Increasing boost on a 91 supra ??

[spanky]

What can I do? How do manual boost controllers work? Is there somthing that you guys are using? I would like to be able to adjust the boost from inside the car if possible. :D

[Supra_devil]

manual boost controller is the best method, not really adjustable in cockpit.
another popluar method is to "shim" the wastegate using washers.
this method works well, at least 2 of our members I know for fact are using this method. again, not adjustable in the car.
Mike has an electronic boost controller, these work good but like all electronics they can develop problems, and this method tempts you to turn up the boost while driving, which can cause its own problems. like cops, or BHG's, or photoradar, lol.

remember that fuel cut is at .95 bar, or 14 psi. although at that point you should looka t retorqueing the headbolts to 75 ft/lbs or going all out for a mhg before going further with a FCD and probably a AFC.

[spanky]

10-12 psi is what I was thinking . I was planning on driving this engine until it destructs and then get a cheep JDM replacement. Any Idea where I can get a manual controller .Any web sites that show how to shim the waste gate? ie shim sizes ectra

[Supra_devil]

well its just washers, lol. most people start at 2-3 washers, gives an extra couple psi. a good thing to invest in if you haven't already is a good boost guage, the stocker isn't accurate past stock levels.
for a boost controller i would browse the boards to see on good deals, or go e-bay, i don't think any places around town have any good prices, this city sucks for aftermarket parts unless you drive a honda, even then its still junk brands.

Also, why get a JDM replacement? Earl has a turbo short block and head for sale, get them, rebuild em slowly, and then when yours get up there in miles or breaks then swap over what you need and put it in, JDM motors need to be rebuilt too so its not saving you any money, and earls is in town and cheaper for sure.

[spanky]

I have seen a few JDM engines that were like new for less than a grand .I have a spare rebuild candidate but you can drop 600$ + just on the cyl head .These were complete with turbo and most parts you would find on your engine. the company is called JDM here in Calgary. A friend purchased one this winter and its like new for 750.00$ but there are some bad ones out there. Calgary has 5 or more companys importing engines so the compatition is good........I am assuming you shim the diaphram away from the turbo to increase the boost .How many shims is a good starting point.As soon as I put the boost gauge in I realized that 7psi was not going to do.

[James Earl]

Here is the link for shimming the waste gate. I would spend the $150 for a manual boost controller as shimming is not a long-term solution.

http://www.supras.com/06/techcenter/display.php?QID=18

I think my block is sold but thanks for the advertising S-Devil. Oh, and the last I heard there was 6 month wait to get JDM motors in. Someone tell me if this is true?

Url

[Supra_devil]

i don't think theres a 6 month wait, they can get stuff in quicker than that, i've called about motors before and they asked which one i wanted, they had 3 in.

[spanky]

5 washers = 9.5 psi .Probally the easiest mod I have ever done. If you want a JDM engine Wait until febuary ,last year they had a lot and you could pick and choose .........Thanks for the info guys

[spanky]

Pole.... what pressure is every one else running ?

[Supra_devil]

i'm running 14.7. i mean atmosphere :( for now :) then it'll be boosting 7 psi on my 5M.

Supra_devil, the soon to be 7 PSI monster mk2. <he hopes

[Sentara]

This has been bugging me. I've read about this countless times, I always here something along the lines of " use 3 washers to achieve this amount of boost ", " use 4 washers to achieve this amount..."??

How thick are these "washers"?? Can somebody clarify? Mike, can you chime in to let us know your results...

I'm thinking 3mm washers...

[Supra_devil]

i agree with sentara, a measurement wold be more accurate.

of course, every car still differs depending on the condition on the wastegate accuator, some are worn and loose are actually letting go too soon, some are nearly new and work perfect.

And natually toytota doesn't sell new actuators.

[spanky]

The washers I used were all differant sizes , but I made sure the stacks were the same size. I will try and measure the stack of washers . 2-3 is a good starting point . It only took me 15 min to instal the first set of washers and even less the second time around .

[James Earl]

I used nuts with the same threading. Gained one psi. I am still looking for leaks before I crank it up. I want to push 10 psi just once before snow comes but I need the time to get it checked before I just crank it.

[spanky]

5 washers @ 3/8th of an inch(10mm) = 9.5 psi boost on my car. heavyEarly87T, Princess auto had boost gauges for 6.99$ a while bach in the surpless section

[Supra_devil]

5 washers @ 3/8th of an inch(10mm) = 9.5 psi boost on my car. heavyEarly87T, Princess auto had boost gauges for 6.99$ a while bach in the surpless section

he already has one.

[GOT_BOOST]

This has been bugging me. I've read about this countless times, I always here something along the lines of " use 3 washers to achieve this amount of boost ", " use 4 washers to achieve this amount..."??

How thick are these "washers"?? Can somebody clarify? Mike, can you chime in to let us know your results...

I'm thinking 3mm washers...

Hi Kevin,

I do not use washers on my wastegate. I am using the APEXI AVCR boost controller. It is an expensive controller but I have found it to be worht every penny when used for for my purpose. I like the AVCR as it helps to controll boost spikes, you can program your boost accordingly and you know exactly how much boost you are running. With a manual one you need to get a boost gauge other wise you will not have a clue as to what you are running. The AVCR allows for gear specific boost, throttle specific boost, scramble boost, also has a self learnign mode so it will know when to give you the maximum boost.

If Spanky is looking for something to set and leave the boost where it is, I would reccomend a manual boost controller with a boost gauge. If he is looking at playing with he boost more, and likes the ease of changing boost accurately, then I would reccomend the AVCR.

Another option is to change your intake and exhaust. I changed my intake the K&N FIPK, the exhaust to the SS Turbo Elbow, RT Downpipe, HKS Dragger Exhaust. By doing the intake and exhaust it removed restrictions and allowed for more air and exhaust to flow more freely. I would reccomend doing these mods first.

There is my chime for the day! :D

Hope this helps.

Mike Nikolai

[spanky]

Mike ever seen a manual controller routed into the car ? Would the lines be too long for acurate control ? ...... I already have 3" exhaust and a cold intake . Soon to be routed behind the right driving light. If I can with out to many problems.

[James Earl]

I have seen that the MBC is usually mounted close to the turbo for best control. This of course means that you have a lot of stop & go driving before it is set. The nice thing is that it is more or less "set & forget". Perfect for me cause I'll just set it for 10 PSI and leave it.

I plan on buying one this winter after I replace some other regular maintenance items on the car.

Url

[GOT_BOOST]

Mike ever seen a manual controller routed into the car ? Would the lines be too long for acurate control ? ...... I already have 3" exhaust and a cold intake . Soon to be routed behind the right driving light. If I can with out to many problems.

Hi Spanky,

YesI have seen a manual controller routed into a car. I have a friend that has a 1986 Nissan 300ZX Turbo with a manual one installed. It is just a knob that you can turn to tighten and release how much pressure is applied to the wastegate via the vacume lines. Mounted inside the car allows for more on the fly boost adjustments, however can also invite too much boost and a blown motor if one is not too carefull. :D

As for the accuracy, it is very accuratre but that depends the accuracy of the boost gauge you are installing. The OEM boost gauge mounted in the Supras is not very accurate. It is in the ball park, but not precise.

Anothe option to consider for increasing boost is an AFM upgrade, if you do this I would reccomend 550 injectors and the Walbro 225 LPH fuel pump and a fuel controller. I have the fuel controller, Fuel pump, but not the injectors, nor the upgraded AFM yet. That was next on my list, but my Turbo has taken precidence! LOL

Hope this helps.

Mike Nikolai

[Supra_devil]

Many of us here know the recommended upgrade lists. i can personally recite most of it. It all depends on how much money you have and what you are willing to do to your car. PM me, Got Boost, HeavyEarly, with a more detailed list of what you have and want and i'm sure we can all show you a good site or list out the upgrades that you will want for you car.

[spanky]

I purchased the car as is to use for daily transportation . I suspect it has a hks head gasket but the previous owner was tight lipped . Some parts were removed before I purchased it .The waste gate had two long vac lines that were not hooked to any thing so I suspect it was some sort of controller. The car was smashed and I expected to have to do some engine work. The limited slip is totally worn out so I suspect its had a hard life.The body and interior are very good . It appears to be stock except for the exhaust , air filter and possibly HKS gasket . I am planning to make the air intake draw cold air from behind the bumper . I would like to make the air tube from the inter cooler to the intake manifold a bit more direct . I would like to make the exhaust a bit quieter . Engine is using some oil , not sure what is the problem .I may switch the turbo and see if it gets better . That is why I may go the JDM route . What ever I need to do to run 10-12 psi boost I welcome your suggestions. Reducing turbo lag would be another desirable out come of any mods . I have a modified Toyota 4X4 so I would like to keep this thing as a daily driver .....Again thanks guys .I should mention that I am a ex Toyota tech.

[Sentara]

This has been bugging me. I've read about this countless times, I always here something along the lines of " use 3 washers to achieve this amount of boost ", " use 4 washers to achieve this amount..."??

How thick are these "washers"?? Can somebody clarify? Mike, can you chime in to let us know your results...

I'm thinking 3mm washers...

Hi Kevin,

I do not use washers on my wastegate. I am using the APEXI AVCR boost controller. It is an expensive controller but I have found it to be worht every penny when used for for my purpose. I like the AVCR as it helps to controll boost spikes, you can program your boost accordingly and you know exactly how much boost you are running. With a manual one you need to get a boost gauge other wise you will not have a clue as to what you are running. The AVCR allows for gear specific boost, throttle specific boost, scramble boost, also has a self learnign mode so it will know when to give you the maximum boost.

If Spanky is looking for something to set and leave the boost where it is, I would reccomend a manual boost controller with a boost gauge. If he is looking at playing with he boost more, and likes the ease of changing boost accurately, then I would reccomend the AVCR.

Another option is to change your intake and exhaust. I changed my intake the K&N FIPK, the exhaust to the SS Turbo Elbow, RT Downpipe, HKS Dragger Exhaust. By doing the intake and exhaust it removed restrictions and allowed for more air and exhaust to flow more freely. I would reccomend doing these mods first.

There is my chime for the day! :D

Hope this helps.

Mike Nikolai

Sorry mike, I knew I should have expected something a little more professional out of ya. :) ...What is scramble boost?

If you want total control Spanky you could build up the engine strong and run standalone.

That is if you have a lot of time, money, and patience to figure out how to work it. That is I believe the most dedicated route.

[spanky]

time and money are always short LOL