Originally Posted by the bogg

update: Rix car has gotten so fast that he went back in time and is not replying to this thread because it hasn't been created yet.


Lol, looking forward to some updates rix!

Originally Posted by rix

I have been quietly working on my car for a few months and thought it was about time for an update.

I had been running stock 997.1 turbos, 997.2 intercoolers, Protomotive/Siemens injectors, Sachs 764 clutch, AMS turbo/compressor inlet pipes, Europipe exhaust, E85 fuel, and Protomotive tuning. The combination was extremely good in my opinion, the car dyno'd nearly 590 to the tires on the Mainline Dyno @ T1 Race Performance in Dallas. It was also running mid 140mph passes at the Runway Rivalry event in Dallas. This is operated on the same track, and conditions as Texas Invitational. The general rule of thumb is that cars run about 10mph quicker here than they do on a 1/4 mile track. The car was probably trapping 133-135mph in the 1/4, but I did not have the vBox at this time so it's all bench racing.

Something you will probably hear me say if you are around me long enough is WNMP - We Need More Power™. I went with big VTG turbos. For those curious I recommend the Champion 68mm upgrade. After getting the turbos bolted up I had some issues getting the tuning done the way I wanted it. I had been very interested in the Cobb platform since it was announced, so I went ahead and ordered a Cobb Accessport and started working with Mitch @ Cobb getting the car tuned.

Almost immediately the injectors I had in the car were discovered to be way too small. I picked up a set of Injector Dynamics ID1300 injectors, and after the world's longest injector install I was back up and running again. Everything you read on here about Mitch @ Cobb is true. The guy never rests, and never gets impatient. He answers emails early in the AM, late in the PM, and everywhere in between. I have the Accesstuner Race software, so I went ahead and set the car up for the new injectors myself with some advice from Mitch. The reason I am such a big fan of Injector Dynamics is they give you real data. The voltage and flow data they provide for their injectors is spot on. There isn't really any guesswork involved. I pretty much just punched in the numbers on a calculator and used the resulting values.

I will post more information about Accesstuner Race in the future, but for now I am letting Mitch run the show. I open the maps that he sends in ATR and follow along with the changes that he is making, but I haven't felt the desire to make any significant changes of my own yet. I feel like I have a pretty good handle on things at this point. In the future I plan on doing some fine tuning, and will share my adjustments. Things like cold start on E85 adjustments over a wider temperature range, etc.

I'm not too into posting and talking about what I'm going to do, so I have kept most of this to myself. However now I have some vBox data to share that I am pretty happy with.



This is the best 60-130 time that I have gotten so far, out of about 4-5 different attempts. I am collecting the data with the new vBox Sport, which samples at 20hz as opposed to 10hz that the older P-Box/Driftbox models ran.


After getting the boost control sorted out with my car, as well as chasing down a few gremlins after the turbo swap I made the above run @ 5.99 seconds 60-130.

Here is the 60-100 for this run.


60-100 graph from the same VBO file containing the 60-130 data.


Now this is where things get interesting. After turning the boost up I started getting an ignition misfire. I am in the process of putting the PRO in procrastinate swapping the spark plugs to hopefully resolve this. You can see the misfire in the 60-130 graph, as the car recovered very slowly from about the 3.0 second to 4.0 second mark, back to a peak of about .6G in 4th gear. That run was on the lower boost setting. I nearly let out in 4th gear when it stumbled but it pulled through it and felt pretty clean the rest of the way.

Here is a 60-100 that I captured with the boost turned up before my spark plugs gave up.



Best 60-100 time to date. It's a solid .3 seconds ahead of my best 60-130...


I've still got a ways to go, but once I get the ignition issues worked out I'll be back with some more data.