Z Greek Posted July 4, 2012 Share Posted July 4, 2012 Just put my new L28 for the Chumpcar on my buddies run-in stand. Will have it in the car and on the chassis dyno towards the end of the week. Sounds pretty good, hope it makes some power! IMG_1175(1).MOV Quote Link to comment Share on other sites More sharing options...
roger280zx Posted July 6, 2012 Share Posted July 6, 2012 Sounds pretty good, hope it makes some power! +1 Quote Link to comment Share on other sites More sharing options...
PMC raceengines Posted July 6, 2012 Share Posted July 6, 2012 Well done mate good luck for the dyno Quote Link to comment Share on other sites More sharing options...
Z Greek Posted July 6, 2012 Author Share Posted July 6, 2012 Well done mate good luck for the dyno Thanks Peter, I'll let you know what it makes! Quote Link to comment Share on other sites More sharing options...
Z Greek Posted July 13, 2012 Author Share Posted July 13, 2012 Practice day at the track. Engine was strong, but we had a fuel tank venting issue which had us making an emergency shut-down. I was riding with one of my team-mates who is very experienced track driver, I was riding in the buddy seat we installed. All of the sudden, it felt like I was being rained on from the back. For a split second, my mind said "where the hell is that cold water coming from, and how is it hitting me in the back?" Another split second later, both of us realized it was fuel. Power off, ignition off, coast off to the side of the track. We had just re-designed our fuel vent burp tank. We saw the error in our design, and fixed it, but too late for more testing, or lap times. Car will race in an actual conference race tomorrow, and a couple more over the weekend, good opportunity to get some time on the new Chumpengine, and generally get the car ready for next weeks 24 hour Chump race. We painted the car Sunday night, and put the graphics on it at the track today. Looks a little too good for a Chumpcar! I'll post again after the races tomorrow, and let you know how it does against "real" race cars! By the way. Since we decided to paint it, we did not have time to put the car on the dyno. We will get it on before the Chump race, and I will post numbers, good or bad! Quote Link to comment Share on other sites More sharing options...
Z Greek Posted July 14, 2012 Author Share Posted July 14, 2012 Got a couple of lap times today on the new chump l28. Lap times are about the same as the old engine. Engine runs well, and runs strong through first, second, and third gears. Fourth and fifth, it starts to lay down, and will only pull about 5,000-5,200 in fifth down our long front straight. The old engine pulled 6,200 on the same straight. The engine has DRAMATICALLY more power through the first three gears, and through the twisty part of our track. We are running a welded 3.9 R200, and wheel spin is dramatic out of the tight corners, but it runs out of poop on the long straights. We are running SM needles, and have the nozzles down 5 and 1/2 turns. Timing is 35 degrees total. Plugs look very lean on a hot shut down. We are currently running a stock cam driven pump. We are installing an electric pump tonight, and installing a fresh set of plugs to get a read. I'll re-post after our heat races tomorrow. Engine shows great promise, but disappointing to not see it at it's full potential. Quote Link to comment Share on other sites More sharing options...
Z Greek Posted July 14, 2012 Author Share Posted July 14, 2012 Off to the track. Ambient is going to be 10-20 degrees cooler today (high of 80 F), with chance of thunder storms. Hope it stays dry, and hope we found some top end out of the engine with fuel delivery change! Quote Link to comment Share on other sites More sharing options...
HowlerMonkey Posted July 14, 2012 Share Posted July 14, 2012 It might be the cam timing position is more suitable to lower end power. Quote Link to comment Share on other sites More sharing options...
Z Greek Posted July 14, 2012 Author Share Posted July 14, 2012 It might be the cam timing position is more suitable to lower end power. Good thought Monkey, cam was degree'd on the stand, I am confident at where it is at for now. We may monkey (so to speak) with it on the dyno next week depending on how the weekend turns out. Main goal is to get it to make some power, and be reliable for the 24 hour Chump race next weekend. Just got back from the track after the morning session. We definitely made some progress with the electric fuel pump, we finally have some color in the plugs. However number 5 plug wire fell off the first lap, so we raced with a 5 cyl the whole time. Lap times stayed the same, so I am hopeful for the afternoon sprint at 3pm with a 6 cyl Z! Quote Link to comment Share on other sites More sharing options...
Z Greek Posted July 15, 2012 Author Share Posted July 15, 2012 OK, back from the track, we just finished our afternoon heat race. We were in a field with mostly pro3 Bimmers. Engine finally is coming to life. Turns out they run better with all 6 spark plug wires on. We were running on really shot Toyo 888's, and ran in the middle of the pack with some very expensive company. The car ran consistent 1:43's compared to 1:47's with the same driver with the old engine during the last Chump race. I am pretty proud of our old Chumpcar, and particularly my L28. We will finally get it on the dyno next week, and see how close our seat of the pants tune is. Next Saturday, the 21st, we hit the track for a 24 hour Chumpcar enduro. I get to drive 3) 2 hour stints, assuming the car stays together. I was not able to drive the car this weekend as I do not have a conference license. I cannot wait! Quote Link to comment Share on other sites More sharing options...
Z Greek Posted July 23, 2012 Author Share Posted July 23, 2012 CHUMPDATE Well we finished 9th out of 30 cars at the 24 hour Chumpcar enduro in Spokane, WA this past weekend. We had a blast, and the car ran great. We had an electric fuel pump fail early, which cost us about 20 laps, and then broke a rear wheel stud changing tires which cost us probably 20 more, I also spun, and made an off road excursion that cost about 10 more laps (I pulled the wiring off of the electric fuel pump when I went off road and had to be towed back to the pits) or we might have been on the podium. (I know a lot of what ifs, and if it was not for that!) My engine ran FANTASTIC. Water temp was rock stable at 190, and oil temp peaked at around 225 during the heat of the day. I ran the beast up to 6200 in 5th a number of times, with 3.9 R200 rear, so the car goes! Huge thanks to Peter from PMC for all of his advice and mentoring. My buddies/teammates did sneak it onto the dyno last week while I was traveling, and they fessed up during the race. The engine made 178 horsepower to the wheels on their new Dynojet 24. The old engine made 136whp on the same dyno. I will try to get them to print me a sheet so I can post it. Ambient air temp was over 90F when they ran it, and maybe even hotter inside the shop. They made one pull with the air cleaner off, and made over 180whp. There was only one car on the track that could out pull us on the straits, and it was an E36 Bimmer (I know, how is an E36 a Chumpcar?!), and it just BARELY out pulled us. The Bimmer won, but was dropped a place when they discovered the ECU had been "chipped" during post race inspection. Lets see, you some how manage to convince Chumpcar officials that you can buy a running, driving E36 for under $500, and then you still have to cheat to win? What a bunch of douchebags! My buddies may run the Z one more race this fall, and then the engine comes home and I'll open it up to see how it fared. Quote Link to comment Share on other sites More sharing options...
ArchetypeDatsun Posted July 24, 2012 Share Posted July 24, 2012 Nice man! Quote Link to comment Share on other sites More sharing options...
PMC raceengines Posted July 24, 2012 Share Posted July 24, 2012 Well done mate finishing a 24 hour race is a good win, well done pmc Quote Link to comment Share on other sites More sharing options...
MidnightRider Posted July 24, 2012 Share Posted July 24, 2012 I had to read this thread just so I could figure out what a "chumpcar" is.. Quote Link to comment Share on other sites More sharing options...
Z Greek Posted July 24, 2012 Author Share Posted July 24, 2012 I had to read this thread just so I could figure out what a "chumpcar" is.. Administrators: I know my thread has strayed away from the 6 cyl. forum, but this thread started as my L28 build for my Chump car, and it looks like a lot of people don't know what the hell Chumpcar racing is. I will return to talking specifically about my engine after this post (I will be posting dyno sheets today). If you will allow me to explain briefly: Chump Car World Series is a race series put together by a great fellow named John Condren. John has raced many different cars in many different series, over several decades. I hope I am not putting words in John's mouth, but I think he put Chump together as a more serious alternative to Le mons racing. Le mons has somewhat of a circus atmosphere, where it is my understanding that other competitors can vote to have a car they don't like for some reason, destroyed. Not for me. Chumpcar is the cheapest way to get lots of seat time in real wheel to wheel racing that exists (over the weekend, for instance, I drove for a total of 6 hours, 2 hours at a time. The format is different race to race, city to city, but they are all endurance races of 7,8,12,16, or 24 hours. That's right, around the clock! In three years, John has grown the series to 64 races in 3 countries. I guarantee there is one at a track near you, CHECK IT OUT! The premise of the series is you must start with a car that has an actual internet value of $500 or less. Here's what that means. Find 10 craigs list, ebay ads, or any viable for sale ad for your car. The car must be "running and driving." The average of these 10 ad's is your aiv. Like it or not guys, they made so many S30's and S130's, and they had such a rust, and owner abuse problem, that this is a pretty easy task for one of our cars. And what a fabulous platform to start with! The car I have been driving, for instance (I do not own the car, I helped build it, and provided the engine), has an AIV of $435. All of this "proof" goes in your log book, and is open to adjustment at tech-in. Any "racy bits such as headers, urethane bushings, coil over shocks, etc, add to your aiv. If your aiv is over $500, you will be assessed "penalty laps, and they add up quick! Even in an endurance race, you don't want to start even 5 laps behind. On a 2.25 mile road course, that is like starting 10 minutes behind, a long road to overcome! Anyway, that is about it. If you are interested, go the the website, and check it out. Chumpcar.com Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.