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RX-7 Build up
It's been a while since I posted here, but my rotary motor is complete and the car is near running again. Just thought I'd show ya'll some progress along the way.
I have made a blog to journal my progress and it can be found here... http://www.87rx7.blogspot.com/ http://photos1.blogger.com/blogger/4...0/400/rx02.jpg Old motor http://photos1.blogger.com/blogger/4...0/400/rx11.jpg New Parts http://photos1.blogger.com/blogger/4...0/400/rx10.jpg Ported secondary Plate http://photos1.blogger.com/blogger/4...0/400/rx17.jpg Balanced assembly http://photos1.blogger.com/blogger/4...0/400/rx15.jpg New, Polydyne coated, turbo, exhaust manifold and downpipe |
http://photos1.blogger.com/x/blogger...59996/rx23.jpg
Coated Rotors http://photos1.blogger.com/x/blogger...39607/rx23.jpg New, coated rotor housings http://bp1.blogger.com/_AEAL2Ej4Lgw/.../s400/rx38.jpg Motec ECU. The M2R is specifically made for 2-rotor applications http://bp1.blogger.com/_AEAL2Ej4Lgw/.../s400/rx40.jpg Stationary Gears from a 3rd Gen RX-7. Allows more oil behind the bearing http://bp2.blogger.com/_AEAL2Ej4Lgw/.../s400/rx43.jpg Motor Assembly pic |
http://bp3.blogger.com/_AEAL2Ej4Lgw/.../s400/rx47.jpg
Another assembly pic, showing studs http://bp1.blogger.com/_AEAL2Ej4Lgw/.../s400/rx60.jpg Koni Shocks http://bp2.blogger.com/_AEAL2Ej4Lgw/.../s400/rx58.jpg Part One of Motec Install http://bp1.blogger.com/_AEAL2Ej4Lgw/.../s400/rx65.jpg Engine Install http://bp2.blogger.com/_AEAL2Ej4Lgw/.../s400/rx68.jpg Engine Harness Install |
No r26b? You *****! Jk, nice build. I've always wanted a FC, but the prices around here are ridiculous! $3000 for a NA with blown apex seals!!
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ya, i like my 13b thanks. :yes:
My brother just sold his NA FC for 800 with blown a water seal. My buddy found a runnning NA for 50 BUCKS! and parted it out. mine was about 4k running. You can find tons of cheap FC (turbo or na) if you dont mind building it yourself. check http://www.rx7club.com/forumdisplay.php?f=108 |
ripped out the old interior this weekend. Time for cleaning, then I'll install the new black interior.
Before http://photos1.blogger.com/x/blogger...1225/rx2_3.jpg During http://bp3.blogger.com/_AEAL2Ej4Lgw/.../s400/rx73.jpg http://bp1.blogger.com/_AEAL2Ej4Lgw/.../s400/rx70.jpg After, coming soon |
Wankel!
Felix Wankel - My Hero
It's unbelievable how simple those engines are. In my IC engines class in college our Professor showed a picture and parts list of a normal reciprocating overhead valve engine and a wankel rotary. It's crazy how few parts they have. My prof. actually did some research for John Deere on the shapes of the combustion chambers in the rotors. I'm not sure what John Deere would use one for, but cool nonetheless. Update us with some HP/weight ratios when you get it done! Good Luck, Brandon |
thanks for the commnet brandon.
yeah, good ol' Dr Wankel. I beleive there is 3 moving parts inside the motor. I've found that for some reason, mazda leaves the oil passages on these motors WAY TOO small. It is so constricting, that is strains the motor once you start to mod them. There are a few right angle turns in the passages as well. I've had this motor's oil passages completely re-engineered. not only have they been widened, some have been blocked off, and re-routed to ensure more oil, and more free-flowing passages. I beleive piston engines had a problem with oil passages at on point. To remedy the problem, they did something very similar to what we've done with my rotary. I'll hook yall up with numbers as soon as I get em. As far as wieght, I am expecting somewhere around 2300 lbs. I am not gonna keep the interior gutted, I am only switching to a nicer trim. I'll do what I can for weight reduction, but I can't sacrifice style. |
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hey mazspeed. those first gens are damn light huh?!
You're right, It'll probobly be more like 24-2500 lbs. I have done some wieght reduction, but it isn't a huge priority for me. Like you said, the cars are pretty light already. I've got BBS rims. They are much lighter than stock. Ditching the spare tire, lightening the suspension a little. I'll ditch probobly about half the insulation under the rugs. (a friend took out insultaion, carpet, and sound deadening. About 40 lbs total) Ditched power steering, cruise, removed LOTS under the hood (emmissions, extra BS), lightened flywheel relocate battery, better wieght distribution It doesn't add up to a ton, but I think 2500 would be pretty easy to obtain. Did yall run turbo set-ups on the FB? |
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i'm gonna go auto X with this.
I know of a couple 2-rotors that are in the 450-500 range. Mine should be around 320 hp with stock turbo. It isn't too difficult to do with the right turbo, and proper porting/mods. My buddies 2nd gen smokes BUILT supra's and hangs with bikes. You can make all the power you need with a turbo rotary. NA is a little tough to really make power tho. Seems like you exoplored that with the PPort! :unibrow: |
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If you really know turbos, you realize there is a wide range of variables effecting spool times. I'd agree with you to some degree. A big turbo with a small turnine housing will take a year to spool. There are plenty of variables in the equation, and we've built this motor specifically for this application.
I'll start out slow and let you know how the T2 does on auto x. Thanks for the comments. |
http://bp1.blogger.com/_AEAL2Ej4Lgw/.../s400/rx75.jpg
relocated oil filter, went with a MUCH bigger one as well. |
Finished the Battery relocation this weekend.
http://bp2.blogger.com/_AEAL2Ej4Lgw/.../s400/rx81.jpg http://bp3.blogger.com/_AEAL2Ej4Lgw/.../s400/rx83.jpg Also got half way done with the black interior conversion. Before http://photos1.blogger.com/x/blogger...1225/rx2_3.jpg During http://bp2.blogger.com/_AEAL2Ej4Lgw/...s400/rx71..jpg Almost done http://bp3.blogger.com/_AEAL2Ej4Lgw/.../s400/rx84.jpg |
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read through this I couldnt help but think that newer cars seem so easy to work on cuz they don't have rust holes.
This is a cool project i have allways liked the RX-7's like yours reminds me of a 944 which I also like the looks of. Good luck with the project and keep us updated. |
thanks for the comments. I always think that older cars would be easier to work on because they have HUGE engine bays and less/no electronics! :D
These cars did get some criticis when they came out. people were saying they where too much like the 944s. I definetly dig both cars, but since this is my 2nd Rx7, you can tell which one I like more. |
my car prior to my current 64 cutlass was a 95 z28 and changing the spark plugs on that thing was about the hardest automotive task i have ever done it took like 8 hours and no its not cuz i am retarded :) i am currently replacing floorpans and the spark plugs on the camaro were harder. you are right for what you gain in engine space and simplicity you lose with fixing rust and doing bodywork. i guess its just trade offs.
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the update this week:
The Koni coil-overes are installed in the rear. http://bp1.blogger.com/_AEAL2Ej4Lgw/...s400/rx108.jpg This is the lowest setting. http://bp1.blogger.com/_AEAL2Ej4Lgw/.../s400/rx94.jpg I dont really like the look of this, but for now it works. Eventually, I'll get gauges that are all the same style and brand. I'd also like to create a custom mount under the stereo unit so there arent gauges clustered on top of the dash. http://bp3.blogger.com/_AEAL2Ej4Lgw/.../s400/rx90.jpg Close up of the oil lines and fittings. These little things add up quick:willy: http://bp1.blogger.com/_AEAL2Ej4Lgw/...s400/rx103.jpg |
Yeah the little things add up real quick!! I like you build very interesting:thumbsup: What kind of exhaust are you going to run
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:cool: thanks very much!
I am doing an interchachable mid-pipe. It will be either a straight pipe, or a high-flow cat... depending on weather or not I need to pass emmissions. LOL Then I'll put a borla muffler in the center and shoot the pipe straight out. Single exit:unibrow: |
Everything is together and ready to go.
We are just trying to get it started now. The ECU is hooked up and is communicating with the laptop. All sensors are working, fuel inj and pump is working. We just haven't got a solid enough fuel map to get it started. If anyone is good with motec and can give me some pointers, I'll buy ya a few beers when you come to AZ. Thanks |
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i dont know if we need a programmer, but maybe I could see if they have a turboII map we could use.
I think we just need a solid map to start with. the NA map doesnt get us close enough becasue of fuel issues (smaller injectors, higher compression...) That guy Mike Johnson, he was a rotor head? Thanks Mazspeed. |
There is a guy at Motec (Simon) that will be helping us the next couple days.
:thumbsup: |
She's running!!! Very happy!
Damn is she loud tho. Apperntly, the N/A base map that we had sucks, even if my car was N/A. We are having a little problem with one of my trailing coils. looks like it isnt firing. Hopefully we can get that worked out. I dont want to have to buy a coil pack just yet. |
Car is running really smooth. The engine builder says he's never seen a rotary run so smooth with so little engine vibration. I guess the engine balancing paid off.
We put an exhaust on it. Very simple system. Its a huge MagnaFlow muffler with an exit before the rear passenger tire. The problem with the coils was just a simple wire in the wrong place. Got some new custom leading spark plug wires. Since I relocated the coils, the wires were too long. The car wieghs 2500 lbs. And that's with the spare. :wow: I still need a new alternator, and under-drive pulley and some type of wrap for the wire harness. And the care needs to be tuned under load. That's it... And I'll have some pics tomorrow. |
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I'm sure you know what they sound like straight pipe. there were people coming out from everywhere to see what it was :lol:
http://bp1.blogger.com/_AEAL2Ej4Lgw/...s400/rx118.jpg K&N air filter, I wish i coulda found one with element on top... |
Pics, as promised
http://bp0.blogger.com/_AEAL2Ej4Lgw/...s400/rx117.jpg
Huge MagnaFlow muffler. It is really pretty quite with just this one, but has lots of bass. I may end up adding one more muffler. http://bp3.blogger.com/_AEAL2Ej4Lgw/...s400/rx116.jpg New wires for the leading coils. http://bp0.blogger.com/_AEAL2Ej4Lgw/...s400/rx113.jpg The wideband is wired up. After the tuning is complete, we will get the wideband connected to the ECU as well. http://bp1.blogger.com/_AEAL2Ej4Lgw/...s400/rx114.jpg Here is how the NA throttle cable hooks up. http://bp3.blogger.com/_AEAL2Ej4Lgw/...s400/rx112.jpg A couple broken 7's. For once, mine is the closest to being finished. I have some video of the car running, just need to host it somewhere. |
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I have been following your build
great looking project. I am thinking of picking up an FD R1 bi-turbo. I cannot decide if I want to mess with the rotoray or drop in an LSx motor. Which forum is the best or who do I need to speak with for information.
Thanks |
If you get an FD, it has TONS of potential. You will also find that the FD is where the rotary gets a reputation for unreliability. The twin turbos are terrible; as is the radiator and intercooler. There is a check list (of sorts) of reliability mods that should be first priority. The motor, tranny, and suspension is great.
Below are links to the most active Rotary forum. It I've heard the FD section is a bit more tame, but some of the sections are pretty rough (rude, sarcastic, etc). FD section http://www.rx7club.com/forumdisplay.php?f=16 Engine Conversion Section http://www.rx7club.com/forumdisplay.php?f=118 My car is finally back at home. We are tuning every night this week!! :willy: http://bp2.blogger.com/_AEAL2Ej4Lgw/...s400/rx119.jpg |
http://bp1.blogger.com/_AEAL2Ej4Lgw/...s400/rx124.jpg
new alternator from a 3rd gen RX-7. also got a dual pully with a rotor shape on. The rotor shape it's self is rumored to add 20 HP! :unibrow: |
http://bp1.blogger.com/_AEAL2Ej4Lgw/...s400/rx129.jpg
picked up this complete V-mount set up. came with the throttle body adapter, piping, and blow off valve. I took the car out tuning this weekend. So far, it's tuned as a non-turbo. still needs a little more work, but I was able to get it up to about 100 mph on the NA tune. http://bp0.blogger.com/_AEAL2Ej4Lgw/...s400/rx126.jpg I also picked up this new underdrive pulley. Its has 4 timing marks. Should have the new clutch hydraulics hooked up soon. I may go out tonight to finish the NA tuning. I've driven the car around town a little this weekend. Drives nice, but I miss the turbo!! |
took her out tuning under boost last night.
We had the wastegate rod disconnected, so there was basically a large hole in my exhaust. With that in mind, the stock turbo put out 20 lbs!! I couldnt believe it. I am gonna have to get a large wastegate on that thing to control boost. Anything over 12lbs probobly isn't adding power due to the amount of heat blowing through that turbine. Car ran fine though. All gears feel good. I need to get the clutch hydraulics replaced so shifting is a little smoother. The new rear coil-overs and larger tires make a huge difference. I know I was going fast, but it feels easy to handle. It didn't feel as fast as it was. (make sense?!) Water temp- solid 190 EGT- 900-1400. usually around 1150 intake temps- 140-ish. A little high, intake still needs to be placed outside engine bay |
Car is running well. I am having the injectors test for dead band timing by www.yawpower.com The owner of this shop has been helping me get my car properly tuned. He is a motec dealer. This ECU is reall slick. Once I purchase the advanced tuning, it will basically autotune it's self based on lambda. :wow:
Also installed water/meth on the car. That is the FUN JUICE for sure!! Keeps the new motor clean, and keeps intake temps down. Also keeps the car from detonating. Once I get the car on closed loop tuning, I'm gonna hook up the methanol injector to the ecu so it wont be a linear spray, but curve based. I hope to get this thing on a dyno and on the track :willy: http://bp1.blogger.com/_AEAL2Ej4Lgw/...s400/rx143.jpg I'll try to get some picks of the water/meth system ans any other updates I've got going on... |
WOW, it's been a while since I updated this thread. It's been a hairy couple months. I had to get my car through emissions. That was pretty tough. I ended up having to put a catylitc converter, air pump and charcoal canister on the car. I also leaned out the mixture to the point where the car barely ran and disconnected the wastegate rod to keep the smog monkeys off the boost.
Here is my Uber-Tyte emissions exhaust. http://bp2.blogger.com/_AEAL2Ej4Lgw/...s400/rx157.jpg http://bp3.blogger.com/_AEAL2Ej4Lgw/...s400/rx156.jpg Basically, it's just a cat and a couple feet of pipe. This is the actual exhaust I run now. http://bp0.blogger.com/_AEAL2Ej4Lgw/...s400/rx162.jpg I FINALLY got my solid motor mounts. Much better than what was in there before. The old ones collapsed... http://bp2.blogger.com/_AEAL2Ej4Lgw/...s400/rx149.jpg This is where my CAI was mounted before. It sucked. I busted 3 K&N air filters with this set up. http://bp1.blogger.com/_AEAL2Ej4Lgw/...s400/rx151.jpg |
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