ProVolks Official Shop-Car Build Thread. . .

Notches, fastbacks, squarebacks.

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aircooledtechguy
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Re: ProVolks Official Shop-Car Build Thread. . .

Postby aircooledtechguy » Tue Feb 16, 2016 5:43 pm

Are those Bridgestone S02 tires?
Sumitomo HTRZ2. Cheap, fairly sticky for a street tire, quiet and shed water fairly well too (which is a big deal up here in the PNW). About $65 per tire. I got about 20K hard miles including several auto-x's out of the last set. I wish I could say the GY Eagle GTs I have on the Porsche 914 were anywhere near as good as these. I think the GYs are vulcanized Crayon; they started out great and progressed to downright dangerous in about 7-10K miles. Totally un-drivable in the wet and I have a worn-out 1.8L. . .
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Re: ProVolks Official Shop-Car Build Thread. . .

Postby aircooledtechguy » Thu Feb 25, 2016 3:35 pm

With a rear engine car, we have a pendulum effect in corners not unlike a Porsche 911. So it's always trying to kick the back-end out when the weight transfers and/or when getting back on the gas coming out of a corner. My car doesn't go for simple cones, it has an appetite for the larger barrels. This is why I have a bomb-can paint job on this car. If I didn't, I'd be afraid to drive it hard. . .

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Re: ProVolks Official Shop-Car Build Thread. . .

Postby aircooledtechguy » Wed Mar 02, 2016 10:14 pm

Just got word from Mario Velotta from thedubshp.net that I'm scheduled for a dyno session on Friday!! WooHoo!! I finally get more than an in-car tune and I'll get the fuel and spark properly tuned. It's going on an eddy current dyno so we will be able to get it tuned under virtually any load/RPM combination and not just WOT. It's really close now but I need to get the acceleration enrichment dialed in better especially with the muffler off.

Tomorrow, I'm installing a switch and wiring that I'll need to start using what's called "table switching" What this will allow me to do is when I go to the track and pull off the muffler and install the straight pipe, I can flip that switch and the Megasquirt will switch to a completely different VE table (and possibly spark & ARF table, but I can't remember exactly), so with that loss of back pressure, the motor will be perfectly tuned for it. Then when I replace the muffler, I can switch back to a street tune that's optimized for the added back pressure of the muffler.

I'll also be adding launch control switches too to aid in getting off the line better. Even though I don't drag race, this will help getting off the start line at auto-x's. I don't know if I'll get these installed before Friday, but I won't be needing them for the dyno anyway.
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Re: ProVolks Official Shop-Car Build Thread. . .

Postby Steve Arndt » Thu Mar 03, 2016 10:45 am

You could add EMAP and make your table switching automatic. This is used in rally and other racing where exhaust pipes can become smashed or blocked up. It also helps in some algorithms with barometric compensation. MAP, EMAP, and Barometric ambient pressure can all be used. Make it as complicated as possible.
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Re: ProVolks Official Shop-Car Build Thread. . .

Postby aircooledtechguy » Thu Apr 21, 2016 12:23 pm

I doubt that the rear seat will ever go back in. Nobody ever sat back there and you really needed to be either under 5y/o or a double amputee above the knee to fit anyway. . . So I boxed it in.

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I had enough extra carbon fiber from my door panels to make a matching box. I used 1/2" foam core to give it rigidity and still keep it light. I think the whole box weighs around 6#. Compare that to the seats which are somewhere in the 40-50#+ range.

It's actually not finished yet. I plan to cut about 6' from each side and hinge the middle from the rear to access everything underneath. I have it all one piece for now since I won't have that finished before Springmeet on Sunday.
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Re: ProVolks Official Shop-Car Build Thread. . .

Postby aircooledtechguy » Tue May 24, 2016 12:30 am

I spent the past weekend in Medford, OR at a Porsche 914 gathering and had a great time. I didn't bring the 914 since the motor has WAY too many miles on it (around 400K!!) and I just don't trust it to get there and back. So I thought I would crash the party in the Squarsche since it's about as much Porsche as any 914. . . :lol:

We had the Siskiyou Speedway rented for the day and had a great time. It's a great road course that is primarily used for cart racing and auto-x. The Squarsche performed great and surprised most at the track by beating all but the fastest cars. During the single lap runs it outran even a 914-6 with a 3.6L 993 motor! :twisted: 'Course once we got to the 3 lap endouro racing, the guys running slicks were able to get heat in their tires and I ended up in 8th overall. :evil: I NEED some racing tires to compete with the big boys cause these cheap Sumitomos just can't handle a track. Myself and a few of the guys stayed after for a practice session to continue the fun after most had gone back to the hotel. I had one of the funnest sessions with my buddy Rich riding along. Here's the footage.

https://www.youtube.com/watch?v=zTP7jvbsJBs
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Re: ProVolks Official Shop-Car Build Thread. . .

Postby Steve Arndt » Tue May 24, 2016 10:17 am

Fun looking track you really had it sliding around nice.
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Re: ProVolks Official Shop-Car Build Thread. . .

Postby aircooledtechguy » Mon Jun 27, 2016 10:18 am

Josh & I finally got a chance to get the Squarsche out on a true and legendary road course this past Friday. We signed-up for the SCCA Track Night out at Pacific Raceway (it'll always be Seattle International Raceway or SIR to me) and had a great time.

The night was uneventful for us, but was very expensive for a couple folks. A guy in a late model Porsche 911 GT2 skidded off and ruined a set of wheels and tool out his front bumper, left-side radiator and lots under the car. Fixable, but it'll cost him. A guy in an '05 Z-06 Vette right behind me lost it in the first 200 yards (!!) on cold tires and impacted the wall @ around 75-80mph before bouncing across and OVER the other wall and coming to rest in a heap on the drag strip. Paddy-wagon came and he was fine, but the car was a total loss. Anywho. . .

We needed to run this event with our full muffler on which meant we were down a bit on power plus it was running a bit lean @ WOT and you could feel the car hesitating in places, but overall it ran good. I ordered a set of race tires (Hankook Ventus R-S3 V2s), but they didn't come in time for this event, so I ran it on my ragged-out Sumitomos and they worked fine, but I was extra cautious in areas because of them. I was fully expecting brake fade to set-in, but it never did and was very happy about that.

On the last session, I told Josh to hop in and we'll let them tell us that he couldn't ride along,. . . No one did!! So he got to have some fun too!!

https://www.youtube.com/watch?v=CdAGGP_fN4I
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Re: ProVolks Official Shop-Car Build Thread. . .

Postby aircooledtechguy » Thu Jul 28, 2016 10:47 pm

Can't wait!! Hotel reservations are in. The car is running awesome. I've got a final dyno day set to get the race tune dialed to the max. so far, the salt is in great condition. We're going back to World of Speed @ Bonneville September 9th - 13th with the Squarsche to defend our record and raise the bar a lot higher!! My son has to get his driver's license 5 days before we leave. If he does, he'll be racing for the first time co-driving!!

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Re: ProVolks Official Shop-Car Build Thread. . .

Postby Chip Birks » Fri Jul 29, 2016 7:35 am

Can't wait!! Hotel reservations are in. The car is running awesome. I've got a final dyno day set to get the race tune dialed to the max. so far, the salt is in great condition. We're going back to World of Speed @ Bonneville September 9th - 13th with the Squarsche to defend our record and raise the bar a lot higher!! My son has to get his driver's license 5 days before we leave. If he does, he'll be racing for the first time co-driving!!

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I may have to try sneaking out there for an afternoon that week. Haven't been out there since 09. Sounds like it could be a good year.
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Re: ProVolks Official Shop-Car Build Thread. . .

Postby aircooledtechguy » Sat Jul 30, 2016 9:58 pm

Please do if you can swing it. It sounds like it's shaping up to be a really good year.
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Re: ProVolks Official Shop-Car Build Thread. . .

Postby aircooledtechguy » Wed Aug 31, 2016 9:30 am

Got with Mario Velotta of www.thedubshop.net yesterday and converted my car from MAP based enrichment (speed density) to TPS based enrichment (Alpha N). The reason was that with the higher lift and longer duration cam, the motor doesn't make a ton of vacuum @ idle (about 72kpa)which can make MAP based tuning tricky. He also discovered that my map sensor had been malfunctioning and needed to be replaced anyway. This would explain my going lean @ altitude problem I noticed last weekend on a drive up the mountains, so. . . :roll: :wink:

He got it dialed-in and it runs awesome!! Instant throttle response at any RPM now. I'll be going to Bonneville this year with about 70 more HP at the wheels over last year (2014). Now I'm off to get a 4-wheel alignment. After that, I just have to pull the passenger seat out and remove the un-necessary stuff out of the car and we're ready for the trip next Thursday. :twisted: Maybe this year we'll gain entry into the "130 Club"; we'll definitely be a lot faster than 2014!!

Here's the final dyno pull from yesterday. . . :twisted:

https://www.youtube.com/watch?v=bReOErR ... e=youtu.be
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Re: ProVolks Official Shop-Car Build Thread. . .

Postby falcor » Wed Aug 31, 2016 11:29 am

Nice Nate! Will be interesting to see what differnce the tune makes and how you feel about it in the autocross aswell. I've regretted a few times not going with Marios ecu instead of the one I have but now I'm sortof invested and stuck with it.....
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Re: ProVolks Official Shop-Car Build Thread. . .

Postby aircooledtechguy » Wed Aug 31, 2016 3:18 pm

Thanks. I drove it this morning to get the 4 wheel alignment done and it's never driven as well. I thought it was smooth before but this as smooth as anything I've ever driven. The throttle response is immediate where before I could get a very slight delay if I stomped on the throttle (like when racing). Not anymore; when I want more power, it's right there. Super happy with what we did yesterday.

I think anything with ITBs and/or a non stock cam could probably benefit from Alpha N enrichment.
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Re: ProVolks Official Shop-Car Build Thread. . .

Postby ALYKAT III » Tue Oct 25, 2016 5:29 pm

OK, Sept 9 has come and gone. What happened ? How fast ?

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