Congratulations on troubleshooting that unusual problem.

Thanks for posting and keeping us updated.

Take care,
Phil

Need help making power 94tt
 

So tuner thought it was the cooler that blew apart but was just the boost pipe on the cooler that came off.
we battle tonight with the wastgate it just wont open will have to take it off and look at it.
car is dyno halfway just the wastgate that is giving us problems boosting way to much.

Try running the boost straight into the side of the wastegate, just as a test.

Need help making power 94tt
 

wastgate was bypassing vacuum,fixed now hopefully we can dyno her this week with no problems. some random pick i took friday.

http://i1189.photobucket.com/albums/.../Photo0022.jpg

http://i1189.photobucket.com/albums/.../Photo0020.jpg

http://i1189.photobucket.com/albums/.../Photo0019.jpg

http://i1189.photobucket.com/albums/.../Photo0018.jpg

http://i1189.photobucket.com/albums/.../Photo0017.jpg

http://i1189.photobucket.com/albums/.../Photo0016.jpg

http://i1189.photobucket.com/albums/.../Photo0015.jpg

http://i1189.photobucket.com/albums/.../Photo0014.jpg

http://i1189.photobucket.com/albums/.../Photo0013.jpg

http://i1189.photobucket.com/albums/.../Photo0025.jpg

Need help making power 94tt
 

http://i1189.photobucket.com/albums/...115-WA0001.jpg
1.4 bar boost.

Wow - solid run! Time to crank it up with some race fuel (just for a test, of course)...

Need help making power 94tt
 

That was with ethanol will boost her more first want to drive her on the track

Need help making power 94tt
 

The car is overheating very fast wen i race her took out the thermostat but still overheating. so the fan clutch is not working will that cause it to overheat that fast or is it the waterpump.
What will cause the car to miss at so 6000rpm wen i rev her in neutral

It's the fan. Also, be sure to run pure, distilled water (no antifreeze). Use Redline Water Wetter as an anti-corrosive.

Regarding the miss, check your spark plug gaps. How old are your plugs? Are they copper, platinum or iridium? What is the heat range?

Next possibility is the coilpacks - how many miles on them. If not that old (less than 75k miles), purchase one brand-new one, and swap it out for each one of the six till the problem is fixed.

Of course, if your coilpack connectors (plastic) are cracked/brittle, they need to be replaced.

Last (least likely) is the ignitor. Swap it with an ignitor from another Mkiv Supra Turbo to test.

Need help making power 94tt
 

What will the reason be for my powersteering thats noisy after standing for a year

can be a number of things, but easiest check for now would be to rev the vehicle (on park) to about 2k rpm, then turning the wheel all the way to the left until it locks, then all the way to the right till it locks. repeat it several times. the noise is usually due to air bubbles in the fluid. the pump should eliminate the air bubbles.

If however, this does not solve the problem, you may have a damaged line somewhere causing a leak (which would cause air bubbles as well). in a previous post, you mentioned your vehicle overheating, may have damaged some hoses? anyways, we'll start with the easy stuff first and take it from there.

Need help making power 94tt
 

powersteering is sorted out now.can some one tell me right way to test the viscious fan.car still overheating wen driving hard flushed the radiator with new distilled water.am i supposed to be able to stop the fan with my hand wen she is hot.

Glad your PS is sorted out. What was the issue?

Regarding the fan, I've only ever had one go bad. It made nasty-loud whirring sound and was pretty much frozen stuck solid no matter what temperature the engine was at, but I don't think it was overheating - but I also think the owner never drove it hard with that loud whirring noise (if I recall correctly - it was a number of years back). We replaced the fan's clutch assembly (moved the blades from one to the other), and it fixed the whirring noise.

Is your oem fan shroud still in place? How about the thermostat - is that new? ...and is it oem-spec?

Reminder: No one should ever be doing work on the Mkiv Supra Turbo's powertrain without a copy of the Toyota Supra Repair Manuals (TSRMs). I'm sure there's a test for the fan in the TSRM, as well as a complete diagnostic procedure for overheating.

Need help making power 94tt
 

i drained the powersteering and bled it with new fluids.
oem fan shroud is still in place.took the thermostat out thought it was the fault but it was not that.thermostat is still out. I looked in the TSRM but they dont say anything how to test the fan.
Wen i drive normally the heat gauge is half as soon as i boost her the heat goes up wen i drive normal again the heat goes down.

If I were to guess, it's more likely to be the water pump. However, I agree the fan is a possible suspect as well. At this point, I'd say swap out the fan and if that doesn't fix it maybe Toyota will take it back. Either that, or maybe you can find another MK4 owner that will let you swap his fan for a test...

Need help making power 94tt
 

Im also thinking water pump but not sure.it is a lot of work to change it just on maybe but i take it i dont have a choice.
how is it the pump works fine under normal driving and not under boost.
the heater pipes i blank off at the back off the head that cant be the fault

Need help making power 94tt
 

Could it be the headgasket leaking.it is a new oem one with arp headbolts just wandering

Very unlikely, unless there was a flaw in the head. I once saw a head where the chamber had small chunks of aluminum missing everywhere - of course, they were trying to run high boost on pump gas with a single turbo.

Need help making power 94tt
 

the miss on the car got even worse now it misses wen i just rev her changed plugs did not help going to borrow coils tonight to test.will MSD coils be better to buy for my car and will they work with the oem ecu

No, stick with oem coils. There are a couple other alternatives though:
http://www.superspark.com.au/producttoyota.htm
http://mojoperf.com/drupal/node/15

Need help making power 94tt
 

what is beter oem or the superspark.

Brand-new oem coils outperform superspark. However, if you have oem coils with 100,000 miles on them, I suspect the superspark would be at least as good if not better. I'd recommend you go with new oem coils if at all possible.

Need help making power 94tt
 

Im going to buy a set of oem coils and connectors just have to save up some money.Just to be safe what is the best way to get even beter spark what is the best ignition booster to use because i'm using E96 fuel that needs beter spark.

1) With oem 2jz-gte brand-new coils and the correct spark plugs, you could probably set diesel fuel on fire. The 2jz-gte's oem ignition system has proven itself to well over 850hp, with no issues whatsoever. You might want to give this setup a try before you put any money into an ignition amplifier.
2) If you're absolutely convinced you need an ignition amplifier, the HKS DLI-2 Twin Power Ignition is a proven choice. Here's one place you can purchase it:
http://www.mvpmotorsports.com/Templa...207&SearchYN=N

Need help making power 94tt
 

The miss on the car is now even under normal driving.Took all the coils out they all have fine cracks in front off them and 4 connectors is also broken.It is just funny that it was fine on the dyno and 2 day later it started missing.Had it also on the dyno again to see if we can see anything wrong but everthing looks fine.
If the car stands and idle and you rev her,it miss and then revs.
Just making sure it is coils don't want to buy coils and still have a miss.

In my experience, the cracks aren't important at all, but the broken connectors are critical. Please let me know if you need the part number for the Toyota/Lexus coil pack connector and I'll track it down for you.

Need help making power 94tt
 

So you still think it is the connectors that is causing the miss but why was it okay on the dyno.
i'll appreciate the part number.

The street puts more load on the engine, which in turn generates more heat. More vibration could be a factor too. Either way, with new coilpack connectors and new coils I'd bet you'll be fine.

http://mkiv.com/techarticles/parts/c...ess/index.html
90980-11246 Coil Pack Connector
82998-12440 Repair Terminal

http://www.suprastore.com/tosucopaco19.html

Just curious - any news?

Need help making power 94tt
 

Phoned toyota today they say the part nr you gave me for the terminal repair does not exist are you sure that is the right nr.
I bought a 1jzgte enjin for other conversion i want to start as soon as the supra is fixed,anyway i swop its coils with mine it still had the same miss i'm first going to get new connectors to see if it is not the connectors.
Have you ever heard of a supra having problems with its ecu or crank pick up just wondering.

That may be a Lexus part number - please check if your dealer can find it under Lexus.

Yes, the metal 'tooth' plate on the crankshaft can come loose, and/or the magnetic pick-up sensor (or its harness) can be faulty. The troubleshooting steps in the TSRM go through diagnosing and correcting any of these possible issues.

Need help making power 94tt
 

So i swop my ecu,igniter and coils with other ones today and tried a new set of plugs[again] still the same miss.
It leaves me with crank pick up and injectors to test.
I see if i plug out my map sensor it revs a bit beter.

Note: The toothed gear behind the crank pulley/dampener can get knocked off - it's only a press-fit.

Please keep us informed.

Need help making power 94tt
 

Took car back to the dyno my tuner say it is running lean he think there is something wrong with the fuel pump but will keep updated as soon as i know something.

Need help making power 94tt
 

Took the injectors in today to get tested only one was right.
Think it is maybe fake bosch inj.
will buy new ones soon

Need help making power 94tt
 

Bought new injectors car is 100% now.Did a breakfast run today drove her 300 km far no problems.

That's an unusual problem. Did the original injectors you purchased come with any sort of warranty?

Although hindsight is 20-20, would you agree that whenever possible, other forum members reading this should stick with proven-reliable sources for parts (ideally name-brand parts)? I know this is tough when you're on a budget, but (again in hindsight, and for example) bad injectors really could have ruined the engine... Also, please let me know if there's anything I'm missing in this analysis/recommendation/lessons-learned post.

Need help making power 94tt
 

No they had no warranty but yes wen it comes to parts stick to brand names and make sure they are not fakes,specially wen it comes to fuel and timing.

Need help making power 94tt
 

I have 1 or 2 problems on the car that must be fiks it drives fine at 0.9bar but at 1.5bar it feels like the wasgate is opening and closing going to look at that next.
I also had her at the 1/4mile boosting 0.9 why to much wheelspin had 225 semis on the back just to test her.

Please remind me - what kind of boost controller are you using? Also, what is the boost specification of the spring that's in your wastegate?

What's a "semis"? Is that the same as a "Drag Radial"? Also, why only 225 width (that seems pretty darn narrow).

315-width drag radials on 11.5" width rims are very popular here in the US for the strip. Also (of course MT drag slicks).
http://www.bfgoodrichtires.com/tire-...techspec_table
http://www.mickeythompsontires.com/s...hp?item=ETDrag