CSX3170 Update
We did a test of 3170 last Sunday after months of work on it. It has fresh paint and the original bumpers back on and looks very much like it did when brand new. I did not reinstall the sun visors or wind wings though and the interior has racing seats etc. I have replaced the #16 oil supply hose and fittings, had new seals and O rings put in the Daily dry sump and replaced the
RH valve cover gasket and seem to have solved the oil leak problems. The electrical issues with the FAST system were solved by replacing the engine builders harness with a stock FAST harness. The tune is still way off because the builder just went for peak power and forgot about throttle response and proper air fuel ratios at partial throttle. We fixed about 70% of the problem but still have some flat spot issues due to lean A/F ratios. The smaller engine also needed lots more rear brake bias than the 498 because of lower internal drag. I have a short video of Scott trying second gear with traction control on and it actually worked fairly well. First gear blows the tires off because it still has so much torque even with 20 degrees of timing retard. The rear gear ratio is 4.88 with a 1.73 second gear. Second is good for 88 mph at 9300. It pull really well in second even at low speeds as you can see in the video. We are going to try some more tuning changes with help from FAST and run it next weekend. My fingers and toes are all crossed. I hope this Google video works, never posted one before. Second gear pull with traction Control https://youtu.be/Wh2Z1K88sEE |
The video link didn't work.
But... Are you sure the fuel injection is the right path? Do the adaptable/self-learning system allow you to go in manually, and do they have enough resolution to handle the abrupt changes that happen with auto-x driving? I went through a similar exercise with my DFI system (Accel) where they didn't do the altitude compensation, and in manual mode there were so many tunable parameters with such high degrees of interaction that it was a real nightmare. Given enough time and patience it could certainly be worked out for a custom application but in the end will there be a gain over a set of well tuned carbs? |
Efi
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The system runs in alpha N just like the 498 did, way too radical to do any self learning, the old one worked perfectly in autox. The only reason I changed was to get traction control. I am pretty sure it can be fixed, with tuning we made major improvements just smoothing the base fuel tables and changing the TPS enrichment curve. Carbs cannot handle the g loads and stumble because of float slosh. We are getting 1.5 G cornering and 1.2 braking and accelerating on 200 TW tires now. I am trying to find out how to embed a video from Google drive to CC but so far no luck, maybe somebody on CC will know how and tell me. You Tube is so easy! |
Cant the video upload to youtube? Thta's what I've always used. Photobucket used to work but now they charge $500/year to embed off-site links so all of my pictures are now orphans :(
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It certainly was an interesting experience but the PhDs in HDD servo controllers were able to explain it :) |
Video
I converted the video to you tube
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Will you be at the Good Guys in Scottsdale in two weeks? I hope so. Always enjoy you kicking the boys from New Mexico.
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GoodGuys
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Stop by and say hi if you are at Scottsdale GoodGuys. |
The 2018 rules suck! It looks like they singled you out. It's like the balance of performance in FIA GT class against the Ford GT - weight and HP reductions to give old technology a chance instead of encouraging them to upgrade their technology.
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Keep up the good work as it will come back to you in Spades:):) |
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Jim |
I just sent a respectful memo to the controller of the Goodguys. I just let her know of all the Cobra owners understand that we are not welcome at there shows. I also stated the Corvettes will finally win! Could not help myself. Hope to see you in a couple weeks.
Gary |
This is really unfortunate. I hope they reconsider the rules change. 3200 lbs is ridiculous...might as well run a NASCAR car there :-).
Just like the old days - need to change the rules or cancel races to keep the Cobras from winning.... |
My message to the Controller at the Good Guys got forwarded to Ed. Ed is in charge of the autocross since inception 12 years ago. I will not be able to quote verbatim but here it goes. There was talk about weight class divisions. Two seat car divisions. There is not going to be a restriction on weight ever. Basically run what you brung for now. The vettes and Cobras will battle as always in a two seater class if ever initiated. Now that I have mixed up the works, see you at the races One added note: the autocroass was started on the basis of a street car driven to show and runs. I personally don't care either way. I know I cannot compete with a lot of the cars. I don't even have the correct tires let alone a suspension set-up. Enjoy and love 3170 kicking some arse's Gary
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Weight Limits
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Incidently my car is legal for street driving in California and has plates and insurance I don't drive it on the street because of the danger from other drivers. The 2018 plan was as follows: Form circular sections of mallory metal or lead with the same OD as my frame ID with clearance for sliding. Slide a bunch of weight into the rear 5 feet of both frame rails and then make up spacer tubing that butts against the front caps and keeps the weight in place. We would have a really low CG, 59% rear weight bias and probably be able to use more throttle on them. I think the car might actually be faster because 200 TW tires need weight to achieve maximum mechanical grip. Not doing this will save me a bunch of work! |
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https://www.good-guys.com/hotnews/wp...on-800x581.jpg |
I am glad you won't have to add the weight. Mixed emotion I am sure. Probably would hook up better and of course faster ! The Vettes and Novas shooting themselves in the foot I suspect. Hope to see you in Scottsdale.
Gary |
Scottsdale
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We will see how it runs at Pleasanton tomorrow, if everything goes well we will be in Scottsdale next Thursday. I am just getting ready to load it now doing final clean up. |
Good luck
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Bruce
Adding weight and Torsional Strength is not all bad.... That was the reason we built this plate for KMP259..... and it works .... like closing in the back of a bookcase.... with the sides and shelves it's very wobbly but the minute you put the back cover on the back of the book case .... then it get's very rigid... The suspensions starts working like it should. http://www.clubcobra.com/photopost/d...m/DSC00794.JPG |
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