Hi Folks.
It's been a long time between posts, and I've made a lot of progress on improving the car since my last post in Jan. I will attempt to fill you in on recent efforts, but let's jump straight to the present. I spent the day at Phillip Island yesterday and managed a new personal best... 1:57.5!! YEAH BABY!!!!!!!!!!!!!
Another recent achievement (last Friday) was to finally get the Adaptronic to take control of the inlet camshaft timing. Yep, I got VVT working. It hasn't worked until now so the inlet camshaft has essentially been in the "fully retarded" position. Well, I have to say, I was surprised at how much difference it makes. It punches really hard in the mad-range now, which has the effect of absolutely hauling out of tight corners. Turn 3 (Honda) and turn 10 (MG) at Phillip Island are now an absolute grunt fest! It's awesome!! I don't know how much time I spent testing the various parts of the VVT system (VVT solenoid/cam triggering), but in the end it came down to an inappropriate output selection in the ECU. I just had to select the right signal (VVT1 duty) to output from the ECU.
I've had no issues with the ignition since installing the Toyota coils, so that's a good news story too.
The biggest electrical issue that I have is electrical "noise" causing spiky and noisy signals such as TPS and VVT1 position. I've tried shielding the TPS cable and filtering the signal wire, but it had virtually no effect. I think I may have a grounding issue. More research and investigation required. Noisy TPS signal messes with how it runs, because every time it spikes by say 20% for an instant the ECU throws in more fuel. It's not preventing me from racing, but it needs to be resolved.
I also managed to pull 20kg out of the car. I'll post pics and the story another day, but first, another good story...
The Vic team took the victory in the VIC vs NSW annual face-off held at Winton in March, and I was there to share the victory!! I didn't take any points for the team, but hey, I was there. Thanks team!!!
I'll close out this post with a question that has been haunting me for the past 3 months or so.... What sort of camshafts should I install into this engine?! I've looked at lots of different profiles and chatted with a few people to get their perspectives. Here are some dot points to guide your feedback:
* I don't want a "peaky" race engine that needs to be above 6000rpm to be making power.
* I want to stick to a 7500rpm rev limit, and I'd like to be shifting by 7200rpm.
* The head has been worked to flooooooow. I have installed 1mm over-sized valves on the intake and exhaust, and the head has been ported by a pro. In other words, it's ready for "bigger" cams to really get it breathing.
* I want this build to last, hence the low-ish rev limit. I know that more revs = more flow = more horsepower, but I'd rather have an engine that lasts.
What do you recommend? If you've got "big cams" please tell me your story.
Lastly, a couple of pics, because who doesn't love pics!!
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