I own a 80 Sport Coupe and I have seen T types and GN's pull 12's and 13's with very little modifying. Just think our fieros weigh half as much how fast would it go then? I have heard very good things about these motors I have personnaly talked to a guy who runs 13's with alcohol injection and still gets 38 mpg! I dont know the getrag would stand this insane power long but sounds like a cool swap to me. Have any forum members installed a intercooled 3.8 turbo engine? Got any pics I could see?
------------------ Stock 85 GT 4 speed 2.8
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12:25 PM
PFF
System Bot
l_bilyk Member
Posts: 133 From: Mississauga, Ontario, Canada Registered: Jan 2002
or there is always the option of just doing a newer 3800 series II s/c, those are becoming somwhat popular. and with just a few mods they can pull 12 second runs... just talk to fieroX or bengal4. (there are many other members, but can't think of names right off the top of my head)
-Fish
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09:38 PM
Oct 7th, 2002
WikedV6 Member
Posts: 271 From: Elburn, IL USA Registered: Jul 2002
I am currently in the process of building exactly what you were asking, I wanted a 5 speed with a turbo 3.8 motor out of a Buick GN .I was going to convert the Fiero into a Diablo down the line. However, after further reaserch, I found out that I may run into problems with the Getrag and the clutch.(looking to make 400+HP & 500+lbs TRQ). I decided that I will use a Porsche G50 trans which is probably the strongest manual trans for the amount of torque this motor will be putting out.Since I have two Fieros, I will be using one for the Diablo project(85 SE) with (Porsche Trans and 3.8 Turbo six motor) and the other Fiero(87 SE), I will be building it with an auto trans which will work better with the turbo setup especially with a 5500 RPM red line motor.I am looking to get more information on auto trans like the 4T60 Troy Ritchies has in his car( atleast that is what I was told by one of the board member). My trans guy that builds all my trans for the buicks said he will be able to beef-up a FWD trans for my purpose.I realy wanted to do this with the Getrag but since I will have the other Fiero for the Diablo, I wanted to build a Fiero with the optimum preformance.I rebuild and restore Turbo buicks as a hobby, If you have any questions about those motors I will be more than glad to answer all of your questions. 38 mpg seems too high, may be 28. I get 24mpg on my GN that runs 10.70's 124mph and weights 3800lbs plus.
Good luck
Prasad
------------------ 87SE 2.8 w/5speed(waiting for a 3.8 Buick GN setup trasplant) 85SE 2.5 w/5speed 1987 Buick GN(10.70@124MPH) 1987 Turbo T 1992 GMC Typhoon Other cars; JaguarXJ6, AMG 500SEL,Astro & Legacy
Wow that is one fast car! Hey I would like to see some pics as you get things together I think this is the motor I will look for for my 85. I plan on switching the manual 4 speed to a auto. That way I can build boost witout frying a clutch! I wount go as hig as you looking for around 13's at 350 hp. That way it is still reliable for cruising. Do you plan on using a intercooler? Any idea where to mount it? I have a 80 Sport Coupe but it is missing the turbo motor has a 305 But I can see why people like these cars. Heres a pic
------------------ Stock 85 GT 4 speed 2.8
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01:43 AM
G-Nasty Member
Posts: 2099 From: woodlands,TX,USA Registered: Jan 2001
My dads got an '87 T-Type...the things hauls some serious A$$...I would love to have that engine in a Fiero...Im sure you could pull 11 or 12s no problem. I dont think it would work too well with the manual tranny...the turbo lag would slow you down a lot between shifts.
If anybody is doing a 3.8 Buick Turbo conversion, I would strongly suggest that you would look into an 86 or 87 motor they are Intercooled) the intake manifold, exhaust manifod and the valley of the block are designed better. 86-87 are the best and the fastst years. The 84-85 motor is ok anything below 84-85 motor might not be as strong.The only difference between a T-type,Turbo T and a Grandnational is that; all the Grandnationals are black with special rims (86-87 had the crome with turbo6 centercap)and the interior, all the GNs had the gray and black seats with the power six logo on the headrest. some 84-85 GNs came with the "Lear Seagler" leather seats. T types, Turbo T's could be any color any color interior and aluminum wheels. THE POWER TRAIN IS EXACTLY THE SAME.Most people think that T types and Turbo Ts are non turbo and slower than a GN NOT TRUE. If anything they should be faster in theory because they have the same powertrain as a GN but they are lighter due to Aluminium bumbers,drums,wheels etc.I first bought my Fiero(85SE) with the five speed Isuzu then I was told the Getrag is stronger, so I bought the second one(87SE) with the Getrag, now Getrag is blowing up behind the tourqe of the V8's. Again I am on the hunt for an auto trans. I want to use the trans like Troy Ritchie's 4T60.Initially I was going to use a motor out of an 87 Bonneville with VIN code #3 which has the roller cam setup. the crank is very similar to the the GN, they both have the fillet rolled,the rods are the same, all I had to do was put forged pistons or turbo pistons with 8.5 to 1 compression, That motor will bold right up the Fiero trans of course custom flywheel if I was going with a stick.More and more I research, I get more confused on what I should do, I wanted it to be reliable. Only concern I have about the Bonneville block is, if it is stong enough. I just may stick a GN motor I have sitting around . No matter what trans I use, I still have to rebuild it to make it strong.As far as Intercooler goes, I am going to stick with air to air and more than likely on top of the motor or the trunk in the back with a special hood scoop and a high CFM fan.If I go with liquid cooled IC, I still have to find a way to cool the condersor that cools the liquid.so anyway I need air cooling back there.Once I make up my mind about the trans and which block to use, I will start the project and keep you guys informed with the updates and pics.
Prasad
------------------ 87SE 2.8 w/5speed(waiting for a 3.8 Buick GN setup trasplant) 85SE 2.5 w/5speed 1987 Buick GN(10.70@124MPH) 1987 Turbo T 1992 GMC Typhoon Other cars; JaguarXJ6, AMG 500SEL,Astro & Legacy
But I can see why people like these cars. Heres a pic 
FURIOUS FIERO 
