Dave_yd

hi,

firstly, im looking for around 320bhp out of my setup with as low spool time as possible as its a road race car, my setup:

83mm benson/laskey 9:1 Block
CTR ek9 head, completely standard intake, tb etc.
SLS shorty manifold,
3inch exhaust

i have been offered a very good deal almost too good to turn down on a 3071r, and i was thinking if i put the .48 t3 housing it might be okay, anyone got any experience on this?
when does it spool etc.?

My other thought was the GT2860rs with the T3 0.63 housing ideally this is what i would prefer for its great spool characteristics. how would the 0.48 3071r compare to this?

Do you think the Gt3071r will be okay for my road race application and what hosuing?

Cheers
Dave

TheShodan

iTrader: (14)

The GT3071 Would be more ideal. Also, raising your compression a bit to at least 9.5 will do even more good on the circuit. From experience, the T3 GT2860RS is not the great turbo for road race as it looks on paper.

Pompiuses

'mrlegoman' has a 81.5mm B18C Civic running a Full-Race Road Race kit with a .63AR T3 GT28RS.

A few vidoes here:
http://www.youtube.com/profile_videos?user=mrleg0man

Seeing how well that car works, I really doubt a GT3071R would be a better choice. Specially in regard to response/on-off/part throttle, which is what you need for road racing.

Enige setup here:
https://honda-tech.com/forums/forced-induction-16/full-race-b-series-gt-stage-i-plots-impressions-comparisons-1315396/

Here's a dyno that Jeff Evans did a while back ago comparing the GT28RS T3 .82AR (solid lines) vs. GT3071R .63AR. Both at 12psi on a stock B18C1:

Dave_yd

I think that graph has answered the question tbh GT2860rs!, also the car in the vid is very good just what im after

TheShodan

iTrader: (14)

Ok. good luck to you.. I've used both, and the variables depend upon the track. On most of the tracks i've experienced in the U.K. I've found that the GT3071R worked a bit better against the skylines that we on there with me, with less boost, and less heat. Upping the static compression helps with off boost recovery spool even moreso than just the turbocharger. The midrange of the car was much nicer with the GT3071 and is more versitile on multiple tracks.

Dave_yd

okay, point taken mate. As ive said its a really good deal on the 3071r so unless a fairly good deal comes up a 2860rs then il stick with the 3071

what do you think about the .48 housing on the 3071 with my setup?

Alfa Turbo

I run a GT3071R with a .63 on a 2 liter and echo this choice over the disco. You will make the same or more power with less boost making it "easier" on the engine. If you were building a street only motor I might suggest the smaller turbo but I am so impressed with the 3071 it would be a hard call to make. I have so much midrange and all the TE I want.

I would NOT suggest the .48 turbine housing.

On the dyno comparison... a word of caution, a dyno is just one measure of power production and does not re-create road conditions all that well. Ever wonder why after a dyno session there are always a few pulls made on the street to confirm?

Peace and good luck with your project.

Dave_yd

okay, thanks for your opinion. what sort of RPM do you see full boost on the .63?

hondaapi

We run a GT3071R on a stock sleeve 1.8l b18C5 and only use the car on european race tracks.
The Gt3071R is an great turbo on that engine. Great midrange and great top end for that kinde of use.
With a good chassi,tranny,wheel,tyre,break and suspension combination the car will be definetly able to beat some VLN Porsches and Lambos ;-)

Here a vid: http://de.youtube.com/watch?v=6OF3l5rvik4

Dave_yd

^that car looks very impressive,

have you got anymore details of your setup?

what housing on the turbo?

Alfa Turbo

Yikes, this kind of question reveals how little you know about road racing and turbo selection!

The answer is it depends.

Take Mid-Ohio for example.

Coming out of the pits in liesurely fashion I am in second and accelerating as I blend with the racing line. Here the engine will hit 1 bar around 4100RPM. A quick change to third and then a tap of the brakes and down to second to set up the left hander beofre the long right of the keyhole. Here revs are around 4K but only part throttle as you modulate your line. Once past the apex I feed in throttle pretty quick as I unwind the steering wheel and the turbo responds likewise and 1 bar is reached instantly. Shift, third, instant boost, rinse, wash, repeat.

So you see, just asking what RPM you reach full boost does not answer the question I think you are really after. Take two identical cars, one with a .63 and one with the .48 and I will gurantee you the smaller turbine will reach 1 bar a little quicker but will also see the back end of the larger turbine the whole lap.

Peace.

Dave_yd

^ yer i agree im a total amateur which is why i immediately thought the 28rs would be better.

Basically, as close to instant boost as possible to the better, but overall the 3071r sounds like a good choice

hondaapi

What kind of block is it? B16, B18 ??

TheShodan

iTrader: (14)

I love it.. Nicely put.

preludedude2001

Hi, doesn't the 2860rs come with a T2 housing? So, a T3 option is possible? I am building a turbo for a stock prelude H22A(2001) any suggestions? Garrett recommend the 2860, I was thinking the 3071. Log style, I have to keep my AC. Just for cruising around, no real race. Want to maintain some efficiency on the hwy. They said the 0.63AR. I had figured on using the 0.82, but they recommend against it. Any thoughts? Thanks

TheShodan

iTrader: (14)

.63A/R is recommended highly over the .82A/R T3. 2860RS has a T3 option available, but not recommended, especially on an H22. I actually recommend GT3076R over the GT3071R for the Prelude platform since no real racing is involved with the larger displacement engine at 52lbs/min

X2BOARD

How would the 3071R handle shorter autocross courses as compared to the 2860rs ? On paper, the 2860rs looks ideal for my application which needs a T3 flange... what is the issue with getting it in a T3 ?

LightningTeg

Id go smaller for AutoX. You really need something that will have a fast response that is predictable and wont shred the tires off since you'll be sitting in 2nd the whole time most likely. You also dont need much more then 230-240hp.

T25 GT28R stock LS

http://www.youtube.com/watch?v=eP0TN8UZfPE