Garrett8 Posted July 18, 2004 Report Posted July 18, 2004 the autos were rated at 200 and the 5 speeds 210 why is this and is there any easy way to get the auto to 210? Quote
EurosportZ34 Posted July 18, 2004 Report Posted July 18, 2004 That's correct for '91 thru '93 auto 3.4 DOHCs. To make yours 210HP you can swap it to a 5-speed , or you can add some performance parts. The FFP UD Pulley and Chip would put you over 210HP. Quote
99RegalGS Posted July 18, 2004 Report Posted July 18, 2004 I'm pretty sure it's just from the different compression ratio. Auto = 9.25:1 Manual = 9.5:1 Quote
slick Posted July 18, 2004 Report Posted July 18, 2004 Yep. I think i read that manuals pistons were just a bit better. I could be wrong though. Quote
Garrett8 Posted July 18, 2004 Author Report Posted July 18, 2004 so if you got the engine out of a 5speed you would have 210? Quote
slick Posted July 18, 2004 Report Posted July 18, 2004 Yeah, read here: http://www.60degreev6.com/index.php?p=pages&pid=180 Quote
Canada Posted July 19, 2004 Report Posted July 19, 2004 Anyone ever rip out there manual pistons and compare them to auto? I'm surprised a 0.25 jump in compression made 10 hp......thats about the gains from 1.0.....maybe there was a bit to be had in tuning perhaps? Quote
Vegeta Posted July 19, 2004 Report Posted July 19, 2004 I compared the pistons and found the valve relief cuts were deeper on the auto by a small amount. I really doubt .25 is 10 hp. The tuning is close performance wise, same PE fueling, same WOT spark areas. Chalk one up for GM Powertrain messin with the dyno. Its not worth looking for a 5 speed engine. Quote
White93z34 Posted July 19, 2004 Report Posted July 19, 2004 i seem to remeber reading: auto: 200hp @ 5000rpm manual: 210 @ 5200rpm (source: 1993 Chevrolet Catalog, 1991 Pontiac Catalog) not sure if 200rpm counts for 10hp or not. Quote
loominaz34 Posted July 19, 2004 Report Posted July 19, 2004 I concur. I see the same in my '92 chevy catalog. Quote
BIGBULS Posted July 19, 2004 Report Posted July 19, 2004 i seem to remeber reading: auto: 200hp @ 5000rpm manual: 210 @ 5200rpm (source: 1993 Chevrolet Catalog, 1991 Pontiac Catalog) not sure if 200rpm counts for 10hp or not. That's the thing...............the auto may very well MAKE 200hp at 5000rpm...........but by 5200-5500rpm it probably DOES make the ~210hp the manual does.............but likely around 10hp LESS to the wheels (most LQ1 auto's seem to make 160-165whp stock, where manuals make 170-175whp..............the auto's seem to make peak power a little higher [a couple hundred rpm higher] too for some reason :? ). Quote
Garrett8 Posted July 20, 2004 Author Report Posted July 20, 2004 the only thing i can think of where the autos make about 10 less is a crappier torque converter and actually maybe having to drpive power to operate the automatic Quote
excelsior Posted July 20, 2004 Report Posted July 20, 2004 could .25 compression + 200 rpm possibly be the difference? Quote
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