Greddy Turbo working on auto RX8
 

Hi Everybody,

Just wanted to let the automatic RX8 owners know that the Greddy kit fits on the car. The e-manage would not work however, so I used my other e-manage that I had been experimenting with. I used the harness that came with the kit. Jumpers 5 and 6 inside the emanage were turned off. I am using just the additional injector map to control the 4 injectors. My initial tuning has the air/fuel ratio in the 11 range. I would like to gradually lean it out to about 11.5. The only problem is that the injectors are running at about 95%+ duty cycle. This is too high, so I am going to replace the secondary injectors with 550 cc ones from RC Engineering.
For a blow off valve, I used one from a 1993 RX7. It is plumbed between the pipe near the throttle body and the air inlet pipe coming from the air filter.
I had done some 0 - 60 mph tests before the turbo install. I averaged 8.8 seconds. After the turbo install, I averaged 6.4 seconds. These times were done by pre-loading the torque convertor by standing on the brake and gas at the same time. I plan to dyno the car after the larger injectors are installed.

Later,

Rick

FYI, apex8 is Rick from Rick's Rotary. They're the guys in Pleasanton who work on RX-7s, recommended by Bern and installed my ACT flywheel. Rick has lots of experience with eManage tuning in general. The turbo'd auto is his personal car so you can be sure he's doing a meticulous job. This is Rick's first post although he's been lurking for a while.
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Coach purses

cool. it would have been nice to hear that from him though.

There is a light at the end of the tunnel. Thanks Rick.
Also could you take a pic of the BOV near the TB?

Rick congratulations man - thatsgreat news for all of us auto owners. A 6.4 0-60 ispretty decent considering what our automatics run stock (mines around 8.1) - so atleast now you have some respectable straight line performance. I wonder how powerful it feels in the mid range. Also let us knowhow the tranny holds up

Clearly if/when I go this route itwill be w/SSRs kit.

Hmmm--very interesting, 6.4 consistent seconds to 60 is what the auto RX8 should have been doing in the first place--but this is the route I may go once my warranty is up. Keep us posted--and good work.

I new the auto would be fine. How does it shift? Any slippage at all?

Apex8, maybe you can give us a run down on any and all mods you have on your RX8. Alot of us would be interested what youv'e put together, like intake and exhaust to go with the turbo. Thanks!

I don't know at what point it becomes "illegal" advertising, so I thought I'd put a plug in for him. Just from his post alone you wouldn't know he's a professional mechanic with years of experience working on rotaries--although the information content is a definite clue. ;)
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WEED VAPORIZERS

Wait actuallyI have a question for whoever can answer this. How is it that Ricks automatic Rx8 improved over 2 seconds in its 0-60 time (went from an 8.8 to 6.4) w/the GReddy turbo kit while philodoxs manual Rx8 made a much less impressive improvement (went from 5.9 seconds to somewhere around 5.0 - 5.2 seconds)?

Why would the smaller engine make a larger gain than the bigger one w/the same exact kit?

Adding horsepower to a lower powered car will make more of adifference then adding horsepower to a higher power car. Example: adding 30hp to a 200hp engine will make a bigger difference in 1/4mile times compared to adding 30hp to a 500hp engine. Well, I think that is why there is a difference. I could be completely wrong. :o

Well--we would need to compare the powerbands of the two cars--but in essence I believe that the auto has more consistent performance than the manual--remember the 5.9s in the 6spd is hard to repeat consistantly. Also I think that some folks commented that due to the 4-port config they respond better to boosting--perhaps someone else can offer a more technical response.

Two points to consider:
1. The stock auto has slightly more torque than the manual.
2. Diminishing returns means the next incremental increase takes more effort.
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LAMBORGHINI V8 SPECIFICATIONS

I guess itreally doesnt matter in a sense b/c even though he is technically making larger gains than the manual Rx8s are w/the same exact kit - its still not performing quite as fast as the stock manual Rx8. Wouldnt it be more beneficial to have a kit specifically designed for the automatics 4port configuration rather than using a hand me down from the manual or is that irrelevant?

Which components would be different for an automatic vs. manual? Except for the larger fuel injectors kit components would be the same.
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CHRYSLER SEBRING (COUPE)

air flow wise the 4 port and 6 port engines are pretty similar up to about 7000 rpm i'd be willing to bet. When the tertiary ports open on the 6 port, that's where you'd see a difference. Therefore you should be able to get away with using the same setup.

I'd really like to see a stock dyno on a 4 port. I don't think they suffer as much from the factory tune as the 6 ports. The 6 ports are losing 20hp to that (based on a few peoples statments in other threads, don't want to get this thread hijacked with another hp discussion), I wonder if the 4 port loses anything at all. I doubt they had to cut back on power like on the 6 port for cat longevity (since they use the same cat). But what do I know :D .

Being part of the minority on this forum sure does sucks (this thread is barely getting any attention).

Anyway Im pretty sure our automatics fall somewhere in the 130 - 150 whp range.

Still not sure if buying a turbo kit for our automatics is viable though b/c if Gordons rumor ends up being true and Mazda is upgrading the automatic Rx8s to the high power engine for the 2006 model year - then youll probably have stock 2006 automatic Rx8s doing 60 in low 6s that you can trade for + warranty + everythings brandnew.

Regardless I hope Rick manages to squeeze some more power out of GReddys kit. What hes already accomplished is amazing (a 2 second improvement for less than 5grand?) but itd really be great if he could get his automatic Rx8 to match the performance of the stock manual Rx8s w/this kit. Hes almost there anyway.

This is true--I probably would trade mine in on the hi-power RX8 if this is true as well--especially if the SMG comes to fruition.

JeRKy 8 Owner Being part of the minority on this forum sure does sucks (this thread is barely getting any attention).


I've been following this thread since the onset and am sure that there are many others. I don't want to sound as stupid as I am about what your doing so I try and stay in the shadows. All I know is I want to go faster. PLEASE KEEP THE COURSE. I will send a little encouragement from time to time

:P cant wait to get more power out of my AT RX8 :D

Any new developments on this end?

The European 192 hp version has got a 5-spd manual box.
Mazda claims 7,2 sec for 0-62 mph(0-100 km/h).The only test I've seen is 7,7.
The LP hits the rpm-restrictor in 2nd gear at 104 km/h.(64,6mph)
The 5-spd man is therefore obviously faster than the 197 hp 4AT..

The Euro 231 hp 6-spd got a claimed 6,4,but best I've seen is 6,9...

Its been nearly 2 weeks since Rick (apex8) last posted anythingabout his turbo charged automatic Rx8. PUR NRG couldyou call him andask him to post an update for us?

Three weeks andstill nothing. Must have fuckedup his car or something..

lol true..where are you rick?

Rickkkkkkkkkkkkkkkkk?

Ok, I've got a few more things done to the car. Didn't mean to take so long. Finally got the larger secondary injectors installed. Went with 650cc ones from RC Engineering. The primary injectors are stock. I enclosed a picture comparing the stock injector to the RC injector. Just finished most of the fuel re-mapping. Duty cycles are down to about 85% now. Still need to fine tune it on a dyno.
The drivability is almost as smooth as stock. I had my wife use the car to run some errrands, and when she got back she said it felt like a turbo RX7 now. Much more responsive.
I was a bit concerned about how well the transmission will hold up when shifting at full power. A friend at a transmission shop told me about a device that will allow you to raise the line pressure in the transmission, thereby applying more force to the clutches. The picture of it shows that you can adjust it from in the car for best performance. The unit is made for a 1993 RX7 transmission, but the RX8 one is from the same family. It goes on next.
I have enclosed some other pictures including the 1993 RX7 blow off valve, my nav display showing boost and water temp gauges (HKS CAMP), my canscan from the laptop on the car display, as well as one from the e-manage software showing injector duty cycles. It is a bit hard to read the smaller text, but it is easier than looking down at a laptop screen when driving.
After the dyno testing and transmission pressure device are installed I will let you know how it turns out. But for now, with the turbo install it makes driving the car way more fun.
Rick

couln't get the last picture in.

Oh Hell Yea !
Sounds like its time to buy a Greddy kit before the price jumps up to much.
With the raised pressure in the trans, will the "clutch rings" wear faster?
Is there a downside to the higher pressure?

From what the transmission shop owner tells me, there is less wear with the increased pressure because the clutch bands won't be as likely to slip. The pressure increase is applied only at full throttle. The downside would be that if you have the pressure too high, you will get whiplash when the transmission shifts. You want the shift to be firmer, but not harsh. I will know more about this when I get the unit installed on my car.
Rick

Very nice.

Very impressive.

I wonder how much power he's gotten up to?

RWHP?

Rick how many psi are you planning on taking GReddys kit up to w/your automatic?

For now I don't plan to take the boost over 7 psi. I may change my mind after I dyno the car. I hope to get it on a dyno within a couple of weeks. I don't think that there is enough fuel flow capacity with the injectors I am running right now. (stock primarys and 650cc secondaries).

Rick basedon how your car is responding to the GReddy kit - do youthink our automatics could handle the more powerful SSR turbo kit? Or would installing that kit require us to replace too many parts (for stability sake)?

Apex8, where did you get the pressure riser unit? Online dealer?
Thanks.

I just wanna know how much total is this whole thing costing??

Pimp in da Rx8, how do you get the button tufted diamond shape back window thing to work on the 8?? :confused:

Please tell me you also installed an auxilary transmission cooler...I'm assuming you did since their only about 50 bucks (for a stacked plate) and make a huge difference in longevity, protection, and performance.

In answer to some questions -

JeRKy8 - don't know yet about reliability - this is the first automatic Mazda I've hopped up. Time will tell. Heat is probably the worst enemy.

Crossbow - I plan later this week to add an additional cooler on the right side of the front end per the transmission shops reccomendation.

bxb40 - the pressure riser came from www.superior-transmission.com.
They carry lots of interesting transmission parts.

Will update later after more testing.

Rick

Ok i have this engine but not on a Auto box (not avalible in Europe) so it should be alot easier to fit right?

apex,

Awesome. It makes a really big difference. Have you taken any temp readings? Both the 6i ATX and the 6s ATX's (jatco not the new 6spd) have overheating issues on stock setups. I'd imagine the 8's 4spd probably is overheating a bit from the factory as well. You'll know instantly if your shifts improve with the cooler. (If it was overheating or not).

If they do, please start a thread for your fellow members, so as to prevent premature transmission failure around 60-80,000 miles. Tranny coolers are so cheap and easy to install, but are often overlooked as a modification. Most people don't realize how big of a difference they can make in the longevity of a transmission. In most cases they can more then double the lifespan...all for less then 50 bucks.

Considering the cost of a new ATX + labor, an Aux ATX cooler (stacked plate like B&M or Hayden with pressure drop protection) should always be one of the first modifications to an ATX equipped vehicle...regardless of power. As long as you run it inline with the stock radiator cooler, it won't effect the warranty in any way.

any new developments on this front?

what about the 2 extra air ports that the 6-speed has. wouldnt that be a factor in all of this. When i spoke to greddy, they said that they would think about working on a kit for the auto but they only were only going to release the kit for the 6-speed for now.

The thing is, if I remember correctly, they've already designed a system for the auto. They just did it for Re-Amemiya.

i think the one in japan trust(greedy) have the kit for auto... i haven't install that yet.. but i will found out after 20,000km after everthing run smooth...
but i heard that u only max boosting is 9psi

Its been almost a month since Rick has logged on and posted something here.. :confused:

What is there for him to post? He installed it on his car, programmed the eManage and everything works great. Long term reliability info isn't something you can glean after one month. Not everyone is compulsive about posting every tiny detail.
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I was under the impression that hewould be posting a time slip/dyno soon. Id just like to know exactly how much wheel horsepower Id be gaining by purchasing this kit for my automatic and Imnot talking about estimates either.