hey all well im at this again i was lookin into the 99 spec tubos but really like the t78 but i dont want all that lag, someone told me to go with the 99 spec and that i should be able to get about 380 to 405 on 15 psi is this true

 

the 99 spec turbo's are alot more efficent than the 93-95 ones, but if you want really high #'s i would go T78, if you want near stock lag go 99, but then again you could run the 99 in non-sec and do around 400


another choise is dual T28's..but whatever you can afford

 

I would go with the 99 spec turbos..if the choice is between those 2 only because you will get a lot of lag with the t-78 now if you go with a 60-1 or 62-1 then I would go single...

 

Get the BNR's stage 3 non-seq.

 

you want to go single but like 99 spec turbos...

get 99 spec turbos... Bolt on...

 

99 spec....little lag
T78, HUGE boost

 

id say the 99s. Bolt on.

 

Personally, i don't know very much with the turbo's and single set-ups and the 99 spec, but i do know that you can push more with the T-78.

 

I say t78 b/c all those hoses and crap that have to be connected to make the stock twins or even spec 99 twins is ridicoulous. If you go single you can remove all the crap hoses increase reliability and when something isnt boosting right you can limit it to just the turbo , exhaust leaks, etc. I mean yes lag is there then just run a shot of nitrous inside or port your engine =)

 

Thanks Guys That Helped Out Alot I Think Im Goingt O Go With The 99 Spec And Run Them Non Seq But If I Do That How Does It Work I Know That In Seq Form The First Turbo Is On The Then Sec Comes On Do Both Turbo Stay All The Time Thanks Again

 

Both spool at the same time its basically like having a single. There is a writeup on non seq. I say you should have gone t78 basically b/c people kill for single and the simplication of the single turbo setup and all you are doing is basically making a t60-1 turbo from seq's. I say port or shot of nitrous into turbo b/c not to jynx you or anything this is a rotary by the time ti blows you can just spend the extra money to port and power the t78 . thats my 2 cents

 

just go to www.gothamracing.com and call up. Ask to speak to either Alex or Steve. Tell em that Chris from Jersey referred you.

 

Sure, and like the price is going to be any difference!!

 

A. The '99 twins are not far more efficient than the '93-'95 twins. Unless you can get an excellent price on them and need new turbos anyway, save your money and buy a set of U.S. twins in good condition or have them rebuilt.

B. Non-sequential twins are not like a single turbo. It spools a little more slowly than the stock sequential system, with the benefit of making more midrange power and increasing reliability by eliminating a lot of the hoses and solenoids. With the gates removed and with the exhaust manifold ported, it is possible to make a little more peak power, but basically you're limited to the same power levels as the stock sequential system. You absolutely must eliminate your catalytic converters if you haven't already done so, or boost response will be sluggish.

C. If you're looking for more performance from twin turbos, look into the BNR upgraded twins. There's a considerable amount of information on the forum on them already.

D. The T-78 isn't the only single turbo kit on the market. There are many smaller "street" single turbo kits available that have better drivability.

E. A single turbo is definitely going to require considerable tuning, probably require an aftermarket ECU, fuel upgrades, etc. In other words, additional costs. It's not plug-n-play, and it's not cheap. If you want more info, spend some time in the single turbo forum. That's what it's there for.

 

HEY jimlab thank for the info very very imformaable ill look in tot he bnr twins i just was to beat those damn c5 there 7 in my complex lol

 

If you consider to go single and don't worry much about little lag, G35/40 turbo is an excellent choice in my opinion. However, like Jimlab said, when you want to convert to single, there are lot of "other" parts need to upgrade in order to run reliable in which you'll need to prepare shell out lot of money to make it right. I would say if you have the money go for single, if not, stay with the twin.

 

you should be able to kill c5 corvettes on the stock sequential set. But my preferance is and always will be single turbo. Lag is soooo overrated. The t78 is an excellent choice for a balanced street car and drag car.

 

If I were you maybe convert to non-sequential, nice hard pull to redline, but it's like a single turbo, you have to deal with the lag.

 

I'd go with a single turbo over a set of twins. The stock twins are teh sux0r. If I bought another rotary powered FD, they'd be about the first thing to go. I learned to hate them.

I personally like the Greddy t78 kit but if you want spool closer to that of the stock twins you'll have to compromise for something smaller. A GT3540 or a 62-1 with a .85 A/R would probably be more "streetable" and have a goodbit more potential over a stock twins setup. The Apexi kit or the XS T04e kit will spool faster and are good for about 390-400rwhp. Ask a few questions in the Single Turbo area.

Do you have a power fc? If so, a cheap fuel system could consist of installing a walbro 255 fuel pump and having your 850's reworked to 1300's by RC. You'll obviously need tuning as jim has mentioned.

 

I had a t-78 with a GT79 compressor wheel. Spooled by 3800-3900..

Non-sequentials came on at about 3500.

 

t78 sucks

 

I intend to make a custom twin kit with GT25's, ball-bearing turbos spool much faster than regular ones so I will be able to get a considerable performance upgrade over the range and maintain a good turbo response.

~Kris

 

I had full boost (14-15 psi) by ~3,200 rpm in my car. I'll have to ask my friend what he sees, since his R2 is basically set up now just like mine was, except with an ASP medium IC instead of large. The other non-sequential R1 I drove fairly regularly which had almost identical mods also made full boost by about 3,200. All three had the pre-control gate completely removed and exhaust manifold ported, and no catalytic converters.

I think that 3,500 rpm figure came from someone who still had at least one of their catalytic converters, or did the "poor man's" non-sequential conversion which leaves the internal gates in place. And possibly had an automatic transmission too.

 

Yep. You don't even need 300 rwhp to beat a stock C5. That is easily attainable with the stock twins.

 

See I Have a single td06 turbo which is very streetable I spool at 2k and I dont even have a full system ... Its all stock.... Only thing I think it really needed was a fmic I dunno how you could do the single turbo setup on a stock ic lol.