azsuptt

I need to Lowered the Boost How can I get 8 or 10 PSI on Stock TII with Mild Trim, scape, DP and Exhaust.

I allredy Blew a rear housing and a rotor for overboosting. Just put a Fuel regulator,New Filter, FCD and a Manual BComptroller comletley close and still PSI is over 12.


1) Does someone have a TII Wastgate for Sale?
2) Does my Problem comes from the Stock wastegate?
3) Can I get 8-10 PSI as Max wioth a stock wastegate?

HELPPPPPPPPPPPPP

$150FC

You need to port the wastegate. This involves removing the turbo, removing the backing plate on the turbine side, and grinding away metal to enlarge the size of the wastegate hole. Do a search and you will find many many threads.

FYI the stock TII wastegate is internal, that is, it is integral with the turbine housing.

What is "mild trim" and "scape"?

TurboII2NV

what kind of a Bcontroller u got
cuz I am only getting max 10 psi and I want moreee

azsuptt

$150FC
Its the most common trim for street performance Maybe that is not the correct term but involves grinding away metal to increase internal power.

I'm very interested in knowing how to proceed with the WastegateIs there Someone here that knows the procedure.

1) Procedure for Wastegate Grinding,
2) Is it better and more cost effective buying an external Wastegate and installing it, ?
3) Why No One talks about this when sugesting modifications to the FD. Seems to me is important to level the Boost or does my wastegate is in bad shape and that is why can't control de boost?
Sugestions?

KNONFS

iTrader: (14)

BORICUA!!!

-Port your wastagate

BTW - Which fuel pump are you running?

azsuptt

TurboII2NV

Is yours a TII, Mine goes over 12 like that is nothing even before the light trim on the motor that was done with the repairs.

The turbonetic manual boost cotroller is a beautifull complete unit with nice hoses for implementation check themat the web.

Does tjis mean my wastegate is capable of controlling boost levels under 10PSI

Sugestions are very very welcome?

igottafc

iTrader: (6)

the stock wastegate on t2 are really only good for stock boost levels, Once you turn the boost up, it will start creeping. Your wastegate is in stock shape, not bad shape, thats why its creeping, Like $150fc posted, search for the wastegate porting thread. Im not sure about FD's but if it isnt mentioned that much than it must mean that their wastegates are adequate enough for more power, ours on the other hand arent.

azsuptt

I'm Still under stock fuel pump, and bough a FCD this weekend just in case for my overboosting.

This weekend I also replace the Fuel filter(I believe this may had have a negative impact on the last motor I blew along with the overboosting, The filter looked like no one have change it before , there was more dirt than in a dirt bike after a competition.,

Added a Botch fuel regulator
Intalled a turbonetics manual Boost control to see if I was able to stop the PSI from raissing above 10 PSI with no luck.

So Wastegate last resort and hopefully this motor will last.

I didn't waste my money since the filter seems have never been change but did not solve the problem.

igottafc

iTrader: (6)

a boost controller cannot lower the boost pressure, only raise it from what the car will naturally run. the DP and exhuast are big players in causing boost pressure to naturally rise because of the less restriction, the turbo has less resistance to spin so it naturally tends to spin faster resulting in higher boost pressures. You said your car was hitting 12 PSI? Are you hitting fuel cut at all?

azsuptt

I never notice fuel cut at all, but both times it broke the rear rotor and the rear housing,

I did't have a FDC either, i believe no fuel was getting there, thats why I bough a regulator,FDC and change the fuel filter

I might as well put a better fuel pump...

TurboII2NV

I am not sure how come u are boosting so much
I got a full custom 3' SS exhaust and intake
walboro 255 fuel pump and still only getting 8.5 psi
(I got an FCD) it will spike a little higher but I want more boost

igottafc

iTrader: (6)

do you have an s4 or an s5 turboIInv? s5's stock ran higer boost out of the factory than s4's did. The only reason why your rear rotors blew that i can think of is that the fuel cut did indeed kick in, but since your were running higher boost pressure, it allowed it to detonate and unfortunatly gave you no mercy and blew both times it happened.

azsuptt

Manual Boost Controller I will post a Picture of the one I bought.

I also Have a TT Supra with a Manual Boost controller and is not as neat and easy to used like the one from Turbonetics I bought for the RX7, wich have a luck to leave it in place an a big handle for increasing the boost

Here is the Link and cost $67, Weard I bough it for 60 at a local dealer Humm I got a good deal and it comes with everything including silicone blue hoses
http://64.225.76.178/main.htm

Digi7ech

iTrader: (1)

Get rid of the boost controller or tune it down to stock boost levels.

The boost controller bleeds off pressure which should be used to open the wastegate. So it makes the wastre gate stay closed longer making the turbo spin faster making more boost.

The series 5 waste gate is a dual opening design and is MUCH better than the S4 design. Toss the Boost controller and see how your doing for boost levels then.

If your still creeping then port the WG.

BTW you probably blew the rear rotor due to running high boost on stock fuel pump and injectors.

gambone

iTrader: (3)

Kid, you got ears and a foot,

azsuptt

Let me add some more facts so you can help me better. The car was running over 12 PSI once I bought it. No FCD, and no Boost controller. Then I blew the motor and rebuild it(Light trim was done to the car to increase HP). 3 weeks later I blew it again(It cost Me $ 500) with no labor since it was under warantee.

Now I'm trying to boost down so I Bough a Botch Fuel regulator (Works with PSI pressure), Change the Fuel filter was completely dirty and put a Manual B controller to try to Boost down to at least 10 PSI with no results.

You just mention that S5 are better than S4, My engine is a 1991 is it comes with S4 or S5, and how much are we talking about to port the wastegate?

azsuptt

To that comment I have to say you are right. I have a heavy foot since driving my TT Supra for 5 years without spending more than $2500 and 395 to the wheels, 12.4 1/4 mile trap at 18 PSI,

I'm a Newbee with rotors and the delicacy and presition of this motors are extreme compare to the 6 Cylinders TT.

Never the less I need to learn, Hopefully not by spending an other $ 500 in rear Housing, Carbons and rotors....

Digi7ech

iTrader: (1)

OK, You said you put a Manual Boost controller ON! Take it OFF. It only RAISES boost.

Adding a Bosch FPR will only add more fuel to your boost in correlation. It in no way reduces the boost levels.

Then You mentioned you had some type of trim done to your turbo. Well the general turbo trim done here is the BNR stage one which will most likley be putting you over the stock injector levels.

You need to find out what your Air Fuel Ratios are.
I am betting your injectors,stock fuel pump are maxing out.

OK, sooooo. Try to find out what has been done to your turbo exactly. Did they do a compressor swap or cut the turbine,etc?

Then you should probably get a bigger fuel pump or rewire your stock unit to run full pressure. Search the forum for fuel pump rewire.

Then get bigger secondary injectors(720's probably) and a SAFC to control them.

You should now be able to use the higher boost without worrying about blowing the engine.

Pretty much it's FUEL before BOOST. The other way == blown engine with our cars. One detonation can destroy the engine.

Your 91 Rx7 is a Series 5 meaning it has the better Waste gate design.

$150FC

When you say "trim" are you talking about clipping the turbine wheel or porting the engine?

you should remove the boost controller from the system entirely. That will tell you how much boost the car wants to run unassisted.

(side note: 395rwhp, 12.4 1/4. Yep, that's a Supra alright. )

tambien, ¿hablas espanol?

azsuptt

Yes I'm 100% Puertorican, and the term is porting the engine?

RX7: Wants to run arround 13-15 PSI without BC,

I will look for re-Wiring the Pump seems like an inexpensive thing to do for now while I try to boost down

There is a restriction I put so much$ on the car and now I'm selling so my budget wil be limited to only Boost down for Now

Thanks for the good advice injectors and Updated Fuel Pump and AFCD will have to wait

Note: About my Supra I expect to do a 12.2 with Drag Radials, intake, Tune up and 21 PSI(stock twins)

JunpoweR

iTrader: (1)

Port the wastegate and all your troubles will go away here is a link =)
http://fc3spro.com/TECH/HOWTO/KWG/kwg.html

azsuptt

Great post, thanks for the Link

ONLY one MORE Question, I promisse

Is it more expensive and reliable buying an external wastegate for my FD or Porting the Stock one.????

Seems to me Porting will be Enough to control the boost level,

Later!!! And Thanks


Picturessssssssss

$150FC

for an FD? I don't know of anyone who has welded an external wastegate onto stock FD twins. The stock wastegate when ported is more than enough.

azsuptt

Picsssssssss

Bukwild

"This weekend I also replace the Fuel filter(I believe this may had have a negative impact on the last motor I blew along with the overboosting, "

Yeah boost controller on stock ecu and stock fuel = 2 blown motors. You need a EMS system. And if you continue to run this setup you will continue to blow the rear rotor.