Andrew Dunk Shaw Posted October 24, 2002 Share Posted October 24, 2002 Hi Guys, Im going to remove the 1st cat now, i have already got a Super Drager and HKS second cat removal pipe fitted and just wanted to know whats the best boost controller to fit uk tt auto. I preferably want a simple unit so that i can just set the boost just below danger levels, say (15-16 psi ?) and leave it to do its job. Dont really want to have to put on FCD or extra boost gauges. Regards Andrew(dunk)Shaw Black uk mkiv tt Quote Link to comment Share on other sites More sharing options...
Andrew Posted October 24, 2002 Share Posted October 24, 2002 I was just going to post the same question. I'm looking for the same as you, but have you seen the combined FCD boost controllers? Can anyone comment on those? Preferably the blitz one. Appologies for jumping in on you thread Andrew. Quote Link to comment Share on other sites More sharing options...
GavinL Posted October 24, 2002 Share Posted October 24, 2002 I have a Blitz DSBC on my car. It has four settings of which I only use the one. It has a built in digital boost gauge and overboost warning which you can hear quite well over music. With the above in mind I have mine in the glove compartment and don't think about it from one week to the next. If you want to run over 15psi fit an fcd (17/18psi for a uk spec is reasonable), simple and hides under the passenger carpet. There is no need to fill the car with lots of gauges and boxes, the car won't go any faster. Quote Link to comment Share on other sites More sharing options...
as5606 Posted October 24, 2002 Share Posted October 24, 2002 Hi, As far as I understand it, a boost controller will not be much use unless when you remove the cat, it is not producing enough boost on its own accord without the restriction it once had. Removal of both cats should give you about 1.2-1.3 bar which is maximum safe limits anyway. A boost guage will not be able to reduce this. A FCD is a must after about 1.1 bar anyway so all you need is a FCD and a boost guage to indicate your boost and ensure that you can see it is not overboosing. I may be wrong though Quote Link to comment Share on other sites More sharing options...
Andrew Dunk Shaw Posted October 24, 2002 Author Share Posted October 24, 2002 No prob Andrew, Jump in anytime m8. Does an FCD have to be inside the car (cockpit i mean) ? The BC in the glove box is a good idea. Cheers Gav Regards Andrew(dunk)Shaw Black uk mkiv tt Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted October 24, 2002 Share Posted October 24, 2002 Well my DSBC will hold boost down to 1bar without too much trouble. Quote Link to comment Share on other sites More sharing options...
Andrew Posted October 24, 2002 Share Posted October 24, 2002 So effectively you don't need a boost controller? Do they have a boost gauge that beeps when you hit a set PSI/BAR mark? That would mean we could fit FCD and a gauge and just keep an eye on it. Quote Link to comment Share on other sites More sharing options...
Adam W Posted October 24, 2002 Share Posted October 24, 2002 Yeah, you need an electronic boost gauge with a peak/hold/warning function. Greddy do a good one for ~£250, there may well be much cheaper alternatives though. Quote Link to comment Share on other sites More sharing options...
GavinL Posted October 24, 2002 Share Posted October 24, 2002 Originally posted by Adam Wootten Yeah, you need an electronic boost gauge with a peak/hold/warning function. Greddy do a good one for ~£250, there may well be much cheaper alternatives though. Blitz DSBC does all those things........ Quote Link to comment Share on other sites More sharing options...
Adam W Posted October 24, 2002 Share Posted October 24, 2002 Yeah, but it's impossible to read the display while you're on the move. I've got both, but on reflection I could have gone for the normal Greddy gauge and used the p/h/w features on the Blitz DSBC. Quote Link to comment Share on other sites More sharing options...
GavinL Posted October 24, 2002 Share Posted October 24, 2002 Originally posted by as5606 Hi, As far as I understand it, a boost controller will not be much use unless when you remove the cat, it is not producing enough boost on its own accord without the restriction it once had. Removal of both cats should give you about 1.2-1.3 bar which is maximum safe limits anyway. A boost guage will not be able to reduce this. A FCD is a must after about 1.1 bar anyway so all you need is a FCD and a boost guage to indicate your boost and ensure that you can see it is not overboosing. I may be wrong though what car are you talking about here UK or J-spec? Quote Link to comment Share on other sites More sharing options...
GavinL Posted October 24, 2002 Share Posted October 24, 2002 Originally posted by Adam Wootten Yeah, but it's impossible to read the display while you're on the move. I've got both, but on reflection I could have gone for the normal Greddy gauge and used the p/h/w features on the Blitz DSBC. Leon quite happily set my car up using the DSBC. Why would I want to send my life looking at the boost gauge when I have a boost controller keeping my boost at the desired level? Quote Link to comment Share on other sites More sharing options...
Thorin Posted October 24, 2002 Share Posted October 24, 2002 Originally posted by as5606 Hi, As far as I understand it, a boost controller will not be much use unless when you remove the cat, it is not producing enough boost on its own accord without the restriction it once had. Removal of both cats should give you about 1.2-1.3 bar which is maximum safe limits anyway. A boost guage will not be able to reduce this. A FCD is a must after about 1.1 bar anyway so all you need is a FCD and a boost guage to indicate your boost and ensure that you can see it is not overboosing. I may be wrong though This only applies to J-Specs, as this is a UK spec you will quite rightly require a Boost Controller to up the boost. Fuel cut is around 14-15 PSI I think, so you'll need an FCD if you want to go higher (TRL VFCC http://www.trlperformance.com/main.html). 1.2bar/18PSI is generally considered the "safe" level. With 1.3bar if you get FMIC/Water injection (but then you might want to just go for highbrids anyway ). Quote Link to comment Share on other sites More sharing options...
as5606 Posted October 24, 2002 Share Posted October 24, 2002 Thorin. Are you saying that a jspec will run higher boost levels with replacement cats than a UK spec and that a UK spec will need a boost controller to increase to 1.2-1.3bar like a j-spec will produce automatically. If this is so, why is that. Is it because of the different turbos or manifold? Quote Link to comment Share on other sites More sharing options...
GavinL Posted October 24, 2002 Share Posted October 24, 2002 Originally posted by as5606 Thorin. Are you saying that a jspec will run higher boost levels with replacement cats than a UK spec and that a UK spec will need a boost controller to increase to 1.2-1.3bar like a j-spec will produce automatically. If this is so, why is that. Is it because of the different turbos or manifold? J-spec cars with 3"cat replacement pipes and a low back pressure exhaust will overboost up to 1.7 bar. The cat replacement pipes sold by Chris Wilson maintain boost at 1.2-13 bar As I recall the UK spec cars have a different wastegate design, in fact I have never heard of one overboosting. Quote Link to comment Share on other sites More sharing options...
Thorin Posted October 24, 2002 Share Posted October 24, 2002 Yup, different wastegate on J-Specs. I'm no expert but it's unable to regulate the presure when the restriction of the cats is removed. Using 3" pipework would cause a J-Spec to overboost to dangerous levels, but fitting ~2.5" pipework (from Chris Wilson) or one of his restrictor plates will give just enough restriction to keep the boost below ~1.2 bar. I'm off to see Mr Wilson to have him remove both cats from my car soon, can't wait Oh and I know he does replacement pipes for UK specs too. Quote Link to comment Share on other sites More sharing options...
Terminator Posted October 24, 2002 Share Posted October 24, 2002 UK's have a recirculation system which prevents over boost, but also means they need a boost conroller to take full advantage of the decat and big bore pipes. Boost controllers are not necessary on decatted Jap specs on stock turbos IMHO :flame Dev No need to get it, I have my coat on, and am half way out the door. Quote Link to comment Share on other sites More sharing options...
Gaz Walker Posted October 24, 2002 Share Posted October 24, 2002 Originally posted by Terminator UK's have a recirculation system which prevents over boost, but also means they need a boost conroller to take full advantage of the decat and big bore pipes. Boost controllers are not necessary on decatted Jap specs on stock turbos IMHO Is that the EGR system then phil? Whats the crack if you blank off the system then, ala Gavin? Gaz. Quote Link to comment Share on other sites More sharing options...
Need4Speed Posted October 24, 2002 Share Posted October 24, 2002 I've got a Blitz Dual SBC and reckon it's excellent. I've also got a Greddy boost guage. The guage allows me to see what's going on and the boost controller monitors peaks and allows me a track day set-up, normal everyday set-up and I can shut it all down to remind myself of what a standard car is like. I can't fault it for a piece of tuning kit. Incidentally I have both cats still fitted although am considering removing one. Any views on which one will be appreciated. Quote Link to comment Share on other sites More sharing options...
GavinL Posted October 25, 2002 Share Posted October 25, 2002 Originally posted by John Packham I've got a Blitz Dual SBC and reckon it's excellent. I've also got a Greddy boost guage. The guage allows me to see what's going on and the boost controller monitors peaks and allows me a track day set-up, normal everyday set-up and I can shut it all down to remind myself of what a standard car is like. I can't fault it for a piece of tuning kit. Incidentally I have both cats still fitted although am considering removing one. Any views on which one will be appreciated. Remove the first (closely followed by the second) Quote Link to comment Share on other sites More sharing options...
Andrew Dunk Shaw Posted October 25, 2002 Author Share Posted October 25, 2002 Thankyou for all your input guys, so basicly if i want to go to 18psi which i suppose i will, then a Blitz DSBC and a FCD job done. Just one further question does anyone do a 3" 1st cat removal pipe for a uk tt. Regards Andrew(dunk)Shaw Black uk mkiv tt Quote Link to comment Share on other sites More sharing options...
Terminator Posted October 25, 2002 Share Posted October 25, 2002 Originally posted by John Packham I've got a Blitz Dual SBC and reckon it's excellent. I've also got a Greddy boost guage. The guage allows me to see what's going on and the boost controller monitors peaks and allows me a track day set-up, normal everyday set-up and I can shut it all down to remind myself of what a standard car is like. I can't fault it for a piece of tuning kit. Incidentally I have both cats still fitted although am considering removing one. Any views on which one will be appreciated. You cats are offering a lot of restriction in the system so your boost controller will enable you to have a range of boost levels at your control. Once the cats are out your minimum level with a boost controller will be much higher than you can sustain at the moment. IMO Before my restrictor ring was fitted I could hit 1.45bar, now my peak is 1.24. I have a pillar mounted peak/ hold gauge with the warning set to 1.20 just to remind me things are heating up, as my EGT probe is not located in the right place yet. My boost controller is my right foot. Quote Link to comment Share on other sites More sharing options...
Need4Speed Posted October 25, 2002 Share Posted October 25, 2002 In that case what's the advantage in me taking cat(s) out. The prime reason for the original question is that the centre cat is restricting my ground-clearance as my car runs wuite a low ride-height. I already have a steady 1.1bar if I want it but generally run 1.0. Any comments welcome. Quote Link to comment Share on other sites More sharing options...
Terminator Posted October 25, 2002 Share Posted October 25, 2002 Main advantages are cooler EGTs, a big plus IMHO and faster spooling turbos. The biggest heat resriction is the first cat not the second. Quote Link to comment Share on other sites More sharing options...
Need4Speed Posted October 25, 2002 Share Posted October 25, 2002 I figured first cat out would reduce the EGT, but thanks for the clarification. Quote Link to comment Share on other sites More sharing options...
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