markusparkus

iTrader: (1)

I've seen a number of conversion threads and many of them involve building custom intakes. I'm wondering why you can't just add a turbo (I know you need more fuel, bigger injectors, aftermarket EMS etc) and run in through the stock N/A intake? Maybe you need to wire the VDI and aux. ports open, but why don't more people do this?

rotary_bünta

iTrader: (3)

dnt quote me on this but i think its because you need the turbo rotors and internals. there are certain specs that rotary needs to meet in order to be turbo. its much more than just wires piping , injectors, fuel and slapping on a turbo.

Zerkster

iTrader: (22)

6 port turbos are stupid anyway

markusparkus

iTrader: (1)

How about '6 port turbos are not necessary'. I was assuming that you'd wire open or pull the sleeves anyway.

I know that you can use the N/A internals, you just might need to be careful about the boost levels since the N/A has a higher compression ratio.

Still though, why wouldn't you do this?

20Bforme

cheaper in the long run just to do a turbo swap.

DemonicPupil

Aaron Cake has the writeup on this. You could use all of the NA components. He had to build an extender for the exhaust to put the turbo far enough out to keep it from interfering with the NA intake. Though, maybe it wasn't his. I haven't looked at it in 3 years. (My apologies for any misinformation, my memory is fuzzy)

For the 200-400 you'll spend on throttle cable, throttle body, UIM, and LIM... SOOOO much easier to just use the turbo parts. You can always port the LIM. I happen to have one for sale .

markusparkus

iTrader: (1)

You've hit on my question. Why do I need these parts? Why can't I just throw a turbo on and run the outlet from the intercooler to the N/A TB/intake system?

I'll go look for that thread by AaronCake.

markusparkus

iTrader: (1)

Ok. I believe that all of my questions will be answered here: http://www.aaroncake.net/rx-7/naturbo.htm

Thanks all for leading me to this.

2slow4stock

iTrader: (18)

Wow this thread is a fail. The person who said you need turbo rotors, you have no clue what your talking about. It's all about the tune. I've been running a 6 port set up for awhile. Also if you think about it n/a's are to be had a lot easier then TII keg's.

You run the stock n/a harness, emissions block plates on the lim, tii ecu, tii afm (not needed but for top end power), tii pressure sensor. You don't need the knock sensor, or boost controller.

It all depends on what power your looking for, I ran a stock turbo and chipped N370 with safc II and ran 11psi on the motor all day. But it's all about how much you can get the parts for as well. I personally think if I'm going to go turbo, why not just get upgraded parts besides stock parts.

It's not more of a power thing but more of a reliability issue now. I'd ran just do a 6 port turbo, no na-T for me.

I've ran my turbo set up on a n/a ecu as well, but I wouldn't run past 14 psi on n/a map unless you can retard the timing at certain rpm's. You also need to tap the front cover or change it out, and tap the middle iron and block off the injector air bleed holes.

iamxeddiex

iTrader: (1)

Why don't you just get a belt driven procharger? Oh yeah, it's not main steam enough. Want a turbo buy a T2.

Evil Aviator

LOL, rotorheads like things that are not mainstream. Here are the real problems with the Procharger:
1. No Procharger kits are available for the RX-7.
2. If kits were available, very few people on this forum would be willing to pay five times more for the kit than they paid for their car.
3. Centrifugal superchargers don't produce max boost until the engine is near redline. Even a poorly-matched turbo can do better than this.

+1

Dltreezan

iTrader: (3)

where is Ted when you need him....

-Ted

Aaron Cake

iTrader: (1)

There's no issue with running boost on the higher compression NA rotors as long as things are done correctly. "Correctly" meaning a proper standalone to control it. Yes, the stock ECU can be used (I even used an NA ECU with an S-AFC and was putting down ~270HP at 12 PSI on the HT-18) but if you want it to be reliable, a standalone is the only way to go. This goes to any turbo rotary, really. As long as ignition and fuel requirements are met, the NA block will handle forced induction just fine.

Please justify your remarks. I assume you make these comments because you have considerable experience building and tuning 6 port turbo setups, so I'd love to hear about it.

"Necessary" sort of depends. If a person has a freshly built NA block that has some money invested into it, and then realizes how much of a dead end the NA 13B is for power, then looking to turbocharge it might make sense. Especially if the car is already equipped with supporting mods like a standalone.

Many people aren't capable of the fabrication required to make a proper turbo-NA setup. True, making a 6 port TII is almost bolt on but that eliminates one of the great strengths of the NA engine: aux ports. After all my work in 6 port turbos, I have now come to the conclusion that the real advantage of the turbo NA is is variable port area. With the aux ports open, there is WAY more port are then is ever available in a 4 port. With them closed, the smallish ports are great for drivability. So combine that with a reasonably sized turbo (GT30 or thereabouts) and one has a wicked engine with an awesome torque curve and reasonable high end power (300HP). It is no coincidence that I will be running such a setup on my '76 Cosmo.

Now, if you are going for ultimate power, by all means, keep the aux ports open and slap a huge turbo on there. That is also fun, and once suitably ported and tuned, you won't notice much of a low end reduction anyway.

In many cases, cheaper and easier.

You actually can if you port match the TII manifolds: http://www.aaroncake.net/rx-7/4PortLIMTo6Port.htm

I'm unsure what Ted would bring to the conversation that people experienced in turbo-NA setups can't?

Evil Aviator

Here is one of RETed's thoughts on the subject:
https://www.rx7club.com/showpost.php...59&postcount=3

2slow4stock

iTrader: (18)

^ lol

Aaron Cake

iTrader: (1)

Sadly, that seems to echo over half of Ted's posts. While technically correct, it's almost a useless answer. The place seems to be doing fine without him...