i don't know what to buy

i stocked between 15gs and dr 650.15gs are $700 cheaper but they make less HP.i have plan to but 460 to 470 hp to the wheels on race gas or boost cooler.what do you guys recommend me to buy?

15G's and DR650's are very close to each other.

Very easily answered.
Only get DR650s if you are
A) planning on taking it to the track more often then 2 times a year
B) absolutely serious about running race gas ALL the time

For the extra money, DR650s aren't worth it, unless you will be pushing them past 20psi.

Stop focusing on numbers, because throwing on a turbo wont get you there, it's all about the supporting mods and tune. Focus on what turbo setup will suit you, and BE REALISTIC. I would love DR650s, hell I'd love DR1200s, but I know I simply don't go to the track enough to make use of them, I don't have the money to constantly be running race gas, and I don't even have the money for them. I know I don't want a 10sec daily driver. So I'm going with 13Ts.

My best advice is go onto 3si. THere are literally about 30 good threads comparing 15Gs to DR650s. Go on and just read through all of them, and be honest with yourself and what you will really be able to put into the car.

Very easily answered.
Only get DR650s if you are
A) planning on taking it to the track more often then 2 times a year
B) absolutely serious about running race gas ALL the time

For the extra money, DR650s aren't worth it, unless you will be pushing them past 20psi.

Stop focusing on numbers, because throwing on a turbo wont get you there, it's all about the supporting mods and tune. Focus on what turbo setup will suit you, and BE REALISTIC. I would love DR650s, hell I'd love DR1200s, but I know I simply don't go to the track enough to make use of them, I don't have the money to constantly be running race gas, and I don't even have the money for them. I know I don't want a 10sec daily driver. So I'm going with 13Ts.

My best advice is go onto 3si. THere are literally about 30 good threads comparing 15Gs to DR650s. Go on and just read through all of them, and be honest with yourself and what you will really be able to put into the car.
what do you mean by suporting mods?what are suporting mods?how much is max safe boost on our car with 15gs?

I would recommend you do some research on mods before you just throw on some turbos. Igo is totally right. go to www.3si.org and on the main page on the right hand side is a list of suggested mods and power upgrades in order to make the most of your car.

Supporting mods as in downpipe, intercooler, injectors, pump,clutch engine managmenet system, and engine internals required to run such boost.

Trust me go for the 15gs and run the pump gas, I run race gas all the time since my car even at low boost runs badly on pump. depends on what you're looking to build I guess.

What are your current mods????

best to start of with all of the basic supporting mods.

i have 550cc injectors ,255 fuel pump,dow pipe,no cat,3 inches exhouse with apexi muffler,FMIC,S-AFC.

oh i have hks ssqv BOV too.i will buy EBC and boost cooler soon.

i have 550cc injectors ,255 fuel pump,dow pipe,no cat,3 inches exhouse with apexi muffler,FMIC,S-AFC.

stick with 15G's, you will need bigger fuel injectors to run DR650r's to "above 15G potential"

i remember that dynamic racing guy told me our engine can hold 30psi with race gas and boost cooler.i don't want to run 30psi ,but i was thinking to run 25psi when i race.i don't race that much.

DR500's with DR Stage 3 heads, 660cc injectors.

i remember that dynamic racing guy told me our engine can hold 30psi with race gas and boost cooler.i don't want to run 30psi ,but i was thinking to run 25psi when i race.i don't race that much.


I don't mean to be a prick when I say this, but please take it seriously. 25psi is not easily obtained. Just because some people can run 30psi, doesn't mean many do. Yes the stock internals have been proven to take it, but that is with thousands invested into the proper supporting mods, and a very knowledgable person doing the tuning. Judging by the posts you have recently made, I really don't think you are up to this. As well, 25psi cars generally aren't the most streetable cars, as they tend to break parts often. At 25psi you are talking low-11s, possibly 10s. Realize this is the kind of times a freaking Ferrari Enzo can put down.

I realize when you first get into modding, everyone wants to go big. But the reality is, few have the knowledge or the funds to do so.
Before you go wasting alot of money on alot of stuff, that you may or may not need, I again suggest that you get serious with yourself regarding your goals, your funds, and your abilities. And I also suggest you go on 3si, and read as much as you possibly can.
Read teh comparison threads on turbos. Read other people's answers on there to similar questions. Read the threads on people's cars like Adam's and Trevor's and Chris(IPO), and Ray's, and Mellon's, and the few dozen other guys who have high-hp cars, and see what issues they encounter, and how much time, and money, and troubleshooting really goes into owning one of these cars. If you still want to after all that, then go for it, more power to you, it's your time and money...but I just think you maybe being a bit unrealistic with yourself.

DR500's with DR Stage 3 heads, 660cc injectors.


Those injectors are overkill for those turbos, and you would also need timing control with anything over 550cc

and you would also need timing control with anything over 550cc

Only if you are running pump. And if you want to run pump gas, the bigger the turbo the better, as long as the engine can spool it within reason.

a single t3 turbo kit makes more power or 15gs?

I believe so. Depending on the setup, I've heard rumors of the T3's pushing over 700whp.

I believe so. Depending on the setup, I've heard rumors of the T3's pushing over 700whp.
maybe that was twin t3 turbos not only one turbo.

what do you guys think about this turbo kit?if it makes more power than 15gs i would buy this kit.
http://www.3si.org/forum/showthread.php?t=263717&page=1&pp=10