B18C turbo

**Lukezen27** · 24-09-2009 12:01 PM

Originally Posted by Limbo

nah you need to upgrade the map sensor when going over 10PSI otherwise your readings go crappy, doesn't matter what ECU

FF - nah i'm holding on the the 3bar sensor, its a Bosche so should be decent in case i wanna go higher. Been told they are hard to come by.

My D turbo held 11-12psi on stock MAP

**FastFwd** · 24-09-2009 12:29 PM

Yeah im looking for a good 3bar sensor... Im not in any rush.

**fat_85_civic** · 24-09-2009 04:27 PM

look on ebay man, i got a GM one for like 60 bucks i think

**lookingforboost** · 24-09-2009 08:10 PM

just got my 3 bar sensor

**FastFwd** · 25-09-2009 09:52 AM

the map sensor you guys have is it generic or was it made to fit b series?

**Limbo** · 25-09-2009 01:28 PM

the one i got was off a b18c

**mooshie** · 29-09-2009 10:13 AM

just to get this back on track, here are a couple of comparisons-

as you can see the rear on the GT30 has a fair bit more flow than the GT28 having said that, the difference between the .64 and .86 on the 28 is quite big as well, maybe this would be enough?

**ZeForce** · 29-09-2009 01:00 PM

Personally, I wouldnt get the GT3071R with a T28 style exhaust housing, it is more efficient with the .63 T3 housing

**Limbo** · 29-09-2009 01:16 PM

agreed ^^^^

The T28 flange adds too much restriction on the GT3s

**Scholzey** · 29-09-2009 04:51 PM

what do you guys think would spool faster,

gt2871r with .82 t3 housing

or gt3076r with .63 ar t3 housing

this on a b16a2 with ~8.6:1 CR

i ask this because i went from .63 t3 -> .82 t3 on my gt2871r and it gains full boost over 1000 rpm later now. was around 4250, but now it seems 5500 or even a little later, i wonder if the housing is just too big for the turbine.

although my powe rband now is much more meaty, i wonder if a gt3076r would net me similar spool, but more power from a better efficency part of the compressor map + later choking point from the turbine outlet.

this is for 20psi on pump fuel btw

**Limbo** · 29-09-2009 06:15 PM

hard to say cos i've never seen the .82 rear on the gt2871r.
I know on my gt2871r T28 with .86 rear , it starts to spool at about 2,300k, then hits 10PSI at about 4,500k.

Haven't seen a gt3076 on a b16, but it would be at least another 500rpm later

Judging by my compression and a 8.6 i'd say it would take another 250 to 500rpm more to spool up + 500 or so to boost to 20PSI. Once you get about 6PSI the boost will jump very fast.

that's my best guess