CutlassSL91 Posted June 2, 2005 Report Share Posted June 2, 2005 Do you think it would be worth it to switch a 3.1 MPFI to a 3400 185hp V6? Is this a pretty simple swap or a lot involved? would a 1991 4-T60 NON ELECTRONIC trans work with it? The 3.1 is a great smooth quiet running engine but it's too slow. A turbo would probably be more work that i'd like. Quote Link to comment Share on other sites More sharing options...
94CutlassSLCoupe Posted June 2, 2005 Report Share Posted June 2, 2005 i'd say it would be pretty easy but you'd have to run it with the 3.1 MPFI's electronics and a custom chip...not sure what the wiring difference would be though. Quote Link to comment Share on other sites More sharing options...
Brian P Posted June 2, 2005 Report Share Posted June 2, 2005 It takes a bit of work on the older W-cars but if you can get the parts cheap from a junkyard and have the car hung up a few days, I say go for it. Quote Link to comment Share on other sites More sharing options...
CutlassSL91 Posted June 2, 2005 Author Report Share Posted June 2, 2005 I should probably ask a bunch of questions about the 3400: Does it have about the same sound as the 3.1 MPFI (good "dual" exhaust sound magnaflows?) It it as smooth? Reliable? Will I notice a good amount of increase in performance? Quote Link to comment Share on other sites More sharing options...
GutlessSupreme Posted June 2, 2005 Report Share Posted June 2, 2005 Most pushrod V6s have generally the same sound.. can be nice and deep in the lower rpms with the right (or lack of) exhaust, but it loses the deep tone once you get past 3300ish rpms. And it's generally accepted that any GM 60* V6 is pretty damn smooth and reliable. and you'll DEFINETLY notice a boost in performance from a '91 3.1... I'd go for it. Quote Link to comment Share on other sites More sharing options...
CutlassSL91 Posted June 2, 2005 Author Report Share Posted June 2, 2005 And the 3400 will hook up to the 4T60 (NOT E)? Quote Link to comment Share on other sites More sharing options...
gp90se Posted June 3, 2005 Report Share Posted June 3, 2005 very simple, the 4t60 will bolt to the 3400, u will need a chip from a 90 w-body (3.1 mpfi / 4t60 without a MAF sensor), and 2 rewire the SFI to run as MPFI, there is a very good writeup about how to do it if you use a search. I would suggest using a stronger transmission the the stock 4t60 from the 3.1, either a TGP 4t60HD or a 4t60E froma 3.4 car or converting to a manual transmission. Quote Link to comment Share on other sites More sharing options...
patgizz Posted June 3, 2005 Report Share Posted June 3, 2005 and it still won't run for shit on a 3.1 chip... you need to be versed in chip programming to be able to take it to someone who is. Quote Link to comment Share on other sites More sharing options...
luminator94 Posted June 4, 2005 Report Share Posted June 4, 2005 Depending on what type of car your getting the engine from, a stock 3400 is rated anywhere from 170-180HP. I'm just being picky. Aaron Quote Link to comment Share on other sites More sharing options...
THe_DeTAiL3R Posted June 4, 2005 Report Share Posted June 4, 2005 http://3100mpfi.com <- guy who put a 3100 in his car and used the 3.1 computer Anyways I notice the 3400 is a pretty peppy engine. In the IMPALA, a big car, it feels faster than the 3100 in my GP. As far as exhaust, nothing quite has the same sound as the 2.8/3.1. That's why I always loved flooring my 1988 GP so much, I really don't drive my current car that hard at all... Quote Link to comment Share on other sites More sharing options...
CutlassSL91 Posted June 4, 2005 Author Report Share Posted June 4, 2005 How diccucult would this project be and what would the total cost be? What could I get for my 3.1 and 4T60 Trans? Quote Link to comment Share on other sites More sharing options...
gp90se Posted June 4, 2005 Report Share Posted June 4, 2005 you wount get more then a couple hundred for a 3.1/4t60, hard to sell. its a bolt in job but if patgizz says u need a custom chip, that will run ya some $$. Quote Link to comment Share on other sites More sharing options...
Canada Posted June 4, 2005 Report Share Posted June 4, 2005 Check out http://www.3400swap.com too. The 3400 (LA1) is a pretty soild engine....it does have the intake leak problem like the 3100 and MPFIs do. Hell, intake leaks are pretty much known GM wide. You can pick the engines up pretty cheap.....I paid $345 for a 3k mile off eBay. I went from a 15.8 @ 87 to a 15.2 @ 90 mph....everything else being the same. 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.