markybhoy86 Posted May 20, 2009 Share Posted May 20, 2009 Got my jspec supra decat last week but the guys had fitted the restrictor ring at the wrong place ( near where the 2nd cat was), the boost was running about 1.4 so i never drove it heavy and got it moved to where it should have been today- its still overboosting at 1.1-1.2 its a boost logic exhaust 3" to 4" at 2nd decat the restrictor ring is one i got off Paul (2") how can i get the boost down?? do i get a smaller restrictor ring (1 3/4")? i've got a boost controller etc but i know you can only turn boost up not down, so thats not much use right now lol Quote Link to comment Share on other sites More sharing options...
Duffman Posted May 20, 2009 Share Posted May 20, 2009 Get a 1 bar RR and turn it up if need be Quote Link to comment Share on other sites More sharing options...
markybhoy86 Posted May 20, 2009 Author Share Posted May 20, 2009 yeah thats what i thought the RR i bought was?! do i get one thats 1 3/4" made up and try that then turn the boost up? Quote Link to comment Share on other sites More sharing options...
chris2o2 Posted May 20, 2009 Share Posted May 20, 2009 Whats wrong with it making 1.1/1.2 bar mate ? Thats about what you would want no ? Quote Link to comment Share on other sites More sharing options...
magictorch Posted May 20, 2009 Share Posted May 20, 2009 What boost gauge do you have? Also what gear are you seeing 1.2 in? Quote Link to comment Share on other sites More sharing options...
markybhoy86 Posted May 20, 2009 Author Share Posted May 20, 2009 dont know the make of the boost gauge off the top of my head, i'll check when i get in the motor after work, can c 1.2 in 2nd gear, after i seen it i didnt take it above in any other gear....when it hits 1.2 the engine makes a weird sound as if its struggling and the red warning light comes on on the boost gauge and it wont pull anymore, if i ease off the 1.2 till the light goes off it will pull quite happily. i thought 1.2 was excessive for a j-spec? Quote Link to comment Share on other sites More sharing options...
jacko Posted May 20, 2009 Share Posted May 20, 2009 1.2 is fine if the supporting BPU mods are in place Quote Link to comment Share on other sites More sharing options...
tony tt Posted May 20, 2009 Share Posted May 20, 2009 1.2 is fine if the supporting BPU mods are in place Agreed 1.2 is the max boost recommended for j spec tubs but should run 1.2 fine mine does. Could it be your coils no? Quote Link to comment Share on other sites More sharing options...
markybhoy86 Posted May 20, 2009 Author Share Posted May 20, 2009 the connectors or the coil packs themselves? both have been checked recently cause of another problem i had and they where fine Quote Link to comment Share on other sites More sharing options...
magictorch Posted May 20, 2009 Share Posted May 20, 2009 Have you got a boost cut contoller fitted and is it still restricted? 1.2 should be ok on a jspec Quote Link to comment Share on other sites More sharing options...
tony tt Posted May 20, 2009 Share Posted May 20, 2009 What have you done as far as bpu is concerned mate? Quote Link to comment Share on other sites More sharing options...
tony tt Posted May 20, 2009 Share Posted May 20, 2009 Did you reset the ecu after you de-catted it? Quote Link to comment Share on other sites More sharing options...
markybhoy86 Posted May 20, 2009 Author Share Posted May 20, 2009 hks FCD boost controller boost gauge fuel decat 2" restrictor after 1st decat i dont know about a boost cut controller ? whats that? no i havn't reset the ecu, i'll try that 2moro though Quote Link to comment Share on other sites More sharing options...
tony tt Posted May 21, 2009 Share Posted May 21, 2009 hks FCD boost controller boost gauge fuel decat 2" restrictor after 1st decat Do you have an aftermarket fuel pump mate? Wallbero or bosch?? This is required when upping the boost also. Quote Link to comment Share on other sites More sharing options...
markybhoy86 Posted May 21, 2009 Author Share Posted May 21, 2009 wot does the fuel pump have to do with me overboosting? it can nw creep to 1.3 and thats me with al controler settings at min Quote Link to comment Share on other sites More sharing options...
jacko Posted May 21, 2009 Share Posted May 21, 2009 (edited) It doesnt have anything to do with it overboosting. But you need an uprated fuel pump if you start going over 1 bar I think the first step should be fitting a smaller restrictor ring, then tweaking the boost up to the desired level with the controller Edited May 21, 2009 by jacko (see edit history) Quote Link to comment Share on other sites More sharing options...
tony tt Posted May 21, 2009 Share Posted May 21, 2009 wot does the fuel pump have to do with me overboosting? it can nw creep to 1.3 and thats me with al controler settings at min Just trying to establish what mods you have for bpu first! As said smaller rr then go from there. Quote Link to comment Share on other sites More sharing options...
markybhoy86 Posted May 21, 2009 Author Share Posted May 21, 2009 aye thats wot a was gona try first,rr at 1.6" and c if i can get the boost down and take it from ther.doin that 2moro so il let use know wot happens.cheers for the advice Quote Link to comment Share on other sites More sharing options...
markybhoy86 Posted May 22, 2009 Author Share Posted May 22, 2009 i removed the 2" RR today and had a 1.6" one made up ( 1.6" was the smallest punch they had) it brought the boost back down to normal so i turned it up with the boost controller to 1bar, seems to be alright so far. its going into a tunning place to get everything checked over AFR's etc. at least thats me got one thing on the mend so far lol struggling with upper control arms-been on one side for 2 hours, gave up lol il try again 2moro when my back recovers lol Quote Link to comment Share on other sites More sharing options...
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