BlkTegOn18s

iTrader: (3)

t70
0.70 A/R Compressor, 0.96 A/R Turbine
Compressor Wheel 61mm/ 91mm
Turbine Wheel 62mm / 74.7mm

T57
Compressor .50 A.R., Turbine .63 A.R.
Compressor wheel 50.50mm /76.20mm
Turbine wheel 56.00mm/ 65.04mm

T4
COMPRESSOR .70 AR TURBINE .68 AR
COMPRESSOR WHEEL 57.89 /72.95
TURBINE WHEEL 54.47 /83.16

On a 85mm 9.5:1 b20vtec full port n polished head thats been milled and completely built.

Ryank327

Depends on what kind of power and spool you are looking for.

kreatekustomz

the t57 will spool much faster but make less power yet the T70 will make much more power but spool later. If it was me I would lean more to the T70 for the motor you are running...

TheShodan

iTrader: (14)

Power goal? Mission? More info to get info.

BlkTegOn18s

iTrader: (3)

well power goal really isnt what i have set cause how much power doesnt matter to me i just want to have a setup that is pretty much complimentary in all aspects (ie you wouldnt put a t25 on a built supra). as far as the motor size is concerned do you think i would be more logical to go with a 57 trim or t70. i have a 7lb flywheel on a gsr tranny im not plannin on a real big lag time it will get out its own way!

marcj

is this for driving on the street or only strip? you're comparing two turbos with completely different attributes. T70 is going to be a dr. jeckle 'n mr. hyde turbo. 57 trim will spool around 3k rpm which is within your daily driving range.. you decide.

BlkTegOn18s

iTrader: (3)

Well i drive on the interstate 70miles one way to work and im not really trying to go boosting around town i'll strip it for race purposes. i mean on the street i'll be running from a dig only anyways!

marcj

if its a street car, go 57 trim.

BlkTegOn18s

iTrader: (3)

ok any other inputs

BlkTegOn18s

iTrader: (3)

i have decided to run a t4 .70compressor .68 turbine

fast2camciv

i wouldnt put the 57 trim on it. fast spool also equals big traction problems. i had the t70 on a semi-built 81.5mm gsr motor and loved it. spool wasnt that bad at all (made 23psi by 6k) remember lag on a street going honda equals traction control

TheShodan

iTrader: (14)

Interesting thought process..

93CX

If you're trying to pick between eBay turbos, if I recall correctly the 57 and T70 have almost the same wheel size with different housings. I use the 57 trim and love it.

fast2camciv

on a street car i find that true...are you disagreeing or do you have more to add?

whats going to be faster....the car that has fast spool and makes full boost by 4500 rpms, and spins...or the car that doesnt make spools slow, and makes full boost at 6k?

i know once the turbo is spooled and your bangin the gears, both setups are equal. but the OP says he wants to race from a dig on the street...

the t70 is a 61mm turbo, its exactly the same size as a gt35r (and all your other run of the mill 61mm turbo's) the 57trim is smaller. i have ran both of these turbo's myself.

BlkTegOn18s

iTrader: (3)

any other inputs?

BlkTegOn18s

iTrader: (3)

HEY WHAT ABOUT THIS TURBO...
COMPRESSOR
.70 AR

TURBINE
.68 AR

COMPRESSOR WHEEL
57.89 /72.95

TURBINE WHEEL
54.47 /83.16

BlkTegOn18s

iTrader: (3)

added another turbo what about this one^^^

TheShodan

iTrader: (14)

I have to say unfortunately I disagree with the entire logical reasoning that is used of "which would be faster"..(We all know that is a relative term, but I understand your context). Perhaps its the way some of you guys are driving, "from a dig" or whatever that seems to give your reasoning as to why one would think that the "Big turbo" has better traction some merit . Simply because you are able to retain traction from the car in a lower rpm of the power-band doesn't mean that its going to help KEEP that traction throughout the rest of the rpm range under full load. This is what typically occurs with the car that has the much larger turbo when it reaches the higher rpm part of its range and reacts like a "light switch".

With this comparison of the 2 types of turbochargers, I have found over the years that the smaller turbo that has the broader torque-band is able to keep a better record of traction against the person who uses these larger turbos that act like a "light switch". While the larger CFM turbo attempts to gain control of the car when boost reaches peak efficiency with a low torque-band (due to the smaller displacement of our engines), the smaller, broader-banded turbocharged car is already far ahead, because the driver was able to control the power-band more quickly and take advantage of reaching and holding peak torque more effectively. In the meantime, yes, the much bigger CFM turbo catches up to pass the other car eventually, but by then the race is over most of the time, unless the car is some "highway monster" that the owner planned it to be.

I've own both types on FWD honda turbo applications as well, and I have to say that unless you don't know how to control that foot in conjunction with other traction assisting devices, that big turbocharged application on the street will always fight for a BIT more control, than the one with a more gradual broader torque-band.

Perfect example is Tony the Tiger's GT2871R and the broad powerband that is used.

BlkTegOn18s

iTrader: (3)

i understand what you mean instead of my power just exploding in at 6500-7500 i will want to make power at 3-4 where i can control the power an still be able to pull on top end giving me links before they large turbo can pull back up on me!

TheShodan

iTrader: (14)

^^Yep.. ;-)

fast2camciv

i disagree....instead of peddling the car with the tires spinning from 4k until redline, or half throttling the 1st 2 gears... (both of which are slowing you down) you are dealing with the gradual increase of boost and on coming power (spool) of the big turbo. i guess i dont know what you mean by "light switch" boost. i havent run a turbo yet that was like that. larger turbo's generally spool really slow...so from 3k you have 1-2psi....4k 3-4psi....5k 5-7psi...6k 7-15, 20 whatever psi....i suppose you can say that at 6k its like a "light switch" because the turbo finally comes online and goes from 7-8psi to 15psi real quick.

IF ANYTHING i would say a fast spooling turbo is more like a "light switch" because it goes from zero boost to full boost very fast, and very early in the power band. you dont get the added benefit of the slow "ramping" of power like you do with the large turbo.

idk, i guess i just race differently. on the street im usually behind, and then freight train the last half. on the street, hard as you may try, its really difficult to put down power early in the power band, (or in the lower gears) and make really good power and then have it rev all the way out. i have yet to build/tune a honda that is capable of that.

IMO the old saying of "lag is like traction control" really describes big boost honda street cars. instead of spining right away and trying to control the spin (where your losing ground) im using the slow onset of boost as steady forward motion.

and besides, who said you cant pedal or half throttle a big turbo when it starts to have that "light switch" effect.....

idk, to each his own i suppose.

fast2camciv

its really 2 different schools of thought.....there is no right or wrong.

while your spining and trying to control that power....im spooling, steadily gaining speed and keeping traction the entire way...i still have to pedal control the power when it comes on. but instead im doing it from 6k-9k where your doing it from 3k-7k. its much harder to spin a tire doing 80mph than it is doing 30mph

TheShodan

iTrader: (14)

If the power of the car is that overwhelming, it is VERY easy to spin that tire at 80mph, (its been done).

half throttle in gears 1 & 2 may slow YOU down, but those gears were not meant to have full boost on a FWD application to begin with. You're keeping traction at that point.

To each his own, I'm simply using my experience and those that drive professionally and their feedback from the turbos I've made for them.

BlkTegOn18s

iTrader: (3)

i have built big turbo civics and small turbo civics.
they both feel good but on the street from a dig the small turbos spinning problem is ridiculous yes but the large turbo once it lights still has to play catch up a GOOD bit. thats why i honestly have the thread to determine what turbo will be the best for my application. so i wont be too big or too small but where i need to be!

Block
Darton Sleeved GSR
85mm manley pistons 9:1
Eagle H-beams
Ls Crank

Head
Port and Polished Gsr Head
Ferrea valves
JGE Valetrain
Stock 96+ Gsr cams
Bdl cam gears
Edelbrock Victor X manifold
75 mm Throttle Body

Turbo
LoveFab Custom Top Mount
???? turbo
3"vband 4in downpipe
44mm wastegate
greddy rs BOV

Fuel
Walbro 255
STR Fuel Rail
RC 650's

DriveTrain
JDM GSR with LSD
7lb flywheel
ACT stage 2 clutch

AJxr

im not talking **** or making fun here but was it an ebay t70? a friend of mine has an ebay t70 for sale, t3 flanged, split .82ar hotside i believe brand new for cheap. though of running it on my built motor. any other info fast2camciv on the t70?