MR.E

Another update, I've disconnected the actuator rod and im still getting at least 1b of boost so not good. I've emailed GCG who said they hadnt had any reports of boost problems, so I asked if it could be down to the split dump pipe and their last email reply was.... I do know for a fact that our RB25DET high flows we do will boost creep if the car doesn't have a cat, but I can't see why a further open flow dump pipe would have a problem (such as the D2 picture you sent). Apart from trying that flying dump pipe, I cannot suggest anything else as the flapper/porting we do is as big as you can possibly go in that exhaust housing, so there is no more room for porting. Regards, MICHAEL RAMSAY So basically I've paid for a turbo with no way of controlling the boost

Well I said Id post up with my results but its not what I was hoping for. Turbo's now fitted but we cant keep the boost down. I run a profec 2 EBC and its boosting way too high. The EBC has now been disconnected so its running with just the actuator but the boost just keeps rising, seeing it go upto at least 1.4bar and would probably keep rising if I tried I have emailed GCG who said they never run into boost issues. Heres their reply........ "There are a few things you need to check in order to eliminate some possible scenarios. *Blocked Catalytic Convertor causing excessive exhaust back pressure. *Broken/Split Vacuum hose from actuator to pressure source. *Too much pre-load on the actuator rod *Actuator rod bent and possibly catching on the bottom of the cannister/bracket. The reason I ask these questions is that we fit 38mm wastegate flappers to these turbochargers, which we also fot to XR6T turbos, and we never run into boost regulation issues. The only other thing you can do is pull the actuator off the turbo and bring it down for testing." Anyone else got any other ideas? Theres no CAT fitted and no split hoses Would appreciate any pointers as I'm in the UK so theres not much hope of me popping into GCG personally

http://gizzmousa.com/knock-monitor.html

Hi guys, my first post on here im from the UK, thought id give something back in return for all the great technical information I've got off this site. Sorry to bump an older thread but it seemed pointless starting a new one. In answer to the thread topic, I bought the advertised turbo from tweakit at the same time this thread was started. I havent had it fitted yet but I thought some of you might want to see what it is they are selling. I will attempt to add some pics! I double checked all the advertised sizes with them before shipment but on arrival it was different. It was advertised Compressor Housing A/R -: 0.70a/r but it is actually 50a/r. After informing them they have updated the website with the correct information. Sorry for the poor quality of the pics, they were taken on a webcam inside the lid of my laptop so hard to get a good angle etc The only badge on there is "GCG AC687 p/n GTST- GT3071R" It will be being fitted in the next few weeks hopefully, I have bought all the parts and engine was rebuilt last year, spec will read something like.. RB25DET wiseco forgies emanage ultimate, no afm fmic aftermarket exhaust decat downpipe steel headgasket tomei poncams 550 injectors walbro fuel pump (though im thinking of changing this) I think n1 oil pump was fitted but cant quite remember! Any feedback on the turbo I've bought would be great, I will post up my results when its all complete.