ok, I gave up on the N* + Caddy auto tranny (add 300lbs,. no thx) so .... believe it or not I just can't find the weight of the 3800SC ?? I got 205-215 lbs or 248lbs for the 4t65e, (so +80-90lbs or +125lbs for the tranny vs the th125c's 125lbs)
anybody can tell me PLEASE, eithe the weight of the 3800sc (no air cond.) ? or how much weight gain for this swap: 3800sc + 4t65e hd (donor car auto tranny)
thx alot Philippe
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09:58 PM
PFF
System Bot
Darth Fiero Member
Posts: 5922 From: Waterloo, Indiana Registered: Oct 2002
Kwez, on an 87 coupe you are going to tip the scales at about 2900-3000 lbs with a 3800SC/4T65-E, depending on how the car is optioned (power windows, etc). If you have a GT or SE with ground effects the weight will be slighly more.
------------------ power corrupts. absolute power corrupts absolutely. Custom Chip Burning | Fiero Engine Conversions | Turbocharging | www.gmtuners.com
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11:26 PM
May 27th, 2004
Kwez Member
Posts: 201 From: Montreal, Quebec, Canada Registered: May 2001
according to my registration, my GT weighs 2730lbs ... hmmm, that's very close to 300lbs extra ... just like the N* + Caddy tranny, damn, I'll just have to go for the manual, forget about K.I.S.S (keep it simple stupid)
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10:20 AM
May 29th, 2004
cone shark Member
Posts: 160 From: Northern, NY Registered: Jun 2001
thank you so that's 683lbs. 3800sc + 4t65e hmmm, about 200lbs extra weight ... still a bit too much for my taste. oh well, back to the original idea of also swapping in a man. trans ! (just need to decide on the engine)
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10:52 PM
May 30th, 2004
Freshj Member
Posts: 1250 From: Holly, Michigan Registered: Nov 2001
My car, 86 SE - 99 L67+4T65EHD, plus my tools in the back, me driving, 17" Audi wheels, and ~1/4 tank of fuel weighed in at 3,300 pounds... Subtract me and you get 3,000 pounds ...
Crated shipping weight of my 3800SC + 4t65e-hd was 850 lbs, but I think that was just an estimate. It feels significantly heavier than an entire transaxle combo from a Fiero, though.
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08:59 PM
Jun 16th, 2004
fieroturbo Member
Posts: 1085 From: Orefield, PA Registered: Jan 2003
Does a 4T65-E bolt into a Fiero? Or do you need new tranny mounts?
For Ecotec Fiero #2 (2 years or so down the road) I'm going auto on that, with a supercharger. The Sunfire Ecotec drag car uses that same tranny with the Ecotec (with adaptor plate of course) and they swear by that car. It's a great setup they've got.
Thanks!
------------------ PETTY OFFICER (no more airman!) Michael C Casaceli Patrol Squadron Ten, United States Navy 1988 Pontiac Fiero 2.5L, soon to be 2.2L Ecotec Turbo (THE PROJECT HAS STARTED!!!) 1988 Oldsmobile Firenza 2.0L non-turbo (R.I.P.my beloved J-body. KIA by a Ford) 1994 Chevy S-10 4.3, it's finally here, and it is gorgeous!
thank you so that's 683lbs. 3800sc + 4t65e hmmm, about 200lbs extra weight ... still a bit too much for my taste. oh well, back to the original idea of also swapping in a man. trans ! (just need to decide on the engine)
One thing that hasnt been mentioned yet, and probably just overlooked as its so basic, is the weight to horsepower ratio. Acutally, its so basic that its the only consideration here and to hassle about 200 extra pounds is meaningless once this aspect is taken into consideration. According to the Witzenburg book, the heaviest Fiero [an 87GT as my book is from the first printing] weighs in at a hefty 2708 lbs. With the 140 hp L44 the lb/hp ratio comes in at just under 20 lbs per. If you swap in an L67 at 240 hp stock, and add only 200 lbs to the car, the first level assumption is that the extra 100 hp will be devoted to overcoming the extra 200 lbs, or 2 lbs/hp. Taking this to an overall outlook, the calculation comes out to 2900/240 or just a tick over 12 lbs/hp. The only thing that the extra weight will adversely affect is handling. This can be overcome to an extent by modding the suspension to absorb the extra weight and momentum in cornering. If done correctly, you can actually benefit from the extra tonnage over your drive wheels. You'll have to consider what percentage the 4t65e consumes in driveline loss compared to the manual vs what you want to do with the car. Personally, I would go with the automatic in a 1/4 mile application as the gains from having constant power to the wheels throughout the shifting sequence outweighs the added driveline loss. Also, some engines are better suited over others for increasing horsepower. The L67 is fast becoming the 'SBC' of the V6 world where aftermarket parts and other mods are concerned. Just something to consider in making your decision.
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