SCCA ST165 finally begins

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Re: SCCA ST165 finally begins

Postby eric thompson » Fri Nov 10, 2017 5:04 pm

Was back on the Dyno Wednesday since it only had about an hour of Dyno time before Indy, I wanted to see what the new motor spec could put down...
11:1 Compression, 290/274 cams, Billet Supra CT26A but stock wheel size of 46mm, P&P cyl head and port matching much improved over first build...
STU 35mm restrictor - 275whp/330wtq
T1 46mm restrictor - 399whp/340wtq

Not too shabby for basically stock CT26, shit log Gen1 manifold, and nothing too special built 2.0 motor... ImageImage

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ST165-PARTS-RED
ST165-SCCA STU ROADRACING-(RALLISPEC'S ST165)
NEED ONE MORE FOR STREET:)
https://www.youtube.com/watch?v=w-RCuV_Hmqk (ITS miata 6spd,4.78 rear, shitloads of fun!! multiple wins and track records in 2014)
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Re: SCCA ST165 finally begins

Postby GT4_DRED » Mon Feb 05, 2018 8:32 pm

Really liking the torque curve with the restrictor. Are you running the Quaife unit(s) yet?
'00 SC300 - "Big Butt"
'88 ST165 - "Rahtid"
'88 ST165 - "Supah Cyat"
'88 ST165 - "Cornbeef"
'88 ST165 - "Redhead"
'91 MR2-T SMG
'92 MR2-T Nautical Blue
'93 Corrado SLC - "Purple Haze"
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Re: SCCA ST165 finally begins

Postby eric thompson » Mon Feb 05, 2018 8:37 pm

GT4_DRED wrote:Really liking the torque curve with the restrictor. Are you running the Quaife unit(s) yet?
Not yet. The KAAZ has held up well. The real mental block I'm having with running the Quaife is retaining the factory VC... The only solution I can come up with is to lock the VC somehow to full-time 50/50 split and let the front and rear diffs do their jobs.
I'm open to suggestions and/or solutions

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ST165-PARTS-RED
ST165-SCCA STU ROADRACING-(RALLISPEC'S ST165)
NEED ONE MORE FOR STREET:)
https://www.youtube.com/watch?v=w-RCuV_Hmqk (ITS miata 6spd,4.78 rear, shitloads of fun!! multiple wins and track records in 2014)
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Re: SCCA ST165 finally begins

Postby GT4_DRED » Tue Feb 06, 2018 5:49 pm

eric thompson wrote:
GT4_DRED wrote:Really liking the torque curve with the restrictor. Are you running the Quaife unit(s) yet?
Not yet. The KAAZ has held up well. The real mental block I'm having with running the Quaife is retaining the factory VC... The only solution I can come up with is to lock the VC somehow to full-time 50/50 split and let the front and rear diffs do their jobs.
I'm open to suggestions and/or solutions


I just picked up a quaife unit myself and I'm now in the same boat. I'm contemplating either rebuilding the vc to a higher torque rating, locking the vc (jbweld) or doing a spool to remove the vc altogether. No real-world experience at this point, but jbwelding the vc has been done before, but I don't think those cars ran on a road course. I'm also looking to swap out the rear torsen diff to something more reliable, so looking at my options at this point. On that note, I'm not sure which of the three (1, 1.5, or 2 way) would better help to get the rear to rotate?

As a note, I was looking at this a few months back, as a much cheaper solution to the quaife. Agile Performance
'00 SC300 - "Big Butt"
'88 ST165 - "Rahtid"
'88 ST165 - "Supah Cyat"
'88 ST165 - "Cornbeef"
'88 ST165 - "Redhead"
'91 MR2-T SMG
'92 MR2-T Nautical Blue
'93 Corrado SLC - "Purple Haze"
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Re: SCCA ST165 finally begins

Postby underscore » Mon Jun 25, 2018 6:09 pm

eric thompson wrote:We had also fitted some Highlander rear knuckles as they were also 26 spline axles


Hopefully this isn't a stupid question, but were they a fairly direct fit or was there a bunch of custom work involved?
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Re: SCCA ST165 finally begins

Postby 3SDNA » Mon Jun 25, 2018 11:35 pm

At what boost pressure did you get those two dyno numbers for your different racing classes?
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Re: SCCA ST165 finally begins

Postby eric thompson » Mon Jun 25, 2018 11:51 pm

underscore wrote:
eric thompson wrote:We had also fitted some Highlander rear knuckles as they were also 26 spline axles


Hopefully this isn't a stupid question, but were they a fairly direct fit or was there a bunch of custom work involved?
We never saw it through. It was surprisingly close in fitment initially but would definitely require a bunch of customization to make work...

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ST165-PARTS-RED
ST165-SCCA STU ROADRACING-(RALLISPEC'S ST165)
NEED ONE MORE FOR STREET:)
https://www.youtube.com/watch?v=w-RCuV_Hmqk (ITS miata 6spd,4.78 rear, shitloads of fun!! multiple wins and track records in 2014)
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Re: SCCA ST165 finally begins

Postby eric thompson » Mon Jun 25, 2018 11:53 pm

3SDNA wrote:At what boost pressure did you get those two dyno numbers for your different racing classes?
Both at 20psi on 100 octane. Keep in mind with the 35mm restrictor in STU that 20psi dropped to 12psi by 6500rpm.

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ST165-PARTS-RED
ST165-SCCA STU ROADRACING-(RALLISPEC'S ST165)
NEED ONE MORE FOR STREET:)
https://www.youtube.com/watch?v=w-RCuV_Hmqk (ITS miata 6spd,4.78 rear, shitloads of fun!! multiple wins and track records in 2014)
eric thompson
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Re: SCCA ST165 finally begins

Postby underscore » Mon Jun 25, 2018 11:57 pm

eric thompson wrote:
underscore wrote:
eric thompson wrote:We had also fitted some Highlander rear knuckles as they were also 26 spline axles


Hopefully this isn't a stupid question, but were they a fairly direct fit or was there a bunch of custom work involved?
We never saw it through. It was surprisingly close in fitment initially but would definitely require a bunch of customization to make work...

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Gotcha, thanks!
★ 1991 GTFour RC ~ "Rebel Scum" ★
It's for sale! http://www.alltrac.net/phpBB2/viewtopic.php?f=64&t=52181
Build thread http://www.alltrac.net/phpBB2/viewtopic.php?f=44&t=44216
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Re: SCCA ST165 finally begins

Postby eric thompson » Tue Jun 26, 2018 12:00 am

Current state of build... ImageImageImageImageImage

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ST165-PARTS-RED
ST165-SCCA STU ROADRACING-(RALLISPEC'S ST165)
NEED ONE MORE FOR STREET:)
https://www.youtube.com/watch?v=w-RCuV_Hmqk (ITS miata 6spd,4.78 rear, shitloads of fun!! multiple wins and track records in 2014)
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Re: SCCA ST165 finally begins

Postby CMS-GT4 » Tue Jun 26, 2018 1:37 pm

Got to be one of my favorite 165s.
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Re: SCCA ST165 finally begins

Postby eric thompson » Tue Jun 26, 2018 1:41 pm

CMS-GT4 wrote:Got to be one of my favorite 165s.
Thank you sir! It has definitely not been easy or cheap... Lol

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ST165-PARTS-RED
ST165-SCCA STU ROADRACING-(RALLISPEC'S ST165)
NEED ONE MORE FOR STREET:)
https://www.youtube.com/watch?v=w-RCuV_Hmqk (ITS miata 6spd,4.78 rear, shitloads of fun!! multiple wins and track records in 2014)
eric thompson
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Re: SCCA ST165 finally begins

Postby GT4_DRED » Tue Jun 26, 2018 2:35 pm

eric thompson wrote:Thank you sir! It has definitely not been easy or cheap... Lol


CMS-GT4 wrote:Got to be one of my favorite 165s.

X2.. Really nice to see a 165 setup proper..

Any changes to the steering rack to improve the ratio?
'00 SC300 - "Big Butt"
'88 ST165 - "Rahtid"
'88 ST165 - "Supah Cyat"
'88 ST165 - "Cornbeef"
'88 ST165 - "Redhead"
'91 MR2-T SMG
'92 MR2-T Nautical Blue
'93 Corrado SLC - "Purple Haze"
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Re: SCCA ST165 finally begins

Postby eric thompson » Tue Jun 26, 2018 2:42 pm

GT4_DRED wrote:
eric thompson wrote:Thank you sir! It has definitely not been easy or cheap... Lol


CMS-GT4 wrote:Got to be one of my favorite 165s.

X2.. Really nice to see a 165 setup proper..

Any changes to the steering rack to improve the ratio?
Not really... I would've liked to have tried something but it's really not bad at speed with proper grip... The only time I'm really turning the wheel more than I'd like is in slow corners after the front tires have begun to overheat and understeer.

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ST165-PARTS-RED
ST165-SCCA STU ROADRACING-(RALLISPEC'S ST165)
NEED ONE MORE FOR STREET:)
https://www.youtube.com/watch?v=w-RCuV_Hmqk (ITS miata 6spd,4.78 rear, shitloads of fun!! multiple wins and track records in 2014)
eric thompson
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Location: siny - 10304 / nj 07747

Re: SCCA ST165 finally begins

Postby RallyX-GT4 » Tue Jun 26, 2018 3:17 pm

Wow! Nice work - I’d love to see that in person! Too bad we’re on opposite coasts.
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