there's a guy local to me running a T-78 on his 2JZ.. who's maxed it out and wants something bigger.. so he's selling it for a reasonable price..

he's getting full boost by ~3,000 rpm and kick in the pants by 3,500

i'm guessing the Rew wouldn't be far off..

but before I shell out for this turbo I wanted to hear other ppl's experiences with it first..

the mistu greddy turbos are bullet proof and last forever from what I've seen.. and that appeals to me... the T78 and 88 are well respected and tried and true turbo's in my neck of the woods...

(yes I know they're old school..)

I've got stock ports on my motor on a fresh rebuild... engine is in great shape and very healthy.. I think it's time for it to get a well sized well breathing turbo..


so basically if you have experience with a T-78 please post!

What size back were you running? 14,17 or 24 cm^3?

which manifold did you use? the shorty or long runner?

which if any port?

how was the turbo's behaviour and characteristics?

power band? effeciency range? streetability? lagginess? overall happiness with the turbo? etc

 

There is probably more info on this kit than any other kit ever produced for a rx7.

500rwhp around 20psi, a little laggy but it does have an extremely smooth linear power band. It is a great proven turbo, but not the newest technology.

Just buy a brand new t04r or Borg Warner s366 and get similar and better results.

 

Why stock portwork on a fresh rebuild? I know I wouldnt like driving a stock port/t-78 setup on the street.

I agree that they're bulletproof, I also agree that there are 17 million threads out there about the t-78

 

Run the 17 cm^2 housing, if it's anything like Holset turbos (which have hotsides rated in cm^2) that's going to be a bit like a .82 A/R T4 hotside. The 24 cm^2 is probably closer to a Garrett 1.15 or 1.30 hotside

 

yeah man So I thought...

I searched the archive.. and the threads..

"greddy t78*"

"greddy t-78*"

and came up with little results..

perhaps I wasn't searching properly..


I was looking for ppl who've ran the turbo.. and their feeback..
not really the "so I've heard types"



well when I had the motor open.. I didn't have the heart to take a Die grinder to it... even with the Judge ito template I had.. out of fear of messing things up and being out a motor.. so I didn't risk it..

besides.. correct me if I'm wrong..

but don't large ports increase bottom end lag but improve top end flow/power?

(at least thats what they do with piston motors)

 

478 @ 17.5lbs of boost @ 6800rpms 550cc/1600cc @ 70% injector duty


this turbo has so much potential but everyones going with the new turbos saying this is old technology.

however as old as this turbo is its still a big power gains!

that stock port is going to net you my power around 27lbs

 

thanks for the info..

how large is your port?

what is the spool up like on your car?

 

street port

spools at 3700rpms full boost @ 4500

 

I used the T-78 on both my RX-7's. Was a good turbo back in the day but spooled slow. I wouldnt use it today just because there are better options.

 

spooling will depend on the porting
i only used it with ported motors and its a little laggy(not too bad) but dont expect the response anywhere close to the twins

garret t04z is the way to go though in my opinion

 

Do u guys know if there was any revisions made to the turbo? or was it just a newer more blingy compressor housing and that's it?








yeah your name came up a few times whilst I was searching..

I'm guessing you would suggest something like a GT35R with 1.0 A/R on a T4 flange correct?


the only problem for me.. is shipping is exuberant..

my greddy SMIC for example cost $140 to ship.. and that's a small chunk of alum.


the ppl in my area have a bigger is better mentalitity..

T88 GK aka "the king" is the 'norm' they run..

and then after that it's the GT42 45 etc boys on the drag cars..

things like To4E and GT35's are on the 4 cyl cars usually.. and have a much smaller back then i want



it's not like i'm Dying to get a T78.. it's just one of the "smallest" turbo's that i could find for my car.. if that makes sense.. and he's asking about half the retail price and it has less than 2,000 miles on it..


but before i put a mismatched turbo on my car.. I wanted to do my homework first..

 

it's a tad laggy but your still moving out while spooling up. it's not like the car isn't doing **** until you hit full boost.

like someone said above... very nice linear pull to it. i like the T78 a lot!! it will be just fine on your stock port.

 

13bmaniac is selling a t-78 brand new for 2800 shipped( i think) check it out with him and its not a bad deal if u are going to go with that

 

I have ran several of these kits, the info I gave you is dead accurate, it is a great reliable turbo, good power but caps out around low 500rwhp, laggy compared to other things on the market but not extremely laggy by any means. It is a great turbo, but for the price you can often find better setups.

 

how does this turbo compare to the t04r on stock ports since that is what the op is working with, and me as well...

 

I can compare the two on two identically ported engines but not stock. The TO4R I installed for a customer was the .84 exhaust housing, it hits 15pis right around 4k maybe a touch before, t78 was hitting 15psi around 4500-4700rpms.

It really depends on your goal, so many guys are shooting for 500-600rwhp these days. You have to draw a line between good response and good power at some point. A lot of the comparison to the t04r will hinge on the exhaust housing and your ultimate goal for your individual car.

 

the exhaust housing i have on my t04r is 1.00, and a .70 on the compressor size. i think it will be a bit "laggy" but time will tell.

 

imo i think its the psi and not the hp wise. mine didnt start going out of breath until i reached around 27lbs, at 17lbs im making over 500 so theres alot more to that turbo than most think. its just that not many have dont big numbers since they go other routes

 

I think is by far one of the best kits for the Fd you get a lot of power around 15 psi, the quality is awesome as well. include every part for install.
I think is a great kit for the street i got it on my first fd and y buy it again with blind eyes but i have to let it go for monetary reason.
Sorry for the offtopic bt im selling a kit brand new 2800$

 

Depending on your setup figure around 4200-4700 for 15psi.