11.48 at 122 from the fast son of a..........hill
#41
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A better pic of the small and large turbo comparison.
Small turbo(blue) made 218 ft/lbs at 3400 and 230 HP at 6200.
Larger turbo(red) made 212 ft/lbs at 4300 and 238 HP at 6200.
I suspect that I was a couple kpa higher with the larger turbo but I need to check my log to be sure.
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Small turbo(blue) made 218 ft/lbs at 3400 and 230 HP at 6200.
Larger turbo(red) made 212 ft/lbs at 4300 and 238 HP at 6200.
I suspect that I was a couple kpa higher with the larger turbo but I need to check my log to be sure.
![](https://www.miataturbo.net/attachments/dynos-timesheets-21/171830-11-48-122-fast-son-hill-80-img_20160517_110617683_hdr_1826f475abb976d7827bd4f8cdddb13390760a21.jpg?dateline=1463508771)
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I don't think their wideband works too well at higher afr's as I was hitting my target fairly well. I must admit I don't tune for 11.8 right at 100kpa, closer to 12.8 tapering to 11.8 as I approach 140 kpa or so, trying to have decent mileage.
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I am curious how the larger turbo would do if you cranked up the boost to closer to 20psi. Not suggesting you do it on a stock motor, but that could possibly be where it hits its efficiency point and start making better power.
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I will say this, I had it tapering up to about 16.5 psi or so at the drag. I got a terrible time and thought I broke something in my driveline, turned out I was spinning my tires in 2nd and 3rd.
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It was about 10 degrees warmer this morning but I had a few extra kpa too. Basically they perform the same above 4300 rpm in the 15 psi range but the smaller one reaches 15 psi much sooner.
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At one point the dyno operator looked at the odometer and asked if there was really 237,000 miles on my car. I said, "yeah, and this is the original motor!" The look on his face was priceless.
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Yeah buddy ![](https://www.miataturbo.net/images/smilies/smile.gif)
102, 103, 104... It was pretty hot today, on crap CA 91 gas as usual.
13 second Miatas definitely get noticed around here, they gave me a hard time about running under 13.5 last time but said if I bolted my hardtop back on it would be considered a hardtop, not a convertible. I just mellowed my launch a bit for now.
The last time slip was against one of the 2015 mustang gt's, but I think it was on all season tires like me. It didn't seem to be set up nearly as well as Vlad's car. I actually almost beat him and was quicker to 330', it was a great race, neck and neck the whole time.
![](https://www.miataturbo.net/images/smilies/smile.gif)
102, 103, 104... It was pretty hot today, on crap CA 91 gas as usual.
13 second Miatas definitely get noticed around here, they gave me a hard time about running under 13.5 last time but said if I bolted my hardtop back on it would be considered a hardtop, not a convertible. I just mellowed my launch a bit for now.
The last time slip was against one of the 2015 mustang gt's, but I think it was on all season tires like me. It didn't seem to be set up nearly as well as Vlad's car. I actually almost beat him and was quicker to 330', it was a great race, neck and neck the whole time.
![](https://www.miataturbo.net/attachments/dynos-timesheets-21/171920-11-48-122-fast-son-hill-80-img_20160518_200858661_hdr_da3964812e23350fac998d204f07fc2bef013a5f.jpg?dateline=1463629012)
#54
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Thanks man! Couldn't have done it this reliably without everyone's input.
I think most of the improvement is from shifting at the right point.
Also helps when you have a badass mustang next to you that you somehow managed to get ahead of in the first couple hundred feet.
I think most of the improvement is from shifting at the right point.
Also helps when you have a badass mustang next to you that you somehow managed to get ahead of in the first couple hundred feet.
![](https://www.miataturbo.net/images/smilies/skid.gif)