A few questions on the T78,

Boost characteristics? Full boost by 4,000 rpm?

Is 450 rwhp@15 psi the norm?

What about the install? Did it bolt right up? Any custom fab. when using the Greddy 3-row fmic?

One last thing, I heard there are different types of T78's, is this true?

If so what are they, and do they have bb ones?



Big thanks https://www.nopistons.com/forums/pub...IR#>/boink.gif

damn wheres Vosko?He has one on his FD and it looks like a good fit.I never heard of two different T78's tho.

Custom work is only to get your DP to fit past your EGR valve...you will block it off and then either dent your DP or shave your LIM to make it fit. I have never heard of two different T78's, not from Greddy at least so if you want a Greddy kit, BB is not an option.

my LIM had to be shaved slightly. which is no big deal. with proper porting and tuning you should be able to make 450rwhp @ 15psi. i am trying to . we will see SOON. maybe i'll even dyno the car today https://www.nopistons.com/forums/pub...DIR#>/wink.png



there are four different T78's



http://www.trust-power.com/02greddy/turbine.html



i have the T78 - 33D -17.0 CM^2



i get full boost by 4k rpm

the 33D is the wheel and the 17.0CM is the exhaust housing

You sure you don't have the 24cm housing?? Cause my 17cm housing looks smaller than yours.

On a stock motor 400hp is reasonable. If you have Vosko's engine well that's another story! You can acquire a 95 and up LIM which doesn't have the EGR and clears the downpipe. GReddy really only sells one T78 in the US although there are different exhaust housing sizes available. You start making serious boost by 4K.



No custom fabrication is needed with either the two row or the three row as long as they're ordered with the single turbo piping kit (comes with it) but you can also buy both FMIC kits with piping for the stock twins too.

Michel

Keep in mind that almost all single turbo's from small to large all make very similar horsepower at 15psi on a street car. Porting and engine quality play a role, but typically you will see anywhere from 380rwhp on a small turbo to 435rwhp on a large turbo @15psi on pump gas. Its after 15psi when you begin to get into the effiency zone of these "larger" turbo's that the power really begins to show up. I would except to see rougly 425rwhp on a t-78 @15psi with the power more toward 500rwhp @20psi.

Keep in mind that almost all single turbo's from small to large all make very similar horsepower at 15psi on a street car. Porting and engine quality play a role, but typically you will see anywhere from 380rwhp on a small turbo to 435rwhp on a large turbo @15psi on pump gas. Its after 15psi when you begin to get into the effiency zone of these "larger" turbo's that the power really begins to show up. I would except to see rougly 425rwhp on a t-78 @15psi with the power more toward 500rwhp @20psi. [/quote]

Yes a lot of people don't relize this, I don't understand why people buy such big ass turbos and don't use them in their most efficient psi ranges, seems like a waste of money to me.

I think a lot of it has to do with the bragging rights. With some of these newer turbos like the gt35/40 with the use of ball bearings to help with spool, you may begin to see larger turbo's used more often. Turbo's like the greddy t-88 and hks t51 are defenitly overkill and a waste of powerband for a street car. You hear a lot of mixed feelings about the t-78, some don't mind the extra lag others hate it. Personally lag isn't that important to me, however the t-78 still seems a little large to me. I'll trade the 500-600hp potential for a little extra power 500rpms quicker with a smaller turbo.

It's so true...for me it was a matter of getting what I thought was a good deal on a T78 kit. Turns out the turbo was ba and I ended up upgrading it to the GT79 compressor. That compressor, according to Majestic, outflows the T78 psi for psi, even in the lower rev range. Dunno. If I had my choice, I'd go GT3540 or with something from Innovative that spools a bit quicker. On the plus side, this turbo should do quite well when I slide a three rotor in :-)

Michel

Will that gt79 keep up with a 3 rotor? Do you need to swap out any internals for it to flow enough exhaust you think?

I'd go with one of the innovative turbos if I had the money. T66 or T70 dual BB, hell yeah

If I go with the T78, or whatever I upgrade to,

Is the tranny an issue?

How many have you broken? Vosko? Anyone?

The stock tranny is very strong, can hold a good 600hp from what i've heard.

a rebuilt tranny should last a while with care. if you don't drive like me https://www.nopistons.com/forums/pub...DIR#>/wink.png

What about the motor? (with proper tuning)

I can't buy a motor every year (or a tranny)

I know it wouldn't last 10 years, but what is average for 15-18 psi?



I'll be honest, I'm deployed, sold my Camaro before I left,

and am buying something when I get home.

Love FD's, but am worried about reliability issues with more power.

I understand rotaries don't generally last as long, but I am not rich.

Just looking at my options when I get the time, internet is hard to get to here,

but when I get on I usually am reading about 7's.

Pro's, Cons and any advice on FD's or other cars are welcome.

It really just comes down to doing things correctly and not taking any shortcuts. Good solid tuning is part of that equation. In my case, I'm about to rebuild a hurt motor. The only reason the motor is hurt is because of my stupidity. I did a few things wrong when I converted to a single turbo (and I knew I was doing it wrong at the time) and it ended up biting me in the ass https://www.nopistons.com/forums/pub...DIR#>/ohmy.png The most glaring mistake was not putting a filter on the end of the turbo. I live in Florida. Home of sand and sunshine. Most importantly, the home of sand and lots of it. Ingested a bit and that's all she wrote...car still runs fine which has given me time to tear apart a used engine and rebuild it (with the help of this list!). Thing is, I would be turning 68,000 miles here shortly, having made 340 rwhp or greater most of the engine's life. I went mod crazy after purchasing the car but I did everything correctly including all of the "safety" mods. Most importantly, I had the "basics" such as a fully programmable computer, the fuel system, etc., the less glamourous stuff in place before doing the big hp mods. And I made sure it was tuned correctly and safely along the way. It's not a car you can ham fist mod and get away with it though. Hope that helps a bit. Oh, and it also helps to acquire an FD in good shape mechanically, something that's getting harder and harder to do.

If you tune properly, good air/fuels keeping them on the safe side of 11:1 or even as rich as 10:5:1, with the timing down to 15 or 14 degrees in the 15-18psi range you will be fine. I have been running 18psi on pump 93 for a good 2 years now and put on over 20k miles, its also my daily driver. Tuning is the most important part, make sure you know for sure what all your settings are and consult the forum for approval or advice.



My tranny was brand new when i bought the car 3 years ago and is still in good shape, other than shifting from 1st to 2nd is starting to get a little grindy after a few bad mis-shifts, but its not bad at all. Have you thought about what fuel management setup you are going to go with?

Yup good tuniing an not alot of abuse it willl last ....i know cars that have over 75 passes on tranny an motor with nitro an still runnig strong...an thats 10 sec passes ...greddy -T-78 ported engine ...an works fine...some engine are built better than others.....its has alot to do with how the engine was built an maintance to motor an tranny.... LMAO.... most important your driven....not like VOSKO he drive like he stole the car or on a cop chase.... https://www.nopistons.com/forums/pub...IR#>/wacko.png

As far as EMS 94Tour, I like AEM.

I am down to 3 cars, I think. 93/94 FD, 94/96 R/T TT (Stealth), 98+ Trans Am (LS1),



I like the 7 cause it is small and nimble, R/T cause of AWD, and Firechicken for it's brute power and ease of

hitting 11's. I am not a import/domestic hater, I like what I like, who cares where it is from?

7's and R/T's are rare where I live and Chickens arn't. I want to work toward 11's when I get home.



I am just pissed I am missing opening weekend at the dragstrip, second year in a row

(I was gone last year too), just wish we could hurry up and kick Saddam's ass so I can go ****** home!

I could be driving! https://www.nopistons.com/forums/pub..._DIR#>/dry.png



Please give me comments/opinions on the cars I am thinking about, raced either of them, anyone?

sorry about the questions, more for the kills/other cars section, thanks to everyone for their posts.

Forget the Stealth. Too heavy and too much money to get them into the 11's on a consistent basis. Firechicken, yup, every high school kid has one. Fast for the money, easy to make faster on spray, not very sophisticated and a GM product. Some complain about the FD's build quality but I've never been impressed with GM stuff. I'm biased. Go for the 7!

Michel

AEM has a nice computer setup for the FD, but I haven't seen anyone who has actually used it yet. So getting help setting it up and changing things may be difficult. You may find a Apexi Power FC with datalog kit or Haltech better choices. You will be able to get much more online help from rx7 guys.