Sonofthehill's stock engine 240k mile 99 MKTURBO 12 seconds on all seasons thread - Page 7 - Miata Turbo Forum -Boost cars, acquire cats.

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Old 09-01-2016, 12:26 PM   #121
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Oops, 340 treadwear all seasons. For some reason I keep thinking they are 320, maybe that's what my truck has?
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Old 09-01-2016, 04:43 PM   #122
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I've tried old federals before, they won't hook even if you shave em.
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Old 09-01-2016, 04:48 PM   #123
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X2 on the federals. That's what I did the drag night in my car with. They were horrible.
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Old 09-01-2016, 08:05 PM   #124
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Ok, thanks for saving me the hassle and wasted track day.
I will keep trying while I save for tires. If I can make a good run with a 1.9 60' time it will be under 13.
On the subject of tires, I am looking at MT street bias but my wheels are an inch narrower than the recommended smallest size. I have a 6 inch wheel and I want an 8 inch tire. Will the tire shop even be willing to mount them? If so what kind of problem will I have at the drag strip?
I don't want to run drag radials, but they are available in my size.
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Old 09-01-2016, 08:46 PM   #125
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it's good to have that squish for drag racing. some places will fuss over it, some wont. go to the ones that wont

bulging tires are bad for cornering, but good for drag. you want to air em down and get maximum footprint front to back and side to side


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Old 09-02-2016, 12:52 AM   #126
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Nice picture!
"Front, back, side to side"
Oh sorry.
So air 'em down to like what, 18psi or so.
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Old 09-05-2016, 08:26 AM   #127
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I recommend an M&H 7.5/23-15 slick, which is designed for a 6" wheel. That tire will easily get you in the 1.7 60' mark. You will need a spare set of wheels because you will need to drill the valve stem hole to run tubes. You will never, ever be able to air them up without tubes.

Slicks take a little getting use to. The sway is a bit unsettling at the big end of the track, but you will never go back to running anything else at the dragstrip unless someone makes a drag radial that actually works in the sizes we need.
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Old 09-05-2016, 05:43 PM   #128
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Thanks for the recommendation, I just found the M&H slicks. I asked some of the guys at the track today about them and they have a strong reputation. I have a spare pair of wheels specifically for this.
I couldn't launch well today but I only had 3 runs before I had to go. Did manage to get my best trap speed at 107.5.
Oh well, Wednesday night is only 2 days away.

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Old 09-07-2016, 08:50 AM   #129
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Do it! You will thank me later.
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Old 09-07-2016, 06:57 PM   #130
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I'm working on it.
Doesn't look like I will break any records today.


Maybe if I am consistent I can stay late enough for it to cool off.
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Old 09-07-2016, 11:22 PM   #131
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13.006 again but my best 60' time yet.


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Old 09-08-2016, 12:04 AM   #132
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That is an impressive 60' with regular daily tires.
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Old 09-08-2016, 12:59 AM   #133
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Thanks! The credit goes to 18psi, as it often does.
I lowered my tires to 18psi and launched at 5000 for that one.
There is something else I learned reading between the lines, a hint is, I do better with my spare tire, jack and passenger seat installed. Was taking that **** out a few times, but it screwed my 60' time.
Yep, I run faster times with more wieght. Also interesting to note that it is still 77*F out right now. I don't think I recorded an IAT less than 95*F at the track today.
I know the weight thing will change with slicks.
Thanks again for all the help guys!
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Old 09-08-2016, 08:25 AM   #134
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there's always more boost...
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Old 09-08-2016, 11:24 AM   #135
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hahaha WINNING

That's really interesting about running faster with those parts still in. I'm guessing it helps the car put the power down?

Now I'm regretting taking out the spare/jack when I ran my car lol
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Old 09-22-2016, 01:25 AM   #136
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I know, I know. Get some slicks on there ASAP.
Still had a fun night, best $25 I ever spent, I only ran low 13's at 106 & 107. The lower ducting had to be removed because it seemed like it was going blow the hood open over 100mph.




I got to see this Ferrari run against a diesel truck. Ran a 10.8, about on par with a GtR


I am saving for the slicks and I found someone who will mount and balance them for me.
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Old 09-23-2016, 10:41 AM   #137
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whats your launch technique? do you drop the clutch or slip it a little? im going to the drag strip next friday and have no clue how to launch. im on brand new 225/45/15 RS3s...
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Old 09-23-2016, 10:56 AM   #138
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Don't waste your money on balancing drag slick and wheel combo.
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Old 09-23-2016, 12:09 PM   #139
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Interesting, no need to balance them huh?

My launch depends on what happens as I take off, but I do try to engage and not dump the clutch. If I feel it start to bog, I slip a bit more, those are usually my fastest 60' times. I also find for my tire/pressure combo, 4500-5000 is the correct rpm range, too fast and I spin too slow and I bog.
It is definitely different for different tires and pressures, and some of the decision process occurs when the light turns green. Also the track is just different each time, depending on many things, such as who just ran in front of you.
Good luck, and please your time slips. It would be nice to see some more active threads in this section.
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Old 09-23-2016, 02:09 PM   #140
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Quote:
Originally Posted by sonofthehill View Post
Interesting, no need to balance them huh?
Yep, the tires may actually travel around the rim slightly over a period of time, depending on your tire pressure and power; and balancing will offer no performance benefit whatsoever.
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