Just wondering what upgrades can be done while keeping the stock housing
in other words:

-what turbo cartridges are the Ht12 housings compatible with? (sizewise)

for example: some people on the 300zx crowd use the sr20 turbo's center cartridges and use the 300zx stock housing.. is there anything like that for the rx7 turbos?

 

I have often wondered this also.

 

I've seen something about better "innards" for them,but I'm not sure where to get them or who makes them. I'm buying a cataloge on Friday and I think they're in there so if noone posts the ones in there, I'll do it then.

 

I don't think there's a lot you can do upgrade-wise without having something changed with the compressor or turbine housing.

Part of the efficiency of a turbo is a tight fit between the compressor or turbine wheel and their respective housing. That's part of the advantage of the '99 twins - the abradable plastic coating that gives a much tighter fit to the wheel, making it more efficient.

That said, if you get, say, the compressor wheel upgraded to a different design, the compressor housing would likely have to be changed or machined out to match the new wheel.

There's also a possibility of upgraded bearings and whatnot. The stock-style journal bearings are actually fairly reliable - I'm sure some upgrades could be made, though.

Really, if you're getting the center sections rebuilt, just get them rebuilt and installed and be done with it. I wouldn't spend a lot of money on upgrading them.

Dale

 

Ah, just saw your edit . Nope, there's no swap-in easy upgrades for our turbos - the HT12's are pretty much specific to the FD. Nissan stuff is a swapper's dream, not as much so with the RX-7 .

Dale

 

Yep.

 

The BNR upgrades use a brand new and completely different cartridge along with a different compressor and turbine wheel. He modify's the hell out of the intake and turbine housings. It takes a TON of time and its very difficult to do. As far as I know BNR is the only company producing FD turbos with new aftermarket cartridges, most just fit a new compressor wheel to the stock cartridge. The phone number is (205)640-1193 if he doesnt answer leave a message, he cant hear the phone when some of the equipment is running.

Hope if helps

 

M2 twins also, although I don't know about their availability.

 

Honda/Acura stuff is a swappers dream

 

Yeah, but Honda's don't have a TON of high-horsepower turbocharged cars to pick from like Nissan does .

90mm hotwire maf? Swap that sucker in!

Dale

 

It's so ridiculously easy and cheap to make big power on a Honda these days. That's why I've kept one as a 2nd project car. Things like free engine management, turbo parts that cost 1/3 to 1/2 of what RX-7 owners pay, and engines that are incredibly stout from the factory is what makes it possible.

I love my RX-7 and have told my wife that unless something crazy happens, I will never sell this car. Additionally, almost any Honda driver out there would love to have an RX-7. But when it comes to big, cheap, reliable horsepower, Hondas have it down to a recipe.

Sonny

 

Why not keep the stock configuration of the Turbo Housing and develope new wheels with the same circumference??.

I think a different Turbine AND Compressor Wheel design would do much to enhance the spooling and boosting capabilities of the HT-12s. Such as developing wheel blades set at a different angle to create greater/quicker air flow for faster boost climb . Designing a Turbine wheel that incorporates more blades would probably assist with a faster spool. Faster spool time equals to faster boost levels which equals to a faster FD.

But what the hell do I know,..I'm not a freggin engineer!!

 

What free engine management? My options were crappy Hondata or the $1200 PEMS. The PEMS was great, but the price....

 

OBD0 cars (88-91) use TurboEdit.
OBD1 cars (92-95) use Uberdata.

Both setups are free. I've used Hondata and have tuned several types of cars with it. I think it's one of the best packages out there in terms of what it can do for you vs how simple it is. I'm using TurboEdit on my CRX ('87) simply because I've already converted it to OBD0 and that was a pain in the ***. I don't wanna do another conversion and for what I'm trying to do, I feel like I can do without some of the bonuses that Hondata offers (like nitrous control, full throttle shift, and datalogging...but those things are coming to the free ones).

AFA the BNR twins, I would be really interested to know what CHRA they use to upgrade the HT-12. I doubt it is public knowledge though. Turbochargers.com says that they will install a larger compressor wheel for you as part of an a rebuild package, but have also said that it is a risky upgrade because the turbo shaft isn't really big enough to support a wheel any larger than stock.

Sonny

 

Your exactly right, the upgraded wheels only isnt the most reliable way to do it because of the weak shafts. Thats why BNR started replacing the entire cartridge, the new cartridge has a MUCH thicker shaft....and your right again.....what cartridge he's using isnt public knowledge but I can tell you that it has a much larger/stronger shaft. The only thing left stock on those twins is the housings and actually they arent stock either cause he has about 8hrs worth of milling and machine work that he does on them lol.

 

The worst part of the stock twins is still the hot, heavy, highly restrictive, cast iron center section. No matter how much you upgrade the turbos you are still stuck using this piece.

 

ahhh i think i know what youre looking for hehe -heath gimme a sec

 

here you go: