The Build Of The Beast
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By funkymonkey · Posted
According to @acsplit apparently the forum is being migrated from one server to another so should be back up and running once the migration is done. -
By TurboTapin · Posted
I thought I would share a few fun facts about Haltech products that I've learnt with their use that they don't share on their website. Haltech GPS speed - Extremely slow to react. It's fine for puttering around but I have no idea what speed I'm driving when in WOT due to the slow response time. This was always going to be temporary as I need mechanical wheel speed for eventual torque management, but it has just been bumped up a priority or two as it's a nuisance. Haltech I/O Expander - You often hear the response time is slow due to canbus comms, but I could not find concrete evidence and Haltech makes no mention of it. We'll now I have it. I mentioned in an earlier post that I thought my WMI mechanical pressure switch was causing a delayed response from my AEM WMI Controller to my ECU. My WMI begins to operate at 11psi, but my ECU was only getting an "On" signal around 19psi. After removing the pressure switch, there was no change. Luckily I connected my WMI Controller directly to the ECU the morning of my Dyno tune and there was a large improvement. I get the "On" signal around 13-14psi now. These remote IO boxes should be marketed for only non-critical I/O. -
By Dose Pipe Sutututu · Posted
Best option. A cheaper option is a Xtreme Twin Plate, Organic Sprung Centre -
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By joshuaho96 · Posted
Transmission synchros feel pretty bad at this point in my car and sometimes the clutch feels like it has an inconsistent engagement point in the pedal travel. I figure if I'm going to swap in a new transmission I may as well also put in a new clutch. Obvious candidates are ATS's pull-type twin plate carbon clutch, Nismo Super Coppermix Twin, or some organic clutch option I haven't figured out yet. I have searched this stuff to death at this point and still don't feel all that confident in making a decision. Target power is not much. ~330 kW at the wheels max. I ballpark the torque spec at 600 N-m. The stock clutch feels a little light so a little heavier is ok but I would say no more than 15-20% additional pedal effort. For some reason most clutch manufacturers want to keep this stuff a secret but the Coppermix Twin is 950 kg clamp load so I figure it can't be too much heavier than stock. The hang-up I have is some people mentioning that the clutch is very grabby which sounds like a pain. The stock clutch is almost too easy to modulate so I don't mind if it requires more precision than that but I don't want to deal with something that feels like I'm getting rear-ended at every traffic light. Also I see some mention of the release bearing carrier sizing requiring some work which sounds like something that might complicate installation? It would be good to know exactly what is needed here for a 1995 R33 GTR. The ATS clutch is supposedly the best but I've seen some complaints that they wear out easily and also slip when cold. I don't know how much of that is true but the cost is also huge compared to even the Nismo Coppermix twin plate. It's also unsprung which normally I would reject immediately but supposedly carbon clutches don't need it. The higher clamp load at 1300 kg is also a little concerning but to me more clamp load seems like it inevitably means more pedal effort and also more strain on the engine crank thrust bearings. This is a street car and despite being a weekend car I seem to spend a lot of time crawling in severe traffic congestion with it anyways so I will gladly pay to have something that is easy to drive on and will hold the power with no unexpected headaches. I really don't want to do a clutch twice.
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