NEw SUPRA

[noel]

Hi everyone

i just bought a 88 jdm turbo 7m-gte 5 speed 91k miles on motor 181k miles on body the PROBLEM is FUEL CUT!!!:cry: i bought the car running 10PSI

stock TUrbo stock AFM stock Injectors .. so i got a MBC to turn it down maybe that would fix the Fuel Cut but noo

Mods

1.3in exhaust
2.Turbo xs BOV
3.Turbo XS Boost Controller
4.K&N [round Filter] [stock intake pipes]
5.Boost Gauge[reads vacuum]
6.Walbro 25 fuel Pump
7. HKS Metal Head Gasket
8.ARP Bolts

NO Check Engine light:icon_bigg
NO Power Steering
NO Charcoal Canister
NO Cat Converters

the BOV is TIGHT %100 so its not leaking
THe intercooler pipes are all TIGHT no Leaks
New Coolant/Hoses/Thermostat
NEw Spark wires/PLugs
NEw OIL/Filter
93octane IT's Entire LIFE

-----my boost/vacuum gauge at idle says 20lbs of Vacuum sometimes it says 19lbs im not sure why is changes
----- the idle is high at 1,300 :nono: [ im guessing cuz of the vented BOV]
----WOT on 1st gear i think it reads like 7psi when i shirt to 2nd WOT it fuel cuts at around 4RPMs
--- every gear minus 1st gear i cant WOT only like half on the pedal which is very retard i dunno :nono:

Conclusion: i cant Run WOT 2nd-5th gear cuz of fuel cut the check engine light turns on when it hits fuel cut and 5 seconds later it turns off

-----------I NEED HELP im NEW To SUPRAs//TURBo"S

 

[Quin]

I cAn TALk k00l 2

On a more serious note, build a boost leak tester and use it. Check your codes, too. You might want to check your ISC, as that could cause the idle problem and the boost leak, too.

Do a search, there are detailed instructions for everything I mentioned.

 

[noel]

wat is isc and where is it>?? how do i do a boost leak tester thingy??!? never heard of theses's things before this being my first turbo car

 

[GrimJack]

Idle Speed Controller.

The boost leak checker is easy to build and just as easy to find instructions for building one here with a quick search.

 

[noel]

Hey guys thanks for the help and input but me and my friend just figured it out today..we noticed that the stock wastegate was "shimmed" we jus took the 5 shims out and now....NO MORE FUEL CUT!

 

[jetjock]

Could have been those 20 pounds of vacuum weighing the car down

 

[89TargaT]

Could have been those 20 pounds of vacuum weighing the car down

LOLZ...

 

[IwantMKIII]

Hey guys thanks for the help and input but me and my friend just figured it out today..we noticed that the stock wastegate was "shimmed" we jus took the 5 shims out and now....NO MORE FUEL CUT!

MAGIC I SAY! Now do you know why this happened?




Hint: Its not really magic

 

[noel]

yea the guy had like 5 washers on each side of wastegate giving it more boost and on top of that the boost gauge was reading incorrect lol so im using the stock gauge and boosting 10PSi safey ....im not sure on the science of the shimming of the wastegate...some care to teach

 

[Rennat]

when you shim it, it makes the spring a lot stiffer, thus making the wastegate hold the boost in longer. if he had 5 washers hes probably doing 14-16psi which is why you were hitting fuel cut... lol


you should post up some pics of the car!

 

[noel]

Ya ill get some pics up and run:biglaugh:ning ...i have another question???:aigo:... now that the wastgate gate is normal i have an MBC, i keep turning it up till i hit fuel cut but the stock gauge says 8psi. HOW do i know exactly where the boost is ???....when i get the after market boost Gauge how much should i be running 8psi?? or 10psi??.........i have an lex AFm and a Fuel pressure regulator that im going to install when i get a day off.... i just wanna know how much PSI i can go with right now cuz right now it's at 8psi

thanxz :icon_razz

 

[Rennat]

i wouldnt install the lex afm until you get 550's. there are HORROR stories of people running lean and blowing up! my friend melted his piston due to this...

lex + 550 = a ok!
les + 450 = not ok! (unless you have a wideband and a fuel tuning device)

and just get an aftermarket gague, and make sure you have the nipple off of the turbo side hooked up to the port on the bov where the ball is, and then the other port to the wastegate... and 10-12psi is what most run, which i doubt you'll notice over your 8psi...

 

[IwantMKIII]

without proper supporting mods you won't be able to tell much of a difference from 8 to 10+PSI. Obviously that guy who owned it before you pushed the CT beyond its normal operating boost levels which cuts down lifespan quickly.

BTW, for future knowledge: Fuel cut IS NOT how much boost you're running, its a given level of air flow at which your AFM reports back to the computer. The more air flow, the closer you are to fuel cut, the more boost, the more air flow. You may hit fuel cut at 16PSI on a CT26, but only 8PSI on another, larger turbo.

 

[suprahabsfan]

Make sure you get an aftermarket boost gauge so you know how much you are actually boosting. It will account for the added boost created by the washers as well

 

[87 Turbo]

i wouldnt install the lex afm until you get 550's. there are HORROR stories of people running lean and blowing up! my friend melted his piston due to this...

lex + 550 = a ok!
les + 450 = not ok! (unless you have a wideband and a fuel tuning device)

and just get an aftermarket gague, and make sure you have the nipple off of the turbo side hooked up to the port on the bov where the ball is, and then the other port to the wastegate... and 10-12psi is what most run, which i doubt you'll notice over your 8psi...

I ran a lex with stock injectors 12 psi for 2 years nothing happen.

 

[GrimJack]

I ran a lex with stock injectors 12 psi for 2 years nothing happen.

How did you tune it? Wideband? SAFC? Adjustable fuel pressure regulator?

 

[Rennat]

because he really didnt have a lex afm... haha

because we all KNOW for a fact if you run a lex with 440's you'll blow the motor.

 

[noel]

took the back seats out they look really dirty and just stock engine pics

 

[noel]

all these's pics are from my camera phone sorry about the Quality

 

[noel]

i need a better camera lol any body wanna donate ! lol