wile e coyote Posted November 7, 2007 Share Posted November 7, 2007 Do i realy need a boost controler with a restrictor ring? As some people are telling me diferent things. Also how can i tell if i have a walbro pump? Collecting bits now for BPU Link to comment Share on other sites More sharing options...
TLicense Posted November 7, 2007 Share Posted November 7, 2007 It depends.... which is probably why different people are telling you different things. The idea behind fitting the restrictor ring is to limit the minimum boost the car will make when fully on song. A boost controller won't do this. However the boost controller will enable you to raise the boost from the minimum. Say for a 1.2 bar target it works like this. When you decat you find that with just the stock boost control system, you're overboosting to say 1.4 bar. So you fit a restrictor ring. This brings the boost down to say 1 bar. You then fit a boost controller and raise the boost back to 1.2 bar. Now if you're clever and very patient you can just fit the restrictor ring, see what boost that brings it down to, and if it's too low, file it out until it gives you the 1.2bar. That will work fine. However, using a boost controller IMHO is a better idea as it enables you to hold the wastegate shut so that you can make boost earlier. You'll still only make 1.2bar so the ultimate boost is the same, but when you make that boost will make a big difference to how the car drives. (Hence why lots of people overlay turbo graphs to see who's spools earliest) Walbro pump is a tricky one without getting in there and having a look. They're noisier than stock, but unless you've got a stock one to compare to you'll never be able to tell. You could check all the wiring. If it looks like it's been butchered in any way, then obviously something's been going on, it is possible that it's because a Walbro has been fitted. Or it could just be that someone wanted to bodge some wiring. If you decide to take a look inside the tank to check the pump, then the walbro has "walbro" written on the side of it! Also when you take the tank cover off, you'll be able to tell as most likely the wiring from the pump will be connected to the stock loom with some non-stock connector of some type (bullet connectors or similar most likely). Hope that helps! Link to comment Share on other sites More sharing options...
Pete Posted November 7, 2007 Share Posted November 7, 2007 Your standard VVTi pumps will work fine and still provide plenty to allow the ECU to over fuel tremendously. I've toyed with the idea of a boost controller before, but their questionable on the VVTis and there have been many discussions in the past. One person reported better performance without a boost controller. In the end I decided the money would be better off put towards something like an EManage Ultimate to control more things than simply boost. Getting the fuelling mapped properly can provide an extra 30bhp+ Link to comment Share on other sites More sharing options...
Sandy-m2 Posted November 7, 2007 Share Posted November 7, 2007 Bit of a Hijack here - if you dont have cats but have a stock exhaust, therefore still to restrictive to allow more boost Then you put a boost controller in will it damage anything if you up the boost? Link to comment Share on other sites More sharing options...
wile e coyote Posted November 7, 2007 Author Share Posted November 7, 2007 Chears pete .As we both have VVTI's I may just pick your brains.Have you gone BPU or you thingking about it? Link to comment Share on other sites More sharing options...
Supradan Posted November 7, 2007 Share Posted November 7, 2007 Def going bpu then darren:) I am thinking about it,where are you getting your parts fitted or are you going to have a go yourself? Link to comment Share on other sites More sharing options...
wile e coyote Posted November 8, 2007 Author Share Posted November 8, 2007 Getting the bits as i go second hand or new.Then will decide ether to do it my self or get somebody to do it. Link to comment Share on other sites More sharing options...
Pete Posted November 16, 2007 Share Posted November 16, 2007 Chears pete .As we both have VVTI's I may just pick your brains.Have you gone BPU or you thingking about it? I've been BPU for 2 years now. Link to comment Share on other sites More sharing options...
styggen82 Posted November 17, 2007 Share Posted November 17, 2007 Your standard VVTi pumps will work fine and still provide plenty to allow the ECU to over fuel tremendously. I've toyed with the idea of a boost controller before, but their questionable on the VVTis and there have been many discussions in the past. One person reported better performance without a boost controller. In the end I decided the money would be better off put towards something like an EManage Ultimate to control more things than simply boost. Getting the fuelling mapped properly can provide an extra 30bhp+ Is the vvti fuel pump bigger than standard J-spec? also read somwhere inside her that the vvti wastegate are bigger than standard j.spec. ????? if so you don`t need a RR.... Link to comment Share on other sites More sharing options...
Nic Posted November 17, 2007 Share Posted November 17, 2007 Is the vvti fuel pump bigger than standard J-spec? also read somwhere inside her that the vvti wastegate are bigger than standard j.spec. ????? if so you don`t need a RR.... All the J-spec Supras use the same fuel pump, TT, VVTi and NA. The turbo part numbers did change on the VVTi, I don't think the wastegate is bigger though (but could be wrong). Link to comment Share on other sites More sharing options...
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