ManwithSupra Posted April 24, 2011 Share Posted April 24, 2011 (edited) I fitted a 1bar restrictor ring to the system between the Whifbitz 1st and 2nd decats and today on test I seem to still only be achieving stock boost figures 06-0.7 bar on the first turbo and then between 0.8-0.9 when the second one comes online?? I did the test early this afternoon but put the lower boost down to the air tempature, however i just popped out to try again (now its cooler) and its still the same. So I turned off the FCD just in case it was a gauge error and was not getting factory fuel cut so the car is defiantly boosting below 1 bar BPU levels. This is my setup... Whifbitz 1st Decat Whifbitz 2nd Decat Whifbitz 1bar restrictor Ring Blitz Nur Spec RX Walbro Fuel pump Turbosmart FCD2 NGK Iridium BKR7EIX Stock Airbox with K&N Filter Blitz Boost gauge What should/can i do? Edited May 9, 2011 by ManwithSupra (see edit history) Quote Link to comment Share on other sites More sharing options...
TTRickeh Posted April 24, 2011 Share Posted April 24, 2011 I had the same when I had a double 2.5'' Whifbitz decat and Nur Spec RX, I didn't even need a restrictor ring. Get a boost controller or a less restrictive exhaust to up the boost if you want. I've got a manual ball and spring type boost controller at the moment and i'm very happy with it. Quote Link to comment Share on other sites More sharing options...
ManwithSupra Posted April 24, 2011 Author Share Posted April 24, 2011 I had the same when I had a double 2.5'' Whifbitz decat and Nur Spec RX, I didn't even need a restrictor ring. Get a boost controller or a less restrictive exhaust to up the boost if you want. I've got a manual ball and spring type boost controller at the moment and i'm very happy with it. Would something like this be ok as i dont really want to change the RX? http://www.turbosmartonline.co.uk/?gclid=CJ-Qv7v3tagCFcod4QodaEVwCQ Will this help bring the boost up to 1bar or above? Quote Link to comment Share on other sites More sharing options...
TTRickeh Posted April 24, 2011 Share Posted April 24, 2011 A proper electronic boost controller with adjustable gain features like the looks of those e-boost2's would be best. I used to have a GReddy Profec Spec B but I stupidly sold it. I got a 15 quid one from eBay as a punt and it works dandy. I don't see the point of spending £50+ on a manual one for such a simple piece of machinery. Quote Link to comment Share on other sites More sharing options...
ManwithSupra Posted April 24, 2011 Author Share Posted April 24, 2011 A proper electronic boost controller with adjustable gain features like the looks of those e-boost2's would be best. I used to have a GReddy Profec Spec B but I stupidly sold it. I got a 15 quid one from eBay as a punt and it works dandy. I don't see the point of spending £50+ on a manual one for such a simple piece of machinery. Ah fantastic mate, will buy one of these now If i wanted to bring the turbos up over 1 bar, and still had the 1bar res ring in place would that cause damage to the turbos? Quote Link to comment Share on other sites More sharing options...
TTRickeh Posted April 24, 2011 Share Posted April 24, 2011 I'd take your restrictor ring out first to see if that gives you any more boost. If it does and it's under 1.2bar then great, although some people say they get more boost in cold weather so be careful if removing it leaves you significantly over 1bar in warm weather. If it doesn't change the boost level then you've taken a little restriction out of your exhaust that didn't need to be there. As for it damaging turbos I couldn't really say but plenty of people do it that way. There's always more risk of failure if you're upping the boost but I don't think it'd be an issue personally. Quote Link to comment Share on other sites More sharing options...
ManwithSupra Posted April 24, 2011 Author Share Posted April 24, 2011 I have decided to try a different exhaust as i am planning to go single in the next few months. Quote Link to comment Share on other sites More sharing options...
Homer Posted April 24, 2011 Share Posted April 24, 2011 Could be I missed something important, but what boost was it making before you fitted the restrictor? The RX is very restrictive, but shouldn't stop it reaching over 1.2 bar. Quote Link to comment Share on other sites More sharing options...
ManwithSupra Posted April 24, 2011 Author Share Posted April 24, 2011 Could be I missed something important, but what boost was it making before you fitted the restrictor? The RX is very restrictive, but shouldn't stop it reaching over 1.2 bar. It was making the same .7 and .9 Quote Link to comment Share on other sites More sharing options...
Homer Posted April 24, 2011 Share Posted April 24, 2011 Still think I'm missing something here, but why did you fit the restrictor if it was only making 0.9 at base level. If it's got both cats removed and an aftermarket decat it should easily reach well over 1.4 bar without any boost controller. The restrictor is essentially a very basic way to bring the peak boost down to it's base level, it's only needed after you've acheived the target minimum boost level The thing that's a bit strange is it's reaching high boost on the 1st turbo, but not much on the 2nd. It does seem to indicate it's getting choked up, but from what you've said there doesn't seem to be a good reason for that. A sledgehammer approach would be to remove the cat back and take it for a quick (and careful) run down the road to see what boost it will hit in 2nd under WOT. This will at least give an idea if it's the RX causing the restriction before splashing out on a new (and louder) exhuast. I'd only advise doing this if you still have the gearbox/exhaust support bracket still in place. Don't do it without. That said, if you do go through with the single plan you'll need to replace the exhaust if you want to make the most of a mid sized turbo. Quote Link to comment Share on other sites More sharing options...
ManwithSupra Posted April 24, 2011 Author Share Posted April 24, 2011 Still think I'm missing something here, but why did you fit the restrictor if it was only making 0.9 at base level. If it's got both cats removed and an aftermarket decat it should easily reach well over 1.4 bar without any boost controller. The thing that's a bit strange is it's reaching high boost on the 1st turbo, but not much on the 2nd. It does seem to indicate it's getting choked up, but from what you've said there doesn't seem to be a good reason for that. A sledgehammer approach would be to remove the cat back and take it for a quick (and careful) run down the road to see what boost it will hit in 2nd under WOT. This will at least give an idea if it's the RX causing the restriction before splashing out on a new (and louder) exhuast. I'd only advise doing this if you still have the gearbox/exhaust support bracket still in place. Don't do it without. That said, if you do go through with the single plan you'll need to replace the exhaust if you want to make the most of a mid sized turbo. The exhaust i had before just had the 2nd decat but still had the 1st cat in place and was boosting 0.7 and 0.9 so there was no need for a restrictor ring. I then had to change the exhaust (due to the other one breaking up) so decided to do a full decat and use a 1 bar restictor ring, however boost levels remains the same. Quote Link to comment Share on other sites More sharing options...
Homer Posted April 24, 2011 Share Posted April 24, 2011 That explains the bit I missed then It makes things very simple, but the heat these weeks make it non-ideal to setup a restrictor ring. Best thing to do would be to remove the restrictor to check your base level boost, if it goes past 1.2 bar in 2nd/3rd you'll know the exhaust is not a restriction. Next step is to fit the restrictor ring, then drill it out until you reach the minimum desired boost level. Restrictor rings are not an exact science. There is no such thing as a "1 bar restrictor", there are so many variables involved in getting a base level boost each one needs to be matched to the cars spec. Quote Link to comment Share on other sites More sharing options...
ManwithSupra Posted April 24, 2011 Author Share Posted April 24, 2011 Ok i will remove the ring to see how much base boost i get - cheers mate. Hopefully it will be well above what i am getting now. Quote Link to comment Share on other sites More sharing options...
Homer Posted April 24, 2011 Share Posted April 24, 2011 No problem and best of luck. Keep a very careful eye on the boost and don't get carried away, it's easily done first time you feel the pull of 1.2+ bar If it goes past 1.2 at any point, let off and drive home off-boost. It should at least rule out almost "everything else" if it reaches 1.2 bar without one. Quote Link to comment Share on other sites More sharing options...
ManwithSupra Posted April 24, 2011 Author Share Posted April 24, 2011 No problem and best of luck. Keep a very careful eye on the boost and don't get carried away, it's easily done first time you feel the pull of 1.2+ bar If it goes past 1.2 at any point, let off and drive home off-boost. It should at least rule out almost "everything else" if it reaches 1.2 bar without one. Ok will report back on how i get on. Quote Link to comment Share on other sites More sharing options...
scotty71 Posted April 24, 2011 Share Posted April 24, 2011 Sorry for the Hijack Im running .8 -.9 on double decat full BPU (so same issues). Im thinking of taking the ring out to find what it boosts at without. Homer is it ok to loose the support bracket that goes onto the 1st cat? as when I fitted the 1st decat the bracket would not line up? Quote Link to comment Share on other sites More sharing options...
Homer Posted April 24, 2011 Share Posted April 24, 2011 Scotty, I wouldn't normally recommend removing the restrictor, I only said this to Richard as I know he will be careful The support bracket isn't essential at BPU levels, I ran without one for years without issues. If possible it's best practice to have one as it'll be more forgiving on the manifold should you clip any speed bumps! It can be modified without too much problem and these days I'd definetely get one made up if for some reason the stock one didn't match up. Quote Link to comment Share on other sites More sharing options...
Branners Posted April 25, 2011 Share Posted April 25, 2011 I took my Blitz RX off my car as it would not hit the boost I wanted without a boost controller. It is a very quiet exhaust, but to get higher than 1bar boost I would have had to get a boost controller fitted. I changed to a Whifbitz twin box 3" system and that changed the car completely, boosts better and the noise is just right. Quote Link to comment Share on other sites More sharing options...
ManwithSupra Posted April 25, 2011 Author Share Posted April 25, 2011 (edited) Hmmm maybe i should just bite the bullet and change the system anyway as i am going to be going single in a few months. Might try the restrictor ring anyway in the meantime to see if that makes a difference. Otherwise Whifbitz twin box it is... Edited April 25, 2011 by ManwithSupra (see edit history) Quote Link to comment Share on other sites More sharing options...
ManwithSupra Posted April 25, 2011 Author Share Posted April 25, 2011 (edited) Going to remove the restrictor ring on wednesday afternoon to see if it makes a difference. However i am going to change the exhaust anyway (single soon) Edited April 27, 2011 by ManwithSupra (see edit history) Quote Link to comment Share on other sites More sharing options...
BOB B Posted April 27, 2011 Share Posted April 27, 2011 (edited) Hi Richard, just seen this thread, sorry you're having problems, I wouldn't have thought it was the exhaust though, I have a Greddy controller fitted, and I was running 1.25 boost on the high setting, and hitting it every time with the RX on. Hope you get it sorted. Edited April 27, 2011 by BOB B (see edit history) Quote Link to comment Share on other sites More sharing options...
TTRickeh Posted April 27, 2011 Share Posted April 27, 2011 Hi Richard, just seen this thread, sorry you're having problems, I wouldn't have thought it was the exhaust though, I have a Greddy controller fitted, and I was running 1.25 boost on the high setting, and hitting it every time with the RX on. Hope you get it sorted. That's with a boost controller though. It's the boost you get without a boost controller that lets you see how restrictive the exhaust is. Quote Link to comment Share on other sites More sharing options...
ManwithSupra Posted May 9, 2011 Author Share Posted May 9, 2011 (edited) Ok the exhaust has now been changed over to a Whifbitz 3" twin box system which is rated up to 700hp with no restrictions (which i may say sounds lovely) and a CW 1.2 bar restrictor ring. I am now getting just about 1 bar of boost on the 2nd turbo but the car is still not hitting fuel cut although it does feel quicker (FCD is turned off) Any idea's as i am out of them now... Am i right in thinking it could be a faulty bov? My setup is now... Whifbitz 1st Decat Whifbitz 2nd Decat CW 1.2 bar restrictor Ring Whifbitz 3" twin box exhaust Walbro Fuel pump Turbosmart FCD2 (still turned off) NGK Iridium BKR7EIX Stock Airbox with K&N Filter Blitz Boost gauge I suppose the next thing is to add a boost controller. Edited May 9, 2011 by ManwithSupra (see edit history) Quote Link to comment Share on other sites More sharing options...
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