ratter Member 6,793 Member For: 18y 10m 10d Gender: Male Location: @ my laptop Posted 12/02/14 11:23 PM Share Posted 12/02/14 11:23 PM can make banging noises with overboost, then it will go totally quiet 6 Link to comment Share on other sites More sharing options...
Rab WOT? Moderating Team 10,981 Member For: 12y 1m 12d Gender: Male Location: Frankston, 3199 Posted 12/02/14 11:39 PM Share Posted 12/02/14 11:39 PM Heaps more economy though Link to comment Share on other sites More sharing options...
xr6tee9 Member 82 Member For: 11y 2m 8d Gender: Male Location: adelaide Posted 12/02/14 11:39 PM Author Share Posted 12/02/14 11:39 PM can make banging noises with overboost, then it will go totally quietnah, no banging noises, just seems to flutter more than I remember when coming off boost Link to comment Share on other sites More sharing options...
senna_T Forged Member Lifetime Members 15,818 Member For: 18y 1m 30d Gender: Male Location: SW Sydney Posted 13/02/14 05:11 AM Share Posted 13/02/14 05:11 AM So what the other guys aren't saying is that you are running too much boost and you will probably lean it out and destroy the motor without a tune...Fix the preload issue and have the car tuned so you know that the mixtures are safe etc... 2 Link to comment Share on other sites More sharing options...
xr6tee9 Member 82 Member For: 11y 2m 8d Gender: Male Location: adelaide Posted 13/02/14 10:55 AM Author Share Posted 13/02/14 10:55 AM So what the other guys aren't saying is that you are running too much boost and you will probably lean it out and destroy the motor without a tune...Fix the preload issue and have the car tuned so you know that the mixtures are safe etc...yeah right.. I wasnt aware the car needed a retune after only changing the compressor wheel...? and the way I see it.. if the actuator was set up originally with the rod coming out on a slight angle and now I have it dead straight out of diaphram, I would only be reducing the preload not increasing it.. put compressor on it today at 10psi , slightly opened it, 15psi and it open with approx 25mm travel.. Link to comment Share on other sites More sharing options...
senna_T Forged Member Lifetime Members 15,818 Member For: 18y 1m 30d Gender: Male Location: SW Sydney Posted 14/02/14 01:20 AM Share Posted 14/02/14 01:20 AM So I would say that is your issue, the car only runs 5-6psi at full boost in standard form. I'd say you have an aftermarket actuator (the original ones aren't adjustable from memory) so any change to the preload could dramatically change the amount of boost being commanded. 1 Link to comment Share on other sites More sharing options...
xr6tee9 Member 82 Member For: 11y 2m 8d Gender: Male Location: adelaide Posted 14/02/14 01:38 AM Author Share Posted 14/02/14 01:38 AM (edited) So I would say that is your issue, the car only runs 5-6psi at full boost in standard form. I'd say you have an aftermarket actuator (the original ones aren't adjustable from memory) so any change to the preload could dramatically change the amount of boost being commanded. CAR HAS 369.8RWKW.. hdi cooler kit, injectors, fuel pump, 4in stainless dump, hi flo 4in-3.5-4in cat, 2.5in dual xforce. pod in box, 2x custom tunes, SCT X2, 12psi actuator, ported wastegate and bigger flapper..etc etc.. running 12 psi tune, tuned by bruce heinrich Edited 14/02/14 01:47 AM by xr6tee9 Link to comment Share on other sites More sharing options...
senna_T Forged Member Lifetime Members 15,818 Member For: 18y 1m 30d Gender: Male Location: SW Sydney Posted 14/02/14 02:26 AM Share Posted 14/02/14 02:26 AM So again, either fix the preload issue and get a dyno run to make sure the AFR's etc are safe or take the car to Bruce and get him to tune it with the new preload setting and see if it works right. If you have a stock motor then it won't take too much to bend a rod or burn through a piston if the car is running lean due to more boost and no corrected fuel map. more flutter means more boost, so you need to address that with these cars. The ECU may be pulling timing out when it senses any knock or pinging but that is a poor band-aid measure and not one you want to rely on for a long time. 1 Link to comment Share on other sites More sharing options...
xr6tee9 Member 82 Member For: 11y 2m 8d Gender: Male Location: adelaide Posted 14/02/14 02:58 AM Author Share Posted 14/02/14 02:58 AM So again, either fix the preload issue and get a dyno run to make sure the AFR's etc are safe or take the car to Bruce and get him to tune it with the new preload setting and see if it works right. If you have a stock motor then it won't take too much to bend a rod or burn through a piston if the car is running lean due to more boost and no corrected fuel map. more flutter means more boost, so you need to address that with these cars. The ECU may be pulling timing out when it senses any knock or pinging but that is a poor band-aid measure and not one you want to rely on for a long time. thanks senna-T, finally my question answered "more flutter means more boost" most informative so far with more than half arsed answers.. im in the process of purchasing a boost and oil pressure guage (think the autometer cobolts look great), I have noticed the flutter b4 repairs, but only when gunning it off lights, boosting up then backing off hard.. and as I said in previous post.. if the rod is coming directly out of actuator and was previously on a slight angle it would actually reduce the preload (do you agree??).. anyway.. none the less I will do a oil and filter change and get it down to bruce to do a followup tune.. thanks for the info and cheers for your help.. by the way its a BFII update.. Link to comment Share on other sites More sharing options...
senna_T Forged Member Lifetime Members 15,818 Member For: 18y 1m 30d Gender: Male Location: SW Sydney Posted 14/02/14 03:57 AM Share Posted 14/02/14 03:57 AM honestly I'm not sure on the angle re pre-load. From memory the actuator rod extends to open the gate bypassing the exhaust gas and slowing the turbine. In this way of thinking the rod could be on an angle because the swing arm was half open meaning that the pre load on the actuator was incorrect in the first place. but I'm no turbo/actuator expert... Link to comment Share on other sites More sharing options...
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