SCCA ST165 finally begins

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Re: SCCA ST165 finally begins

Postby eric thompson » Sat Dec 31, 2016 1:41 pm

And yes. I've had a few scares... Having the brake pedal go to the floor at 100+ mph will make you very cautious. After both failures at the RunOffs I could literally grab the L/F wheel and shake it back and forth a good 2-3 inches while the car was still on the ground...

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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 » Sat Dec 31, 2016 1:44 pm

Here's the first failure... Notice the rotor deflected so bad it cut through the ball joint! The OEM bearings and hubs can't handle the load of 245 Hoosiers at a constant 10/10th's

received_10207215198082124.jpeg


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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 MWP » Sun Jan 01, 2017 3:37 pm

eric thompson wrote:2010 and up Prius front uprights... Still 5x100 and hub centric but much larger bearing which is bolt on, so track servicing is much simpler... Plus the inner races are actually machined into the hub snout OD, which itself is much beefier and splined straight through, being a 26 count spline matches our axles...


:shock: Nice find!
So youve tried these, or are planning to do so?
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Re: SCCA ST165 finally begins

Postby eric thompson » Sun Jan 01, 2017 3:46 pm

They are on, some modifications needed, and will be tested as soon as possible, weathering permitting... Overall geometry seems to have improved... But the real proof will be on track.

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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 » Sun Jan 01, 2017 3:53 pm

I been watching the build on Instagram. I can't wait to see how this thing does on the track.
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92 st185 (205 swap) | 03 350Z Track (sold) | 13 Pilot | 17 Mazda3
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Re: SCCA ST165 finally begins

Postby eric thompson » Sun Jan 01, 2017 4:35 pm

CMS-GT4 wrote:I been watching the build on Instagram. I can't wait to see how this thing does on the track.

I assume you watched the two RunOffs videos I posted the other day?... But yes, I hope it does much better this coming season! Confidence in my brakes and having them last a whole race should improve my pace in itself let alone some other improvements... HP is still a big concern though!

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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 » Sun Jan 01, 2017 4:36 pm

InShot_20161228_084920.jpg


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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 MWP » Sun Jan 01, 2017 5:00 pm

eric thompson wrote:They are on, some modifications needed, and will be tested as soon as possible, weathering permitting... Overall geometry seems to have improved... But the real proof will be on track.


I'll lap up any information you are willing to give away :)
The main questions i have concern the steering arm length (will effect bumpsteer & ackerman), lower ball join to hub offset (effects drive shaft length), and strut ear width/bolt-spacing (will effect if gt4 strut will bolt up).

Whats the instagram address?
My collection of GT4 documentation: http://gt4.mwp.id.au
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Re: SCCA ST165 finally begins

Postby eric thompson » Mon Jan 02, 2017 1:00 am

All the attachments will have to be custom... We made lower ball joints offset to increase caster since they had to be made anyways... Looking at the Prius and ST185 ball joint bolt patterns though they look very similar... So you might get away with bolting up the Prius BJ to the 185 LCA.

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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 MWP » Mon Jan 02, 2017 2:20 am

So the lower lower ball joint you have in those photos are the original Prius items?
If i were going to do this (i'll strongly consider it), then i would probably make up a custom LCA too. I also want to dial in a little more caster yet, my current 3.75° isnt quite enough.

Having to make a custom strut leg isnt ideal since i did it not that long ago to fit my newish Koni Racing inserts, but if needs be.

Hmm, i recently decided i was going to leave my 185 in its current state for a few months. This, and a quick look through your build photos has me all inspired again :P
My collection of GT4 documentation: http://gt4.mwp.id.au
Daily: Celica GT4 ST185 (~170kw/atw)
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Re: SCCA ST165 finally begins

Postby eric thompson » Mon Jan 02, 2017 10:42 am

received_10210650565929825.jpeg
Custom BJ's moves lower pivot forward about 1 inch. Prius BJ wouldn't bolt to my 165 LCA but from memory the 3 bolt pattern looked very similar to a 185... With the knuckle being aluminum all the attachment points are thicker so the tierod end shaft and BJ shaft are a bit longer than our cars with steel uprights...
received_10210933416320908.jpeg

received_10211018624851068.jpeg


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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 klue » Mon Jan 02, 2017 5:00 pm

Are you worried about the integrity of the spindle under racing conditions? IE how the heat will affect the strength of the spindle
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Re: SCCA ST165 finally begins

Postby eric thompson » Mon Jan 02, 2017 5:07 pm

By spindle I assume you mean the aluminum Prius upright/knuckle?? Honestly I am not overthinking that aspect... A couple hundred degrees shouldn't compromise the integrity of aluminum

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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 CMS-GT4 » Mon Jan 02, 2017 6:15 pm

eric thompson wrote:
CMS-GT4 wrote:I been watching the build on Instagram. I can't wait to see how this thing does on the track.

I assume you watched the two RunOffs videos I posted the other day?... But yes, I hope it does much better this coming season! Confidence in my brakes and having them last a whole race should improve my pace in itself let alone some other improvements... HP is still a big concern though!

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I did not. I had been following Seamus. I need to find your profile on there.
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92 st185 (205 swap) | 03 350Z Track (sold) | 13 Pilot | 17 Mazda3
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Re: SCCA ST165 finally begins

Postby eric thompson » Mon Jan 02, 2017 6:57 pm

No IG profile for me... Too much T n A rotting my brain :)

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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

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