Spoony Posted May 23, 2007 Share Posted May 23, 2007 hi i have a blitz catback and removed the 2nd cat. today i installed a boost gauge and it only shows 0,7 bar (oem pressure). i allways thought, the better the flow, the higher the pressure??? or is it because the 1st cat is still in place? my plan is to decat the 1st cat and fit a 100 cell kat in the place of the 2nd. this should work like a restrictor ring and boost me to 1,2 bar. what am i doing wrong?? normally i thought i would have at least 1 bar?? Link to comment Share on other sites More sharing options...
dwayne Posted May 23, 2007 Share Posted May 23, 2007 what gauge did you fit. i tried a cheap one once and i found out it was labelled in psi but reading in bar so it always seemed low Link to comment Share on other sites More sharing options...
Spoony Posted May 23, 2007 Author Share Posted May 23, 2007 its a raid gauge, not the best but most people i know using it said it is ok, pressure was allways correct. i belive the shown boost pressure, first turbo is 0,5 bar, when the second starts it shows 0,7-0,8 bar. the car is faster than before, but it feels like maybe 10 or 20 hp to the oem driven Link to comment Share on other sites More sharing options...
dwayne Posted May 23, 2007 Share Posted May 23, 2007 you may have to try the ttc mod to eliminate vsv valves etc there is a link on how to do this in the technical section Link to comment Share on other sites More sharing options...
Paul Whiffin Posted May 23, 2007 Share Posted May 23, 2007 Have you got the exhaust restrictor up the tail pipe? That can knock the boost back.... Link to comment Share on other sites More sharing options...
Spoony Posted May 23, 2007 Author Share Posted May 23, 2007 there is no restrictor ring. after the turbos 1st oem downpipe with oem cat, then 2nd oem downpipe with a 70mm pipe instead of the cat. then blitz spec nür with no silencer. nothing else modified Link to comment Share on other sites More sharing options...
Glosphil Posted May 23, 2007 Share Posted May 23, 2007 Mines got an RSR Cat back and 2nd catt removed. 1st still in place and its making 1.2 bar if I push it, 1 bar if I dont. Thats according to a defi guage. Link to comment Share on other sites More sharing options...
Spoony Posted May 23, 2007 Author Share Posted May 23, 2007 the car is not really faster than before, so the gauge is not the problem. its only a small kick when the 2nd turbo starts, feels like the gauge shows it. 0,2 bar, not really powerfull and feels like oem boost pressure. so where can i start my search? maybe my turbos are down?? isnt there a small mode with a t pipe that let the turbos push as much as they can? i dont have any boost controller to test it Link to comment Share on other sites More sharing options...
Glosphil Posted May 23, 2007 Share Posted May 23, 2007 Mine doesnt feel that much faster than before either, maybe a little. And the 2nd turbo doesn kick in lick it did, its smooth. But guage reads 1ish bar Link to comment Share on other sites More sharing options...
Paul Whiffin Posted May 24, 2007 Share Posted May 24, 2007 I meant the baffle up the end of the exhaust, have you got that in there? Link to comment Share on other sites More sharing options...
Spoony Posted May 24, 2007 Author Share Posted May 24, 2007 i dont know what bafle you mean, maybe someone has a picture of it??? Link to comment Share on other sites More sharing options...
Paul Whiffin Posted May 24, 2007 Share Posted May 24, 2007 There should be a removable baffle in the tailpipe? Link to comment Share on other sites More sharing options...
Spoony Posted May 24, 2007 Author Share Posted May 24, 2007 aahhhh youre talking about the silencer in the blitz exhaust!! no, its removed, there is nothing to stop the flow, only the first cat. maybe its because i used the original downpipe and just weld a piece of pipe instead of the 2nd cat? i will test the bleeder t mod to make sure my turbos are fine. doeas anybody have better pictures for that? http://www.mkiv.com/techarticles/bleedert/bleedert.htm these pictures have a real bad resolution.... Link to comment Share on other sites More sharing options...
Spoony Posted May 24, 2007 Author Share Posted May 24, 2007 ok i tried the bleeder mod. pressure is the same, nothing happend. the pressure goes to 0,5 bar, when the 2nd turbo starts it goes shortly to 0,35 bar then 0,7-0,8 bar. when i run more than 6000rpm then the pressure runs down 0,1 bar sometimes. i guess the turbos are down?? the car has 75k miles and was absolutly stock when i bought it. any other ideas?? Link to comment Share on other sites More sharing options...
Thorin Posted May 24, 2007 Share Posted May 24, 2007 Sounds normal to me? I wouldn't expect more than 0.8-0.9 bar with one cat still in place. edit: now I actually read the whole thread I see you've tried the bleeder T mod thing. Leak somewhere? Link to comment Share on other sites More sharing options...
Spoony Posted May 24, 2007 Author Share Posted May 24, 2007 i just have a china copy hks blow off, directly after the turbos exit (the big rubber pipe that goes from the turbos to the intercooler). nothing else done. all stock. didnt find any leeks, but to be honest i dont know where to search. i really go mad!!!!!!! had the same problem with my vauxhall calibra 4x4 before. fited a k29 turbo and it only made 1,3 bar instead of 1,6. searched for 1 month, didnt find anything so i sold the car :d i cant play the same game with my supra! so any other ideas?? Link to comment Share on other sites More sharing options...
Thorin Posted May 24, 2007 Share Posted May 24, 2007 i just have a china copy hks blow off Do you still have the stock BOV you could refit and try? Link to comment Share on other sites More sharing options...
Spoony Posted May 24, 2007 Author Share Posted May 24, 2007 the stock bov is in place. i closed the pipe with a m6 screw. i allready tried to take the original air pressure pipe and put it on the stock bov, still the same. i cant remove the chinese blow off because the rubber that goes to the intercooler is cut for fitting the blow off. i had a plate that i could install instead of the blow off valve but i cant find it. Link to comment Share on other sites More sharing options...
Spoony Posted May 24, 2007 Author Share Posted May 24, 2007 here are two pictures, maybe i did something wrong with the bov Link to comment Share on other sites More sharing options...
Spoony Posted May 25, 2007 Author Share Posted May 25, 2007 no idea?? Link to comment Share on other sites More sharing options...
Ric Posted May 25, 2007 Share Posted May 25, 2007 lol at your' pictures, majourly wrong critically wrong. Link to comment Share on other sites More sharing options...
Ric Posted May 25, 2007 Share Posted May 25, 2007 ive included 2 pics what it should be like, put the red line from the BOV to where the arrow goes, and in the second pic the pipe you have wants to go back to the VSV (its behind the plug what the arrow is pointing too) its from, or onto the actuator on the turbo, i cant tell from the picture where its from. Edit, didnt see the HKS bov there, The pipe where i put the arrow too in the first picture wants to goto your bov. Then the other needs returning to stock Link to comment Share on other sites More sharing options...
Spoony Posted July 15, 2007 Author Share Posted July 15, 2007 i found the misstake the original blow off was broken. it was opened all the time, found it out while blowing some air through it i removed it completly, and now i have 0.8-1 bar. the car drives completly different. much faster spooling and it takes 40% less fuel damn, i thought oem toyota parts never break ? :d Link to comment Share on other sites More sharing options...
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