Mach 5 Posted November 4, 2006 Report Share Posted November 4, 2006 Would these work on a 3.1 or would the ignition system kill it? I figured that since my dad was happy with these on his car (2003 Mini Cooper S), that these might be good on mine. Im hoping this will give me better gas mileage as I get 14mpg. His car went up from 30 to 37 on his. http://www.ngksparkplugs.com/products/cars_trucks_suvs/iridiumix.asp?nav=11420&country=US Quote Link to comment Share on other sites More sharing options...
digitaloutsider Posted November 4, 2006 Report Share Posted November 4, 2006 There's no point in using that expensive of a plug in a lowly little 3.1. Just use the plain AC Delco's. You shouldn't see that much of an increase in gas milage unless the ones in there are in pisspoor condition. Quote Link to comment Share on other sites More sharing options...
Euro Posted November 4, 2006 Report Share Posted November 4, 2006 yeah, go with AC Delco, but if you wanna feel "performanc-y" then get the Rapidfire's Quote Link to comment Share on other sites More sharing options...
19Cutlass94 Posted November 4, 2006 Report Share Posted November 4, 2006 I find it hard to believe that he got 7 miles more to a gallon by just changing plugs. Get the $1.50 AC Delco copper plugs. Theres no point in buying such expensive plugs. Quote Link to comment Share on other sites More sharing options...
Mach 5 Posted November 5, 2006 Author Report Share Posted November 5, 2006 How do you find it hard to believe? My dad drives a ricey 4 cylinder. The original plugs would get about 30mpg. After about 56,000 miles before I changed them, he was getting barely 25mpg. With these new iridium plugs he gets about 37- 40 highway and 20-25 city. The jump is all depending on his driving mood. Its this big jump that is making me want to buy them since he just proved it. My question is would it work? That lowly little 3.1 is a decent engine in a car that I love to drive. Quote Link to comment Share on other sites More sharing options...
Brian P Posted November 5, 2006 Report Share Posted November 5, 2006 how were his plugs at 56,000 miles? Were they long life ones or ? I have NGK iridiums in my engine under the AC delco stamp. They are ok, but I don't think they make them pre-gapped at .040" like you need. Adjusting the gap may not be a good idea on these since there is an iridium "patch" on the outer electrode that won't be in line with the center electrode in that case. On a side note, we still gotta meet up. I gotta see that car. I've always liked white '89-90 SE's Quote Link to comment Share on other sites More sharing options...
White93z34 Posted November 5, 2006 Report Share Posted November 5, 2006 well, after 56,000 just about any stock-plug could stand a change. so even putting factory replacements in most likely would have yeilded the results you saw. NGKs are good plugs and all, i like to use them on imports myself. but for my GM cars i use standard run of the mill ACD plugs. if you are getting 14mpg. is that highway or city? if thats highway, i'd consider a full tuneup, because plugs aren't gona be the only factor in that number. Quote Link to comment Share on other sites More sharing options...
kuntzie Posted November 5, 2006 Report Share Posted November 5, 2006 personally i didnt leik the irruidumrs in my tgp Quote Link to comment Share on other sites More sharing options...
GOT2B GM Posted November 5, 2006 Report Share Posted November 5, 2006 personally i didnt leik the irruidumrs in my tgp I have Iridiums in my TGP and they seem to work well. What do you use for plugs? Quote Link to comment Share on other sites More sharing options...
kuntzie Posted November 5, 2006 Report Share Posted November 5, 2006 ac delcos Quote Link to comment Share on other sites More sharing options...
Steven_S Posted November 5, 2006 Report Share Posted November 5, 2006 delcos Quote Link to comment Share on other sites More sharing options...
GutlessSupreme Posted November 5, 2006 Report Share Posted November 5, 2006 Delcos x3 Quote Link to comment Share on other sites More sharing options...
Mach 5 Posted November 5, 2006 Author Report Share Posted November 5, 2006 I use regular AC Delcos. They were just changed. Quote Link to comment Share on other sites More sharing options...
97loudcut Posted November 5, 2006 Report Share Posted November 5, 2006 delcos xPENIS Quote Link to comment Share on other sites More sharing options...
greencutlassdrvr Posted November 6, 2006 Report Share Posted November 6, 2006 rapid fires Quote Link to comment Share on other sites More sharing options...
5speedz34 Posted November 6, 2006 Report Share Posted November 6, 2006 I've heard real good things about NGK's and Denso's, but for a 3.1 I would just use AC Delcos. Quote Link to comment Share on other sites More sharing options...
1990lumina Posted November 6, 2006 Report Share Posted November 6, 2006 NGK are all I run in my RX-7....running straight Delcos in my Lumina though....I picked up a good 7mpg after my tune up as well...if you leave things long enough they will have a very negative effect on mileage...I barely noticed ANY performance gains from the tune up..but at least I'm getting decent mileage...if it's only making 140hp I want to see 4 cylinder like economy lol Quote Link to comment Share on other sites More sharing options...
gp90se Posted November 8, 2006 Report Share Posted November 8, 2006 glow plugs FTW Delcos high end plugs = ngks surprised the 3.4 guys haven't said anything bout denso's, real nice plug imo Quote Link to comment Share on other sites More sharing options...
SigEpCutlass Posted November 8, 2006 Report Share Posted November 8, 2006 I run NGK Iridiums in my cutty, and they really weren't much more than delcos because I bought them from Summit. They've been good to me so far. Quote Link to comment Share on other sites More sharing options...
intern8tion9l Posted November 8, 2006 Report Share Posted November 8, 2006 glow plugs FTW haha! yeah! denso's are def good from what i hear about people using them. i had ngk iridium in mine, which i liked. i swapped them for delcos cause i thought i was having a problem with one of them. since my car runs like ass right now i can't really tell the difference. well the last time i actually drove it two months ago i couldn't tell Quote Link to comment Share on other sites More sharing options...
DOHCRagtopguy Posted November 8, 2006 Report Share Posted November 8, 2006 NGK = good for Jap engines. GM cars with the waste spark ignition system run best on AC plugs, preferably Rapidfires. Quote Link to comment Share on other sites More sharing options...
Mach 5 Posted November 8, 2006 Author Report Share Posted November 8, 2006 So what should I go with, NGKs or Rapid fires? Quote Link to comment Share on other sites More sharing options...
kuntzie Posted November 8, 2006 Report Share Posted November 8, 2006 rapid fires Quote Link to comment Share on other sites More sharing options...
Mach 5 Posted November 9, 2006 Author Report Share Posted November 9, 2006 is there any improvement Quote Link to comment Share on other sites More sharing options...
digitaloutsider Posted November 9, 2006 Report Share Posted November 9, 2006 They're a more "performance" oriented plug. They're supposed to give a hotter, more powerful spark. Quote Link to comment Share on other sites More sharing options...
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