SCCAITS

iTrader: (3)

How does that help? Just a more expensive than necessary roller to build from. You still have to take points for 4 pot, LSD.... 5 lug is no point hit, neither is sunroof and no one is going to run T-II wheels. The 4.30 is not a big deal as the better cars will run a custom 5.12 diff - no point hit for final drive ratio, and if there was the 4.30 was not on the base model so you'd be stuck with a 4.10 or taking points.

Roen

iTrader: (2)

No, you're right, I missed that line completely, I think I need to get my eyes checked.

I sent an e-mail to Gary requesting an exemption for the GTUs tranny, but now my argument doesn't hold water since I missed the GSL-SE line.

I guess for now, the tranny to get is any 1986 5-Speed per the OEM rule. Good thing the PT/TT rules are the same, makes it easy to build a TTD/PTD car. I'm hoping to get close to 200 whp with 2650 minimum weight in D-class, that should put me well ahead of the common D class car. I'm going to experiment with the front single piston setup......let's hope I don't die.

One thing that sucks about the porting rule. If I found someone who knows how to streetport very well, and can clear 220 whp with an aftermarket manifold, I have to discuss that with the TT director and ask for a re-class? I said screw it, I'm not bothering with porting then. Heck anything over 180 hp is a reclass on a streetport. I know guys making 190 whp on a stock port, rebalanced engine for crying out loud! The porting rule needs to change.

I've heard a rumor of someone having a 5.35 R&P gear in the NE....must find that gearset.

The post 2 above mine is a fine example of posting when not understanding the context of the thread. That kind of stuff needs to be cut down on. Though, it's nice to see that you're starting off with 8 points if you decide to run a GTUs.

3 for tranny
2 for 4-pot calipers
3 for VLSD

Actually, I just thought of something. Via the update/backdate same or lower class rule for donor cars, can't you use the GSL-SE transmission, anyway? If not, the GSL-SE, then possibly the GSL which was the base of the 84-85 years? We all share the same model name, though the extra letters caveat may apply here. Goddamn confusing rules.

Do you know of any lightweight (~10 lbs) 15 x 8 wheels? Looking to run 225 R6's (And get 1 point back!), and wouldn't mind hearing a few recommendations on wheels.

Molotovman

iTrader: (49)

Calm down buddy. I'm not familiar with how the classing sytem works. I consider my GTUs pretty close to a base model. It's got what it seemed ike you were looking to put ona true base, so if it's classed the same why not get one and save youself the work?

Molotovman

iTrader: (49)

Since when does the GTUs have a .756 5th gear?
On the Dealer page it says it has the same .697 as the other N/A's
Is that wrong?

Roen

iTrader: (2)

yup, if you'll notice, (and I can vouch, since I have a GTUs)

3000 rpm in 5th gear is ~70 mph, due to the combination of the .756 and the 4.3 rear end. If it was just due to the 4.3 rear end, you'd be seeing 80 mph at 3250. Instead, you see it at 3500 mph.

On other NA's, 3000 rpm in 5th gear is 80 mph.

Mazdatrix lists ratios on their website. The GTUs is the only member of the NA 89-92 w/ LSD group. (Officially)

In NASA TT or PT racing, you automatically incur 8 penalty points for using a GTUs. Sucks, doesn't it?

I made of bunch of edits to this and my previous post, so if you'd like, feel free to read through for some answers to other questions you may be having.

Molotovman

iTrader: (49)

Well Thanks for teaching me something new about my GTUs. I always thought it was .697 because thats what the dealer sheet in the FAQ says.

Also sorry if I ruined your buddy's serious racing thread here.

Roen

iTrader: (2)

meh, it happens.

What you should do is look into STS2 Autocross from SCCA, as I think that's where the GTUs is most advantageous.

Molotovman

iTrader: (49)

Thats what I'm up to

I just got my GTUs with a bad engine last month and should have a re-man in it by the end of the month.
Theres a group aroudn here that does an autoX without any classing. You just pay and go. It's fun if you're not super competitive and don't have a lot of money. I'm just getting into this and I don't have a lot of money or knowledge yet. I'll learn a whole bunch this summer I'm sure.
The only mods the car will have are R-comps on whatever lightweight 15x7 or 15x8 wheels I can find for a decent price, Pineapple aux port sleeves, and an exhaust.

SCCAITS

iTrader: (3)

Couple comments...

You mean Greg, I hope

200rwhp in D? Don't think it can even be done in C. As you stated any SP over 180rwhp is a dyno re-class - so, not worth it. I know a guy who did an SP on and FC and at 2550lbs he barely ended up in PTB (re-classed) with 196rwhp, that is with the rest of the car being normal ITS stuff. Greg doesn't like rotary motors, or at least what I gathered in numerous emails with them. He has stated he'd like all rotary motors to be classed by dyno which I strongly disagreed with. Furthermore, he thinks it "easy to cheat" with a rotary motor. 190rwhp on stock port is insane, we both know the best ITS cars make 180rwhp. I won't say what I am at but am very happy with my current rwhp and still have some type of engine management to do rather than an FPR. I'd be curious to see your point breakdown, PM me and I'll send you what I have for points, right at PTC limits.

Greg tried to say dyno classing for wiring the VDI open and removing 5th/6th rods and sleeves. I fought and won, no points for this with a technical bulletin coming. There will be dyno classing if you modify the 5th/6th ports with Pineapple sleeves or whatever, don't go there. Can't even ceramic coat stuff like the intake, it's considered modification and takes points.

I am still on 15x7 wheels and will probably stay there. Want to reduce unsprung weight? AWR 2 piece rotors, no point hit.

Clearly the .756 5th gear for 3 points is not worth it, but are the Miata gears? That's the joy of PT, user has to decide. With only so many mods available to to the engine, suspension, drivetrain, it really boils down to weight. Every 1 pt you can think of as 15lbs more that you could remove.


Molotovman - no offense, it wasn't personal. Just didn't make sense why a GTUs was the car to have for IT or PT racing. Join in these type threads, lots to learn.

Icemark

No the only IT car I did was a RA64 Celica on the track, although I did occasionally run my old 87 sport in auto X back in the early 90's down at San Diego (now Qualcomm) stadium.

the .7111 5th gear in the 86-87 base and 88 vert would probably be close enough... I doubt many would notice the difference between the .711 and the .756

Roen

iTrader: (2)

Lol, as you can see, I really am out of it today. I'll send you my point break out in a bit. I know an ITS car fully legit making 189.2 whp.

Roen

iTrader: (2)

Did any of the base models ever come officially with the aluminum hood, standard?

Wait...........what was the base model for 1992? Was it the convertible?????? Hey.....doesn't that mean 4-pots and alu hood? Or does the year not matter?

I wonder if we have to assess points for the AWR 2-piece rotors, since they require the spindle to be machined for installation.

Rotors are the same between the 4 piston and single piston 5 lug calipers, right?

owen is fat

if they were automatics they may have had an aluminum hood but I doubt it, for cost reasons, the base models were dirt cheap, I dont think they'd slap on an aluminum hood at the factory for the cheap-o model.

some cars with 4-piston front brakes also had VENTED REAR rotors, others had solid rear rotors.

I seriously doubt the vert was the base model for 1992.

Roen

iTrader: (2)

Since the vert was the only model offered in 1992, you could make that leap.

I guess it doesn't matter if some came with aluminum hoods, as long as Mazda officially says that the cars can come with just steel or with either aluminum or steel on the base model. If it's the former, than boo, if it's the latter, than yay! Can anyone verify Mazda's official stance?

Damn, none of the base models ever came with vented rotors, right?

SCCAITS

iTrader: (3)

why's it matter? rotors are 100% free, put on whatever you want, even 2 piece for 0 points.

NjJay

that sucks...i thought the verts came with the lsd...boo

Roen

iTrader: (2)

Calipers are different between the two different rotor types.....stupid non-OE base caliper rule.

SCCAITS

iTrader: (3)

Maybe I'm confused here. Are you saying there are 2 types of rear single piston calipers? One using vented rotors and one using solid rotors? The vented rotor caliper not ever being on the base model? Meaning we have to use solid rotors to meet the rule? Is that where this is going....

Roen

iTrader: (2)

Yup

But, as I interpret it, since you're already using the 4-piston caliper......you've already taken the point hit.

As for me, looks like AWR's in the front and OEM replacements in the rear, running Blues or HT-10's.

SCCAITS

iTrader: (3)

Huh. Missed that one! I was keeping 4 pots anyways.

Roen

iTrader: (2)

Now I just need to find someone to make me a ring gear with 52 teeth, a pinion gear with 9 teeth, and have it fit in the 2nd gen rearend to mate to my 86 transmission.

Roen

iTrader: (2)

SCCAITS, what do you think of the 92 Base model interpretation?

SCCAITS

iTrader: (3)

Brings up a good point. According to the sticky FAQ on this site, 1992 was Vert only, therefore it has to be the base model as that was the only model offered. There are no stats on FAQ about the 1992, more research would need to be done.

On the 1991 vert, 4 pots and ventilated discs were standard. I wouldn't suppose they changed that in 1992. I don't know about the aluminum hood.

From Wikipedia, "Despite production ceasing in October 1991, Mazda built a limited run of 500 convertibles for 1992 as "specials" for the domestic market only."

Quick glance at the CCR did not show any exclusion to this, as it was a domestic market car. The 1992 vert is the RX-7 13b, it was the base model, it was for the domestic market. What it came with should be considered OEM according to the rules, and therfore not subject to point hit.

Gather up your proof of what the 1992 came with and I think you have a good case for no points on brakes and the hood and ?

Roen

iTrader: (2)

SWEET!!!!!!!!!!!!!!!!!!!

4-pots, aluminum hood, and a bunch of other stuff is useable now, guess I'm using the AWR all the way now.

I wonder if anyone has brochures for 1992 Verts.

I think this is a job for Icemark.

Icemark

92 verts were all Turbo in Japan. All came with alum hoods and 4 pot front brakes, and vented rear brakes but didn't come with a LSD. (LSD were optional in Japan).