Built b16, hi comp + boost ??

ok ened up getting the .86 rear, we'll see how i go

Zeforce Can you by chance cruch some graphs again for me?
JUst wondering where the efficency is for a GT2876R with a .86 rear is? Thanks all that cruching is beyond me

Quote:

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Originally Posted by Limbo

b16 being a smaller engine does not boost as quick as the b18.
For the smaller b16, a t28r is fine for street, quicker than alot of stock turbo cars.
But i'm only after a small increase. The T3 is too big for general street driving on a b16, my friend has this and boost does not kick in till 5,500rpm, i've seen most of the b18s though come on alot quick at 4k.

If i can get boost earlier i'd rather sacrifice some top end for the drivability

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exactly why i opted for the GT28RS for my b18....
but id love to know wat a GT30 or something would go like :p

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Originally Posted by VTi_b0i

exactly why i opted for the GT28RS for my b18....
but id love to know wat a GT30 or something would go like :p

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We'll see Christian..

Adrian (TODD among a few others think the 0.86 rear with be a good match.

The complaints about lag on these bigger rears is from other motors with low comp

lol luke your on drugs you should read wat you post at times.

VTi boi - well based on what i've seen the RS,71 & 76 all have the same rear wheel.
My understanding is they should all react very similar on spool. The different front will allow for more boost..... due to bigger wheel....

Again i'll have to test this in real life. I've seen a R(mine) & RS in action, when i finish i will see a 71(luke's) & a 76(mine) in action.

P.S i'vee seen a GT3/4 in my friend's EM1, does 11s, but boost kicks in like 5k rpm and its abit of a dog to drive around the streets

Then we can compare abit more

Quote:

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Originally Posted by Limbo

Zeforce Can you by chance cruch some graphs again for me?
JUst wondering where the efficency is for a GT2876R with a .86 rear is? Thanks all that cruching is beyond me

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http://c1.ac-images.myspacecdn.com/i...00312a2b3c.jpg

NOTE: This is just for compressor efficiency... nothing to do with exhaust housing size

sorry i dun understand, can you tell me roughly what rpm that might be?
Is that basically between 4krpm and 8krpm again?

Quote:

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Originally Posted by Limbo

sorry i dun understand, can you tell me roughly what rpm that might be?
Is that basically between 4krpm and 8krpm again?

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Yeah those points are 4000-8000rpm and 12-13psi required to produce around 180kw@wheels

cool looks like the 60/71/76 & 3071 have very similar efficiency
Now all its gonna get interesting depending on our setups

Quote:

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Originally Posted by Limbo

cool looks like the 60/71/76 & 3071 have very similar efficiency
Now all its gonna get interesting depending on our setups

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Yeah, at the end of the day it's all about the right combination of parts, manifold, compressor size, exhaust housing size, exhaust, etc all working together. The 2871, 2876 and 3071 have similar efficiency maps and all rated between 450-500hp but the disco potato (GT2860RS) is smaller and would offer more midrange power compared to the others and is still good for over 350hp@flywheel

just to correct disco potato is gt2860rs

But thanks for your calculations, i'm abit dumb when i comes to complex calcs

Quote:

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Originally Posted by Limbo

just to correct disco potato is gt2860rs

But thanks for your calculations, i'm abit dumb when i comes to complex calcs

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No problem I have been messing around with these calculations for my own turbo build. Just a reminder these are simply approximations to give you a rough idea for picking an appropriate compressor size. And I would like to point out for those that dont know, with a well designed manifold, correct exhaust housing size and efficient intercooler setup you may be able to make more power from less boost. For example, you might only need 9-10psi to produce 180kw@wheels with a B16a.


PS: Thanks for pointing out my typo :)