Well I have a 1992 Toyota Celica All Trac Turbo. Well we did engine rebuild (shop did shall i say). We replaced head gasket and complete top to bottom rebuild. Now i am having some problems. I used to live in New Mexico and the car would pull hard as can be at 18psi on stock turbo before with top mount intercooler and no blow off valve stock engine basically. Well head gasket was crap on this engine when we got it so we rebuild it and did front mount intercooler and BOV. Well now the highest i can get the boost is 12lbs. But It feels like it spooling 4lbs. I don't know if its the front mount causing this big lose or if it is something the shop did wrong. Vacuum hoses or something else. And why i cant get above 10-12lbs. We also changed out turbo's to rebuilt CT26. I have old one still. If i want to run 18psi what would i need to replace to keep this steady boost? Injectors, Fuel pump?
Havent ran 18. The car used to push 16 easy. After the rebuild and FMIC im only getting up to 10-11 with boost controller. I was hitting Fuel cut when i was running 16 in third gear fuel cut kit in. Im thinking the shop that rebuild the engine didnt put all the vacuum hoses on right. Want to be pushing about 300whp. What all do i need to change out? This turbo is a rebuilt turbo. I used to have original turbo on the car and was getting Sixteeen. Maybe its the turbo? At point want to get rid of this car and just turbo the civic. Also the bolts on the exhaust manifold to turbo keep coming loose? Would that cause this?
If your car was running 16 then the orginal owner must of have done something to it. Stock alltrac runs 8-10 psi only and fuel cut is at 12 psi. If you were able to run 16 psi and hitting fuel cut thier then something was done to that motor. What ever was done, the shop did not replicate it as its job was to rebuild it back to stock. Also the rebuild turbo you have could be bad. Sometimes when shops rebuild a turbo they do a shitty job. If your bolts are coming off, it could be a warp mainfold or you just need new factory studs and bolts. Why would you want to downgrade to a civic?
Some reasons to keep the alltrac:
1) Rare
2) Handling out exceeds civic or most sports compact
3) Light modifications can produce great amount of power (300+ is common)
4) All the power and handling comes at no lost of luxuary options
5) All the performance and power can be acheive while still being smog legal
Just some quick reasons to keep it.
Example, my stock alltrac which is well kept could run the 1/8 in 9.5~9.6 and thats at the stock boost levels.
Ok having. Dont little bit with the car. I know have NGK 6097 In it. What im curious is. What is the difference between a BYPASS valve and a Blow off Valve? Im thinking this might be my problem.... Bought Greddy BOV/Bypass valve when i didnt know what the hell i was doing. It was pretty Beat up. What BOV should i buy to replace this? Also where do hoses hook up for this and everything to make sure this is hooked up can someone show me some pictures? Will upload some pictures of mine and where the hose is ran to. I think this might be whats messing this up.... the BOV.
__________________
Last edited by 92celicafreak; 11-21-2008 at 05:27 PM.
The bypass valve recalculate the pressure air back into the intake. This is the prefer method as it help keeps the Air Fuel ratio correct. The blow off valve vents it into the atmosphere giving you the whoosh sound when you boost and lay off the gas. The reason the bypass is prefer is because once the air has gone through the MAF it has already been calculated in the amount of fuel to be injected into the system. So the bypass helps keeps the measured air in the system while the blow off valve vents it out and can cause the car to run slightly richer.
The Greddy BOV which is spring loaded tends to leak due to the week spring or over time which can cause issues. You could upgrade the spring to a tighter one which is provided by greddy or change the BOV to a HKS unit which doesn't have that issue.
The unit is to sit between the turbo and throttle body. The alltrac being a TMIC (Top Mount Intercooler), you'll will not have much option as too where it goes. You can drill and weld it onto the intercooler or use a T hose between the turbo and intercooler. Either way the proper mounting unit must be bought along with the BOV. As for the vacuum source you'll need one after the throttle body. Lucky us the 3S-GTE motor has two extra vacuum nipples found behind the intake manifold. The one to the left is used and could be T to the BOV or use the right one which is free and not in use. It is prefer to use the Right one as it is closer to the BOV location and is free of other sources using it.
Sorry I don't have pics, and currently my car is nicely store away in the garage under the car cover, waiting for next weekend drive.
Which HKS is best for Performance? Going to buy i need PN to please of product? DOnt care price. So a BOV is Atmosperic which makes it run rich right? So i would want to go with Bypass valve right?
__________________
Last edited by 92celicafreak; 11-21-2008 at 06:39 PM.
Check this image. You'll that on the intake manifold there is two nipples, one to the left and right. The left one there has a black rubber cover for it while the left is left open. This is where you will hook up the BOV too as it is the best source to use. Again on your car, the one too the right in the picture will be currently used while the right one is going to have a rubber protective pieace around it.
So does your car have a boost controller that you know off? Could of been that the who ever had it before had a manual boost controller installed and you didn't know. Again stock the car should only be running 8-10 psi.
I have a Apexi Boost Controller. No manual one in i have tried disabling tvis system with it and with out i dont notice a difference. But i dont understand duty and everything it may not be setup right.
Right now according to boost controller normally hitting .87 bar which is 12psi. Some times i can get it to 1.1 bar. Which is 15.9 psi. Im thinking that the other turbo maybe had been upgraded..... Its in my garage how would i know?
From the sounds of it you don't know too much about turbos and their setup. Aftermarket or not, the turbo is regulated by the Wastegate in which the boost controller adjusts it. The wastegate is set to factory stock which is 8-10psi and the apex controller will override it. You have to make sure you've installed the controller correctly. I believe the shop that rebuild your engine did not do it as that's not part of their job. Also since you've gotten a new turbo and rebuild your engine, you'll have to recalibrate the boost controller as the engine is now running different. The TVIS has nothing to do with the boost controller so I have no idea why you're even messing with it. After you have correctly installed the controller, you'll have to make sure you have all the settings correct for it to work correctly. The CT26 on the 3S-GTE has two vacuum nipples one connected to the snail of the turbo, and the other to a vacuum pipe that leads to a pressure sensor. Make sure your connecting using the one to the snail and you'll want to plug the other one. If you don't the stock system will kick in and boost will be back to stock.
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.
ToyotaNation.com is an independent Toyota/Lexus enthusiast website. ToyotaNation.com is not sponsored by or in any way affiliated with Toyota Motor Sales, USA, Inc. The Toyota, Lexus and Scion names and logos are trademarks owned by Toyota Motor Sales, USA, Inc.
Forum for all Toyota Celica discussion! Including the ST16x/18x/20x, and ZZT230/231.
Linear Mode
