FC Alex

I completely, entirely, 100% agree with you! I hate when I read thread's that say I lost becuase my big turbo is too laggy so by the time I had boost it was too late, and it's not streetable. I think two things right off the bat... First well lets say your in 5 th gear going 65 mph on the freeway and a car pulls next to you, and makes a jump. Well if you're an idiot you'll either stay in 5th or down shift to 4th. But, if you have some common sense, you'll down shift to 3rd (more than 4k rpm) go WOT, and own that sucker who just tried to own a big turbo Rx-7. Second refers to the not streetable comment, okay lets all face it we don't have low end torque with a big turbo. But why the hell would we need it? We aren't driving anything that weight more than 3400 lbs and we aren't towing anything. Also, it's better to have a big turbo on the streets IMO. It means that you boost less, which means you save gas, which means you save money. It's always good to save money, and you put less strain on the motor, because your not boosting constantly.

Now these rules apply to most big turbo's but I don't think it applies to T88H or bigger turbo's on just a plain ole' street ported 13B. That their will be lag, you probably wouldn't hit full boost close to 5200 rpm.

Sorry if I sounded like a dick or anything of that sort. I'm just frustrated and needed to vent. So guys get a turbo that you will need. Don't go big if you aren't a drag racer. Big turbo's don't give you any low end torque. And one more thing, don't be one of those people that get a T70 or bigger turbo and boost below 15 lbs. Then you just bought the turbo for nothing, because you could of purchased a smaller turbo that would be more efficient in that boost range, boost a little more, and make the same or more power.

Alex

spoolin93r1

it would have to be a pretty huge port with months worth of tuning. i don't think i've ever seen those numbers. i've seen close, but never that high. mine made 439 at 16psi. i'm thinking the most i've seen on pump gas is 467whp. there are a lot of factors that come into play though. i've also seen as little as 330 with a t78

FC Alex

Ohhh, I forgot to mention that this was done by IMO one of the best tuners in the world. Also take into account that this was done with 93/110 octane mix. With pump gas and an decent tuner you should see around 440-450 rwhp at 15 psi. You are right a lot of factors do come into play but the #1 is your tuner. Are you planning and running C16 and bumping up the boost? I plan on boosting 30lbs C16 on a GT40, it sounds like fun to me!

FD3SR1

gotham racing claims 450rwhp @15psi on the hks turbo kit. i wounder who tuned that? and if thats posible on pump gas

spoolin93r1

radkins on the board has the hks t04r kit, tuned by the same person as my car and on the same boost was just a couple of hp under what my t78 put down. from what i can tell, the kits seem to put down very equal numbers. although he has a race port versus my street port

FD3SR1

i think im going to go with the to4r but whats a good bov that could be vented back to the intake? or is it beter to dump to the atmosphere? and what do you think of the PFC?I also need to do the fuel mods, I think gothams stage two fuel system should handle it, right?

FC Alex

Stand alone, fuel pump, fuel rail, 1600cc injectors (secondaries) keep your 850's and put them in the primary postion. Lastly get it tuned!

spoolin93r1

you're going to need a complete fuel system. i recommend the one rx7store sells. it has absolutely everything you need. the 7 has no need for a recirculated bov unless you just don't like the noise. the power fc is great, and i highly recommend one if/when you install the t04r. will also need an aftermarket intercooler if you don't have one

FD3SR1

I was thinking the hks intercooler would be nice, i would like to stay hks on some things. as far as the 850's in the primary spot will they fit with no modifacation?

mazda/feed

correct me if im wrong but having a upgraded flywhell wouldnt it help with the so called lag of the bigger turbo please help thanks

FC Alex

Sort of, just lets you rev faster.

FD3SR1

it will also rev down faster a heaver flywheel will keep the motor reved higher inbetween shifts.

what about those injectors? do the 850's need any mod to go in the primary spot?

FD3SR1

is it rx7store.com? for the fuel system? it took me to rx7trix.com.

FD3SR1

Mazda RX-7 1993-1996 Turbo ; T04R - S/S Manifold - Racing W/G (Off Road Use Only) - requires intake manifold modification

got that from mazda trix
so what is the intake manifold modification?

spoolin93r1

you will have to modify the primary rail for hte 850's. there a re a few threads on it. rx7store.net is the site for the fuel system. and the modification is ditched the egr valve, as most of the single turbo downpipes run very close to the lower manifold

FC Alex

I can get you super high quality fuel rails if you'd like. They're custom made.

Alex

FD3SR1

how much?

badfish229

I'm a newbie to the T78 turbocharger.

Does anyone have a compressor or turbine map for this turbo?

What about A/R sizes?

Does this turbo utilize a journal or ball-bearing?

Also, does anyone know what kind of effect a T78 might have on a 6-port RENESIS, running at greater than 7 psi?

REXtecy

I found this kit whats the advantage to the twin setup insted of twin? ive never seen this kit before do any of you know any specs on it?

http://www.rx7store.net/index.asp?Pa...ROD&ProdID=720

RX7 Twin Turbo Upgrade Kit T28 Turbo's SS Manifold, SS Dump Pipes 2 X T28 Turbo's oil feed & Drain, water lines, gaskets 2 X Venom Pro Type 1 BOV'S These kits are made to order. Please allow 2 weeks for delivery once order has been placed.

REXtecy

I ment whats the advantage over the stock twins or a single setup.

fd3virgin

mine makes a cool 325 whp at 1.1 bar. i need some retuning. i think i am having ignition break up problems. i have a stock port though. kvn

jhillyer

Yes. But also compare with restricting exhaust flow late in the cycle resists rotation of the rotor into the intake phase and defeats the torque of the proceeding combustion phase (the cycle following behind present exhaust cycle), and rapid complete exhaust theoretically reduces rotor temperature. Or, we can gag and lengthen the exhaust breath to wind-up a tiny screaming turbine at lower engine RPM which is responsive with an early performance peak creating a candidate for a second turbo.

yap yap.

GSB

So you guys suggest 3mm seals if running high boost on a T78???

I have a T78 turbo currently waiting for a trip to the garage for remap and larger injector install enabling possible 1.2bar boost pressure which is around 18psi.

Gurj

C Rock999

Hello,

Im fairly new to the T78 Turbo as it was just installed in my car along with an FC, 1600cc sec 1000 prim, twin power, rails, pulleys, exhaust, etc. However the only drawback my motor has is stock 2mm apex seals and stock ports. Please let me know how much maximum boost the 2mm apex seals will bear. And If some reason they do blow, what will the damage be?

Thanks for your help guys

eViLRotor

iTrader: (2)

You'll be more limited by the fuel you are planning on running, than the 2mm seals and stock ports. I'd say 18psi on 94 Octane is doable.