orthofrancis

Wow - this is truely awesome - I'm impressed. I would think there is some more torque and HP to be gained around 4500-7000 RPM, as evidenced by all the other GT3 engine types and their runs vs your flat curves. I imagine it's some tricky/time consuming stuff to eek out those last bits.

What do you think your total hours on just the engine were? Maybe we can guess, and you tell us.

I'll go for 100 hours.

Tom@TPC Racing

Thank you. Yes, you are correct on the mid-range, TPC has built 4.0 engines with more mid-range punch. On my particular engine the stock cams are max'ed out to the 13.5:1 compression pistons. To make more hp/torque at mid and upper range I need cams with more ovelap for cylinder scavenging. For now the tune is very safe and the power gain is satisfactory. I am already exploring cam options for next Winter's project.

I didn't keep tab on the hours. The project spanned across 37 days(evenings and weekends). I used up a lot of hours unnecessarily and obsessively measuring repeatedly, machining, re-doing from mistakes, and re-doing from change of mind. I am going to say closer to 150 hours. If it was a "follow a formula" type of project without the need for custom machining, cc'ing pistons for calculations, then it should be less than half of 150 hours.

ngng

Tom, impressed you assembled most of this with one hand while recording video. Imagine if you had two hands??

Tom@TPC Racing

Haha. Thanks Ng.

Tom@TPC Racing

This is the last big ticket item for me for a while. The MoTeC V2 camera will sync seamlessly to my CDL3 dash. I look forward to playing with the i2 software. Time to stop tinkering and start driving. I signed up for a track event this weekend but it might cancel due to snow. Ugh.

ngng

Do you like the MoTeC stuff? I hear horror stories about the software.

Tom@TPC Racing

Works fine for me.
Here's Motec i2 data overlay of my best lap from last Summer(black lines) with the 3.6 engine to my best lap from last Sunday. The cursor shows a 7.3mph gain from the 4.0 engine. The rest, well, last Sunday's ambient temps was mid-30's to 40's F, the tires were R7's with 18 heat cycles from last Summer that were stored frozen for months, and MOSTLY I was just not driving as well as I did last Summer; braking way too early and too much, and less consistent. If the best parts of the two overlay were combined then would be a pretty good lap. Looking forward to warmer weather and fresh tires!

Tom@TPC Racing

Here's the animation function of the two laps in a youtube video. Kind of fun to watch. Pardon the background typing noise.

Tom@TPC Racing

Looking at the Throttle Position trace between Turn 9 and 10, it is amazing that getting on the throttle 1 second sooner with the old 3.6 engine holds up to the 70whp increase of the 4.0 engine! #datadoesntlie #lovedata

ngng

I've got another channel you can should add

Tom@TPC Racing

Awesome. Fearometer.

Tom@TPC Racing

I haven't driven my car since that one cold day in April but I feel the need to do another project in the little bit of spare time that I have. These projects are essential for me as an outlet to the stress of everyday life. Its me, the car, hand tools and don't answer the phone for like ten hours is total bliss. So, ever since I was a kid building TAMIYA car models I've always liked car with fender flares so lets go with .2 Cup fender flares. This time is the real thing, not 1/24 scale!


Here's the Porsche Motorsport .2 Cup fender flare pieces painted.



I purposely let my finger nails grew longer to scratch & peel off the portion of clear film that the bumper winglets will overlap.



As you can see in the 4 pics below the inside of the bumper winglets isn't flat, each one have a flap and bump to prevent from seating flush on plain surface.






Without using multi-dimensional modeling equipment a combination of measurement with approximation and intuition is needed to determine the area to be cut.


I had a little moment of second thought with saw in hand but F-it, lets cut up a $7K front bumper!



It took multiple cuts to have .2 Cup winglets fitted to .1 bumper. One cut at a time it gets closer to fitting.





Its hard to fathom I spend 3.5 hours measuring, marking, cutting, and fitting the first winglet.
This is the end of Part 1, with winglet fitted. NOT a direct bolt-on!

bmwtye

Welcone to the Cup front flare club. If you want to make life easier for part 2, which is attaching the flares to the fenders, you should consider picking up .2 cup fenders which are already precut for the flares. They are cheap

997 503 931 96 Fender Left 997 GT3 Cup 10- $494.93
997 503 932 96Fender Right 997 GT3 Cup 10- $531.53

And then add the cup fender liners as well.

ngng

does the car turn in better with wider front tires?

Tom@TPC Racing

Usually does but not always. And there can be too much front grip for entry relative to the rear grip on exit.
The goal I aim to achieve is more threshold braking with wider and taller front tire.