raddys Posted September 7, 2015 Share Posted September 7, 2015 Hello everybody, as a few of you know from my recent string of noob questions, I am a new owner of a supra n/a manual Anyway when I give it some and get to 5000 revs the car seems to launch itself even more (like hondas vtec) Just wondering if this is standard on n/a supras Also while on the matter, when I do hit 5k it makes a sort of whistly/screeching sound (it doesn't sound bad or anything). Just thought someone might have experienced the same Cheers guys Quote Link to comment Share on other sites More sharing options...
Scott Posted September 7, 2015 Share Posted September 7, 2015 I did read something about this a while back but I can't remember what it was. I think it's a standard thing but I can't recall why. Quote Link to comment Share on other sites More sharing options...
stevie_b Posted September 7, 2015 Share Posted September 7, 2015 IIRC a butterfly valve on the intake plenum opens at higher RPMs (I thought it was about 4k but might be wrong) to give it a bit more poke at higher revs. Quote Link to comment Share on other sites More sharing options...
j_jza80 Posted September 7, 2015 Share Posted September 7, 2015 As above It is nothing like as fancy as the Vtec system, but I believe it is for optimizing torque across the rev range Personally, I would prefer the car was a little slower and had a more conventional plenum arrangement, as you will discover doing spark plugs on an NA is an awful job Quote Link to comment Share on other sites More sharing options...
Scott Posted September 7, 2015 Share Posted September 7, 2015 Ahh yes that's it. Is there not also something about removing it to gain more power down low? I'm sure I read a thread with a bit of fettling to it Quote Link to comment Share on other sites More sharing options...
Kendo11 Posted September 7, 2015 Share Posted September 7, 2015 Yeah I've noticed this too, nice tiny little bit of extra poke. Definitely agree on the plugs, horrible job! Quote Link to comment Share on other sites More sharing options...
raddys Posted September 7, 2015 Author Share Posted September 7, 2015 Yer I have heard about the plugs, it's whole inlet off isn't it? Quote Link to comment Share on other sites More sharing options...
Kendo11 Posted September 7, 2015 Share Posted September 7, 2015 Oh yes Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted September 7, 2015 Share Posted September 7, 2015 its 10 bolts . 2 plugs , 2 pipes and I few vac hoses , its really not a big deal Quote Link to comment Share on other sites More sharing options...
Kendo11 Posted September 7, 2015 Share Posted September 7, 2015 Yeah, good luck to a novice. Have fun raddys Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted September 7, 2015 Share Posted September 7, 2015 evrybodys a novice the first time Quote Link to comment Share on other sites More sharing options...
Kendo11 Posted September 7, 2015 Share Posted September 7, 2015 Exactly, I've done it a few times now and you've probably done it a thousand but definitely not fun first time round! One of them jobs you give yourself a pat on the back after doing haha. Quote Link to comment Share on other sites More sharing options...
raddys Posted September 7, 2015 Author Share Posted September 7, 2015 Haha well il look forward to the job satisfaction I get when I get to do that one then Quote Link to comment Share on other sites More sharing options...
Kendo11 Posted September 7, 2015 Share Posted September 7, 2015 Plenty of guides on here if you need them Quote Link to comment Share on other sites More sharing options...
Nic Posted September 8, 2015 Share Posted September 8, 2015 https://en.m.wikipedia.org/wiki/Acoustic_Control_Induction_System Quote Link to comment Share on other sites More sharing options...
downimpact Posted September 8, 2015 Share Posted September 8, 2015 Haha well il look forward to the job satisfaction I get when I get to do that one then yes my thoughts were, I'm never changing those again... Quote Link to comment Share on other sites More sharing options...
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