Power potential between gt3076r and gt3071r both with t3 .63 ar hot side

[Scholzey]

ok ive been looking at the maps between turbos and reading what people have said about the turbos.

at the flow rates and pressures that i need, both compressors are within 5% or so efficency, so after intercooling there is virtually no difference.

the the gt3071r sounds like it will spool faster, but on the flip side, create less power per pound of boost.

now the reason to spool faster seems obvious to me, smaller wheel.

but the less power seems to evade me.

the only difference i noted is turbine rpm for the psi and flow that i need, and it seems that there is about a 5,000-10,000 rpm difference between the 2. would this account for the power potential difference? lower rpm means it needs less flow and more gas can be wastegated, there for lower back pressures.

am i on the right track?

i just dont need the flow of the larger compressor, but i would like to know what im missing out on..

[Limbo]

i believe same rear turbine, different front turbine.

Larger front takes more power to spin.

Also your asking fro trouble with a 10k rpm turbo car.
High rpms kill motors already, boost makes it worse.

[turbotegs]

i believe same rear turbine, different front turbine.

Larger front takes more power to spin.

Also your asking fro trouble with a 10k rpm turbo car.
High rpms kill motors already, boost makes it worse.

he's talking about the turbine rpm difference between the 2 turbos not engine revs, as he stated in his other thread that he's only reving it to 8-8500rpm!

[Scholzey]

Larger front takes more power to spin.

exactly! so why does it make more power? efficencys are very similar for the boost and air flow i want to run.. which leaves the only difference being turbine rpm..

[Punisha00]

I use to have the same problem (how on the same engine using a small turbo running eg. 10psi makes less power then a bigger turbo running the same boost 10psi) to my understanding is that, like a fan if you but a small fan blade on the motor it will startup and spin very fast but not produce much breeze(airflow) but put a larger fan blade on it and it will take longer to start spinning but make alot more breeze, and being larger will have more resistance to stop it spinning as fast as the smaller fan....
please correct me if i'm wrong

[Scholzey]

bought a gt3076r with t3 .63 ar rear housing, it arrived a few days ago.

deciding weather to keep the head the same or spend money on removing head, machining head, adding ITR cams and springs with ~85lb seat pressure, so i can rev to 9k and add boost safely and have the valves not bash the valve seats..

[Scholzey]

sent my car into the doctors to get some ITR cams put in, along with supertech 85lb springs and TI retainers. this was backed up with a new gt3076r with a t3 .63 rear housing.

comparison.

gt2871r gt3076 gt3076r

20psi 12psi 22psi
337hp 300hp 395hp
8500rpm 8200rpm 8200rpm

with power still climbing on 22psi and timing very conservitave.
i think i'll need to turn the engine to ~9000rpm to trap around 130mph on the current tyres i have.

all on bp ultimate.

hoping to get to low 11's @ 130ish on mickey thompson et streets.

i'll let you know how it goes!

[mooshie]

What engine setup is this on? impressive numbers there.

[Scholzey]

this is on a b16a2 with stock head and sleves with 8.6:1 forged pistons and eagle rods.

so still 1.6L

[hisoka]

your 3076r power is very impressive for a 1.6 l car, since the turbo is suited for 2 to 2.5 litre cars and above.

thats pretty crazy if it was still making more power too.

[Lukezen27]

So what's a straight GT30R?

[hisoka]

same thing, just the general name for the gt30 group of turbos.

when people say gt30r they mean 3076r usually


and ofcourse r meaning ball bearing


iam still amazed he ran it on his civic 1.6 litre, when people with rb25s think it maybe just a bit to large

[Lukezen27]

same thing, just the general name for the gt30 group of turbos.

when people say gt30r they mean 3076r usually


and ofcourse r meaning ball bearing


iam still amazed he ran it on his civic 1.6 litre, when people with rb25s think it maybe just a bit to large

Sweet

My K with love that

[Scholzey]

the engine was breathing a little from an early mistake with the tuning when i first got it done, but i had put like 20 000km on the engine since, and didnt notice any problems. added the gt3076r and after tuning i had it on the street for about a week then headed to the drags. blew a puff of smoke at 2nd to 3rd gear change then in 4th across the line i basically emptyed my radiator through my exhaust lol

blew out a sleve.

after inspection and looking at datalogs, it looks like my blow out was pure strength issue. engine may have been weakened previous, causing the engine to breath out the catch can... but who knows.

looking for options on building an engine now..

does anyone sleve in australia? or should i just go buy stuff from america?

[Sexc86]

Buy a mass produced short block from the states. ERL performance or Lasky racing. Especially with the strong aussie dollar....

Sorry to hear about the engine failure... come back bigger and better!

[Lukezen27]

the engine was breathing a little from an early mistake with the tuning when i first got it done, but i had put like 20 000km on the engine since, and didnt notice any problems. added the gt3076r and after tuning i had it on the street for about a week then headed to the drags. blew a puff of smoke at 2nd to 3rd gear change then in 4th across the line i basically emptyed my radiator through my exhaust lol

blew out a sleve.

after inspection and looking at datalogs, it looks like my blow out was pure strength issue. engine may have been weakened previous, causing the engine to breath out the catch can... but who knows.

looking for options on building an engine now..

does anyone sleve in australia? or should i just go buy stuff from america?

Man that sucks :(

Blew my turbo D up on the dyno, con rod throgh the block and onto the ground in front of me :eek:

Just out of interest, how's your PCV system setup?

Wrong setup can blew motors

[Scholzey]

pics of blown engine and dyno graph which shows both turbo setups.

http://picasaweb.google.com/105372738881592235178/BlownEngine?authkey=Gv1sRgCLiziIrkn5-JHw&feat=directlink

[Scholzey]

i think i have two breathers to the back of the block and one drain. not sure exactly how to explain it... mechanic put the kit in for me lol

[hisoka]

holy shit thats fuken heaps of power mate.

that must be the most powerful b series in australia

[Sexc86]

This sounds like a Similar situation to what happened to John Lee's DOHC D16 built turbo motor...

[eg5civic]

holy shit thats fuken heaps of power mate.

that must be the most powerful b series in australia

you must be forgetting the duz10s integra up here. 425kw at the front wheels man, but its b18c

[hisoka]

is that street rego aswell.

god damn lol puts turbo rwd cars to shame some of those numbers

[lil_foy]

is that street rego aswell.

god damn lol puts turbo rwd cars to shame some of those numbers

yes, street rego.

[Sexc86]

is that street rego aswell.

god damn lol puts turbo rwd cars to shame some of those numbers


And why would any car make more power depending on weather its fwd or rwd ?

[hisoka]

i was generalising a fast group of cars which are rwd.. calm down.

how many civics you see at the drags... okay , and how many rwd turbo cars you see at the drags



to op~
whats your 60 footer

[Scholzey]

on mt et street radials i did about 1.85 and on some old 22in slicks i have done 1.717