mdw1000

Well, something wasn't machined true. For the details feel free to ask Paul at Mazmart. I know he said one of the major consequences would have been quite a bit of noise. So far this diff is very quiet, quieter than the stock one.

mdw1000

Why? To make it accelerate a fair amount faster and rev faster.

Some of us need automatics for one reason or another...

mdw1000

Just an update. I've had a chance to drive it a couple times on a few of our big tollways now, and responsiveness is definitely improved.

magikone69

im loking into doing this mod, anyone have a detailed description on what pre-requirements i need for this. i have an 04 6speed with about 68k on the odo. how much approx am i looking at for an instalation, and aprox how much down time am i looking at. for someone who plans on staying NA and just wants better acceleration and quicker response would this be a good route to go...can i keep the rest of the oem parts (LSD, and other housing parts?)

how well does this work with a lightened flywheel (act prolite?)

staticlag

You need roughly $200 of bearings and seals

mdw1000

Well, I got the FEED gear from JonDemand. That was 675 I think with shipping. But that was back in January. Mazmart charged me 450 for the differential build (including some machining they had to do on the FEED gear to get it to work properly), plus a 500 core deposit. I got the 500 back when I sent in my old diff. I paid a mechanic about 450 to install the diff, but he's the cousin of a good friend so I probably got a good deal on that. It was about 50 bucks for Paul at Mazmart to ship me the diff, and about 50 for me to ship the old diff back.

So total cost to me was about 1700. It doesn't give you huge gains, so it is hard to say if it is worth it or not, but I'm glad I have it. It makes the car more fun to me, lets me get into the upper revs more quickly. But you aren't going to get huge gains from this, so if you are on a tight budget and are saving for FI or something you might want to pass it up.

I definitely highly recommend Mazmart. Paul was great about keeping me up to date, and the quality is top notch. This diff feels much smoother than the factory diff. Of course, considering who built it (Rick Engman) I'm not suprised. I'm proud to say part of my car was built by such a talented and prestigious guy.

Sam at JonDemand was also great to deal with, but he moved on to another vendor. He's still on the forum, so you can look him up.

There is another vendor I saw that sells the FEED gear, I believe it is Mazdaparts.com

mdw1000

I should also say that I have the AT. I'm assuming you'd notice similar things with the MT, but your first gear is already pretty low. The final ratio is still lower than the final ratio I have in my first gear, even with the 4.77 rear gear.

magikone69

thanx guys u answered all of my questions and added great info to this already great thread on the feed. id love to go FI but for warranty purposes is the reason i am deciding not to, un less i can get a pro rated refund from my aftermarket warranty company i really dont want to loose the money as since my 3 year 36k warranty cost a little over 1200 bux!!!!!!!! my car runs great but knowing my luck as soon as i void the waranty is when somethin will go wrong lol.

the feed on paper seems like a great mod for me as the one thing i love most is the rev happy engine, so im guessing with a lightweight flywheel (which is on the way) and my light weight pullies in addition to the FEED drive installed, id have a nice accelerating car which can go from 1k to 7k in a blink of an eye. but at 1500-17000 bux that is quite steep. i will have to think long and hard on this. i found a local seller who is selling at a reasonable price and seems like a rare find.

dipatrx8

I want to ask! when oi am going to install the 4.777 i am gonna spend much more gas on a trip on a high way road while travering with 100mph?
is the accelaration much better? is it ok to install the part?

staticlag

https://www.rx8club.com/series-i-aftermarket-performance-modifications-23/feed-4-77-review-6mt-126949/

My gas mileage went down 2mpg

staticlag

17 city and about 22 hwy

dipatrx8

so with 4.777 your car has economy on gas? you save more gas? or you spent more gas? went down 2mpg what do you mean please?

staticlag

I was 19 miles/gallon in the city, and now I'm at 17
I was at 24 mpg highway, now I'm at 22.

Chamberlin

iTrader: (1)

Dude, if you don't know the basics on installing the different rear-end ratio and what its benefits/drawbacks are, why have you even bought one?

If you are going to be cruising alot at 100 MPH (!!!!) a shorter gear ratio is not for you. Drag racing alot? then maybe.

dipatrx8

I didnt bought the part and maybe i would not because i am driving fast on open roads and i thing i would choose my 2 nd choice ms ignition solution! thnk you very much.

Chamberlin

iTrader: (1)

I think you made a good choice.

dipatrx8

I think it again and i need more acceleration on my car so i want to know if the promblems with feed were fixed. There is any other company making a 4.777 for rx8?
what about knightsport? its a better item tha the feed one?

mdw1000

No one else reported any issues with their FEED gear besides me that I know of. Mr. Engman was able to fix it with some machining. I believe he said it would have worked the way it was, but it would have been noisy for a street car. Now my diff is smoother than it was stock.

So since no one else reported issues, it may have just been my particular gear.

I do know that for 09 Mazda is going to the 4.77 gear standard. Wonder if they are sourcing it from FEED?

dipatrx8

you are the only one guy with a 4.777 ? someone with a 6 gear rx8? any opinion?

mdw1000

I believe staticlag is a 6MT.

kersh4w

iTrader: (3)

he does

dipatrx8

hello you own a 6 gear rx8 with 4.777 ? the part you installed on youe car was a feed part? there is any promblem on the instalation of thiw part? i am thinking to do the same modification. I would like to know your opinion about the accelaration and the max speed
thank you very much!!!

dipatrx8

while installing the 4.777 does the car drifting much better? with the second gear you can dreft easier than the stock one? on the corners?

takahashi

You can get the car lose traction in any power dude. It is the tyre losing grip to start the drift and on the limit of tyre grip while drifting.

I don't think a final drive is in the equation of drifting.

bse50

I have that final gear, it is not much about drifting (i love tracking my car, not drifting it) but it is definitely easier to keep it in the range you want since you have a shorter final gear. You will have the same power yet you will deliver in an easier way to the ground.
Like putting a differnt gear on a bike, same legs but you can spin your wheel at a different speed =p