I know the FD comes with twin Hitachi turbos so I'm guessing that these are similar but I'm wondering if anyone knows any specifics about these. On the webpage http://www.turboengineering.com/upgr...ort/mazda.html , it's listed as:

'91-'94 RX-7 Twin

Turbo: Sport 490 Twin HT-17
Part # 603650
Components: Turbo only, direct bolt in

Anyone know anything about these?

 

The stockers are H-12s. TEC turbos...Wael El-Dasher was running them. I just posted about these a day or so ago. I forget the SN of the guy who now has them. May wanna drop him a PM, but I don't think he knows much about 'em, as he's never got his car running...

 

So they can be run Sequentially?

 

From what I read, I think so - they sound like a direct bolt in...maybe a couple mods to run them properly though - ie...boost controller, ECU, etc

 

Yeah I think I remember reading about them. I thought he just had custom turbos from TEC but at the time I didn't know they made these bolt-ins. I wonder what they're rated for. I'm thinking 490HP max by the name although that'd be a lot of HP on smaller turbos. Who knows?

 

huh, interesting

 

just talk to them. $3300 for a set. you send your in as a core and you get a set with internal modification.

 

yeah I wrote them - I'm trying to find out how much they flow and what they're rated for. If they're just upgraded internals it doesn't sound worth it. I would think with HT-14s that they'd be new housings too? (even if they use your core for mounting)

 

It's too bad that they don't give more specs on them. That's about a grand more than BNR3s, ouch.

 

Hey guys:
I've got his turbos on my car. Oh, the car runs, but after a redo of the vac hose job with viton, it is running way rich, so I've got to figure out why, and I'm running out of ideas. I'll launch a new thread on that one.....

Anyway, here's what TEC does to the turbos:
First, the exhaust manifold was purchased new, the central port was enlarged for quicker spool up, this was done by KD Rotary. Then the manifold was Jet Hot coated 2000F.

The turbos were sent out to TEC, and found that the turbine housing was not in good shape and they sourced a new one. I have no idea where they got one, but they did. They rebuilt them using 2 new Hitachi original cores. These, too, are very hard to find, as Hitachi uses Inconel turbine wheels. The compressor wheels were removed and larger wheels were installed. I believe the compressor wheels are from a T25. These are about 20% larger than stock. The setup was balanced and blue printed. The compressor housing was bored out and machined to accept the T25 compressor wheel.

The also ported the internal wastegate.

 

in comparison, using a butt-dyno, how much of a difference in response and power do you feel...???

 

Slightly slower spool-up. My motor has never run to its potential (yet), so it's hard to comment on performance vs. stock turbos. I bought them from Fritz (who parted-out Wael's car) and he felt that they ran as strong as a single turbo.

 

Based on the info you posted I think they are somewhere in between stock twins and BNR3s with regards to lag and ultimate power potential (bnr compressor wheels are bigger).

 

Has anyone checked to see what the differences are between the 20b sequentials vs. 13b? I know that the 20b's are larger, but will they fit to the 13b exhaust manifold? just a thought.

 

The 20b's are very slow turbos and apparently don't flow all that much. I'm still interested in finding out more on these HT-17s. They haven't wrote me back yet...

 

Based on the price I am not sure why anyone would be interested in these vs. some of the BNRs run sequentially. A grand more and smaller compressor wheels?

 

Fortunately for me, Wael paid dearly for the work on the turbos, and buying them used, I saved an ernormous amount of $.

 

Well I think there's a bit of misinformation going around because I got an email back and they quoted $1760.00 with an exchange and say these can flow 500HP.

 

Take it w/ a grain of salt until you confirm this w/ them over the phone or something. I emailed them a few months back re: upgraded SEQUENTIAL turbos, and I got a reply saying they just finished designing a new turbo, and have a set of sequential twins for the FD that are capable of 600hp. No offense to them, but I'll believe it when I see it.

I replied to that email for further info, specs, details, price, etc...and never heard back from them. Emailed again, and still nothing. This was like 6 months ago.

 

I don't see anything about them upgrading the shafts. If they aren't, the shafts may break because of the larger wheels at higher boost levels. I also don't see anything about upgrading the stock bearings -- the stock bearings are only 270-deg, the BNR upgrades are full 360-deg bearings. Not to say they aren't doing these things, I just don't see any info about it.

I've seen bad BNRs myself (old-style Stage 2s), and I've heard of a few bad sets out there (old-style ones again), but I think the new BNRs may really be something. It appears that Bryan has really put the time in fixing the problems on these new Stage 3s. I sure hope they're good, as I've put my money down on a set.. Hopefully, they will be done soon...hint, hint Bryan...