Still undetermined if it's the trans or the LSD itself ...
<Morgan Freeman> Turns out, it was the trans itself.
I purchased two more 4.10fd F23's and dropped the LSD in from the first blown trans and she's been doing great even under the abuse of a track day and 400whp/tq dyno day etc.
It's been almost two years on the dot since my last update. I have made a bunch of enhancements, just a poor job of keeping this updated. Life comes at ya quick!
Mentioned above, I took the gobo to the dyno in Sept '21 and put down ~400whp/tq and overheated / died as soon as I came off the rollers. I was logging the whole thing on the dyno and didn't see anything catastrophic happen so I went on a witchunt, which snowballed into me taking the engine apart and putting in all forged internals, new crank, etc. and the stock cams / harmonic balancer back in. Long story short, I think I the ZZP Stage 2 intake cam spun it's reluctor when the car overheated and I could never get it to run right again. It's tough to know 100% based on what you read on the internet and what zzp says but I put the stock cams back in during rebuild and haven't had an issue since. (
more info)
What happened after the dyno kinda sucked but it did feel good to achieve my goal of 400whp on a tune that I made myself. She was definitely a bit much for street driving but cot **** this powerband was glorious - it also sounded legendary at 7K rpm.
I have never fully built an engine before and had a lot of fun building this one. I went with molnar rods, wiseco pistons, arp everything. Only real issue I had on first start was getting the rings to seat. I washed my cylinders and flooded my oil with gas at least twice during the process and thought I'd never get it. I had to just send it under boost and as luck would have it, it worked!
Buttoned all the above up, I also took out the ZZP valve springs and installed OTTP 82# springs. I'll spare the pics on this but it's a pretty fiddly ordeal.
Now that we're back on the road, next up is aero. My buddy had a skid plate from his Audi he was no longer using so I cut it up and repurposed it and amazingly it does make a material difference! I do have plans on going full send on a front wing as I transition this build towards a more function over form build.
Decided to re-design and 3D print a hood scoop aka Naca Duct. I printed it in PETG and have put in a full track day in June weather without any deforming or issues. The way it's printed helps keep it secured but I also used double sided 3M tape to mount it to the hood. You can really feel the heat coming out at idle, it probably does it's job at speed? If I reprint this I'll bring it to a point at the top instead of rounding over.
After trying a few different ways to build in support, I gave up on the kirkey (driver) seat, passenger still gets to suffer. Insert Corbeau
I also changed the side panels to a digital cammo and will change the hood color at some point as I'm ready for a new look. I took her to Kershaw, SC to Carolina Motorsports Park for her first track night and all I can say is it's an incredibly fun and humbling experience. I have a long way to go on the driver mod and some dialing in to do on the suspension. I don't think i'll ever have big enough nuts to ever drive this to it's limits and will have to live vicariously through other members lol
That's it for now! As always, she continues to be a work in progress (both the driver mod and the gobo
).