John Parsons

I just bought a 2009 SR8 and got it home last night. It solves my gearbox issues in an over-the-top way, lol. The car has a Stack dash setup, and I want to review the wiring/harness/sensor setup. So I...

Quaife tech sales got back to me today with a complete parts list. They have no 4.11 ring and pinion sets left, but still do have a 4.125 set in stock, along with all other parts I need, and even have...

I did reach out to Quaife directly today, and, as expected, they referred me to Radical. After some discussion, they agreed to look through their inventory and see if they had any parts left since the...

Charley -- I haven't. I spoke with Sean at SMR, and he was going to talk directly with Quaife, since we both believed that Radical probably has no stock of replacement parts. I didn't want to confuse ...

Anybody know where if there's a setup guide for the ring and pinion? Robert Burgess at Radical Canada said that one existed, and that if I used it, I can probably replace the R&P myself. I looked...

Yes -- it could just be the bolts aren't good enough. Is putting in 8mm bolts an option?

Richard -- I wonder if you should have your torque wrench calibrated? That failure rate sounds like over-torqued bolts to me....

Brandon, I'm using the Hankooks -- which are available at Amazon, and arrived in about 5 business days.

Mine's a Tilton dual disc setup.

Sorry to hear about your bad day at the track. I had a great weekend last week, but my gearbox has me a bit down today. 🙁 I've pulled my front rotors and calipers off the car and compared various meas...

New information: my gearbox is a Quaife QBE58G, rated at 350hp. The newer cars use the QBE72G, which is rated at 450hp (bigger gears, and more distance between lay and pinion shafts). The wear I see o...

Thanks Charley -- I had thought of that too (spare car with a later spec gearbox). Though the gearbox in the car doesn't look like a Quaife/PTEC. Is that a Hewland? In terms of repair of mine, I wonde...

I'm doing my annual gearbox teardown and inspection, and my ring (crown) and pinion are a mess. Some really significant wear -- wondering if somebody out there might have an SR8 gearbox in good shape...

Here's mine from a sequence of 3 good laps... Attachment : Screen Shot 2019-05-02 at 3.11.00 PM.png

What sort of longitudinal acceleration are you seeing on braking? I'm seeing numbers maxing out around -1.3. Does that mean I've got a lot more brake than I'm using?