Single T or TT

[SkylineUSA]

You also have to remember that singles are about 2-3% more effecient over twins as well.

[GT500916]

Originally Posted by SkylineUSA

You also have to remember that singles are about 2-3% more effecient over twins as well.

how so?

[viet_boiiiii]

who said eclipse with stock turbo dont last that long? its not true... i've been abusing my eclipse since i bought it (2 months ago when it was about 104k) now its at 107k miles.. turbo still spools strong and fast. Im gonna have Mitsu replace everything in need to make my engine last for another 2-4 years during late jan or early feb 05

[SkylineUSA]

Originally Posted by GT500916

how so?

I stand corrected.

You know, it really sucks when you see something posted some where on another site, and take it for gosple. I saw that singles were more efficient on one of the Skyline sites I go to.

Well, I should have picked up my Corkey Bell book, and read up on it again, my bad.

Yes, twins are more efficient.

[flyinMKIV]

It's not really a matter of efficiency, rather what is efficient for you. If you want to have a great 1/4 mile time, it can be done on a twin setup or a single setup. If you want high top end numbers, it can be done with both as well, it's just a matter of what you really want. Being into supras, I know that it's easier to do what I want to do on a single turbo setup rather than a twin turbo setup. It's really what you want to do. What do you want out of your car?

[SkylineUSA]

Right, matching the compressor map with the displacement, and rpm power band that you want out of the engine. But with that being said, it easier to spool two small turbos, than one big one.

I know you guys will go to the singles, so you can do away with the sequential. To tell you the truth, I don't recall seeing any Supras running big numbers with twins, I am sure they are out there

[GT500916]

Originally Posted by flyinMKIV

It's not really a matter of efficiency, rather what is efficient for you. If you want to have a great 1/4 mile time, it can be done on a twin setup or a single setup. If you want high top end numbers, it can be done with both as well, it's just a matter of what you really want. Being into supras, I know that it's easier to do what I want to do on a single turbo setup rather than a twin turbo setup. It's really what you want to do. What do you want out of your car?

well i dont want a car that will go through the 1/4 without lagging from start and without toping out at higher RPMs.. its picking the right side for less lag and for top end thats sometimes a hastle so from what i heard is on a TT turbo set up the smaller turbo spools fast from start and then it goes into the secondary bigger turbo to keep the power coming at the higher RPMs without toping out, so it seems like the TT would be more efficient for a 1/4 or stop light to stop light races because it would have less lag, but if i was to go for the speed i would definetely go with the huge turbo and build up my engine in and out to spool up that huge turbo faster and and then engine being strong enough to keep up with the huge turbo after it start spooling...

you are right its all about what you want.. and nobody wants turbo LAG or toping off at 5k either... it seems impossible to get both sometimes out of one turbo thats why TT sound sbetter for delivering both.. no lag and doesnt top out because its supported byt a bigger secondary...

i never got into TT yet, still have lots to learn about single Ts and the sizer and trims and all that stuff, but every time i ask and read and look into it more i get more info... thanks guys

[flyinMKIV]

To run an optimal drag race, you should never have to leave third gear and you should befinishing the quater mile at the same time your hitting red line.

The thing about twin turbo setups on supras is that it's just plain flat out a pain in the ass to fix when something on it goes wrong, too many vacum wires to check, my single turbo only has 3 or 4, not too much time is spent on diagnosing the problem. Running a small aftermarket turbo is sounding like what you want. Run twin T-28's and you should be fine

[GT500916]

Originally Posted by flyinMKIV

To run an optimal drag race, you should never have to leave third gear and you should befinishing the quater mile at the same time your hitting red line.

The thing about twin turbo setups on supras is that it's just plain flat out a pain in the ass to fix when something on it goes wrong, too many vacum wires to check, my single turbo only has 3 or 4, not too much time is spent on diagnosing the problem. Running a small aftermarket turbo is sounding like what you want. Run twin T-28's and you should be fine

thanks... what turbo u running and u go the 1/4 minle and whats your hp ans what upgrdes u have if u dont mind me asking... thx

[flyinMKIV]

My new setup that is being built at the moment and is projecting mid to high 11's. I have seen plenty of my friends who drive supras break carbon fiber drive shafts completely in half which is way too much power, and the sad thing is is that they never broke past 12 seconds at the track. It honestly depends on what you want to do with your car. There are a few cars out there that can compete in just about every type of car event. But the owners have invested a lot of time and money in their cars. I decided not to go that route quite yet, rather just be a good 1/4 mile and interstate car. I have several turbos which throws my setup around on people because they never know what I'm tuned for. Best way to make money in my oppinion. But if you want your car to be a good all around car, check out several different sites about turbos and do your research. Taking someone else's setup is not bad but it's still not exactly what you want your car to do, it's what other people wanted their cars to do. Do your research and when you've made a decision, we'll all be more than happy to help you with it. Good luck bro.

[SkylineUSA]

Its one thing to have 700hp, but its totally different to having a usable 700hp. IMHO you want a nice broad power band, I guess the Supra guys have leanred form the past mistakes when it comes to this. I mean, I have seen a lot of the older Supras running 700-800hp, but it was not usable because of how the power came on, all of sudden. That is the biggest problem with big singles.

[GT500916]

i dont think i want a crazy power supra here in Cali then ill never pass Smog , and that is why im getting a supra because they are stock with turbos and run nice HP and pass smog with no prob...

so im limited to what i can do, i do know greddy probably makes a upgrade turbo kits for the supras that are Carb legal so that can be my second option, my first option would be to rebuild the engine depending on how many miles the car would have and how good it runs when i get it.

I was thinking maybe just rebuilding the engine with stock parts but new parts, like rings and bearings and ill be good for another some 10 years or so with stock power... or im thinking if im gonna be taking the engine apart i might as well upgrade to stronger rods and pistons while keeping the same 9.5 compression... (i dont remember the stock compression)

since the stock engine can hold up to some 800hp with bolt ons i dont really see a point of replacing the internals with stronger parts because i dont see myself running 800hp haha.. probably 500hp is the most i would do

so my question would be is, since im not looking for crazy HP would it be better for me to just replace the rings and bearings and possibly head bolts and rod bolts and crank bearing and keeping the engine stock parts..or might as well upgrade the internals to the next step up from stock?

a bore might have to be done depending on the cylinder walls, but i dont know if i want to go through all the trouble of pulling the engine out, i would just rebuild the engine while its in the car... i have done that on a few cars, dont know how hard it would be in a supra, but it wasnt that bad in other cars..

[GT500916]

im not going to be picky if the supra ill get is a single T or a TT so ill pretty much be stuck with which ever one i get... and ill probably keep the turbos stock, or get them rebuild or just get a new pair of new ones that are the same size about as stock, maybe slightly bigger... se i cant do huge turbos because im in Cali so smog regulations suck here.. but ill worry about all that once i get one... they are harder to find than i thought.