What's the BEST way to modify a TII? What the correct way to do it? This will hopefully give me some ideas on what I'm missing and what I need to do next too. I know MONEY is an issue, but let's say that WE GOT PLENTY! So, our project car is a BONE STOCK 1990 Turbo II...where do we start?

 

save your money and do it all at once, less problems and saves money too.


EX.
you go out and buy a downpipe for your 7 now, later you want to upgrade to a turbo that does not use the same exhaust flange as your downpipe. Now you have to go spend money on another downpipe.

I could elaborate on this subject for hours, but I dont want to.

just my 1.5 cents

 

You need to decide how much power you want. This will determine the path that you need to take.

200-240 rwhp
------------------
Larger Secondary Injectors
Exhaust
FCD
Intake

240-275 rwhp
------------------
Mild street ported engine
Larger Secondary Injectors
Exhaust
FCD
Intake
Aftermarket ECU(ideally)
or an F-con (acceptable)
or remapped ECU with SAFC and some other POS boxes... (Boo!)

275-300 rwhp
------------------
Street Ported Engine
larger Secondary Injectors
Exhaust
Intake
Aftermarket ECU(ideally)
or an F-con (acceptable)
may be time for an intercooler

300+ rwhp
------------------
Street Ported engine
secondary injectors
exhaust
intake
aftermarket ecu
turbo
intercooler

These are just VERY broad and somewhat rough outlines. there are exceptions to EVERYTHING above... but in general, they are failry accurate. Guys, feel free to add stuff...

 

ROSHX7,

Well gagues should be the first mod you make. This will tell you if other mods are destroying your engine or not.

Gagues should be air/fuel, boost (psi in the US), exhaust temp, and coolant temp.

Stage I usually includes:

downpipe (elimintates the pre-cat), perf. intake, performance exhaust, performance catalytic converter, cold air box, fresh air headlight scoop (to supply cold air into your cold air box or alternately the mariahmotorsports racing nose that has air intakes all the way accross the front), performance clutch, etc..

You might want to upgrade the shocks & springs in stage I as well.

Some people also changeover to an electric fan and remove the belt driven one. Personally I wouldn't do it as I'm sure rush hour traffic and 95-120 degree road temperatures would cause the car to overheat.

Stage II and III gets into larger fuel injectors, aftermarket computer to control boost & fuel injection, additional fuel injectors, better fuel rails, better pulsation damper (I think that's what it's called), larger turbo, lighter flywheel, replacement pullies that change the gearing ratios, etc...

Notice I didn't say anything about trans, rear diff, or driveaxel upgrades. The TIIs were designed with 300-450HP in mind. I think mazda was considering a 3 rotor option and needed a drivetrain that could handle it.

 

the most common stages

stage one. add full exhaust, intake, and FCD.

stage 2, replace blown engine and either add more fuel or remove exhaust.

 

porting the wastegate on the stock turbo is also an option. i wouldn't know about it other than the fact that the previous owner did it on mine. and it has intake, downpipe, no cats, and a catback and no boost cut/creep at all...this will help you run more boost in the long run with the stock turbo...

 

 

Kurgan, there is no way in hell you are gonna make half of those numbers with the stock turbo, the stock turbo is good for around 240rwhp absolute MAX, you need either a) a bigger compressor or a full T04 or similar

the easiest way to do this thread is tell us how much HP you want to end up with and we'll inform ya what mods you need to achieve it.

 

Pls keep this thread going.. Im also wondering of the same thing if i should put my mods together at once. I will be building a new streetported motor with all the stageIII mods plus some other things that whistles (BOV and all that kind of stuff)

 

I agree on the guages.

According to Juan Rivas (ITO), an EGT guage can be a good substitute for an air/fuel guage, because the exhaust gas temp will let you know if you're running too lean under boost, or just lean enough

 

say someones ultimate goal is a to4 and a e6k pushing about 350-400rwhp. then what would you recomend? would it be alright to instal a haltech first on stock motor and do other mods on at a time? if doint this way how woul one reccomnd ths? if you dont like this idea then how would u recomen gong about it? just save up for however long it takes to get tha money and do it all at once

 

Crusdar_9x - yes, that is a very good approach, that way you have the right amount of fuel going in and the right igniton timing at each stage. Provided you get it tuned to suit.

for 350-400rwhp you need
Higher flowing fuel pump
either 720cc all round, stock primaries and 1200cc secondaries or a larger combo which gives you in excess of 2800cc fuel delivery.
Adjustable FPR
Intercooler
T04 with 0.96A/R exhuast housing or larger and something around a 60-1 or similar sized compressor
Suitable exhuast manifold for the T04
3 inch exhuast
Haltech E6K or Similar Engine Management System

Either with the stock ports blow 12psi+
Or with a ported engine blow 8-9psi +

400rwhp can be achieved with the factory ports but you'll require higher boost than you would to make the same HP numbers with a ported engine. The power will be peakier with the factory ports and you will have increased lag.

 

HWO, like I said in my post, its a ROUGH guide. And yes, you can get 275 rwhp out of a turbo... not easy or common at all, but I've seen dyno charts of it. I think reted did 250+ on the stock turbo...

Also, like I said, give us a horspower goal and you WILL get the info you need. The best first mod would be a standalone system... Haltech, Wolf 4, Tec II or III... something along those line.

 

Hey im also wondering about the same thing. But alot of people yold me to start stock then start upgrading slowly. I dont know if this is true.

 

Or this:

stage 1: add full exhaust, intake, FCD & Crank up the boost

stage 2: replace blown engine & turbo and add more fuel

stage 3: replace blown engine & turbo again and turn DOWN the boost

stage 4: apply for welfare

That sounds MORE familiar to me...

 

From what i have read on here ted uses hybrid turbos, T04 type compressors slapped onto the stock turbine set up.

10-11psi is the limit of efficiency for the factory compressor wheel.



By putting in an aftermarket EFI system to start with you bypass the 2nd 3rd and 4th stages.

 

im opting for a pure street car. Im going to try and achieve a 13.0.13.3 on street tires, stock engine/turbo. I bet Ill hit close to 250 rwhp, maybe i dont know enough....im not an export

Ill list my current mods, then plans to do so.

Current Mods.

------------------------
89 Turbo
MidPipe
Intake
Fresh Headlight Scoop(not had at my track run)
Boost Gauge
Air/Fuel Gauge
FCD
Turbo Timer
Super AFC
8.5 mm wires.
removed airpump/acv/ Current Best . 14.5@95. first time at track, shitty driver<--me

---------------------------
mods by summer and ultimate goal.

downpipe, catback
ported wastegate
avc-r set to 9-10 psi
possibly g-force or something a little better for a remapped ecu.
720cc secondary injectors
act clutch kit
front mount intercooler
ignition
hks ss bov
all suspension redone
short shifter
fully tuned
245's on the rear

Ill bet with that and a good launch, I can get really close to my goal of basically a sub 13.5 hopefully closer to 13.0 on street tires. and somwhere close of 250 rwhp..


My FIRST time at the track with basically me as a shitty driver and a midpipe and intake, my super afc isnt doing anything at this point, and I still managed at 14.5

 

when iputthe haltech on when doi need to upograde to a walbro? will the walbro handle say 400rwhp? if not then whitch pump? if i put 720 \cc in with the haltech how much booost or whatever will the stock pump support? also say after i get the haltech and fuel setup for a big single, what size intercooler would be recoomended? also what kind of lag to expect with stock turbo with intercooler for a big single. also what kind of exhaust? just a single 3 inchno cat or muffler? i would really love to keep thew duel look. so maybe a 3 incher goingto two 2 1/2 inchers or what? thanx

 

BUMKP

 

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