007 The difference in the 5speed motors are the AIR system, and the pistons. Ohh and the rev to 7k. Other than that nothing. Will there be any problems with the air system, or does that have to be removed? I thought my 91 CS 284 only went to 6500 RPM, I could be wrong, I've only drove it 3 times since I had it, and only pushed it once, and even then I didn't go past 6000 RPM. Quote Link to comment Share on other sites More sharing options...
Heza Posted April 25, 2007 Report Share Posted April 25, 2007 the manual lq1s had 210 hp and 215 tq and autos were 200/215 before '94. then '94-95 auto lq1s were 210/215. then '96-97 lq1s were 215/215. AIR is a system that injects fresh air into the manifolds via a pump in front of the passenger front wheel during the first moments after startup to provide more oxygen for cleaner emissions. then, the AIR (whatever the damn acronym for it is) pump stops working and thats pretty much it for that system. i think, however, it does kick in a few random other times, but not exactly sure when because i can hear the AIR pump in my car run for a second or two every now and then post startup period. Quote Link to comment Share on other sites More sharing options...
jeremy Posted April 29, 2007 Report Share Posted April 29, 2007 The difference in the 5speed motors are the AIR system, and the pistons. Ohh and the rev to 7k. Other than that nothing. my auto has a 7k redline too Quote Link to comment Share on other sites More sharing options...
19Cutlass94 Posted April 29, 2007 Report Share Posted April 29, 2007 Does it shift at 7,000RPM though?! I would almost think the computer would control the shifting to around 6,000RPM.... Quote Link to comment Share on other sites More sharing options...
BIGBULS Posted April 29, 2007 Report Share Posted April 29, 2007 The manual trannied cars have a 7K rpm marked redline AND a 7K rpm rev limiter. The auto trannied cars are still MARKED at 7K, but the rev limiter is at 6700rpm or so IIRC (somebody go ask Ben on 60deg....), and left to it's own devices, the tranny will shift at 6200-6300rpm for 1-2, slightly less for 2-3 and 5000-5200rpm for 3-4.................NOT exactly conducive to maximum performance. I would make a point though, that max effort acceleration for a manual trans car does NOT involve wrapping it out all the way to redline though..............6500-6600rpm for 1-2 and 2-3 and then hold 3rd through the traps in the 1/4. Auto cars have no way to manually hold 1st (it still shifts, even locked into "1"), but you CAN hold off the 2-3 shift (using "2"), and it's usually worth a tenth or so and 1-2mph (vs letting it shift into 3rd 100-200ft before the line). Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.