build diary
<< | show individual entries | >>November 28, 2007:
There's an unbuilt CMC "Miata" frame on eBay.
It's the same thing I started with. I'm amazed it's surfaced, but then again I did hear of an unbuilt 1977 Caterham in the Denver area yesterday.
I'm interested in the background story of this kit. The seller says that CMC went out of business around the time he took delivery, but the design of the rear control arms is an earlier one that was used before Heikki's car was built - I think that's the case, anyhow. Perhaps it's one of the frames that went through a dealer. The interior panels are more complete than mine were. However, the scuttle is missing. More importantly, so is the MSO which may make it difficult to register.
Still, for anyone looking for a starting point for a Seven here's a good option. There are a few things to fix up - the rear differential mount comes to mind immediately - but readers of this website won't have trouble figuring that all out.
December 29, 2007: 
We've had a nice, wet and cold December.
So while the skiing has been fantastic, the small sports car fun has been curtailed. The Seven has been moved to the back of the garage to make room for more pedestrian vehicles - the garage is two cars wide but 2.5 cars deep. To make it easier to shuffle the car around and keep it out of danger, I picked up these very high-tech toys. They're moving dollies from Harbor Freight and can carry 1000 lbs each. Not bad for $10. We have some fancier ones at work that are a lot more expensive, but this is all I need...
entry 1410
Since I'm working on the exhaust for the rally car, I've become inspired to work on the one for the Seven.
Remember those motorcycle mufflers I picked up aeons ago? Well, one of the reasons I haven't installed them is because I'm sick of cutting up the exhaust again and again. But I have a spare header collector, which means I can build a new setup without having to destroy the old! Time to get to work then.
entry 1411
And here I was being so clever.
The new collector is actually much better than the original one. Unfortunately, it also puts the pipes slightly further apart. This doesn't play well with the inflexible header pipes.
Now that I know more about collectors, I'm pretty sure my original one is a formed weld-on unit with some tubes welded on the end. They're inexpensive, around $35 new. So maybe I'll order another one. I prefer that idea to the alternative of messing with the header pipes!
entry 1412
January 2, 2008:
I was wrong about the price of the collector.
It's not $35 each, it's $35 for two! So I'll have lots of parts to play with then. This will make 4 collectors bouncing around the shop right now.
Last year I took the Seven out for a drive on New Years Day. This year, I went snowshoeing. It's not a friendly year for little sports cars yet.
entry 1413
January 8, 2008:
The new collector is here.
It's obviously a $17 piece. I think I can make it work, but it's certainly not going to just slip on. Bummer. I have some other ideas that might work though. Watch this space!
entry 1414
February 4, 2008:
There's not much action going on with the Seven right now.
We're seeing record-breaking snow and the car is being neglected for the Targa Miata. That's the car I'm building for the Targa Newfoundland, and I'm using a lot of the techniques and skills I learned on the Seven build - such as building a very complex header.
If you're looking for updates, you're probably better off watching that site for the time being.
The Targa Miata
entry 1415
February 28, 2008:
Caterham has announced the uberSeven - an SV stuffed full of an RST V8 and a supercharger.
The headline number 1000 hp per tonne, although I suspect the weight and horsepower numbers have been massaged a tiny bit to get that magical fourth digit. Still, even at 900 hp/tonne it would be quite a ride.
The Caterham Seven RS
What about my own little car? Well, as predicted, it's been sadly neglected for the Targa Miata. I promise to get it out for the upcoming Corvette autocross at the end of March, though. It's time to stop trying to alter the car and time to just take it out for a blat once in a while.
entry 1416
March 11, 2008:
I spent Sunday at the track.
No, I wasn't driving the hibernating Seven, I was testing the Targa Miata. But I did get a chance to drive the FM Westfield. This car's shown up here a few times and it's turned into a real sweetheart on the track. It has a slightly different character than mine but it's still a ball to drive. Well, Bill spent last week sticking a turbo on it and it now makes somewhere around 250 hp at the wheels.
Does this make the car an unguided missile? Far from it, the chassis is fully capable of dealing with the power/weight ratio. The straight line speeds is, as expected, ridiculous. But the friendly handling remains, and the car eggs you on to push harder and harder like a good Seven should. It only took a couple of laps to acclimatize myself to the car, despite the fact that my last few track days have been in a Miata with relatively soft rally suspension. Soon I was playing with power oversteer in fast sweepers and prodding at the car's limits everywhere except under braking.
It was a completely different beast from the Atom. Where that car was edgy, this one is friendly. And inspiring. I'm trying to think of what I can do to my car to take it to the next evolutionary step...
entry 1417
April 5, 2008:
Well, it was going to happen eventually.
My lap record from April 2006 fell today. The old record of 1:03.777 (clockwise) was blown away as Bill turned a 1:02.455 in the Westfield. Remember, the car's turbocharged now so the distance between the corners is a whole lot less! I got the chance to drive the car on the track - a much tighter one than Pueblo - and it's a bit more of a handful in the smaller venue. Catching power oversteer at 70 mph in the middle of that downhill sweeper made for an exciting ride.
Luckily, Bill wasn't quite able to match my 1:02.471 running counterclockwise, having to settle for a 1:02.807. Not too shabby, and with a little more seat time and some brake tweaking that record could easily fall as well. Or perhaps I'll have to do it myself, I can usually pick up a couple of tenths on Bill in the same machinery...
entry 1418
June 7, 2008: 
My friends Axel and Steffi came to visit, and they brought their friend Andre along.
Axel's known me since the beginning of my little Seven obsession, and this was his first chance to try the car. So I dusted the poor thing off, filled it with fuel and it burst back into life after a bit of a hibernation.
Axel reported that he actually fits quite well, something that's never been true of any similar car. He put a fair number of miles on it as we travelled around the area visiting various spots, such as the garage housing the berzerk turbo Westfield. That got him grinning.
Andre is a Caterham fan who's had the chance to drive a CSR 260. So it was quite interesting to hear his feedback on the car once we made it to the track. The track? Of course.
entry 1419
We managed to talk our way on to the track for a little play time.
All of the toys came out, as both Andre and Axel were eager to try the Targa Miata out as well. And of course I went out for a few laps. Well, I had to.
Both of the visitors absolutely loved the car. Axel spent all of his time countersteering and laughing, while Andre was turning some pretty good times. Both really enjoyed themselves.
For me, it was the first time to have the car on the track since last August - and the first time to drive it on the track in the "forward" clockwise direction in a long time. I've been spending every possible track minute in the Targa Miata, preparing it for the upcoming race. Driving the Seven was a bit of an eye-opener to be honest. I'd forgotten how physical it was. The brake pedal is rock-hard and needs a good firm push, the throttle pedal is a bit heavy (due to an extra throttle return spring that's an experiment) and the steering requires a surprising shove. Of course, everything in the Miata is power-assisted and it's a more delicate car to pilot - as it has to be, since I'll be driving it for a week of 12-hour days. But would the Seven be more effective if it was a bit lighter to drive, or would it simply be more effete? I'm not sure, I'll have to think about that. I might back the brakes off one more master cylinder size just to try.
The Seven is also set up to oversteer. Now, this is quite a bit of fun and you never have to worry about the front sliding out on you. But my driving style must have changed somewhat over the past months because I initially thought the car had a problem with the rear tires! A fast lap is mostly spent managing the rear. Very entertaining, but perhaps a little less hairiness might make the car easier to drive and quicker, without giving up the ability to rotate it on a dime. I have some ideas, this will be fun to try. Don't get me wrong, the car doesn't handle badly and it's still a complete riot. I was turning mid-1:04s which is pretty respectable - my best time in this configuration is a 1:03.3. But I wonder if it can be improved with a few fairly minor tweaks to the alignment and master cylinder sizing.
The Targa car benefited greatly from my experience with the Seven, and now I think it's time for the pollination to go the other way for while.
entry 1420
July 7, 2008:
Autocross time!
I decided I'd been spending far too much time on the Targa Miata, and that it was time to take the little monster out again. And it felt good. The car is just so quick, even at 9,000' above sea level. It dances around so well that I'm able to exploit it fully quite easily.
I took the fastest time of the day in a fairly competitive race, but the Seven really is in a different league than most other cars. I could tell when I'd put in a good run by how much I was giggling when I got to the end.
entry 1421
July 15, 2008: 
Car for sale!
Well, briefly. Chris Fiaccone's bike-engined car was one of the four cars seen in the Car and Driver article. It was beautifully built and looked like a hot rod version of a Locost. The fact that it has a 900cc bike engine and weighs under 1000 lbs doesn't hurt. When Chris decided to put the car up for sale, I told him I'd mention it here.
But it's not for sale anymore. I also mentioned it to my coworker Brandon. Okay, maybe "mentioned" is the wrong term, I called him up and told him to buy it. He's wanted a Locost for a while and this one is a fine example at a very reasonable price. He agreed, and now there's a third seven-style car hanging around Flyin' Miata. It would seem they're contagious. And it's going to be tough to keep in front of Brandon at the autocrosses, we usually have pretty good battles when we're in similar cars.
entry 1422
August 1, 2008: 
Hello, police? It seems someone has stolen my differential...
While this is true, it was me who stole the diff from the Seven.
I was hoping to avoid this, but I need the Guru for the Targa Miata race car. The Seven will get a Torsen in exchange. It'll be interesting to see how it affects the behavior of the little car - has the Guru been masking any bad habits, or will it make no difference at all? I'll have the diff back in a week after the ring and pinions are swapped around.
entry 1423
Since it's out, here's a shot of my PPF substitute.
I don't think I ever took a good picture of it before. This bolts on to the front of the diff, and then three bolts are run through the side of the transmission tunnel. Everything was still nice and tight when I removed it and it's undergone a fair bit of abuse in the last few years - so I think it's fair to call this little bracket a success.
Less successful was the fact that I managed to pull the driveshaft out of the transmission while removing the diff. I'm not sure I have access to that without pulling the interior transmission panels - I hope I don't have to do that!
entry 1424
August 12, 2008:
It's time to put the Torsen in the Seven.
After all, the FM Open House is this weekend. That's the fourth anniversary of the Seven's track debut. And this year, I have some serious competition. The Westfield was close last year, but of course it's grown a turbo since then. The turbo Caterham isn't liable to be a big challenge, but Brandon in Chris Fiaccone's old bike-engined car is liable to be a big threat. Brandon did really well with the car at a track day last weekend and he's a good driver. Yikes.
Of course, that's assuming I get the diff in. It's a real puzzle, twisting and turning the differential to get it in and out. I haven't stumbled across the magic orientation yet, and it gets tiring with a 75 lb diff. So it's time to take a little break and let the diff think about what it's done.
entry 1425
August 14, 2008:
I'm never taking that diff out again.
What a royal pain in the butt. Anyhow, it's in place. The car's all buttoned up and ready to defend its honor at the track. Since the car hasn't been altered significantly in the last couple of years, if I'm going to go any faster it'll all be up to my driving. Let's hope I've learned something with the constant track time this year.
entry 1426
August 18, 2008:
While taking someone for a ride at the Open House, my left front fender was shaking more than it should.
Before we could get back to the shop, the front stay broke free and started waving around. I slowed, but it quickly grabbed the front tire and bent the remaining stay. I was able to stop the car before anything really terrible happened. A roadside fix that involved rebending the 1/2" bar and securing the pieces with a piece of string got us back.
A bit of bending and some welding and voila. Fixed.
entry 1427
Time for the FM track day.
The Caterham pulled 305 hp at the wheels the day before. The Westfield was all tuned up with a lighter aeroscreen and methanol injection. And of course, the dark horse: Brandon. It wasn't going to be easy keeping ahead.
I missed the first timed session because I was making sure the track day was running smoothly. Ah, the price of being the organizer. But by the time the second one rolled around, I was at the front of the line. Everyone watching commented that I was driving hard - it looked as if I was on a mission. And I was! My goal wasn't just to break the track record, but to defend myself against everyone else who was doing the same. My time for that first session was 1:02.478. The old record? 1:02.471. So I was back on my old pace immediately. Bill was a bit further back and the Caterham wasn't in the hunt. Brandon was dealing with a broken axle but was going to have his car up and running soon.
The next session saw me get down to 1:02.3. So there's a new record then. Brandon didn't manage to put down a time and Bill was a still a little ways off.
I got a shock after the third session, though. I was slightly faster but still in the 1:02.3 range. Bill pulled out a 1:02.1 and Brandon was also down in the 1:02.7 range. As you can imagine, it was game on.
I pulled my windshield off while Brandon headed out with some of the slower groups to work on his line. Bill announced his intention to see a 1:01 on his timesheet. There was a lot of excitement in the pits. Brandon and I went out in the slow group just before our session to make sure the tires were partially up to temp - and it began.
I knew I would have to be more committed than ever, but without overdriving. It's a difficult balance. My first lap wasn't all that fast, the tires hadn't reached full temperature yet. On the second, I overcooked the entry into turn one and went around the corner in a big slide. Probably my best drift in the car - and definitely appreciated by the spectators - but slow. So it was all down to the third lap.
I nailed turn one, then got a quarter-second of full throttle in the transition into two. That's an area of the track where I'd found a little bit of time. The next couple of corners were smooth and quick, so it was all going well. I didn't take too many liberties through the chicane to keep things tidy. Down the back sweeper, I had the car in a four-wheel drift with a ridiculous slip angle, throttle pinned and a silent scream echoing around my head. It's a big commitment, but required to get a fast time. Brake hard, around the hairpin, then make sure I get a good drive off the slow corner on to the straight. It sure felt good.
And it was. When I pulled into the pits, a coworker came running over yelling "you did it!". My time was a 1:01.985, the fastest any car's gone around the track in either direction. Bill wasn't able to improve on his 1:02.103 and the Caterham was well behind. Brandon? Well, he managed a 1:01.988. That's 0.003 seconds behind me. At 70 mph, that translates to 4 inches. 4 INCHES. Wow, what a race.
The track record took some damage, that's for sure. Three cars beat the old mark, but I managed to beat it more than anyone else. So I stayed on top again. And I did it with driving, because the car hasn't changed since I set the record in 2006. But Brandon's a worry. He's still learning that car and there's lots of development left in it. I have a few things to do to to the Seven, but unless the upcoming ECU change unlocks some big horsepower I'm not liable to tear off big chunks of time.
There's another track day next weekend. I fully expect Brandon to wrest the record away from me. But he's not going to get it without a fight.
entry 1428
August 24, 2008: 
There's an old saying in racing: "To finish first, you must first finish".
Brandon would like to amend that somewhat, to "To finish first, you must make it to the start line". Right after our battle at the Open House, he started having some problems with the carburetors on his car. He spent most of the week trying to chase down the cause but wasn't able to get it running in time. A frustrated guy. So our epic battle for the lap record is going to have to wait for a while.
However, Bill was only a hair over 0.1 seconds behind and was also gunning for the record. He spent part of the week fitting a front sway bar to the Westfield and fixing a bushing problem that had one front wheel moving back and forth by about an inch (yikes!). So he was primed for battle. Me? I left the Seven in the trailer after the Open House. It's not that I'm cocky, I just didn't have anything I could do other than replay the track in my mind.
The weather was hot with a high of 96. That's not good for lap times, and the turbocharged Westfield was down on power. I attacked the track, looking for little hidden pockets of time and found a couple of unexpected spots. On my second session, I did manage to knock a tenth of a second off my previous time, dropping the record to 1:01.893. I'm not even sure what lap it was, honestly, as I didn't think I had any clean ones in that session. I'd been fighting a wayward tail on the car. Later in the day, I was driving more cleanly and taking advantage of my newfound little secrets in the track, but the high track temp prevented the times from dropping any further. Bill turned a 1:02.187 - not exactly slow, but not quite as quick as he had been last week.
So that's a successful day. Everyone else went slower than they had the week before, in some cases by a fairly significant amount. That one quick lap helped me knock a little more time off the record and keeps me safe for a while longer. Whew! Now it's time to park the Seven for a while, as I'm leaving for the Targa Newfoundland in two weeks.
entry 1429
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