CLEM0

That is the answer I was looking for- I thought so. I honestly think the timing is out ~10* retarded. I'm going to verify as soon as I physically can- but this would make sense, as 17-18* instead of 27-28* makes a shit tonne more sense to me on the RB25 top end.

It has ran at similar timing advance for almost a decade and hasn't gone to shit yet, so I presume whoever set the timing first didn't do it right- and as a result the value have been incorrect since day 1! I'm honestly not sure. It has had high values for so long. The stock knock sensor isn't great, but if it was knocking badly, surely it'd pick up at least something worrying, especially big knock. It picks up at most under full boost 25-30 or so. It had from memory 28* on the top end on previous tune, which is why I immediately went to go for a retune without doing a single thing else to the car (besides a full service), because, although i'm not familiar with tuning, I knew this was absurdly high for the RB25, yet it's now retuned and doing the same thing.... Whole lotta money! I am going to verify timing shortly with the cams only as that's very simple- and will have it checked by a shop with a timing light to verify and set correct base timing. I'd say i'll buy a timing light but this timing stuff is beyond me. I am pretty decent with cars, but i'm terrified to mess with engine timing myself haha.

Hello all. Probably a silly question, but need some help from some of the tuner guys- my RB won't make power unless timing is very advanced (high 20*) on my Power FC. Made another thread about this earlier. This is just a question i'm struggling to find an answer to. The car has little knock and runs good at this extreme level of timing under full boost of 15psi on a GT3582, making ~425rwhp. Seems to peek around 26- 28* under full load, tuner said car runs good but believes the ecu is faulty. I'm going to check cam timing tomorrow and take to a shop to check base timing (don't have timing light!) I'm trying to diagnose why this issue is present- So, am I correct in the following assumption? I'm very new to the tuning/timing side of cars, so this might be stupid: Example only- If my base timing is out say 5* (10* BTDC on idle instead of proper 15* on RB25DET) and the Power FC is reading it as normal 15* as is has no way to directly communicate, would this mean my entire tune would be out 5* (eg when the PFC is at 25*, the engine is actually at 20*) hence the low knock and high timing, as well as when timing is around safe level of advance it makes hardly any power... Please take it easy on me if this is a dumb question, just trying to sort this issue out- car runs good but timing numbers are very worrying!

Thanks mate. I'd love to bin the PFC but I just bought the car and don't have the budget yet, but will eventually be getting a Link when I am experienced enough to go forged bottom end. Will need to buy a timing light during the week it seems

Tuner was highy recommended, i'm in Perth.

I've been reading about all of this, setting the CAS and all. Would the CAS being out cause all the timing numbers displayed by the 'GameboyFC' (haha) be out of sync? Or is the timing is shows what the actual engine is seeing?

Apparently the timing matched according to the tuner, and only reads wrong when not on idle, which sounds odd. Apparently this is why the ECU might be faulty Don't think any knock ears were used either

Apparently the tuner did check it with a timing light- going to go get it rechecked and the CAS adjusted if it's out. Second opinion is probably cheaper than an engine rebuild i'm on pump 98 also

Hello. Recently picked up an R33 GTST, S1.5, and I am very worried about the timing issues. The car ran rich when I got it, which was fixed by adjusting the TPS to correct voltage, but the idle seemed a little off still. I took it and got it retuned, as the last tune was very old and outdated. The car made 425 RWHP on a hub dyno, at 15 PSI. Tuned on Apexi Power FC and a GT3582. The car has very little knock on the hand controller, and seems to run fine. The tuner said however he had to advance the timing a massive amount, and believes the ECU is misreading timing, and it is an ECU fault. The timing degrees is at mid to high 20's under full boost, which seems very high. Again, low knock (under 30) on Power FC sensor. It was running similar timing to this for the last 7-8 year apparently, and had a very similar ignition map on the old tune. What's the go with this? How can I get the timing to a 'normal' level? Has the belt slipped? CAS failed? I am concerned the Power FC knock reading is inaccurate and I don't want this car to explode, as Covid tax meant this was not a cheap buy! Cheers all!