363 gears MPG?
 

I want better gas mileage. Some on here have had 363 gears. But the motors seem to have been built to the hilt.
Does anyone have 363 gears in a car with a stock motor, or stock motor turboed?

And what gas mileage do you get?

I know a guy that has a couple of Miatas. He was driving 50 miles each way to work. For his DD Miata he put a 3.63 rear end in a 1.6 Miata with a 6 speed and a hard top and was getting close to 40 mpg on the interstate. IIRC, it was about 38. It was a pooch but the 6 speed helped get it going a bit.

Before anyone says that he wasted the gears and 6 speed, the DD is just a place holder and better than the parts sitting in the garage. Basically mobile storage for his autox car spare parts.

Great idea. Spend $400 for a new ring and pinion and $200 in labor to save a few pennies a gallon. It'll pay for titself in 40,000 miles!

YOU ARE THE MAN AGAIN!!!!!
I have boost to make up for the lugging.

I have seriously been thinking of going TDI. Just to get the 55 mpg some people are getting with a upgraded turbo and custom tune.

But if I can ge 40 with a miata.....Why switch from perfection....

I drive more than 2 miles a day, so Ill get my 600 back quick. I take my car on 9 hr trips. An extra 10mpg is A LOT!

How far are the gears shifts apart for the 5 speed?

Is there anyway I might ccould email that guy?

Dude, your woman would be mad if I didn't have enough gas to come see her.

For real though. I'm driving to Austin a lot. And my car has a fresh Jdm, and mild race prepped. I hate to sell it for a TDI. That would be enough to float me if oil prices soared.

And it is paid for......

10mpg extra yah right. BTW I have a 363 with 6 speed. Sorry I can't give you data though because that combo came along with 300+ horsepower and miscellaneous long idles where I have to futz with stuff.

As for the TDI do a ROI analysis. MPG takes a while to make a real impact on your wallet.

Come on man tune your AFRs for lean cruise. And I suppose advance your cruise timing a lot too.

Why get rid of the miata for a TDI? I have of JSW TDI and an MX5. Double Happiness.

Fine you win. I will sell you my cryotreated and polished 3.6 rear with torsen for $800.

my dad hyper miled our 96 to 50 mpg confirmed on several fill ups but that takes abit more of a concius effort than just getting in and driving your car.

You paid for a cryo treated rear end which will never pay for itself. :loser:

I mean of all the people to question someone's bang for the buck purchase!

This.

Sold to me!

I'm getting 27mpg in the track car with the 400lb trailer driving 80-90mph to and from the track. I almost made this thread yesterday considering I have a 6/3.63 in the garage as "spares" for the turbo car.

You can compare the ratios with the FM calculator, but I'll tell you that 1-5 will be tighter than a 5/4.30, then 6th gear on top is big.

You don't need a spare, sell a set.

The rear was ACTUALLY supposed to have my clutch diff put into it but someone fucked it up and put the torsen in there. The whole point of the damn cryo treat was to launch it without splosions. I am thinking about starting the diff build over :( The torsen does work but again, I hesitate to launch it.


OK pm me

PM sent

Anybody here with 3.6 and 5-speed?

The gears are too big, you'll cruise in 4th on the freeway. Check the FM gearing calculator.

These are my ratio's (fc t2 tranny)

3.483
2.015
1.391
1
0.762

Don't you think I need something wider for 340whp?
Currently I am running a 4.1 fgr

That's be me.

Built '97 block, '99 head w/ 1-mm oversized valves and essentially a BEGI S5(+) setup.

Saw an avg of 20mpg while "playing", 25 when obeying most traffic laws and conventions and never measured on a long enough trip to get highway numbers.

These figures may change soon. Corky and I are in the midst of the next round of "upgrades"...

- L

How is the performance? Does it feel slower than the 4.1 or it eats distances like crazy? How much power do you have?

Details details!!!!! Please? :)

I'll cut you some slack because your people know how to make yogurt.

http://www.flyinmiata.com/tech/gearing.php

True about the yogurt. We make great feta cheese also.

About the site.. been there done that, doesn't help much. I need feedback from someone who actually drives this thing.

I start building boost at about 1600 and see full pressure from 3k to redline. No, it doesn't feel slower.

The car generates about 200/200 at 7psi and 250/240 at 12psi. Runs like a scalded cat.

- Adjustable timing gears to drop a few degrees from the intake cam, and add a couple from the exhaust.
- COPs courtesy Savington.
- 255 Walbro.
- Corky's new cast intake manifold.
- Thermostat'd oil cooler.
- Under tray/ducting.
- Some minor maintenance bits; ie: adjusting valves, belts, etc.
- Retune at the dyno.

As soon as we have some numbers, they'll be posted. However, the aim is to significantly increase power at the same boost levels, with the aim of breaking the 150mph barrier *with the top down* on street tires (non-R comp) at the Texas Mile this October.

(Then I'll put a hardtop on it and see what 160+ looks like...)

- L

If you want to retain a 5 speed, and you think the 4.10 is too short, you could do a 5 speed/3.9 rear and have a decent set up. My 6 speed/3.63 isnt in due to procrastination/lack of time.

I and others have said it before. the 3.63 and 6-speed combo is fantastic. The ratios in 1-5 are not exactly the same as a 4.30 with a 5 speed, but it is close enough such that it behaves like a normal 5-speed with an additional 'overdrive' gear.

Now that being said, when I did the 3.63 6-speed swap in my turbo car (versus 4.30 5-speed) I did not see a big jump in mileage like I had hoped. I do mostly highway driving at 70-80 mph, with some stop-and go. I checked/logged mileage every time I filled up. I also checked the odometer to be sure it was accurate.

I was also tuning for lean cruise. But, I was conservative with my fuel tuning, adding fuel (richness) at anything above 100 kPa, which is easy to exceed on the highway with just light passing, which I do a lot of. My fuel curve sloped upward quickly at anything above 80-100 kPa. So I did not spend a lot of time in the lean cruise mode.

YMMV, literally.

DVCN is tuning for lean cruise with E85 and is getting good initial results. His commute is very, very similar to mine. IIRC he covers this in his recent E85 thread.

Even though it was my intent going in, I was so happy with the improved highway drive-ability that I did not care so much about getting the big mileage return-on-investment (ROI) on the taller gear set.

What kind of prices are you guys paying to get these installed? I bought a set of 3.63's and need to get 'em in.

C

$400. I will sell my whole thing for $1200

i need a torsen with 3.63s already installed. I'm lazy