omahaturbocivic

My lag pretty much sucks and I want to know if its normal or if something is wrong with my setup. I have my controller set at 15psi and I see maybe 10psi max at 4500-5000 and in second it builds 15psi right as it hits redline. In third gear i see 15psi right at 5500 but since I have to shift at 7000 it feels like I have to shift right when the car is starting to pull and when I shift it falls to about 4500 and looses half of its boost and has to spool again.

Here is my setup
d16z6 with stock sleeves
crower I beam rods
cp 9:1 .020 over pistons
stock head
arpstuds
y8 intake manifold

turbonetics t3/o4b .63ar stage 3 wheel
turbo xs rfl bov
jrc intercooler

uberdata 1.66
modified wrx injectors (800+ ccs)
gm 3 bar map

I am starting to wish I had a t3 again because my built motor is not much faster than my stock block t3 coupe was because the t3 pulled all the time. The t3/t4 is sick when it spools but falls on its face when I shift. I have pressure tested all my pipes individually but not the system as a whole. I use t bolt clamps and silicone couplers on every connection and they are all tight so I am pretty skeptical about them leaking. Any ideas or is this normal?

RyanEJ8

Downpipe/exhaust size?

You could try switching to a .48 A/R hotside. That will help spool up some.

ash.zero

i'd suspect a exhaust leak.

omahaturbocivic

2.5 inch open downpipe that dumps right at the shifter, I ditched my exhaust trying to fix this problem which helped because it was even worse. All smooth mandrel bends.

I know the .63 ar is a bit big but I am skeptical if the .48 would help that much, im looking for more than a few hundred rpms. If this is all the better it is then I am gonna need something more drastic like spings and retainers for a higher redline or nitrous. I was prepared for lots of lag with this turbo but I did not expect it to fall out of boost as bad as it does.

RyanEJ8

Full 3" downpipe and exhaust and .48 A/R would make a big difference.

omahaturbocivic

Where the other sohc guys? Post your turbo and when you spool!

omahaturbocivic

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RyanCivic2000 &raquo;</TD></TR><TR><TD CLASS="quote">Full 3" downpipe and exhaust and .48 A/R would make a big difference.</TD></TR></TABLE>


I might look into a .48 soon then. I am still skeptical that my 2.5 open pipe is much worse if any than a full 3inch exhaust. Does having the exhaust point staight down cause excessive turbulence?

RyanEJ8

With a larger turbo, having a 2.5" downpipe will cause backpressure on the turbine even if the dp is open. You would be surprised at the difference a 3" downpipe can make.

Bailhatch

i wonder if a stg 2 wheel .63 a/r would work well for 15psi. If the compressor isn't huge it would be alright on a d16 i think. never seen it though.

racinskittle

you have a leak or something. Im running a .63 exhaust housing on my T3 and it spools pretty ****** quick. starts at 2000 2-5th gear and hits max around 45-5000. Holds well till readline.

You've gotta have a leak. Im running open DP though btw.

I bet one of the charge pipes is leaking. Also check exhaust leaks. It's hard to hear over the open DP thoug.

when does it start spooling?

Bailhatch

racingskittle, don't you have 60 trim T3? those are usualy a standard /stage 1 wheel

gotboost95

I just sold a t3/t04b .48 the other day for $150. on my B18c1 it spooled at
less than 2500rpm had mid range like crazy. Now iI went to t3/t04e .63 don't
see boost till 4500 on my 1.8 liter

racinskittle

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bailhatch &raquo;</TD></TR><TR><TD CLASS="quote">racingskittle, don't you have 60 trim T3? those are usualy a standard /stage 1 wheel</TD></TR></TABLE>

yup . Ohh, is there a huge difference between stage 1 and stage 3 for spool? All it is a bigger compressor isn't it?

Or wait. The wheels different too. Now that you mention it....what the hell is the difference?

RyanEJ8

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by racinskittle &raquo;</TD></TR><TR><TD CLASS="quote">

yup . Ohh, is there a huge difference between stage 1 and stage 3 for spool? All it is a bigger compressor isn't it?

Or wait. The wheels different too. Now that you mention it....what the hell is the difference? </TD></TR></TABLE>

Smaller wheel = faster spool
Bigger wheel = slower spool

omahaturbocivic

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by racinskittle &raquo;</TD></TR><TR><TD CLASS="quote">you have a leak or something. Im running a .63 exhaust housing on my T3 and it spools pretty ****** quick. starts at 2000 2-5th gear and hits max around 45-5000. Holds well till readline.

You've gotta have a leak. Im running open DP though btw.

I bet one of the charge pipes is leaking. Also check exhaust leaks. It's hard to hear over the open DP thoug.

when does it start spooling?</TD></TR></TABLE>

I also ran a .63/.60 t3 on my old setup and it was a perfect compromise, I started spooling a couple psi at like 2500 and I saw 10 psi by 4000 and it held it when I shifted. Now with the t3/t4 it might see a few psi at 3500 and maybe 5psi at 4000-4500.
I have examined pretty thoroughly for any exhaust leaks and dont see any obvious ones. I guess next step will be pressure test the whole system but I am not getting my hopes up. In my experiece I have seen bad leaks (like completely uncapped vaccuum fittings) not cause too much more than a few hundred rpm lag and I dont think I have any that are that obvious unless im totally missing something.


Anybody else have a t3/t4 on a sohc want to share their spool times?

boostincoupe

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by omahaturbocivic &raquo;</TD></TR><TR><TD CLASS="quote">Where the other sohc guys? Post your turbo and when you spool!</TD></TR></TABLE>

Greddy 15G, pretty much spools at idle

*grabs keys to go for a drive*

J337_UNIT

thats the price you pay for running such a large turbo.

EJ8 D15Y8

Ive got a T3 .60/.63 from a nissan.

On a d15 with 10:1 comp and shot rings.

Turbo has blown seals too.

Charge piping is way to0 big at 2.5

Doesnt start to boost until 4500. 5psi right away.
By 5-5500 its at 7 psi. Thats where my wg is set.

2.5 inch downpipe/exhaust.

sleeping GIANT

14b on a jdm z6 and mine starts to spool before I even start my car!!!!!!

Bailhatch

man, all you guys with standard T3 wheels are not doing something right. I can get 11-12 psi at 3000rpm in 3rd with mine.

2.5" exhaust w/ cat, short tubular manifold, bit of extra timing through the boost transition at about 13:1 afr till 2-3psi. I would be pissed if my car only pulled from 5500-7300

USDM 4G VTEC

14B turbo here

i can see 2 psi as los as 2200 rpms


but i get the full boost around 3800....

twkdCD595

t3/60-1, stock f22b1, 4600rpm in 2nd gear... 10 psi

btw thats through a 3" dp.

Devine

wow something doesnt seem right there. im running a t3/t04E granted i have a .48 ar exhaust housing but i see 12psi at 4300rpm. Like previously suggested i would suspect either an exhaust or boost leak somewhere.

b_ron007

wow.....theres definitely a leak or something. once i hit 15psi on my t3/t4b i hold it there every even after shifting. i get like 15psi by 3,500rpms on my SOHC F23, start boosting @ 1,800rpms

Teg4e

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b_ron007 &raquo;</TD></TR><TR><TD CLASS="quote">wow.....theres definitely a leak or something. once i hit 15psi on my t3/t4b i hold it there every even after shifting. i get like 15psi by 3,500rpms on my SOHC F23, start boosting @ 1,800rpms</TD></TR></TABLE>

F23's don't apply... he's talkin about 1.6 liters.