NB1 with GT2860R at 12.5 psi. - Miata Turbo Forum - Boost cars, acquire cats.

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Old 09-14-2014, 12:21 AM   #1
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Default NB1 with GT2860R at 12.5 psi.

Here is the dyno sheet from today.



I plan to hit the nearest 1/4 mile track on Sunday on my skinny little 195's... will post up time slip after.

Keith
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Old 09-14-2014, 12:36 AM   #2
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A little better than that mp45, eh?
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Old 09-14-2014, 09:55 AM   #3
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A little better than that mp45, eh?
Yup! I have more dyno sheets in my build thread, including a comparison between the M45 in stock form and my setup now... more torque from the turbo from just off idle to redline.

https://www.miataturbo.net/build-thr...tenment-80371/

Keith
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Old 09-14-2014, 11:05 AM   #4
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I can't wait to see those time slips. Great dyno!!
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Old 09-14-2014, 06:33 PM   #5
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Drag strip results!

Out of 5 runs I only got one clean pass, and that one was with slow shifting to get a clean run. First run I missed 5th, (passed reverse detent, had to come back and go up). Second pass missed 3rd. Third pass (these were back to back passes) I smoked the **** out of the clutch. Waited an hour for the clutch to cool off and recover a bit, then did my final two runs. Fourth run missed 3rd and 5th, but not as bad. Fifth and final run was clean, but I got a clean run by doing really slow 4th to 5th shift.

60' . . . . . . . . . . . 2.143
330' . . . . . . . . . . 5.8922
1/8th ET . . . . . . . 8.8682
1/8th MPH . . . . . 85.09
1/4 ET . . . . . . . . 13.5783
1/4 MPH . . . . . . 106.86

Keith
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Old 09-14-2014, 07:13 PM   #6
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That's downright fast man! all at 12psi, which is beautiful. My new 2860rs has a 12psi wastegate, so it looks like I'm in for some fun.
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Old 09-14-2014, 10:26 PM   #7
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Quote:
Originally Posted by Fireindc View Post
That's downright fast man! all at 12psi, which is beautiful. My new 2860rs has a 12psi wastegate, so it looks like I'm in for some fun.
You doing a custom setup, or a kit from a vendor?

Keith
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Old 09-15-2014, 10:45 AM   #8
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what do you have for diff/engine mounts?


I found the delrin diff bushing/mount really reduced drivetrain movement (allowing you to hit your gears) and wasn't noticeable as far as NVH is concerned. It also helps prevent wheel hop from the diff/ppf slapping around.
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Old 09-15-2014, 11:31 AM   #9
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Quote:
Originally Posted by Twodoor View Post
You doing a custom setup, or a kit from a vendor?

Keith
BEGI log manifold and BEGI downpipe, gt2860RS, semi built motor.

I've been really busy recently, but all the parts are here.
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Old 09-15-2014, 12:00 PM   #10
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Wow nice numbers! I can manage a 14 flat on my msm stock turbo. Good to know once I upgrade I can see some nice numbers. You must be spinning a lot off the line, I can't believe I have a faster 60ft.

Edit: just noticed you said you were on 195 tires... Yeah get some 225s on there!!!

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NB1 with GT2860R at 12.5 psi.-z6hzq0z.png  
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Old 09-15-2014, 12:10 PM   #11
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I think the 4.3 and notchy 6sp is really hurting your time and trap (obviously you already know this).

So I'm guessing that WTB ad for a diff carrier is for a planned 3.6? haha
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Old 09-15-2014, 06:28 PM   #12
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Quote:
Originally Posted by shlammed View Post
what do you have for diff/engine mounts?


I found the delrin diff bushing/mount really reduced drivetrain movement (allowing you to hit your gears) and wasn't noticeable as far as NVH is concerned. It also helps prevent wheel hop from the diff/ppf slapping around.
I have stiffer engine mounts. Drivetrain movement isn't the problem, in a 5 speed it is easy, toward driver 1 & 2, middle 3 & 4, shove it to the right for 5.
With the 6 speed, shove it to the right and it is easy to go too far into the slot for reverse.

Keith

Last edited by Twodoor; 09-15-2014 at 11:07 PM.
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Old 09-15-2014, 06:30 PM   #13
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Quote:
Originally Posted by Fireindc View Post
BEGI log manifold and BEGI downpipe, gt2860RS, semi built motor.

I've been really busy recently, but all the parts are here.
Sounds like a good setup, have you ported the internal wastegate yet?

Keith
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Old 09-15-2014, 06:33 PM   #14
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Quote:
Originally Posted by Mazduh View Post
Edit: just noticed you said you were on 195 tires... Yeah get some 225s on there!!!
225/45/15 RS3's mounted on 15 x 9 6UL's should be arriving on Wednesday

I followed bad advice on my clutch choice (thanks again Stephanie!), so the wider tires may not improve my times that much, if I launch from a high enough RPM to be in boost I get clutch slip even with the 195's.

Keith
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Old 09-15-2014, 06:37 PM   #15
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Quote:
Originally Posted by 18psi View Post
I think the 4.3 and notchy 6sp is really hurting your time and trap (obviously you already know this).

So I'm guessing that WTB ad for a diff carrier is for a planned 3.6? haha
Yup May just buy somebody's torsen rear end with gears (any ratio) and swap them out.

Trap speed would have been 110+ with a good shift to 5th, you can actually see VSS drop substantially on the data log in the second between leaving 4th and engaging 5th.

Keith
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Old 09-15-2014, 07:28 PM   #16
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Very nice. You running wastegate 12.5 or EBC?

Do you have a dyno printout of the supercharger?
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Old 09-15-2014, 09:22 PM   #17
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Originally Posted by Chiburbian View Post
Very nice. You running wastegate 12.5 or EBC?

Do you have a dyno printout of the supercharger?
I have a 38mm external wastegate, and due to the poor design of the return to the downpipe I have around 3 psi of boost creep. I currently have a 7.3 psi spring in the wastegate with a Halman MBC to bring it up a couple of psi to around an opening pressure of 9.5 psi, and the boost creep takes it slowly the rest of the way up to 12.5 psi.

Here is the supercharger in stock configuration (around 5.5 psi) compared to the turbo at 12.5 psi.



Keith
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Old 09-15-2014, 10:38 PM   #18
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Quote:
Originally Posted by Twodoor View Post
I have stiffer engine mounts. Drivetrain movement isn't the problem, in a 5 speed it is easy, toward driver 1 & 2, middle 3 & 4, shove it to the left for 5.
With the 6 speed, shove it to the left and it is easy to go too far into the slot for reverse.

Keith







How come no graph from when you had that little 45 on the frappe setting?
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Old 09-15-2014, 11:03 PM   #19
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Originally Posted by good2go View Post







How come no graph from when you had that little 45 on the frappe setting?
<sigh> I deserve that one!

You talking about a graph of the M45 at 9 psi? There is a whole thread about it here just a few spaces down from this thread:

https://www.miataturbo.net/dynos-tim...ent-e85-78527/

Keith
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Old 10-30-2014, 06:45 PM   #20
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Whaaaaaat I just ran a 13.6 at 104 last week at the drags on a on much less power
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