Improved Fuel Mileage. The 4.1 is here
 

All kinds of claims have been made regarding this topic (Fuel economy). These are the facts regarding my claims. At a steady 70 mph with this gearing you will be turning 7% less rpms and therefore your highway fuel consumption should recieve a nice improvement (As if you were doing 65). The other advantage to this system applies to our turbocharged brethren. You want to be able to reduce wheel spin on launch and other accelerating from low speeds and this will help accomplish that. Also, having the extra power from turbocharging, this gear will allow for potentially higher top speeds.
The units are built by Rick Engman. He has been the engine man on the most successful Mazda road race/ cicuit team of all time, Downing Atlanta, for 30 years. They have achieved numerous championships and prestigious wins in class, like at LeMans and Daytona.
The price for a plug and play unit is $750 plus your core. What a wonderful Christmas gift.
Paul.

I may offer a 3.9 also if there is a demand for it.
Paul.

We should all feel very privledged that Rick make these.
I meet him at SS8 and is one really cool cat.

I'll just cruise 5 mph slower if i want to save gas and put that 750 in the bank lol :)

I thought the RX-8 with an automatic transmission came with a 4.10 gear.

What's the diff? (pun intended)

All RX-8s come with 4.44 ratios as far as I know.

on a turbocharged 8, what will this do to 1/4 mile times and 0 to 60?

Paul I'm interest in 3.9 let me know where i can buy it .

thanks :)

That's a good question, and a little difficult to answer. The general rule is that lower gearing equals quicker acceleration, however, there are many more factors to consider including traction and amount of shifts necessary etc. It will be interesting to see how how this gearing may affect turbo cars at their different levels of power.
Paul.

I could probably have it to you by Christmas.
Paul.

I think this is a cool product, yes....I'm WAYYYYY LATE on this.

Anyway, so what you are saying is lower gearing means quicker speed and better fuel economy?

I thought it was the other way around.....???

Misnomer...
 

Bit misleading, the term "lower gearing" usually means HIGHER numerical ratios...

So your stock 4.44 rear gives lots of turns of the engine per mile, but lousy economy. At 4.1, this ratio would give lower revs for economy, with slightly slower acceleration, unless you have more power (FI) to back it up.

With the stock rear I run out of revs in fifth and redline, but in sixth the engine just can't gain and I lose speed - this ratio might make sixth really useful again!


S

Let's crunch some numbers here. Let's assume it costs $450 to install the diff. It makes the numbers easier. $1200 @ $3/gallon and 20 gallons/mile can buy 8000 miles of fuel. We're assuming all miles are at highway cruising speeds--again a simplification so this means it's a best-case scenario. If a 7% gear reduction equates to a 7% savings in fuel, how long would it take to "save" 8000 miles? Answer: once you installed this diff you'd have to drive 114,000 miles in order to break even. During that time you'd suffer slower acceleration and less torque.

Buying this mod to save money does not compute.
________
Lovely Wendie99

thank you

yes,
but doing a mod,

priceless!!!!!! :)

i think this will be gold as the turbo and sc come on line...

beers :beer:

I've sold one of these to a guy in Puerto Rico who's running a 3 rotor and he seems quite pleased. He really wanted to mildly reduce his highway cruising rpms but the side benefit is: If you have enough horses you may be able to leave the line with less wheel spin with the taller gear. According to an engine's range of efficiency it can also improve fuel mileage. As far as the mathematical calculation of retrieving one's expenditure, I guess it depends on whether you can put in your own diff. Our's comes in the case so it's just plug and play. As gas prices continue to rise and people consider forced induction this could become more and more of an option for people to consider.

Paul.

Just bumping for a FANTASTIC seller!
Sounds like you have a great product here.
PS You have a PM :P

Sweet item! And definately something every turbo 8 owner should have.

If i want to save on gas money, i would buy a Yaris not destroy my car by putting one junky product!

So should this be considered a must have if you are thinking about, say....Petit SC stage2?

Rick Engman hasn't produced a junky product in his life n00b, not that you'd even have a clue who Rick Engman is.

Anybody know about the Super Charger? If the mods really really require differential changes, that is a serious consideration monetarily. I really don't know that much about this for sure, please enlighten me with knowledge.

The supercharger won't necessitate a gearing change but one may compliment the other.

damn.... pwnd

This is exacly what I am probably looking for... well that or swapping in an FD tranny once the turbo gets installed... thanks for providing the diff! At least we have options now.