Help with a 3800 supercharged Fiero swap
11-03-2008, 08:02 AM
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Help with a 3800 supercharged Fiero swap I'm in the planning stages of my next project. I want to install a Pontiac 3800 supercharged V6 in a Fiero. Although I've found much info on the swap it's self, I can't find much info about modifying the motor. I know there are smaller pullies, intercoolers, cams etc out there but I'm really looking for a good web site or furum to check out.
P.S. I know the LS motors will fit in the FIero too. I'm not looking to go that route. Plus I can sneak a V6 past the guys at DMV whern I register it as a classic. (classic = no inspection)
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P.S. I know the LS motors will fit in the FIero too. I'm not looking to go that route. Plus I can sneak a V6 past the guys at DMV whern I register it as a classic. (classic = no inspection)
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11-04-2008, 07:37 AM
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Just a sugestion, since you are doing a swap anywho, get a 3.25", headers, tune and a N* tb/adaptor plate (from brian teel on clubgp dot com) which comes pre-tapped for Nitrous/Alky injection and PCV. Using the LQ4 maf and tables will get you well into the mid 300hp levels. My '99 Grand Prix GTX dyno'd at 375ish WHP at 700ft with that plus a couple other odds and ends
. Pushed a 3400lb car to mid-high 12's but my car was known as a factory freak tho! If you plan on doing a mild ZZP cam, you can drop to a 3" but any more than that you'll need to do head work. Dropping to zzp's XP-HOT or XPZ will net serious gains however mod'd retainers and LS6 springs are required. XPZ might need clearencing as well as porting to net proper gains.
There are many owners that dyno into the 400hp range with a cam/pulley swap! It's like anything else...how deep is your pocket book.
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11-04-2008, 04:04 PM
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Thanks a lot. A mild cam is definately in the cards, as well as headers. The stock manifolds are very restrictive when used in a Fiero so they have to go. Hopefully the numbers you got are close to what I'll see as that is more than I figured I'd get. The project is only in the planning stages as I can't get serious till next spring or so. Currently I'm casually looking for a cheap car to start working on the body/interior.
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11-04-2008, 07:34 PM
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Also if you didnt want to go through the effort to swap in a cam(thought itll be easier since the motor is out) you can go with a full size intercooler and 1.9 modified rockers, that with the headers and a ported blower should get you well past your goal but keep a stock idle if you want to really surprise some people.
11-04-2008, 09:43 PM
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Also if you didnt want to go through the effort to swap in a cam(thought itll be easier since the motor is out) you can go with a full size intercooler and 1.9 modified rockers, that with the headers and a ported blower should get you well past your goal but keep a stock idle if you want to really surprise some people.
I'm installing a cam in it, no doubt. The Stealth II I installed in my LS1 made a major difference, I can't pass that up. Also, like you said it real easy to swap a cam with the engine out of the car.
How would you do a traditional intercooler on these engines. The blower is bolted right to the intake limiting your options. I've seen the air to water intercooler installed in the intake but that set up is expensive.
11-04-2008, 10:46 PM
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Thats the only type of intercooler setup for those motors so its that or use alk sprayed through the blower but that eventually eats away at the coating on the rotors and is less effective. Actually its a plate type system where the intercooler is mounted between the lim(intake) and the blower.
11-05-2008, 07:38 AM
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Thats the only type of intercooler setup for those motors so its that or use alk sprayed through the blower but that eventually eats away at the coating on the rotors and is less effective. Actually its a plate type system where the intercooler is mounted between the lim(intake) and the blower.
Depending on the "alky injection" you use, there is by no means any compromization of the teflon coating on the rotors. Teflon gets "eaton" away by wear and tear and the use of certain alcohols will aid in that process however the typical watered down blue windsheild washer fluid does not eat away at the coatings any more that just wear and tear. Pure uncut methanol, well.......
The plate system intercooler is effective however, for your hp expectations, the intercooler is somewhat useless, or not required. once you start pushing major mods and having issues with knock then you can start talking coolers.
Alcohol injection is actually very effective if you do not want to add 3" to the height of your engine. It will keep the blower very cold and reduce knock. If you start playing around with pure methanol, it actually works as a fuel suppliment thus being harder to tune without a controller.
Knock is the killer of the 3800. Mild cam, headers and not too vigerous pulley will safely attain the HP levels you want without the use of any "intercooling" system. My car was not intercooled and on 90* days I still wouldn't see any knock with good pump fuel.
11-05-2008, 09:27 PM
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Good info. I don't think I will be going the injection route as I don't want to be worrying about having to keep it full or problems that may arise from it going empty. My current plans are a cam in the low 220s @ .050 duration w/LSA around 115deg(+ springs & RRs), headers with a 3" exhaust, a pulley (probably 3.25" or thereabouts), and of course dyno tunning. If I can put over 310-320ish to the rear wheels I'll be tickled to death. My main worry is how the M5 Getrag will hold up.
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11-12-2008, 04:06 AM
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Question. In my searching I heard about a M6 used in the Pontiac G6. Anyone know if this will bolt up to the 3800 or not. If not, anyone make an adapter??
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11-12-2008, 06:44 PM
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Don't quote me on this but the G6 uses the new 3900 which IIRC has a different bolt pattern. If you can find a getrag out of a cavalier, I think that is your best bet. I've heard of these being used before.
