RPM Motorsports Half Bridge 13B RE RX-7 Rev and Turbo Spool

[boardinrider]

I have a simple question... what dash is in that FC

[aaroncake]

@boardinrider I think 240SX.

[boardinrider]

@aaroncake oh god No how could he do that :( I was hoping Fd I plan on doing it if i ever find a LHD dash

[aaroncake]

@boardinrider I think they chose it becuase it was almost the same width as the FC. There have been FD dashes installed in the FC before, check the RX-7 Club. But it was a huge amount of work. It is far from bolt in.

[jr13aguilera]

loOK SUPRAS ARE GAY AND ROTARY IS BETTER SMALLER MOTOR MORE POWER SIMPLE AS THAT

[yaovue]

what makes rotary engine better is the facts that it use less moving parts, light, and able to burn 100% of the air/fuel mixture in the chamber. But it also has it disadvantages like mpg and engine life.

[aaroncake]

Sort of. Keep in mind no engine is able to burn 100% of the A/F mixture and the rotary is actually less efficient at it then a piston engine. But the rotary fires much more often, so it makes more effective use of its displacement.

[jeppoification]

@aaroncake it fires the same amount of times per revolution as a 4 cylinder

[aaroncake]

@jeppoification Well, technically no. Remember that the rotors are geared 1:3 compared to the motion of the eccentric shaft. Each rotor fires three times per rotor revolution, but only once per eccentric revolution. So eccentric shaft wise, you get one power event ever half shaft revolution like a 4 cylinder (assuming a two rotor). But rotor wise, you get 3 power events ever rotor revolution. So it depends on how you look at it.

[jeppoification]

@aaroncake please read my statement again, logic dictates revolutions of the e shaft

[aaroncake]

@jeppoification We have different logic. ;-)

[Tj1056]

diffrence is that rotory go in circle and piston go up and down so that makes rotory better ;)

[ttrot17]

So I guess 2-stroke 600cc engines are really 1200cc's by that same calculation? Funny my snowmobile doesn't have a 1200 sticker on the side of it! Displacement is displacement, it is irrelevant to being 2-stroke, 4-stroke or rotary.

[dragateli]

so much flutter.... get a bov mate

[aaroncake]

The BOV was clearly shown in the video, but it was disconnected as the car was only finished a day or two before and the vacuum lines to it had not been run.

[vicxxoo]

@aaroncake i like the flutter screw the bov

[theriontom]

don't fuck with 2jz engines...13b is very nice engine...but using much oil...

[emtrixdk]

why u guys come here and bag rotary's, on top of that u guys who do know fuck all about anything,

[theriontom]

you get me wrong...i love jap engines very much...I saw videoof 3.9L rotary with almost 400hp without turbo...what's that?

[aaroncake]

Um, a 3.9 litre rotary? Mazda never made such a thing. The largest well known rotary they made was the 787B Le-Mans engine, and it was 2.4 litre.

[theriontom]

4 rotor...i saw on you tube...

[aaroncake]

If it's based on Mazda parts, and it most certainly is because I doubt anyone would be casting their own rotors and housings, it can be one of two displacements. These are 2.4 litre if based on 12A parts, and 2.6 litre if based on 13B parts.

[wtfdidusay69]

I believe it's in fact a 2.6 litre called the 26b you are referring to

[C3H8E30]

What is pretty funny is that if you sum all rotors swept capacity over 720 crank revolutions (the same as piston engines), suddenly your 13B is 2.6 liters! Ooops!

[aaroncake]

But playing by rotary rules instead of trying to put it into piston perspective, it's a 1.3 litre. 2.6 litres is just to make piston people feel better about themselves. :-)

[C3H8E30]

Nah man, I love Rota's. Best engine ever made, I'm just realistic about their capacity.

2 rotors x 654cc = 1308cc.

1308 x 3 (1080 crank revolutions to complete suck squish bang blow) = 3924cc.

Now to divide 3 crank revolutions by 3, then multiply by 2 crank revs (as per piston engine) =

3924 / 3 x 2 = 2616cc

Nice car, BTW!

[13SmokeAlot]

@aaroncake less gass more power?

[theriontom]

sorry not almost..... it's 420hp...in rx-7???

[totorofusion]

whats surprising about that? there are quite a few 400+ HP rotaries... it runs in the family lol

[2004acurarsx]

thats a tiny turbo and a p.o.s engin in there to..slap a 2jzgte in there and you would be alot better

[aaroncake]

Yes, the turbine side of the turbo is a bit small for this engine, but with a decent tune it will easily do 400 RWHP. Please explain to me what makes this engine a bad one. I'm dying to hear this explanation...

[2004acurarsx]

400 hp..thats it..i got 400 hp when i was bpu on my supra.thats that difference between pistons and rotor..13b suck point blank..2jz ftw

[aaroncake]

I don't know why I'm going to bother, but...400HP isn't bad for a 1.3 litre all things considered. And of course, a 400HP RX-7 is quite a bit faster then a 400HP Supra. Please give me specific reasons why the 13B is a "p.o.s engin". Did you happen to notice that this is a full race car as well?

[2004acurarsx]

hahaha...a 400 hp race car..i make a bet wit u..my little brother big wheel verse a tiny 1.3 pos..and i bet u my little brother will smoke u...lmao and u can race my supra its making 879hp with a gt42 turbo..lets go

[aaroncake]

This is not my car, I was just there so I posted the video. I don't really care nor do I believe that you have an 879HP Supra. Your comments thus far have been nonsensical and you've totally ignored my request for actual reasons as to why the 13B is a "p.o.s engin". If you really did have such a Supra, your YouTube account would be full of videos featuring it.

[2004acurarsx]

hahaha im jus board..i jus wanted to make u mad...my buddy bave a rx7 and we fight all day..its a nice motor but not the best..im finish..and i do have vids i jus cant post them..iraq have slow inter net...lol..

[aaroncake]

Nothing about these kinds of YouTube comments will ever make me mad, but what they do make me do is weep for the next generation.

[Parag0n]

2004acurarsx, you have no idea what you're talking about. 2JZ is a terrible front heavy engine in comparison to the 13B.

[josieonetoothh]

i doubt you have a supra... especially an 879HP one

[l2kgotrice]

I am looking for parts to turbocharge my GSLSE and I cant find anything. I would like to buy a turbo kit but cant find one. also just get it piece by piece. like where can i find a intake manifold like that? write back in my inbox

[aaroncake]

There are no turbo kits produced for the GSL-SE anymore. Anything you do will have to be custom fabricated.

[CKSRgosu]

just goes to show how little he knows. Thats why some of the fastest timeattack cars at button willow where 1800lb fd rx7s making 192hp

[Duckyistrippin]

i hope thats the blow off and not compressor surge.. cause that shit will bend the shaft and or unscrew the compressor wheel.

[aaroncake]

Blow off valve was disconnected during filming. Compressor surge is not nearly as bad as many people would have you believe.

[Duckyistrippin]

uhh...yeah, it is. ive seen more than one teeny weeny 4 banger go kaboom over a seriously ill sized turbo unscrewing itself and grenading both the turbo and occasionly the motor. its not horrible, but its devastating to the life of the snail. if ur surging ur moving more air than the engine can handle and ur not making power and losing effeciency, so why bother.

[aaroncake]

Any turbo that is not sized to the application can be an issue, regardless of whether there is a BOV or not and that's where the issue lies. Remember, there are a LOT of OEM vehicles out there without BOV/bypass valves. It's almost impossible to get a rotary into surge where you are pushing more air then the engine wants...we use appropriately sized BIG hotsides and BIG compressors because our engines use a LOT of air.

[Duckyistrippin]

who said anything about bov's, a bov definately will not control surge. and true a wankel will handle a MUCH larger turbo than a piston engine, largely due to how they come to there displacement is total b.s. 1.3litre my butt. great little motors though, they are lots of fun. we ran them in our sand cars before we could afford the ls1's we now use.

[IdidURmom2]

i think i just got a hard on

[thugathugacation]

man this thing sounds amazing.

[monsterbox123]

excuse me for the name calling...wasnt thinking that was very teenager'ish....but I have seen the twins last a long time...have you every heard of the upgraded BNR stage 3's..Upgraded compressor wheels and 360 degree thurst bearing, cheaper than the mazda 99spec replacements and they flow up to 450rwhp in sequential mode!

[aaroncake]

Occasionally, they will have good life. But that is the exception and not the rule. The BNR "hybrid" is basically a new turbo. Everything is replaced but the exhaust housing. I've never been a big fan of hybrid turbos. The stock hot sides are way too small for high HP, leading to very high pre-turbine EGTs and boost control issues.

[StraitRunna]

Where did you find your source on that 450rwhp quote? You are clearly dreaming, Twins would never be able to pump that much power ESPECIALY on a half brigded 13b. The BNR's are not capable of that kind of power on a half briged 13b. Maybe if your lucky with a street port but thats beating everyones record usig the BNRS.

[EMG4Life]

i dont think that the turbos could effectivly flow that much air for 450rwhp.... you do realize that if that were true alot less people would buy supras?

[monsterbox123]

i must say however I do like the successful half-bridge porting and the spool it brings along...alot of people disagree with half bridging I think its actually quite useful and not as parasitic on the low end as bridgeporting

[aaroncake]

The more experience I gain with bridgeports, the more I am of the opinion that you should go all or nothing.

[monsterbox123]

13b from a cosmo....um no...thats a 20b in the cosmo

[aaroncake]

Sigh. The Cosmo came with either a 13B or a 20B. 13B-RE versions (similar to the 13B-REW used in the 3rd gen RX-7) were far more common then the 20B-REW version.

[KAOSasus]

is it from 93+ rx7? engine ?

[aaroncake]

No. It's the 13B from a Cosmo.

[KAOSasus]

is it posible 2 put from 93 rx7 on this 88 rx7

[aaroncake]

Possible, yes. But the 13B-REW has a totally different mounting arrangement, the twin turbos are difficult to control and highly unreliable, and nearly every external component will need to be fabricated.

[monsterbox123]

your a dumbass...twin turbos are high realiable...its the vaccuum line system under the intake manifold that messes up due to old rubber hoses...silicon hoses make the entire system one of the best sequential turbo systems ever designed in terms of spool and delivery

[aaroncake]

The FD twins are junk, plain and simple. Average turbo life is under 50,000KM. When the system runs well, it's a great system. Unfortunately the 70+ vacuum hoses used make for a very unreliable mess. Also, please don't call me names. There are ways to disagree without insulting someone.

[justins13brolla]

ya those look like enkeis

[PHDMuZzA]

i cant realy tell from the angel but the rims look like enkei rp03,, r they??

[3star2nr]

compressor surge?

[vspecluvah34]

rotarys can spool turbos easier than most cars because of the amount of air that flows through the engine..most people dont realize that a turbo2 will flow more air than a big block with a blower on it..1.3 liter but 1.3 per rotor housing...

[lazzer408]

Actually it's because it's a ported exhaust. There's more of a "shock wave" to it.

[aaroncake]

Actually, it's because it's a bridgeported engine. The misfires at low RPM really hit the turbo hard. Also of course, the exhaust path out of the rotary is a straight shot to the turbine without any ridiculous valving in the way. Ported exhaust doesn't hurt either. :-)

[henrymca]

seen this car in person and its a monster

[S14R1]

wasnt that sputter?

[aaroncake]

Base map...

[ripmeup]

How da fuck do u get a rotary to spin a .96 turbo so easily, I could only get my turbo schwitzer spinning at 5000rpm, and thats when it started to boost, with a .74 rear.

[aaroncake]

I have a GT40R with a 1.06 housing on my bridgeported 13B and it's a little small...Really I should be running a 1.15 or larger. Once it's on the road again I expect to see full boost before 3000 RPM. I don't know what a Mitsubishi Cordia is, but I'm betting it's a tiny 4 cylinder? The rotary moves a lot more air then you'd think...

[drantman]

Im running a 1.15 stock engine and find that fine ?

[aaroncake]

That's a bit big for a stock port engine, but of course it depends on the compressor as well and trim of the exhaust wheel. Generally I like to stick to just under 1.0 for a stock enigne. For a bridge, 1.06 and above (real men run 1.32).

[crazzykid277]

what sise is the turbo do u kno

[aaroncake]

Read the description. TO4R w/P trim 0.96 hotside.

[sherwie]

compressor surge....please help the turbo

otherwise...

bad ass ride you got there

[aaroncake]

Not my car, I was just there filming. The BOV was disconnected...