fastphil666 Posted May 16, 2020 Share Posted May 16, 2020 Had an issue today with the supra, went to the supermarket on it. On the way we had 2nd turbo, saw 15psi at ome point (wasnt thrashing her) then went for fuel. On the way back no second turbo at 4k, at the transition point i had around 8.2psi. Went past 4k and it actually dropped to around 7psi. Would a good place to look be the egcv/vsv for the egcv? Had a similar issue last year, went through all vsv's and pipe work and didnt find anything. Drove cottectly after re-assembly though. Quote Link to comment Share on other sites More sharing options...
Annabella Posted May 16, 2020 Share Posted May 16, 2020 Boost pipe come off? Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted May 16, 2020 Share Posted May 16, 2020 IACV solenoid is the likely culprit, on top o the intake pipework, towards the back. Cheap fix, about 80 quid Quote Link to comment Share on other sites More sharing options...
fastphil666 Posted May 16, 2020 Author Share Posted May 16, 2020 Ive got a pdf for all vsv checks, so i'll go through them. Thanks Quote Link to comment Share on other sites More sharing options...
fastphil666 Posted May 17, 2020 Author Share Posted May 17, 2020 Just thinking, as you do on a sunday night. I tested all the vsv's last time with the engine cold and they were all acceptable resistance. When the vsv's warm up with engine bay temp could the resistance be unacceptable? Would make sense as both times its happened it was warm, i had both turbo's when the engine bay was cooler. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted May 18, 2020 Share Posted May 18, 2020 Yes, resistance increases with heat. Quote Link to comment Share on other sites More sharing options...
fastphil666 Posted May 18, 2020 Author Share Posted May 18, 2020 You mean lowers with heat? [emoji848] Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted May 19, 2020 Share Posted May 19, 2020 No, I mean what I said Quote Link to comment Share on other sites More sharing options...
fastphil666 Posted May 19, 2020 Author Share Posted May 19, 2020 No, I mean what I said No worries i wasnt sure, either way if it goes to a radical resistance when i add heat its probably goosed. I should get chance to test them this weekend. I will report my findings. Quote Link to comment Share on other sites More sharing options...
mike33 Posted May 19, 2020 Share Posted May 19, 2020 I had a 2nd turbo issue not cutting in 1st one came in! But SRD found that engine was running out of fuel and found as the car had sat for 7years prior to me buying her the fuel pump had gone completely rusty! Change and cleaned out and she runs like a dream now! So may need checking bud! Quote Link to comment Share on other sites More sharing options...
fastphil666 Posted May 20, 2020 Author Share Posted May 20, 2020 I had a 2nd turbo issue not cutting in 1st one came in! But SRD found that engine was running out of fuel and found as the car had sat for 7years prior to me buying her the fuel pump had gone completely rusty! Change and cleaned out and she runs like a dream now! So may need checking bud!Previous owner fitted an uprated pump about 2 years ago. Thankyou for the input though. This fault is intermittent, have done around 1700miles in the last year and its happened twice. First time i checked every vsv for resistance at 20°c, all looked ok put it back together and she worked again. That was summer 19' but its not been used over winter and then barely used since due to lockdown. I have a sneaky feeling that with heat one of the vsv's resistance is going out of spec as earlier on before stuff got heat soaked we had both turbo's playing nicely. Quote Link to comment Share on other sites More sharing options...
fastphil666 Posted May 23, 2020 Author Share Posted May 23, 2020 This may well be my issue the rear vsv, in front of the turbo. This house was off. Im assuming it should be on?? Quote Link to comment Share on other sites More sharing options...
fastphil666 Posted May 23, 2020 Author Share Posted May 23, 2020 The vsv is gas control valve, my car has a boost controller so i know waste gate vsv will only have one pipe on port f the other has been diverted to the controller. I take it gas control valve should have both pipes attached?? Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted May 24, 2020 Share Posted May 24, 2020 Yes, if the EGBV (exhaust gas bypass valve) wont open you wont have a second turbo Quote Link to comment Share on other sites More sharing options...
fastphil666 Posted May 24, 2020 Author Share Posted May 24, 2020 Yes, if the EGBV (exhaust gas bypass valve) wont open you wont have a second turbo[emoji106] Yes, im going to test it today on the supermarket jaunt. Hopefully that was all it was[emoji106] Last time i had the issue, i replaced a lot of pipes with fuel hose. I found all the vacuum lines to be a sloppy fit now, so replaced with bmw oem vacuum line. Much tighter fit. Quote Link to comment Share on other sites More sharing options...
fastphil666 Posted May 24, 2020 Author Share Posted May 24, 2020 This was the issue, 16.2 psi felt lovely. Especially when it was a free fix. Fuel hose works fine as a replacement for pipes that are clipped but not for vacuum! Quote Link to comment Share on other sites More sharing options...
fastphil666 Posted February 5, 2022 Author Share Posted February 5, 2022 I have since had a fault repeat on me. Second turbo wont react sometimes. I managed to remove the pipes to the pressure tank, tested the vacuum a few times and it wont hold 17psi for a minute like it should. Its dropped 6 psi in a minute. I think my pressure tanks had it, has anyone changed one, it looks a bitch. Quote Link to comment Share on other sites More sharing options...
fastphil666 Posted April 8, 2022 Author Share Posted April 8, 2022 In case anyone was following this. My pressure tank tested fine. At this point i had checked all vsv's and hoses, everything was fine. I assumed the aem tru boost was all good, as its a good quality product. I was told when i bought it that it wasnt set up so run it in the off setting. Which i did. So today i removed the aem, what a difference. i achieve higher psi on the 1st turbo (10psi) sometimes it was 5psi? the transistion to 2nd turbo is smooth (used to jerk) and high psi of 17.2psi is still the same because it uses the restrictor ring. Im sure with a proper set-up the aem is a good bit of kit but it seems to have been interfering with my bpu set-up. 3 Quote Link to comment Share on other sites More sharing options...
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