FC's in NASA PT
 

I'm bringing this thread down from the Second Gen specific section
https://www.rx7club.com/showthread.p...1#post10415265

Post a pic of your car and points you are taking. Maybe we can figure out the ultimate PT FC. So far there are 3 cars, each with a different approach.

Here is mine
http://i969.photobucket.com/albums/a...s/C79C1037.jpg


Here is how we point out and stay in PTD (basically it's keeping the weight)
Current points with car at 2800lb coming off the track with driver

9- Tires- 10 point 225's We lose a point for width
1- cold air intake
1- under drive pulley
2- header
2- exhaust
1- cat conv removal
3- limited slip
3- shocks
2- springs
2- sway bar
3- bushings (spherical and solid metallic)
2- brake calipers
3- splitter
3- facia/air dam

Total is 37. I will use the extra 2 points for weight reduction to be safe

Tinner

http://i157.photobucket.com/albums/t..._ver1-6069.jpg

My base class is PTD as a TII with an engine swap, dyno classed at 185rwhp at 2850lbs.
+8 tires, 255 RA1, base tire in PTD is 245
+3 shocks
+1 inverted shocks, the Stance coilover front struts are inverted
+2 springs
+2 sway bars
+3 air dam

Rock Lobster

https://www.rx7club.com/attachment.p...4&d=1285092234

9 months ago this was a bone stock, automatic, 1989 GTU with an anemic engine (non functional VDI and aux ports).

We completly tore the car down, just about every nut and bolt and built what you see here. I have had very little time to document the build but i hope this winter to take pics and do some writeup.

First thanks to my friends GooRoo, Damian, and benandersonracing.com it makes all of it worth it to race and build with you guys...

Some build highlights:
- Pineapple Stock Port Series 5 Race motor (stage 3 oil mods). Built from almost all new parts, the only used parts were the rotors and the e-shaft. Wired open VDI and aux ports.
- Pineapple rebuilt series 4 transmission with custom trany mount for auto chassis (1986 gears)
- Stance 8k/6k coilovers
- Stock Sway bars
- Full Corksport 2.5" exhaust with headers
- Rtek 2.0
-Fully rewired. The engine harness, front harness and rear harness were completly removed and new circuits were wired and harnessed from scratch. Only the stock emissions harness was used and half the wires were pulled out of it.
- Depowered 15.1:1 rack.
- Removed A/C
- removed Dash and all equipment underneath
- Fuel tank empty with no driver, full stock glass and steel body panels the car weighs in at 2300lbs.
- All emissions removed
- Bone stock fuel system (no issues and no fuel starvation until down to about 3-4 gal in the tank)
- Miata Torsen Rear end with various gear ratios (4.1, 4.3, and 5.12) is what we will run depending on which track we are at.
- Aluminum flywheel and driveshaft
- 6-pot wilwood front brakes with 2-piece rotors and rs/rz rear brake rotors
-Currently we are running 235 Nitto NT-01 tires on 8.5" wide RPF1s.

Subscribed, Nice to see a few more FC's!

Great thread, I've seen the 387 FC in person at mid-ohio, It's a well done swap and super clean!
I hope to be in PT soon.

Subscribed.

ST is where its at. man that counting points stuff gets old real quick if you ask me!

http://farm5.static.flickr.com/4033/...9eee3f04_m.jpg

More details on the ST car? My '87 TII is still "under construction" and we're expecting it to end up in ST1.

With that being said, counting dollars for replacing cracked downel lands gets real old quickly too. You were making 490hp ;) just to compete in TTU. I think the FC chasis looses out to modern suspension technology, and the corvetts' insane tire width allowance.

The PT format helps people race that have a budget.

got the reliability issues worked out now so thats not an issue anymore. yes i do agree the rules dont make up for the technology differences but i do also believe if i were to take the hit for putting larger tires on my car it balance back out better. bigger tires almost always fixes things. they are like the biggest band aid you can throw at an issue lol

I dont thing st costs that much more to race. the only real difference is the tire budget and wearing of expendable parts faster and a LOT more fuel. the chassis build is almost the same just requires a few things to be beefed up to take the forces.

Points:
7 - Tires
6 - Suspension (inverted aftermarket shocks and springs)
3 - LSD
5 - Exhaust
2 - Brakes
16 - Weight Reduction (Race Weight is currently 2570 or greater)

Under Free Mods:
"OEM ECU/PCM reprogramming via reflashing or replacement/aftermarket ROM chips or
simple ROM boards (The OEM ECU/PCM box/housing and hardware must be used)."

Since the Rtek is a simple ROM board that in effect reprograms the stock fuel and timing maps, it is free....

I like that approach, allowing brakes and LSD of the TII at no points. Technically you could run the North American spec TurboII S5 Aero as it was all base stock for 89-91 turbo cars. You could also run either the stock S4 clutch or the S5 viscous LSD.

BTW guys with the new ruleset we can run a depowered 15:1 rack or really any other ratio rack...(we ran it last year illegally, as i had thought removal of power steering was free when i built the car)

It works pretty well, I not only get "free" TII brakes but also an LSD. My original plan was to run the S5 aero but I could not find a front lip anywhere and a new one from MazdaTrix plus the shipping was out of the budget so I rewoked my points to run full weight and add an airdam.

I was under the impression the power steering removal was always free, just a change in steering ratio cost points.

So was I! But, apparently not...it is for us based on backdating rules, but it would have to be one of those 20:1 racks as before this year ratio change was illegal. Since you reclassed your pullys are free anyway...so it does not really apply to you...

BTW finally an interesting thread on here. First one in some time....lol

What side skirts are on that car?

We gotta get SCCAITS to weigh in with his B built (or is it A now?). He has the transmission we all want....

How do you like the Rtek? We really need to dump the stock ECU and have limited budget. Are you getting good results without the fuel pressure regulator?

Sorry guys, went back to SCCA and built the car to try and win National EP races. Many more cars in the class and much more contingency there.

Haven't even looked at the points as I have no plans to run any NASA events this year. Unfortunately PT is dead in TX and racing yourself sucks. Last NASA event was March 2010.

The car has progressed from ITS - ITE - PTD - PTC - PTB - EP. I plan on staying in EP for awhile as our car counts are good and Mazda/Hoosier both pay very well.

My fuel system is bone stock. Pump, regulator everything. I did rewire the pump to see full voltage all the time (nearly 14v all the time, and took the resistor relay system out of the equation). We have a very rough tune in there now we basically just pulled fuel out at the top end to smooth it out and picked up a fair bit of power. I need to do a lot more timing and fuel tuning this spring. I ran stock timing maps last year because i had not had time to get the car to a dyno for half a day.

EDIT: The other thing we changed was the fuel pressure vac switch got removed, thus the stock regulator sees full vacuum all the time now.

I don't blame you, but, NASA nationals is at Mid-O again this year as you may know and the fields should be a whole lot larger. The local PT fields are always a crap shoot though...

Good luck either way...

Have you seen the 3.8l Buick V6 powered FC that will be running PTD. There is a thread on NoRotors.com. The site seems to be down this morning. I'll post a link when it comes back.

Steve

Ummmmm it's the 387 car.

http://www.norotors.com/index.php?topic=4555.0

Ugh. So true. :(

+1!!

I ran my legends car in STR2 these last couple seasons in NASA MW (im the orange one). A half page long core rule set with none of those funny "intent" arguements makes me think the next time my FB comes out it'll have ST on the side lol

Where would you run the 4.3 or 4.1?

With a stockish tire circumference of 78 inches, the 5.12 is good for 152-166 mph in 5th gear @ 8000 rpm (depending on whether you have the .697, 0.711, or 0.758 gear).

Even on long straights (e.g. California Speedway's 0.6 mile front straight), is that speed achievable in a PTD or ITS car?

The 4.3 will get you 137 mph @ 8000 rpm in 4th....

The problem with the math above is that an ITS car would be running a 225/45/15 R6 that is 22.9" in diameter which is about 71.9 inches in circumference. At 8500 RPM and the right 5th gear (.756), your top speed is only 149. The chart is for a 225/45/15 R6 @ 22.9" and 5.12 rear.

There are actually some tracks where a 4.10 using 2nd-4th is faster than a 5.12 using 3rd-5th. It just depends. I did find out quickly that the 4.3 is a fairly useless ratio for road racing.

We use a whole acceleration rate calculator based on the tire circumference and compare with log data etc.

I just built a 4.77 with torsen. We have not had a chance to run it yet

4.88 maybe? Where's a 4.77 come from?

On another note, tough to have a front running ITS car and class well in PT. The ITS setup needs the .756 5th which is +3 in PT for altered gear ratios.

On a PT only car, rather than take +3 for changing the 5th gear, might consider an Emco gearset for the RX-7 box and skip the high dollar 5.12 or 4.88 rear end. You'd have a close ratio transmission and only +3. I saw one for sale a few months back for around $2k in good shape.

Quaife 2 - 2.564 1.670 1.277 1.000 0.794
Quaife 1 - 2.350 1.550 1.240 1.000 0.886

4.77 came out of a Kia Sportage . We picked it up for $200 with a Torsen. I had Rebello lengthen the pinion.

I also agree that a proper ITS car cannot be a competitive PT car. A proper ITS car will end up in PTC. More importantly for us is the ITS car falls into E2. The idea of having a car you can only race with NASA did not make sense. I was not able to find a way to make the car maximized race with both sanctioning bodies. We were mainly interested in enduros so the decision was made to go the ITS route. Not sure a proper ITS car will be faster than a proper "D" car.

Currently we still fall into D so it's not a problem. Once we get a ECU, fuel pressure regulator we will be done in D. I can't remember what else we are short currently from a full build IT car.

Yep, i'm running an 86 5th gear, its of course not ideal, which is why we find a trade off between 4:10 and 5:12. Otherwise with that GTUs 5th it would likely be a no brainer with a 4.88 or 5.12. I'm gonna check out those emco gears.

That should work well, nice find.

Here's the ones I have seen for sale:
http://prodracing.com/prodcar/viewtopic.php?f=4&t=11732
http://prodracing.com/prodcar/viewtopic.php?f=4&t=12004


AWR has it listed as a Quaife gear set: http://store.awrracing.com/products/...tio-Set-1.html

This is our little toy. It runs in GT4 in CASC GT Challange racing and used to run in the Castrol Touring Car Championship. The specs are as follows;

Motor -

- 1/2 bridge S5 4 Port with S5 NA internals
- 4 ITB intake
- Megasquirt ECU
- Racing Beat Race Header
- 3" Exhaust with Borla Muffler

Suspension -

- presently using coilover Bilstein race valved struts and Koni rears. Converting to Morrisdamper 3 way adjustables front and rear
- rates vary between 400 - 700 front and 175 to 400 rears
- Suspension Techniques bars front and rear
- poly bushings and rods ends everywhere possible
- Camber plates on front
- alu rear subframe mounts
- rear camber adjustment rod

Brakes -

- stock brake system with Vortex Brakes VR1 and VR2 pads
- braided lines

Body -

- AWR E Prod nose
- APR rear wing

The car has tons and tons of other structural changes and lightening efforts. The seat has been moved closer to the center of the car and lower down to improve C of G. The car has been raced for over 10 years and this season will be back in the GT Challenge Series and the new CASC Time Attack Series.

Eric

What PT class would you be and what car do you have? Between the 2 FC's, the miata, integra, etc., PTD might be huge! Especially at crossovers!

do the Rtek and its no points! and just skip the FPR, you don't need it

its also legal in IT

this weekend we actually switched from Honda Challenge to PT and TTE (time trials), because the field is bigger in PT in our region.

we took the wing off the HC2 car, and its PTE/TTE. We now own the TTE lap record at Infineon, 1.56.2 i think?

PTE is tough, it lets you build a FAST miata...

I have your classification form here. Were you legal? I didn't make it out this weekend.

What HC were you? Must not be HC2, although it looks like all the HC entries are going to be down this year.

of course we're legal! mario added up all the points! feel free to come over and look at it

the car was an HC2 car in 2009, i think they have changed some rules, so i'm not sure what it fits in HC anymore, and since nobody is running HC this year, we decided to do PTE/TTE instead.

At this point I'm good. Start kicking every bodies butt and I'll be by

And either you have a equally fast twin car or you still have 2 transponders from the 25. You guys got me by a couple of tenths in TT on Sunday. Good to see Mario racing in PT again.

Kurt
PTE/TTE/ITA/ITX #76
Blue first-gen

lmao, yes we have the two transponders, it totally confused timing, but just on sunday

you and your car ran good this weekend, good race!

We are hoping to be at the autobahn and mid-o crossovers this year. Also will be at RA and running enduros if my drivers can cough up enough cash! lol

LOL we did that in an MX-5 cup race. Rented a car that had a VERY hidden transponder so we put a battery powered one in for first practice to make sure. And sure enough we got called to race control. I swear they were stifling laughs. I could just read it on their faces, "Bunch of amateurs."

My BIL took it out for an open track event today at Thunderhill. Stuck it on the dyno. I knew it was down on power... 140hp/124ftlb.

140 hp @ Kevin's dyno at MCE? I'm at 138 hp @ Tom McCarthy's dyno in Fremont (which supposedly agrees with Kevin's to within 1%).

So we should race in PTF. ;)

My BIL had texted me 140. I guess he was a little off. 139.99 :blush:

I would like to lose the the lead out of the car. Currently we have 150# to make 2800. ITS weight is 2680.

SCCA just gave me another 50lb drop off my base weight :nod: Now only at 2250 with a stock gear box, 2363 with the Jerico.

It's a joke that NASA is at 2800. You can't make that without lead and are maxed at 250lbs.

Only reason we have that little is I'm a fatty