Built b16, hi comp + boost ??

[Lukezen27]

Can't wait to see the results...

I'm in close tot the same boat lol

Custom 440HP Ball Bearing APS SR40 front and a Garrett 71R rear .86 Turbo

.86 a/r Exhaust, Flanges Supplied
.60 a/r Inlett, 2" Discharge, 2 1/2" Inlett

[IEVAQ8]

do you mind me asking which t28 you had previously? Looks similar to my T28R setup,
The GT2876r is rated at 480hp same as the GT3071r
hopefully it will respond similarly to your GT3071

it was the stage 2 avo turbo kit which is rated at 400hp liek i said with 0.86rear.....

IEVAQ8, the 2 setups your comparing are quite different. Using and internally gated t28 turbo with a .86 rear housing, smaller exhaust and log manifold to a externally gated .82 rear housing 3037 with larger exhaust and tuned length manifold. naturally with a smaller rear housing, external gate setup and bigger exhaust and tuned manifold you would reduce lag considerably.


i originally had a GT28R on my 180sx. with the exact same setup and only changed the turbo to a 3071R with the same Comp housing and same .64AR t28 rear housing, the turbo was laggier (not by much) but yes it definately did make more power.

on both setup were you running the same amount of boost too??

on t28 it ws on 8psi on gt30 it is on 7.5psi.....

I would also like to point out that the 0.82 T3 exhaust housing is actually bigger than the 0.86 T28 exhaust housing.

Anyways, I crunched some numbers... 180kw@wheels is roughly 300hp@flywheel which would require a flow rate of 28lb/min @ 12psi for a B16a. If you wanna check these numbers yourself check the garrett website for the equations. I have graphed the compressor efficiency for 4000-8000rpm. As you can see the 2871R and 3071R are pretty close to the surge limit and would definitely experience surge with a smaller exhaust housing. However, peak power does fall in a much more efficient part of the map and hence will produce more power but IMO this isnt really ideal for a street setup but much better suited to a dyno queen.

all good, but dont be fooled by the garrett calculator, it doesnt allow for a VTEC engine..........which is completely different characteristics to any other engine.............u cant compare a 1.6 litre barin engine to a b16 for example as vtec plays a huge part in almost doubleing the amount of air our exhasut blow out once in VTEC.............

their is alot of research to be done before turbo charging a honda.....
can i also point out..............the t28 graph i posted was making 178kw or so, but that was detonating as well, as the exhaust housing was way too ristrictive................

[Lukezen27]

their is alot of research to be done before turbo charging a honda.....
can i also point out..............the t28 graph i posted was making 178kw or so, but that was detonating as well, as the exhaust housing was way too ristrictive................

I remember when you were having those problems..

So it ended up being tht rear

[IEVAQ8]

I remember when you were having those problems..

So it ended up being tht rear

sure was the rear housing.............before i sold off my avo kit, i borrowed a friends turbo to do some background research......

we used a t28 with custome 1.06rear housing and didnt have a problem, but it didnt feel or was no where near as strong as the gt30 in the top end........

GT30 FTW

[Limbo]

yeah basically outflowed the t28r, but you have a b18 so there is abit of difference

[IEVAQ8]

yeah basically outflowed the t28r, but you have a b18 so there is abit of difference

b18 or b16, its the same principal..................high comp vtec............ask any real proper honda tuner

[ZeForce]

all good, but dont be fooled by the garrett calculator, it doesnt allow for a VTEC engine..........which is completely different characteristics to any other engine.............u cant compare a 1.6 litre barin engine to a b16 for example as vtec plays a huge part in almost doubleing the amount of air our exhasut blow out once in VTEC.............

wow Im a VTEC fanboy as well, but you give it way too much credit... VTEC doesnt make that much of a difference it's just switching to a larger cam profile after all. Our honda engines do have a greater thermal and volumetric efficiency compared to most other engines and that was all taken into account with I did the calculations.

[IEVAQ8]

wow Im a VTEC fanboy as well, but you give it way too much credit... VTEC doesnt make that much of a difference it's just switching to a larger cam profile after all. Our honda engines do have a greater thermal efficiency compared to most other engines and that was all taken into account with I did the calculations.

i will give our engines credit as they were designed back in the 80's and still one of the best designed engines..............i dont think untill the later 90's any other company was able to come close to it.............who would have thought of 2 cam profiles on the one cam?????

dont talk our engines down, u know u love them.....lol

if u took into account the vtec thermal efficiency and agressive cam profile in the vtec range then thats a good thing.......i still think gt30 is the way to go.

[ZeForce]

i will give our engines credit as they were designed back in the 80's and still one of the best designed engines..............i dont think untill the later 90's any other company was able to come close to it.............who would have thought of 2 cam profiles on the one cam?????

dont talk our engines down, u know u love them.....lol

if u took into account the vtec thermal efficiency and agressive cam profile in the vtec range then thats a good thing.......i still think gt30 is the way to go.

I do in fact love our greatly engineered engines, they are a work of art in my mind. However, I was just pointing out that our engines dont defy the laws of physics simply coz they have VTEC.

And Im not saying the GT30R is a bad choice of turbo but IMO it's designed for much higher boost levels and flow rates. It actually a very good turbo if you are chasing power over 300kw@wheels and a slightly smaller turbo might be better for someone who is chasing less power for the street.

[IEVAQ8]

^^^true true...........but for the money u cant go wrong............i'm only on 7.5psi and making a healthy and safe 239kw at the wheels (on a hub dyno) and if i want more i can............its also alot easier to make the power with a biger turbo even if the owner only wants 180kw........

it does make a huge difference once u take into account the vtec loads..............

im not the only one who has had probs with t28 on a vtec engine, and they were 2 different tuners too......

anyways, both our points are valid and have their advantages and disadvantages......

i hope our conversation can help someone...........

[Benson]

^^^true true...........but for the money u cant go wrong............i'm only on 7.5psi and making a healthy and safe 239kw at the wheels (on a hub dyno) and if i want more i can............its also alot easier to make the power with a biger turbo even if the owner only wants 180kw........

it does make a huge difference once u take into account the vtec loads..............

im not the only one who has had probs with t28 on a vtec engine, and they were 2 different tuners too......

anyways, both our points are valid and have their advantages and disadvantages......

i hope our conversation can help someone...........

Agree'ed honda loves their big turbo

[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