Toytown Posted August 27, 2005 Share Posted August 27, 2005 No not another "should I buy one" thread, I done that a year ago After reading various posts about the NA-T conversions, everybody seems to say that a standard N/A has a nice flat torque curve, which as I understand it, the car should pull well throughout it's rev range (3000 - 6000 ??) My N/A Auto is the total opposite ! From 2000 - 4000 it feels a bit flat 4-5000 it wakes up considerably 5000 - 6500 it pulls really strong The only way to make it go for it, is to bury the pedal & hold it there & when I do it can be quite impressive for a "lesser" model Now it's got me wondering if there's something wrong, or if it has been messed around with ?? Doesn't feel *so* quick to me, but it's the only MK4 I have ever driven, so can't compare it. What's YOUR N/A like ?? For the techies ........ this post got me wondering .... Its a two-mode tuned plenum. Probably close to state of the art when the engine was designed. Could it be that the valve on mine is stuck open or closed ? Quote Link to comment Share on other sites More sharing options...
Faye Posted August 28, 2005 Share Posted August 28, 2005 Mine is very responsive through the range, and now that I have the blow on my decat sorted it pulls like a train at 3500 revs onwards. What mods have you got? Quote Link to comment Share on other sites More sharing options...
Prof. Monkey Posted August 28, 2005 Share Posted August 28, 2005 Mine pulls hard through the range, check out my signature for the spec! Pulls very well above 5000rpm when the throttle is fully open, with the induction kit I have sounds like a turbo whistling. Quote Link to comment Share on other sites More sharing options...
loks Posted August 28, 2005 Share Posted August 28, 2005 Yup, mine feels very sluggish in the low rev range - thought I was alone Totally decatted so it's not that Quote Link to comment Share on other sites More sharing options...
Toytown Posted August 28, 2005 Author Share Posted August 28, 2005 Thanks for the replies, but now it's bugging me That said, I got a WRX sorted last night (had all sorts of "engine check" problems), then took it out a few times on tests & thought it felt a bit flat -- asked my son to try it & he said it went well (same son that says my supra is flat). Faye - NO mods whatsoever, I always thought it was a bit of a waste of time with an N/A ???? It's always surprised me that a 3L 24V with no turbo is such a "cammy" engine to drive, the best i can compare it to is a 16V GTE or Fiat Twin cam type power ....... like flicking a switch at 5000 rpm I really don't want a noisy exhaust, I love the car just as it is (plain & simple), but is an induction kit a worthwhile option ?? I thought I had read on her etht mods on NA were for noisy effect only & that's really not my aim. Could it be this valve thing that's the problem ?? Quote Link to comment Share on other sites More sharing options...
Faye Posted August 28, 2005 Share Posted August 28, 2005 Keep the stock airbox etc, there has been many a thread on how changing it can lead to flat spotting in the rev range - hardly what you need with a car that already seems to be running like that. Quote Link to comment Share on other sites More sharing options...
Whitesupraboy2 Posted August 28, 2005 Share Posted August 28, 2005 Mate dont worry it normal. Best way i can describe the sensation.....its like a mini turbo kicks in at about 4500rpm .....though obviously not as much power as a Turbo Quote Link to comment Share on other sites More sharing options...
Dave Posted May 25, 2006 Share Posted May 25, 2006 best mod u can do is a full decat and if you want it to fly use the manu button and change gear manually i have an apexi induction kit fully sheilded with two cold feeds on the filter .now ive done the decat it sounds great on full chat . Quote Link to comment Share on other sites More sharing options...
cdo1uk Posted May 31, 2006 Share Posted May 31, 2006 best mod u can do is a full decat and if you want it to fly use the manu button and change gear manually i have an apexi induction kit fully sheilded with two cold feeds on the filter .now ive done the decat it sounds great on full chat . what the "manu" button really do????? Quote Link to comment Share on other sites More sharing options...
Lucifer Posted May 31, 2006 Share Posted May 31, 2006 No not another "should I buy one" thread, I done that a year ago After reading various posts about the NA-T conversions, everybody seems to say that a standard N/A has a nice flat torque curve, which as I understand it, the car should pull well throughout it's rev range (3000 - 6000 ??) My N/A Auto is the total opposite ! From 2000 - 4000 it feels a bit flat 4-5000 it wakes up considerably 5000 - 6500 it pulls really strong The only way to make it go for it, is to bury the pedal & hold it there & when I do it can be quite impressive for a "lesser" model Now it's got me wondering if there's something wrong, or if it has been messed around with ?? Doesn't feel *so* quick to me, but it's the only MK4 I have ever driven, so can't compare it. What's YOUR N/A like ?? For the techies ........ this post got me wondering .... Could it be that the valve on mine is stuck open or closed ? Sorry anly just seen this. I woudl put money on it your Air intake control valve is either sticking or not working. Basically its a butterfly that opens at 4500rpm to let more air in for high rpm rev range, but below is shut to increase torque. It sits between teh V section of the intake manifold on your engine, you cant miss it. Quote Link to comment Share on other sites More sharing options...
Digsy Posted May 31, 2006 Share Posted May 31, 2006 Sorry anly just seen this. I woudl put money on it your Air intake control valve is either sticking or not working. Basically its a butterfly that opens at 4500rpm to let more air in for high rpm rev range, but below is shut to increase torque. It sits between teh V section of the intake manifold on your engine, you cant miss it. Its a distinct possibility. Quote Link to comment Share on other sites More sharing options...
Supradan Posted July 3, 2006 Share Posted July 3, 2006 Sorry anly just seen this. I woudl put money on it your Air intake control valve is either sticking or not working. Basically its a butterfly that opens at 4500rpm to let more air in for high rpm rev range, but below is shut to increase torque. It sits between teh V section of the intake manifold on your engine, you cant miss it. Martin how would i know if this is sticking/not working cos mine is the same very flat below 5000rpm it feels a diff car in the mornings when first driving after warming it up at idle for 5mins very responsive and pulls well from 2500rpm?? Quote Link to comment Share on other sites More sharing options...
Supradan Posted July 3, 2006 Share Posted July 3, 2006 WOW.....Martin you may very be getting a big sloppy kiss on sunday:kiss: Went and had a look at the butterfly valve and to my amazement there was a vac pipe just lying next to a steel vac pipe What if i connect them together and hey presto an na supe with power below 5000rpm The kick at 5000rpm is not as violant anymore but only because i have power throughout the rev range.......RESULT Gonna wait till the hks ti is fitted and then i may even keep it as its a completly different car to drive now Quote Link to comment Share on other sites More sharing options...
Supradan Posted July 3, 2006 Share Posted July 3, 2006 Just got back from a bit of a run and cant believe how much difference a small vac pipe could do!!! Its a much nicer car to drive now,you dont have to ring its neck to get any performance out it,for some reason gear changes seem smoother now?? :) :) Quote Link to comment Share on other sites More sharing options...
Ian W Posted July 5, 2006 Share Posted July 5, 2006 Went and had a look at the butterfly valve and to my amazement there was a vac pipe just lying next to a steel vac pipe What if i connect them together and hey presto an na supe with power below 5000rpm is it really obvious when you're looking for it then? i may take a look at mine just to see it all working as it should. Quote Link to comment Share on other sites More sharing options...
Rob Davey Posted July 5, 2006 Share Posted July 5, 2006 Sorry anly just seen this. I woudl put money on it your Air intake control valve is either sticking or not working. Basically its a butterfly that opens at 4500rpm to let more air in for high rpm rev range, but below is shut to increase torque. It sits between teh V section of the intake manifold on your engine, you cant miss it. Does anyone have a picture of this for the numpty's amongst us? Quote Link to comment Share on other sites More sharing options...
Lucifer Posted July 5, 2006 Share Posted July 5, 2006 Its the valve that sits between the V on the intake. Quote Link to comment Share on other sites More sharing options...
Rob Davey Posted July 5, 2006 Share Posted July 5, 2006 forgive me. Thats the bit that comes from the air filter? Thanks to Yewtave's Garage for the image, now can someone pin the tail on the donkey!? Quote Link to comment Share on other sites More sharing options...
Ian W Posted July 5, 2006 Share Posted July 5, 2006 it's where the bright silver bit on top of the cam-cover splits into a V shape mate. (i think!) Quote Link to comment Share on other sites More sharing options...
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