smg944

iTrader: (34)

im having an issue picking up the right turbo for my setup. i made 481whp on my last setup and it held power from 6-7800k above 450whp. im looking for responce almost the exact same and only want to gain 30-40whp total. i was running 22-23psi on a t3 1.06 35r. i tried seaching to see what a t4 35r would do for me but seems no one has run it on high boost. i plan on running the same boost level since i want to keep the torque numbers high. so far i have looked into a t4 35r, bw s362, and now looking into the billet 6265. i want to make sure i dont lose much responce and keep a flat powerband.

here is a pic of my dyno sheet.

smg944

iTrader: (34)

for boost responce i had 15psi by 4000 rpms. and transent responce was excellent. also want to extend my powerband to 8500rpms.

Trots*88TII-AE*

iTrader: (11)

A-Spec's GT3574 will likely be able to bring you over the hump, they're good for a little over 500whp, and the journal bearing one maintains similar response to a 35R, the BB version would likely give you even better response.

They are just a 35R with a larger, 74mm P-Trim exhaust wheel, and are T4. If you're looking for even more, look at the Precision 6265, same dimensions as the above turbo, but the compressor wheel is Billet aluminum and frees up even more power, and they will tell you that the exhaust wheel is even more efficient than the P-Trim. Likely good for 550whp or so with your setup, maybe more. Same response, but more expensive.

Send Sean from A-Spec a PM and get his opinion on it, he knows his ****.

rdahm

iTrader: (6)

out of curiosity, what causes your need for only a couple more hp? its an honorable goal IMO, just curious.

smg944

iTrader: (34)

yea i have been talking back and forth with sean on the 3574 and the 6265. it looks like it will be between those 2. definatly going to with a bb unit. just want to get similar responce and be able to gain a few hp while raising the powerband to 8500 or so.

my main reason for only going up 30-40whp is i like the spray pattern of the stock injectors for normal driving, so i am limited. i had 850s in there and i wasnt a fan. also maximizing a turbo as in putting it to its limit really wakes up the turbo for midrange power. at 450whp i was going down the track at 132mph. when i was at 481 it was probably around 134-135 or so. midrange power really makes the car run strong, basicly when you shift you lose no power.

rdahm

iTrader: (6)

an extra couple HP will give you that .003 seconds too :-)

I feel you on the injectors. im 550cc up front. I just dont want to mess with it.

WaachBack

iTrader: (21)

What was your 60ft when you ran the 11 flat? Are you looking for the extra power to break into the tens or something? You can get tens with your current setup.

Trots*88TII-AE*

iTrader: (11)

Looks like he's turned the boost up a couple psi since the 11.003 run, I'm sure he could run a 10.9xx as is.

smg944

iTrader: (34)

i ran a 1.68 60 ft. on the 11.003 run. i had ran an 11.10 with a 1.78 60 the run before. usually you cut .2 off for every .1 on the 60 ft. it would have been a 10 second run but my 3-4 shift was close to a half second. amature move, so i lost the time there. also i did make more power after i went to the track.

my main concern is trap speed. i went 132 on 450whp. with the 481 it was proably 134-135 or so. so with 510-520whp i should be able to get to 136-137mph. this is considering that i get 2k rpms of powerband. its not really the hp i am worried about thats why i only want a small jump in power. best way to do it is to use a turbo to its maximum.

ScorpionT

iTrader: (3)

If you are sure DBB is what you want, go with the billet 6265. As Trots said, similar in size to the 3574, but the compressor will flow more air and the turbine is enough to support 8500rpm, even on a nice street port.

mdpalmer

iTrader: (24)

What is your fuel/injector setup? Pretty insane trap speeds there, doesn't a Bugatti Veyron trap around 140 mph

smg944

iTrader: (34)

im am definatly going with a 3574 or the billet 6265. since i can get both in a bb option. my main concern with the 6265 is getting a 1.0 divided turbine housing. im working with sean at a-spec to get the setup. im shooting for the 6265 pending the turbine housing.

md, im running 550/1600's im at 85% inj duty at the 481whp level, but i do have some room in fuel pressure. so i will probably end up at 88-90% injector with an extra 5 psi of fuel pressure for the new setup.

veyron does 142mph i believe. i picked up a vbox gps unit. its a nice device and is super accurate. on 6speedonline there is a huge standings for 60-130mph since that is most roll race speeds and a good measure of power. the bugatti veyron goes 60-130 in 6.05 seconds. at 450whp i was doing it in 7.25, then at 481 i was down to 6.74. looking to get down to the low 6's after i am done with the new setup. the record holder was an automatic supra at 3.93 for quite some time, but the new record holder is a underground performance twin turbo garllardo at 3.53. that thing must be crazy to drive.

armytim2002

I see a lot of people talking about A-Spec. What about the 500R? Thats the one I was planning on getting. Im planning on about 500 hp, is the 6765 a better choice?

Damn thewird! We have the same pic (kinda) now im going to have to change!! lol

thewird

iTrader: (8)

The 500R-SP is a awesome turbo. It's what I'm currently running. The 6765 should make more power at high boost but it might not be as responsive. Nobody has tried the 6765 in a rotary yet which is why response is unknown so I might be the first lol. Maybe Sean could expand on the comparison better.

thewird

armytim2002

Just need to wait for the misses to let me buy it I heard it spools really quick (hence the SP part lol). Youll have to let us know which one you like better. Might help me change my mind

WaachBack

iTrader: (21)

Yeah, thats a crappy 60ft, you could hit around a 10.6 and a higher MPH with good driving (launching and shifting) and about a 1.5 60ft (which you should be able to get). Id just improve the 60ft and driving instead of sheeling about the cash for a new turbo thats almost the same size as your current one, unless you have money to throw away?

135 mph also requires you to have extra **** on your car at most tracks, like an external master power switch thats outside of the car, why would you want that?

G's 3rd Gen

iTrader: (11)

Derrick. What gear ratio you running. My car is now going to have 4.30 final. It should be done Monday or Tuesday. Back on the dyno next weekend to crank the t4 35r up w. race gas. G