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Thread: Godson - 1993 Chevrolet Corvette Z07

  1. #111
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    Yup, I figured you would say that!

    I'll try to get some measurements before nats.

    As for heat cycling, did they recommend them to be cycled or not?

  2. #112
    Well don't do it for my curiosity. Only if you're interested yourself.

    Heat cycling is never a bad idea. Not all my sets were heat cycled and I can't say I noticed a real difference, but I didn't back-to-back them either.

    Interestingly, I found the 265/35/18 to be a more "alive" tire in feel than the 275/35/18. Construction was confirmed as the same. One of life's mysteries. The 275s made the car feel heavier and lazier. In my testing (I did back-to-back these same day) they weren't any faster or slower, though. I stuck with the 275s for gearing purposes.

    Edit - the 275s have a deeper tread depth than the 265s. IIRC this was part of the lazier feel from the 275s, but when I shaved my next set of 275s to the same tread depth as the 265s, they still felt lazier than straight up unshaved 265s.

  3. #113
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    265/35?

    It does have a shorter sidewall, so at least that may have something to do with it. We shall see what happens once I get them on and tested.


    Currently trying to figure out if I should try and do a TNiA the week prior to nats as a final shakedown. I could heat cycle the tires then, then test to see if the "issues" I have been having are fixed or not.

  4. #114
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    Seat time is always good.

  5. #115
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    Yeah, I'll see if I have the money, and the ability to get off work.

  6. #116
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    I won't be able to attend the TNiA, mom is being recognized for her 5 year anniversary of being a docent at the KC Zoo. Pretty big deal.

    I'm going to get the oil cooler plumbing changed around a little bit for more added security. Knocking that out tomorrow, and figure out how I want to attack the brake ducts. Got a great idea on the final scenario. If not, the brakes are great and can probably handle repeat after repeat lap. They didn't mind it at HMP.

    Tires should be here later this week.

  7. #117
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    Congrats to your Mom!

    Curious to hear your thoughts on the tires, I may order a set next week.

  8. #118
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    Tires are here, round black and date stamped 4517. For those not in the know, that means the 45th week of 2017. For competition you usually want them to be under 6 months old, but I don't really have a choice. No matter what, they will be safer than the federals which the tread belts were beginning to separate from the carcass. I'll get them mounted this week. No idea if I can heat cycle them on the street safely or effectively. 180 degrees for 5 - 10 minutes is tough with super sticky tires. Might need to do that on Thursday at nats, and let them cool on Friday. I'd prefer to not do that though as I would be driving on 4+ year old Continental contact DW at temperature. That size is 275/295 respectively. Who knows what nats has in store for me.

    Also, I re-routed and heat wrapped my oil lines. I now have a full inch space between the lines, along with a barrier, from the catalytic converter. Much better than the previous setup of less than 0.5in.

    Also, was able to confirm the oil cooler is working, even if barely, it's doing something. I tested it by heatsoaking the engine to 230* oil temp, then took it for a short drive at 45-60mph and temps dropped to 219 and were stable there. Ambient temperature is 70 degrees. At the very least, if the oil temp spikes, I can back off for a lap or two, then get back into it. Previously it would stay up at 260+ for 10 minutes before being under 230.


    IMG_20190821_194307298.jpgIMG_20190817_164855052.jpgIMG_20190817_145349568.jpgIMG_20190817_180100021.jpgIMG_20190828_172041248.jpg

  9. #119
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    Really glad to see it all coming together. Hoping there won't be a lot of drama in the garage at Nats.

  10. #120
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    IMG_20190901_193223457.jpg

    Have had a few chances to run some oil temp checks over the last few days. Still trying to figure out the amount of oil I need to put into it now being I have changed the overall capacity.

    I topped it off after making sure the thermostat had opened, then took it for a drive. And the car happily cruises at 213f, before it would be 220+.

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