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596 Posts
Discussion Starter #1 (Edited)
Post Your 4AG Turbo Setup (Feb 2006)

I know this topic has been done a bunch of times... but this will allow for any updates or current mods not posted before, and immediate future mods. It is also a new topic.. since the last one was done about 4 months ago as far as I remember.

AE92 GTS Coupe

Engine Parts:
4A-GE Red-Top Jap Spec 40k miles
Stock head & block
JGStools Log-Style Turbo Manifold
Volvo 740 OEM turbo & internal wastegate
Manual boost controller
Mazda MX-6 GT OEM B.O.V.
Saab 900 Turbo OEM Side Mount Intercooler
Suzuki Swift Radiator

Stock USDM N/A electronics
Stock Fuel Pump
7M-GE 315cc Injectors
Adj. Fuel Press. Reg. (40 psi)

How car runs/Horespower:
Engine is running rich since at idle... though not excessive. Runs okay until 5k where I let off cause its not tuned properly. Im running 6 psi, no downpipe yet. Spools around 3k rpm and seems to pull to redline. No chance to dyno or track yet, but estimated 130-140 whp.

Future: 365cc GZE injectors, custom downpipe, & 10 psi

7,127 Posts
Papo J -
88 MK1 NA chassis
88GZE motor
KK108 cams
Home made manifold (modified stock piece)
DSM T-25 turbo from 2nd Gen Eclipse
BOV from 2nd Gen Eclipse (recirculated after AFM)
Izusu Impulse A/A intercooler
GZE injectors
NA electronics
AFM before turbo
Custom 2.25" exhaust piping (I built)
Stock NA fuel pump and regulator
Stock timing, TVIS, removed EGR
@ 10psi, spools at around 2600
Retarded the AFM wheel about 6 clicks to lean out the mixture at idle
I'm guessing around 175-180 whp. Driven about 90 miles daily.

1,219 Posts
Just finished install of A/W intercooler using St165 IC and a cutdown Geo Metro radiator as a heat exchanger.


'87 with 4agze out of a JDM ae92
Stock NA tranny
"Plug n Play" MSnS-Extra controlling fuel and spark.
DSM 1st gen BOV
Home-made log style manifold.
Innovate LC-1 wideband AFR control
DSM T25 currently pushing 14 psi
DSM 14b waiting in the wings with goal of pushing 18 psi.

No dyno yet, but lots 'o fun!

398 Posts

chassis = ae86

-ae92 4agze w/8.9:1 compression and small port head
-techno toy tuning smallport to largeport intake adapter plate, with modified intake manifold (welded valleys)
-MegaSqurit1 v2.2 PCB with Ford EDIS ignition from '91 Escort running
-portable LM1 wideband O2 sensor setup for tuning
-MSnS-extra firmware
-NGK 4agze spark plugs gapped to .033"
-440cc Supra injectors with stock ae86/4age resistor pack
-190 lph Walbro fuel pump for a MK3 Supra
-IHI RHB5 turbo, identical size to t-bird turbo coupe, with Isuzu turbine housing, watercooled centre section. I'm tapping water from the throttle body using brass couplings for hose diameter adapters (temporary)
-McMaster Carr SS 1/4" oil feed line with corresponding fittings, including quick disconnect at the turbo, 3 finger brace to hold the block tee in order to remove stress so it doesn't crack
-Adjustable actuator, boost currently peaks around 11.5 psi
-Homemade log manifold with 1.6" ID elbows and tees
-2.5" OD downpipe and resonator, with 2.25" OD cat back exhaust piping to muffler
-Ford Probe Intercooler front mounted
-New style Bosch by-pass-valve (harder seat)
-Generic NAPA rad hose for couplings, except IC-TB has 2.5" Vibrant silicone hump connector, home depot SS hose clamps

Car is running really well with the current setup. The boost curve is a bit odd, it hits 6 psi quickly then creeps up to 11-12 psi around 6000 rpm which it then holds perfectly stable til 7500 rpm. The initial 6 psi comes between 2300 and 2800 rpm. The climb from 6 psi is very gradual, and due to my ae86 weak driveline I'm not too worried, it's probably a good setup for preservation of the tranny. Based on dyno of previous setup, I expect this is making approximately 200 WHP.

44 Posts
1988 Corolla FX
Running 15psi on:
Big Port 4AGZE
ARP studs
Honda civic dual core half cut radiator :thumbup
TRD metal HG
Megasquirt N Edis
Custom homemade tubular header
Holset HX35 turbo with Bullseye housing
550cc injectors
2.5" intercooler piping
255 Walbro external pump
Greddy bov
4 puck no name clutch
No name oil relocation kit
2ng gen mazda RX-7 oil cooler
Turbo XS boost controller
Tial knock off wastegate
3" exhaust turbo back straight pipes no cat
Sard fuel regulator
Big diesel truck intercooler cut in half :evillaugh
Automete boost and egt gauges
and cheapo walmart oil pressure and temp gauge
And a very stripped interior and solid motor mounts make for a
very noisy ride :thumbup

Car is down at the moment last week I cracked a ring land on the 4th piston :mad:
But it pulled like a mofo, boost comes on very hard after 4,500 rpms and no
LSD makes it a little scary :smile:

465 Posts
'86 NA 5-rib
7psi on:
Rally2 Manifold and Downpipe
Internally gated Garrett .42/.48 T3
Stock bolts/gasket
GZE injectors/FPR
Stock '86 NA Electronics
Tweaked AFM
Timing backed off 2*
Stock clutch/C-50
Ford Thunderbird IC
Summit Single oil-filter relocation kit
Currently no BOV as my HKS bypass has a 14lb spring
2 step colder plugs (7s)

Car is running NA currently as the junkyard Saab turbo I was running decided to start spewing oil into the exhaust side. My new (to me) turbo just showed up today and it should be on in a couple weeks when I go and replace all my plumbing. I was running MSnS-E but it seems to be dropping spark lately, so I pulled it and started running the stock electronics.

Have a bunch of parts in various shops right now, and the current plan for a new motor is:
'89 GZE block
Micropolished and Cryo-Treated Crank- considering Nitriding
Shotpeened, Balanced, and Cryo'd Stock GZE rods
Stock GZE 8.5:1 pistons
Full rotating balance with Fidanza flywheel
ARP Everywhere
Haven't decided on a headgasket yet, but definately metal
550 cc/min RC injectors
Setrab A2W IC
Garrett Super 60/.63 Internally gated T3
MSnS-E w/launch and boost control (if I ever get it working right)
HKS Racing Bypass valve vented to atmosphere
Intermediate head/port work - I'm doing some testing with high velocity porting.

There's probably more, but I can't remember it all right now. I have it written down at home.
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