I'm probably going to take my life now. This is what happens when you use an ebay boost controller...

11/6/2006 11:31:38 AM

doh!

11/6/2006 11:45:19 AM

you are having all kinds of shit with that thing

sell it and buy a civic ok

11/6/2006 11:47:36 AM

and this is why I quit spending excess money on vehicles

11/6/2006 11:48:40 AM

How many miles on it?

^ you have to try really hard to blow a diesel greg... i mean c'mon


[Edited on November 6, 2006 at 11:50 AM. Reason : .]

11/6/2006 11:49:04 AM

like 4k on the motor. At half throttle last night on US 1 it hit 20psi for some reason... it should be doing like 12-14. it's a really shitty boost controller, i don't know why I trusted it. I could've sworn I heard a "tink!" sound. I mean the car drove fine after that, but there's a chance it could spontaneously blow. It has upgraded high-boost apex seals, but I don't know if that's gonna save me.

11/6/2006 12:02:37 PM

i would think it would be fine with the bigger apex seals (3mm?)
anyway goood luck man i hope she's ok

11/6/2006 12:19:43 PM

congrats, breaking a rotary is a hard thing to do.

11/6/2006 12:53:17 PM

^ not on boost

11/6/2006 1:16:13 PM

^


[Edited on November 6, 2006 at 2:25 PM. Reason : ]

11/6/2006 2:25:18 PM

so u boosted ur car?

11/6/2006 2:42:31 PM

3mm seals aren't gonna save you if you spiked to 20 psi. Time for a compression test.

11/6/2006 3:26:43 PM

You almost had me? You never had me - you never had your car... Granny shiftin' not double clutchin' like you should. You're lucky that 20 psi of boost didn't blow the welds on the intake! You almost had me? Now, me and the mad scientist got to rip apart the block... and replace the apex seals you fried.

11/6/2006 3:35:10 PM

so you blew it up or just experienced some "detonation"?

you just said the car was driving fine, so its probably fine.

11/6/2006 3:36:26 PM

even those ebay ones are OK though... you got the one that's just a T-fitting, spring, ball bearing, and allen bolt, right?

11/6/2006 5:28:46 PM

^ yes.

Anyway, to clarify, I have two Rx-7s now: an 88 turbo and an 88 nonturbo, the one with the blown tranny that some of you may be aware of. My 89 Supra spun a bearing and I replaced it with a Turbo II.

So I took off the ebay boost controller and acquired a Turbo XS manual boost controller from a friend. I carefully hooked it up per the instructions, and tightened the thing all the way so that it should run the lowest boost possible (wastegate pressure). It's still spiking to like 14-15psi. The max I'd really like it to run would be 12.

This means I have a wastegate problem. Hitachi (who makes the stock unit) turbos are notorious for shitty wastegates, on both 2nd and 3rd gen cars. They spike when you open up the exhaust. The previous owner says he did port the thing, but I guess not enough. The boost creep is only becoming an issue now that it's cold out. When it was warmer out it would just sort of boost whatever it felt like, around 11-12psi usually (or less), and I didn't mind it.

Now I've got to drive it easy until I can get my n/a fixed. Then I will have to pull the turbo (which shouldn't be a big deal really) and either take it somewhere to get it ported more or send it off to BNR which will put in a 35mm wastegate and T04B compressor (of course that's $800).

11/7/2006 12:23:23 AM

Dude nobody gives a shit.

RX-7's require an ungodly amount of love.

11/7/2006 12:30:23 AM

How much money will it cost you to get over the gimmick of a triangular rotor?

[Edited on November 7, 2006 at 12:33 AM. Reason : it sucked when it came out, and unlike wine sucks worse with 19 years of age]

11/7/2006 12:31:12 AM

pussy

11/7/2006 12:56:44 AM

BUT I CAN TURN 9000 RPMS AND KEEP A SPARE MOTOR IN THE BACKSEAT

11/7/2006 12:59:43 AM

it will be nasty with a 60-1 and you all know it

11/7/2006 1:00:59 AM

A nasty mess to clean up with oil dry and a broom

11/7/2006 7:31:38 AM

hahah gg primer...

9,10,11k rpms in a nice easy to carry unit

i think most transmissions are about 2x the size of the motor sans manifolds

11/7/2006 7:45:30 AM

my bike turns 10,500 what's ur point? my r6 turned 16000 i am not impressed.

11/7/2006 8:52:47 AM

600cc @ 16000 rpm =/= 1.3liter @8000 rpm let alone 9, 10 or 11k

not to mention the power difference.

thats like me saying my rc car engine spins 45000 rpm so the 16k in your bike isn't shit....

11/7/2006 9:18:11 AM

The factory service manual says to apply 10psi to the wastegate hose (i'll get some kind of pump) to test and see if it's working. If that doesn't work I'll pull the actuator off and see if the flapper is frozen. If it is, it's probably going to be turbo upgrade time...



[Edited on November 8, 2006 at 12:48 AM. Reason : .]

11/8/2006 12:39:38 AM

kyle, your an idiot.

11/8/2006 1:14:01 AM

^^^ What about 2.0 liters @ 9,200 RPMs? With a helluva lot more reliability than a rotary?

Sorry, obligatory S2000 plug, couldn't resist when RPMs get mentioned

I will say one thing about the RX-7...I love the styling on every one of 'em, especially 3rd gen. I'd rather have the body styling of a 3rd gen than just about any car out today in my price range.

11/8/2006 7:25:38 AM

i could be wrong but it seems s2ks don't seem to handle boost over 10psi well
from what i've read, stock pistons are too high of compression and after-market forged ones tear up the stock block. so i think they pretty much need a whole new motor to get over 400hp.

11/8/2006 7:45:37 AM

^Yah, I wasn't trying to imply they turbo well. I'm very against ever doing FI on mine. High strung NA is more the character of the car, and I won't claim it'll ever go as fast as a properly modified high dollar RX-7. I have heard of built S2000's with boost pushing 450rwhp, but I've never seen one in person and you're correct, the whole engine did have to be rebuilt to handle it. I was more mocking the fact that a lot of factory RX-7's seem to have to be rebuilt, heheh.

I'm more interested in going the NA route. If I really get into modifying it, I'll be doing things like lowering the gearing, better intake/exhaust/header, lightened flywheel, and maybe even eventually Individual Throttle Bodies. Not really aimed at getting more raw horsepower, just better response on what it has stock. Of course, I'll be the first to admit I know jack shit about working on cars, so this will be a long process, lol.

11/8/2006 8:47:23 AM

I'm not saying i don't like them... i'm just a boost junky

11/8/2006 9:04:36 AM

Quote :

"600cc @ 16000 rpm =/= 1.3liter @8000 rpm let alone 9, 10 or 11k not to mention the power difference. thats like me saying my rc car engine spins 45000 rpm so the 16k in your bike isn't shit.... "

busa's spin up to 11-12k and they are 1200cc's

jeff ill fucking kill u

11/8/2006 9:31:22 AM

rotary's don't rev that high stock people. FD's stop making power at 7500 really, and so do nonturbo FC's (a Turbo II falls off at 6500). Only Rx-8's will wind out to 9k with ease. I've been in an FD that could rev out to 9800 (hit about 9200 with me in the car, just kept pegging the tach) but that had serious engine building done, like serious porting, clearancing the rotor tips, upgrading the stationary gears (the gears that the eccentric shaft rides on), and upgraded corner and side seals (parts of the rotor tip next to the apex seal).

zxappeal has tried multiple times to convice me that a 1st gen 12a motor can hit 10,000 rpm with no internal engine modifications. In reality they are pretty much fucked over 7 grand, they break all sorts of shit.

So all that shit talking about bikes revving much more easily is correct.

11/8/2006 9:37:40 AM

Quote :

"^^^ What about 2.0 liters @ 9,200 RPMs? With a helluva lot more reliability than a rotary? Sorry, obligatory S2000 plug, couldn't resist when RPMs get mentioned "

You're comparing a <6 year old car that runs $17k-$35k to a 19 year old car that runs $2k-$6k. Apples to oranges. And I own an S2000.

11/8/2006 10:57:11 AM

Quote :

"zxappeal has tried multiple times to convice me that a 1st gen 12a motor can hit 10,000 rpm with no internal engine modifications. In reality they are pretty much fucked over 7 grand, they break all sorts of shit."

a good friend of mine has a carb'd 12a in a 1970 MGB that will hit 10k easy.

11/8/2006 11:33:28 AM

^ I love MGB's with rotaries in 'em...such a cool idea, and timeless styling on the car. Have you driven it, Optmus? I bet it's fun as hell.

Quote :

"You're comparing a <6 year old car that runs $17k-$35k to a 19 year old car that runs $2k-$6k. Apples to oranges. And I own an S2000."

I didn't say I was factoring in age of the car, price, or anything like that, or that it was a rock-solid comparison. I hardly think it's apples to oranges though. More like old, rotten apples to new apples, lol. I didn't say the S2000/F20 was hands-down better either, I just meant to say that it's my favorite high-revving engine.

11/8/2006 12:14:45 PM

I'm rather fond of the F20 as well.

11/8/2006 1:43:43 PM

Quote :

"zxappeal has tried multiple times to convice me that a 1st gen 12a motor can hit 10,000 rpm with no internal engine modifications. In reality they are pretty much fucked over 7 grand, they break all sorts of shit."

what there are three moving parts? so there is very little rotating inertia

what the hell is stopping it from reving that high?

the only possible thing are the accessories

11/8/2006 2:30:34 PM

Quote :

"serious porting, clearancing the rotor tips, upgrading the stationary gears (the gears that the eccentric shaft rides on), and upgraded corner and side seals (parts of the rotor tip next to the apex seal)."

Corner seals will flatten over 7k. Eccentric shaft will flex. Stationary gears and bearings can't take it either. The port shape also functions like a cam. S2000's have a cam profile that is designed to tach that high. Bone stock 27 year old rotary engines do not.

There's also plenty of rotating inertia. Each generation of rotary engine has had progressively lighter and better designed rotors. 12a's are 4 generations in naturally aspirated design behind the current Renesis motor.

and yeah the accessories are also a problem (water pump cavitation) but they're not the only problem.

11/8/2006 9:51:54 PM

you have that big tacky intercooler with stock turbo? gay

11/9/2006 12:25:12 PM

Uh the stock top mount is horrible. The last thing I need is to be shooting really hot air into a rotary. You can pick up significant power on stock turbo with a front mount, plus it's a hell of a lot easier to work on the back of the engine without the intercooler there.

Oh and I hooked the turbo directly to the wastgate (no boost controller) and it's not spiking--max is about 12psi in 3rd gear, although it builds boost noticeably slower. I guess I just need an EBC.

11/9/2006 10:17:58 PM

http://www.youtube.com/watch?v=3sTkaBBFjEg

that one sure revs

11/12/2006 8:57:42 PM

Weird, i've never seen a 7 with an instrument panel like that. The speedo is in km/h and the tach only goes up to 8 grand, and it sounds naturally aspirated. Cosmo perhaps?

11/12/2006 10:18:11 PM

respect the rotary

http://www.youtube.com/watch?v=Y4f0-U81YiY

11/12/2006 11:52:12 PM

My personal favorite...

http://www.youtube.com/watch?v=Au7F2ttEXWU

11/12/2006 11:56:08 PM

that is definitely what an engine is supposed to sound like

11/13/2006 12:00:20 AM

http://www.youtube.com/watch?v=Go3Fgd1wgic&mode=related&search=

yeah here is a long video about the 787B, but listen to the first few seconds of it and you can hear how crazy the idle is. that's some nasty porting (peripheral porting I think actually)

4 rotors typically make 500-600 lb/ft of torque at least

11/13/2006 12:13:36 AM

prob some rotary car in england that i posted

11/13/2006 12:43:49 AM