Hi, sorry if that question has been on here a hundred times but I don't venture into the single turbo section all that often. I have a t78 waiting for install this upcomming spring but lately everyone has been saying that turbo is a lag monster and I will hate driving my car. I was wondering if anyone who has a t78 is actually dissappointed with it? Also for all you single t guys which turbo would you use if you were to start over again. I have been hearing the xs to4s makes as much if not more power than the t78 and spools faster. I would rather sell my turbo and buy a different one than use my t78 and not like it...obviously. thanks for any help. I know...do a search, right hahaha

 

Are you looking for excellent daily driver performance or drag strip??? Gmonsem has a T78 and says if it is tuned properly it is workable for the street. He also told me a couple a days ago that my config is the best he's seen for the street. Lots of low end power and next to no lag.

Check the dyno sheets on the xs site for the T04e/s and I think you will agree.

Ken 57 years young,
'94 white, pep, red leather,
mods: Street port and polished stage II, upgraded coolant seals,
Hurley 3mm racing apex seals, XS T04E Turbo Kit,
GReddy SMIC, Pettit ss resonated MP, Pettit ss cat-back,
RP Racing fuel pump, Aquamist 2s water injection kit,
under pulley kit(no air pump), Pettit short shifter kit, boost gauge,
AEM EMS, 3-bar MAP Sensor, Profec B(12-2?psi), 1600cc injectors,
LaBreck bushings, Evans coolant.
<http://nopistons.com/luv94rx7.html>

 

Thanks for the reply. That sure is an incredible setup you've got there. I hate to even ask you how much you've thrown into that project but I am dieing to know. Basically what I am looking for is a turbo I will love driving with everyday and still makes enough power that I will just about never lose in a race with other modified cars. I am happy with the power my car makes now for everyday driving but there are guys near me who can beat me and I don't like that. When I do eventually have my single or a different single installed I probably won't drive the car around with more than 10 lbs but I'd like to be able to turn it up to 18 or so and really stomp people. I have never driven any single setup before so I am a little worried about the lag with everyday driving. I've driven a t-76 supra and I thought the lag was well worth the power gains. I don't know if its the same with an rx.

 

Okay, I have loaded dyno curves into my CARTEST2000 drag simulation program. Because of all the low end power of the T04e kit when I did drag races against turbos with little low end power I beat them off the line. My lead was enouh to stay ahead till about 90mph and then the high end power blew by me. Did not beat me by much in the 1/4 mile. This program is very very accurate. Ari at RP uses NOS at the start because of the bad low end-power of his T78. Once he gets the power up there(probably 5krpms) he turns NOS off.

I have the same idea as you. I'll run 12psi on the street. But I can kick it to 20psi if I have the right fuel and blow just about anything off the road.

Ken

 

"my cartest2000 drag simulation program" haha that is ridiculous...I love it.

 

sorry to go off topic, but how do you get "car test 2000" to work?? i downloaded the demo and it would not install. are you running the demo or full version??

 

Do you have the Java runtime environment installed?

 

If you give me your e-mail address I'll send you the java stuff you need.

I'm running the prodution version. Best $$ I ever paid for a sw program.

Ken

 

Of the 1,000s of cars pre-loaded in this program I ran drags on many and they came out to be very accurate.
Z06 12.5 - 114mph is an example.

Ken

 

T51R KAI

 

LUV94RX7,

Where are your dyno charts? went to the site you listed and only found an exterior pic of your car?
Anyway I had a T78 on my car, its not bad, full boost comes on 4-4.5K. If your not planning to drag race and run over 20PSI you do not need a T78. A smaller turbo will spool faster and make the same power at lower boost levels. I switched to a Garret/Turbonetics T60-1, it hits full boost 12-13PSI at about 3.5K. at up to 16PSI it makes the same power as the T78 but spools about 800rpm sooner, I run on road race courses and this made a signifcant improvment for me. BTW I am selling the T78.

 

Good analysis. I was using dyno charts from the xs-engineering site(t04e/s). I also loaded dyno curves I found on the forum in the past on the T78. I think people get too wrapped up in dyno charts with the peak power and don't look at the power curve which to me is more important.

Ken

Ken

 

You can say that again!

 

I would have chosen something a little bit bigger than the apexi turbo. Although I can't complain about its power and now I feel more comforatable driving a car with more power. I probably would have killed myself by now if I had gone with something making insane power. I'll probably go custum turbo sooner or later, or maybe try the t04s.

 

its funny...everyone with a big turbo says they would probably go with something smaller...evryone with something like the rx6 says they'd like a little more power. I guess you can't win here huh? I actually might sell mine and go with the kkk stage 2. I saw ernie saying it spools faster than the t78 and definitely makes more power...what do you guys think about that one?

 

I think I'd like to see the dyno chart on Ernie's and check out the power curve. Ernie never had a T78. Went from twins to the KKK. Maybe he drove Gmonsen's T78.
As Gmonsen said it takes a lot of tuning to get big turbos to be streetable. He has put a lot into tuning his. Here again what are your needs. Drag strip performance or streetablity. I'd look for some feedback from Gmonsen before I ran out and swapped turbos.

Ken

 

There are many many parts that can change the way the car reacts.....way too many variables to just say one turbo is better than another. If you have a big single then you know you'll have a little give and take.....just like if you have a small single. It's all in the tuning and your particular setup. Everyone's will be a little different no matter how close they seem to be....you need to look at what you want it for and then add a little to that for expansion. You can't say that you'll really ever outgrow the power potential of a T78.....but you can say that about the smaller singles. I know many many Supra guys who sacrifice with a smaller turbo because they think about lag too much. Given about 3 or 4 months (sometimes sooner) they are already looking at going bigger. It's almost a given that you'll always want more.....but how many people do you know that want less?