Is the GReddy T78 turbo streetable?
 

Someone told me that the T78 turbo was very streetable. Is that true in your experiences?

Thanks in advance for your input!

What is streetable or not streetable is a matter of opinion.

To me, there are better choices out there for streetability....

What are your rwhp goals and at what boost level and with what mods? Do some snooping in the single turbo forum here... I'm sure that many of your questions can be answered by using the search button :)

I love it, have found it to be a blast on the street.l

I have used the T-78 on both my RX-7's and its great for the street. A little on the laggy side but thats what downshifting is for.

Jason

Love my T78, but for daily driving I just run 10psi. I think thats around 350 at the wheels. Yes its a little laggy compared to the BNR's I had running non-seq, but the kick in the pants when the T78 spools makes up for the loss on the low end.

It doesnt take some adjusting to your driving style, going WOT when the wheels arent straight isnt a good idea :)

But any way you go, go single ! .... Less stock crap to deal with

^indeed single turbo is the way to go.

Streetability is a interesting thing, especially when talking about single turbos. Having a single turbo is like having two cars in one. With a larger, laggier turbo, you can putz around town up to 4500 rpm without getting into too much boost. If you want full boost sooner, just downshift. With a GT series turbo or a much smaller t-series, you are into full boost way before the 4500 mark, which I personally don't think I would like for driving around town. With a GT series turbo, if you want to go a little faster in town, but stay out of boost, you have to up-shift, and then you lose much of what little torque we make in that power band. I'd look at it this way: You're either full on or full off from either 3500rpm (gt series) or from 4500 (t-78). With the t-78, you get an extra 1000 rpm in say 2nd, 3rd, 4th gear when your out on the street and don't want to be boosting. To me, this sounds more "streetable".

Well your analogy makes absolutely no sense because if you're not going full throttle you're hardly going to make any boost at all with the quicker spooling turbo.

btw,
you should save some money and buy mine, because I loveddd it.

http://i72.photobucket.com/albums/i1...Picture062.jpg

Personally I feel a 35R is much more streetable than a T-78. I *like* having full boost at 3500 rpms :)

nooo rich noooo

why do you think I went with the 500r instead of a Greddy T-78/Turbonetics T-66/Garrett T04R ;)?

Didnt have the balls for the big boy turbo? :buttslay: :buttslay: :buttslay: :blue: :rofl:

I Agree With Wargasm. What Are Your Goals. I Run Greedy T-88 On The Street. Love It. I Just Love Keeping The Rpms Above 4000.

Well, based on the sheets I've seen, the 500r makes just as much power at a similar boost level as the antiquated T-78 does (450 at 15 and 500 at 20) but spools much quicker (15 psi by 3500 rpm). Plus, it's claimed you can push the 500r to run just as much peak boost as a T-78. Why have lag when it's not needed ;)?

Your dyno sheet says otherwise. 421=/= 450. Also at 17 psi.

muahahaha

I have seen a couple of dyno sheets on the 500r and the only one that put down similar power to the T-78 was on A-specs dyno. The others were a lot lower and at higher boost. Although there are other variables that play into that like engine porting etc..

Nice try, but that dyno sheet is from my old setup (BNR stage 3 twins). I have yet to dyno my new setup.

Here, click this link:

https://www.rx7club.com/showpost.php...4&postcount=13

Then change your sig buddy, you have it as 500r powered, but list 421whp. nice try my ass- if you knew how to set up your sig properly it wouldnt have been mentioned. BTW a-spec kits are known to not put out the #s claimed. IE, 40r. EXACTLY what jason said THEIR DYNO- THEIR KIT, of course its going to magically make the #s claimed. Ill stick to proven power, a lot of these newer kits just arent performing they way they are advertised.

How come noone posts track #s anymore? Scared their 450whp beasts are going to trap a mph relevant to the real whp they are putting down??

Well, if you want to be a prick, that street runs both ways, junior. First off, I'm not your fucking buddy.

Second, when you click the dyno link in my sig, what do you see under the hood? Exactly.

Third, show a little respect to those who have been in this game a lot longer than you, and contributed a hell of a lot more to the community than you.

The difference between you and I in this thread is that I'm informed. I know what is inside a 500r, and you don't. That's not your fault, it's not common knowledge. I guess I'll see what my setup makes soon enough, but I've been around enough T-78s to know that they're too laggy for my personal tastes and application.

Ghost. Dont mess with Rich, he is a good guy.

T-78 ha! Talk about a paperweight. Can it make good power? Sure it can, so can $50 eBay turbos. I've seen T78 cars make under 300 hp and make over 500 hp the turbo is only one small part of the whole equation.
The Trust (GReddy) is proprietary modified Mitsubishi turbo that weighs a ton, isn't water cooled and has none of the benefits of the newer, more efficiently designed GT series ball bearing turbos.
It's also next to impossible to get authentic parts for when it comes time to repair so you end up with a Garrett hybrid anyways. You also get squat for support from GRedddy.

Wow, I do not disagree that the GT series are better, but I would not call the T78 a paperweight at all. Any turbo set up capable of well over 500hp is no paper weight. Did you have a bad experience with Greddy? I have always had good dealings with them...

PS. You just compared a 50$ ebay turbo to a 4k kit. :rlaugh:

Thanks Mirabile. I think we should all avoid shitting on each other, after all---we're all FD owners, right?

The eBay turbos can make as hp. AFAIK the eBay kits also don't require you to dent your downpipe or shave your lower intake manifold to get them to fit.

+1 on that

Glassman, can you show me some numbers on people making 450+ hp on one of these ebay turbos.... :molepoke:

well, i'll just throw some of my views out on this :)

i've actually installed T78's and a one of the new A-spec 500r kits all on FD's and crazy enough... stock ported. one includes our 3rotor car.

regardless these are my thoughts on the T78 and this is just from my personal experiences on customer cars:

- not as laggy as people think. i often see 10psi by 3000 -3200rpms and 15+ under 4000rpms. these cars all had 3" exhausts and included the wonderful dent in the downpipe hahaha :D

- these turbos are a little on the heavier side but they are very reliable... especially for the person wanting a high boost application! i've personally seen these turbos run at 25+ psi on daily driven setups (piston cars, but methanol injection is your friend). and yes that means they have one boost setting and it's that high, not 10psi day and 25 weekend ;)

- wonderful power curve. pulls insanely strong till you need to shift. we have had varying numbers but our best was 460 @ 16psi on a 2 rotor and we did 540rwhp @ 11psi on a stock port 3 rotor we built using FD plates. we recently did one for a guy who just had a mazda reman in it and @ 10psi we saw 300hp before there was some insane ignition breakup at 6k plus so i'm sure it would have been plenty more for such a low boost level. these are dynojet numbers by the way... altho we mostly tune on a mustang dyno.

- the T78 has great housings as they flow very well and really help with top end power and keeping egt's down.


now here's my opinion on the A-spec 500r kit:

- also a well built turbo. it's wheels are very very similar to that of the T78 but is smaller on the turbine side.

- you have choices of what hotside to run.

- the first car i put this kit on was a stock port FD. spool up was nice but i wasn't seeing 15psi under 3500. it DOES have a more linear build up than that of the T78 but after literally driving both back to back it's not that great a difference.

- on said car we barely saw 300 @ 10psi. i'm installing another 500r very soon and both cars will be getting tuned for 15 or so psi shortly so we'll see. but i have street tuned one to 12psi and it does have a good 'seat of the pants' pull to it but it still feels like a 300rwhp fd. NOW granted... this is a conservative tune to an extent. we don't want these people blowing their shit up when they leave just so they can say 'i got 400rwhp yayyyyy'. which honestly there is so much hype on the 500r that it's been a hassle to us because we keep hearing "a-spec made 450 @ 15psi so i know i'll get atleast that", we actually have one guy soon to order the kit that said "when you tune my car, just tune it for 500rwhp on pump... that shouldn't be an issue from what i read"... oh noes

THAT ISNT A SPEC'S FAULT... these kids just read the hype on here that alot of people have built up, yet most of the people that talk about the numbers they will get... haven't actually dyno'd their car. i have another shop that did a 500r recently and they have yet to be able to break the 400rwhp mark on pump gas (stock port rew). they don't want to go over the 15psi mark... altho they are very very close.



ALL IN ALL:

- FIRST I WANT TO SAY I LOVE ASPEC! i am not trying to down the 500r in any way... just giving an honest comparison from the cars i have done.

- they are similar and you honestly can't go wrong either way. if your looking at buying a whole kit then the same can still be said. i love greddy's turbo manifold on this setup, but A-specs manifold is super as well + they have that lifetime warranty on it.

-A-spec has great support and are here in america. they are great guys and are very willing to help out and work with you on custom setups. i just don't want people to bash the T78 when it truly is a great performing turbo. sorry this is so long :)

I need to copy that into my for sale thread...

I think that many companies have good turbos, but the results on the dyno will vary due to so many different factors.

Porting varies from engine builder to engine builder, tuning, intercooler size, exhuast size, etc. All these play key roles in the amount of power you would put down on the dyno.

I think the t-78 is a good street turbo, and it will put down lots of power. The 500r is also a good street turbo, I guess it comes down to your own preference.

Plus whats the goal for power? Personally, I am going for the 650whp range so I am sticking with my modified greddy t-88. But if your going for 400-500whp max, well then you obviously want a smaller turbo, it only makes sense.

you hit it on the money Oly. there really are waaaay too many factors involved.. even down to altitude and hell not every dyno is going to be perfectly calibrated to each rx7 that rolls up there :(

as i said, like you did, it just boils down to personal preference... if you really do need that little extra spool up then go for the 500r. that car actually returned to us for a small idle issue and i got to drive it again.. and immediately took out a t78 car here and had a good mind refresh.

i'll take back my earlier post just a tad... the 500r will make the 15psi faster, probably by about 4 - 500rpms but both will fly to whatever boost you need once it gets in that range within a heart beat.

again, the a-spec kit is great.. if you have found a good deal on a T78 tho and that being your main reason for asking then don't be afraid to get it. it's VERY VERY streetable :)

Lets not turn this into another pissing match shall we, I have seen them running anywhere from 436-448@15-17lbs, none of those cars that I know of are running the multiple ignition boxes the Broken09 has on his car, none of them are running the 1.06 housing, that I'm aware of, and none of them are running the full 4"exhaust with open wastegate. Combine that with porting, timing, and IC and who knows how far the difference can be. You know this. You can not fudge numbers on a dynojet that is the main reason I bought it. That way I don't have to hear people think I fudged the settings as you can on the inputs of other dynos. I do not give out or guarantee #'s never have, never will. I post up our results that we get and I let people know theirs will vary. I have some customers put out better numbers than we have I have some that put out much less than we have also. You know as well as I do that because "X" put down so much hp doesn't mean everyone else will.

Holy crap! Blast from the past!! What numbers claimed? Where? Your an idiot if you think I can fudge the numbers on "MY DYNOJET." T-78's are no more proven than any other turbo out there. It shows nothing but stupidity on your part to think that HP is a function of turbo alone. Funny how you don't seem to mention both Ralph or Ernies kits. Ralph got 681whp last I talked with him, and Ernie is pulling 643whp. Both on A-spec kits thank you. Or what about TrentO on here who is getting 470whp@17lbs on my 35RT4. I get so tired of people blaming "x" product for what could be any number of factors. As "Jason" also said "Although there are other variables that play into that like engine porting etc.." spoken like someone who may actually know a little more than some about what's involved.

-S-

Interesting to note that there are three different shop owners in this thread running A-spec kits ;-)

Who is the third owner?

This thread just got more interesting. Some people don't seem to realize that it's all give and take, larger comp/turbine wheel vs smaller, ball vs journal bearing.

I used to always argue with idiots who couldn't understand that the BNRs were more efficient than stock twins, despite being a full 20% bigger in the shaft, comp and turbine wheel......

Xessive, Rotorsports, and You used to be were you not?

Still am :)

crap, please don't anyone think i was bashing on the 500r kit. as said it's a wonderful kit.. my only purpose for doing a comparison is because the original question was if the t78 is streetable and since everyone was mentioning the 500r i just figured i'd give some examples.

i am always quick to tell our customers that A-spec kits are fuggin great :) we're installing another 500r kit within the next couple weeks and have another fella about to get one.

and just for the hell of it; i'll mention that we found a bad boost leak/ vac leak within the throttlebody of the 500r fd that returned. got that sorted out and i turned up the wick just a little ;) i'll just say this for now... the turbo is starting to show it's true face.... me likey :D

i also believe we may be getting a-specs bad ass 3 rotor exhaust manifold... :ky: sorry that has nothing to do with anything haha

very fun at 25 lbs a little old fanished tho.. some lag