1993 Quad4 GTZ: Project WTF

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woody90gtz
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Re: 1993 Quad4 GTZ: Project WTF

Postby woody90gtz » Tue Jul 19, 2016 10:49 pm

It is most noticeable on a manual brake application. Your Vette is boosted, so along with the booster you get less pedal ratio and a bigger bore master. Both of those compensate for knockback better.

On a manual brake application you have comparatively more pedal ratio and a smaller bore master to get some more hydraulic advantage. Both of those add to pedal travel, so knockback is more noticeable.

A c-clip axle in the rear also gives more knock back. Where your irs has sealed hubs. The bearing is what makes the difference though.


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Re: 1993 Quad4 GTZ: Project WTF

Postby DanteGTZ » Sat Jun 16, 2018 5:47 pm

Haven't updated this post in a while, but after reading Geoff's updates, I figured I'd mention a few of the things I've done to my GTZ [semi] recently. I'm currently in the annual mad dash to get the car ready for BerettaFest so most of the stuff has happened within the past few weeks. I'll post more pics here in a bit - if anyone has an alternative to picture hosting (since PhotoBucket went nuts), I'm all ears.

Recent Mods:
- New wheels/Tires - I sold my Whistler wheels a while back. I'll post pictures of the wheels after Bfest
- Koni shocks/struts - After debating this mod for years, I bit the bullet and went ahead and bought 'em. I'd been concerned about the difficulty in modifying the struts to make the inserts work, but it was surprisingly easy (and even kind of fun)
- LED lighting (dash, foot wells and dome) - Makes things feel so much newer inside
- DashTek dash mat
- Covercraft custom windshield sunshade (specifically made for the Beretta)
- Bluetooth add-on for my ancient Alpine H/U
- New Alpine Type-S speakers (5.25 and 6x9)
- Leather shift boot (always hated the rubber accordion!)
- Rebuilt factory CV axles by CVSource - finally going to have the correct CVs with the ABS ring!
- ARP wheel studs on the front to accommodate the 10mm wheel spacers (to get the look I'm going for; new wheels are +48mm offset and are sunk too far in on the front)

Older mods/repairs:
- Neon rear disc conversion
- '93 Lumina Z34 master cylinder (I do not recommend this with the Wilwood/Neon setup)
- Installed Addco rear swaybar
- Energy Suspension bushings for control arms, tie rod ends
- new lower ball joints (difficult to get the stock ones out but well worth the hassle when/if you ever have to change them a 2nd time)

There are a lot more things that I'm forgetting, but it's been a while since I've done some of that stuff. I generally don't do a whole lot to the car during the 10 months before Bfest and then it's a scramble to get everything done in the 8 weeks before Bfest. I still need to have my exhaust replaced as it sounds like total ass right now, but we'll see if that happens before Bfest this year or not.

I was somewhat forced into swapping wheels because my set of Whistlers just had too much offset and with the Neon rear disc setup, the rear wheels were pushed out too far and rubbed the wheel wells on almost every bump when there was any weight/load in the rear. Obviously traveling to and from Bfest we're generally loaded down so this was a major problem which had me screaming in anger every time I went over bumps (as the tires made a lovely sound when they contacted the body). They didn't do any damage to the car, but I couldn't take it anymore. The new wheels are substantially lighter and the +48mm offset gives me 22mm more clearance than the other set did. That additional clearance of ~0.8" is significant with the Neon rear disc setup. I'm excited to get the car on the road and see how it does but I'm waiting on a few final details.

More to come.


1993 Quasar Quad4 GTZ - Project WTF
Previous Berettas: 90 GT, 93 Quasar GTZ, 93 Garnet GTZ, 93 Aqua GT

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Re: 1993 Quad4 GTZ: Project WTF

Postby woody90gtz » Sun Jun 17, 2018 8:31 am

So you had not enough offset and they rubbed the outer lip? Stock offset is 42mm IIRC. So if these new wheels give you 22mm more clearance with or without the spacer? That leaves you at 36mm or 26mm offset for the last set of wheels. I'm not surprised they had issues.

I'll be curious to see how that lumina master works with functional ABS. I bet it's pretty sweet. I stopped in 106' with stock front brakes and the neon rears. You might be sub-100 which is getting into super car level.


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Re: 1993 Quad4 GTZ: Project WTF

Postby DanteGTZ » Sun Jun 17, 2018 11:48 pm

woody90gtz wrote:So you had not enough offset and they rubbed the outer lip? Stock offset is 42mm IIRC. So if these new wheels give you 22mm more clearance with or without the spacer? That leaves you at 36mm or 26mm offset for the last set of wheels. I'm not surprised they had issues.


My Whistlers were +30 but I had to run a 4mm spacer to clear the caliper (hence the effective +26). The current wheels are +48. I'm going to be running a 10mm spacer up front and I'm going to reuse the 4mm spacers in the rear (effective offset +44). I'm optimistic that I won't have any of the same horrendous rubbing issues that I had before. The reason for the running the small spacer is the wheel bore itself. The wheels are 56.1mm, whereas the Beretta is 57.1. If I had more time I'd just have the wheels machined that 1mm but I'm out of time so I need the spacers (at least in the rear, fronts are for looks) to clear the larger Beretta hub. I'll get things corrected eventually if it proves problematic but this should work just fine for now.

I'll be curious to see how that lumina master works with functional ABS. I bet it's pretty sweet. I stopped in 106' with stock front brakes and the neon rears. You might be sub-100 which is getting into super car level.


I'm going to give the Lumina master another shot and run it on the trip to Bfest this year. Because this car gets driven so infrequently I sometimes forget exactly what I did (or didn't) like about certain parts.


1993 Quasar Quad4 GTZ - Project WTF
Previous Berettas: 90 GT, 93 Quasar GTZ, 93 Garnet GTZ, 93 Aqua GT

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Re: 1993 Quad4 GTZ: Project WTF

Postby woody90gtz » Mon Jun 18, 2018 12:59 pm

Yeah, +26 and then another 20mm of tire means your clearance was an 24mm less than stock. Add that with lowering springs and there you go.

I've been thinking of adding ABS. If yours goes well that could be a real upgrade with my sticky tires.


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Re: 1993 Quad4 GTZ: Project WTF

Postby 3X00-Modified » Mon Jun 18, 2018 1:39 pm

You can upload pics directly to this site.... .... ... .. . .. Do you need instructions Brian?

ABS been doing it since 96... But two years ago I was labeled as not cool... should delete it... Now it's hot again...

And Brian, why would you not recommend that master with that caliper setup?




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