hey guys i got a auto TT and i installed a downpipe and a thermal exhaust... now the problem is, now when i go it feels strong on the low end but when the car gets to about 5K RPM the car juss seems to lose power and cut... now i know you guys are gonna say i need the greddy BCC!! but i already had that installed so thats not the problem... ALso with those mods what should i be boosting at>? because on my boost gauge i only get to about 10 PSI max, you think somethings wrong? because shouldnt my car be boosting at at least 14 PSI with the DP and exhaust? please help someone?

Replace your spark plugs.

Looking for Supra....

I got the same Problem, what should the heat range be and the gap?

if you think that spark plugs are your problem (which it most likely is), then get ngk 3330's or ngk 6097's. they come gapped to where you would want them to be.

which are better?

in my opinion, they are both the same. ive had 3330's for a long time and 6097's also for a long time. no difference what so ever in my car (94 auto tt bpu+++). also they are the same price.

IK 22's from Denso are also very good. Gap them at around .032".

-Olivier

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I guess I'll be surfing here until...I get tired of it!

unless you install something to up the boost yourself (boost controller, or vacuum "T" mod) the boost is going to stay the same no matter what you do. Of course its not going to boost past 10-11psi because that is the stock setting. Get a boost controller, or go to MKIV.com and see how to do the bleeder "T" mod. I have the bleeder mod, DP, HKS superdragger and boost to 16-18psi all day long...


"Got Boost?"
94 Supra TT
95 Dodge Ram on Air

you should hit 15psi easily with a dp/exhaust.... check for boost leaks, and change to Ngk's,....

quote:

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Originally posted by LadyDeATh:
you should hit 15psi easily with a dp/exhaust.... check for boost leaks, and change to Ngk's,....

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How are you going to hit a higher boost without a boost controller? It doesnt raise itself automatically when you install other parts...The wastegates open after 11psi. SO unless you have a boost controller, or the bleeder "T" you arent going to boost over 11psi. DONT SPEND ANY MONEY UNLESS YOU GET THE BOOST CONTROLLER. You could change plugs and stuff all day long, its NOT going to raise your boost....


"Got Boost?"
94 Supra TT
95 Dodge Ram on Air

lastlookcustoms,did you miss the part about poor info????DONT SPEND ANY MONEY UNLESS YOU GET THE BOOSTCONTROLLER.Umm no!why wast money on a boost controller when you can 1st remove the plugs check and gap 2nd check for faulty actuator, both at no cost.

By the way a DP/exhaust will raise boost,i have only got a DP/exhaust and my car hits the boost cut often.

IF YOU DONT KNOW DONT POST

Ok, I highly doubt its a wastegate problem or a plug gap problem because he is still boosting to the factory spec. If it WAS a wastegate problem, he would still be building pressure, it would just feel like tremendous lag from the start. Also, I dont know how your boost went up with the adding of a DP and exhaust. It will up your HP, not your boost. I have all the stuff added to mine, and never boosted over 11psi until I added the bleeder "T". Are you sure YOU are getting an accurate boost reading or do you just THINK you are hitting boost cut? Unless you either alter the computer (adding a boost controller) or alter your wastegate hoses, the car does not mysteriously build more boost. So I dont know about false info, but it sounds like its coming from you....


"Got Boost?"
94 Supra TT
95 Dodge Ram on Air

I dont remember giving any info,just some advise to chek things before he wastes money on unnesesary parts. If there was a faulty actuator the car could easily build boost on the first turbo then not have the second come online. This would feel like a power lose.
The easiest way i know to check this is to wire the actuators open. If the boost increases then i would asume that it is a faulty actuator.
I just belive that if you are trying to problem solve do it as cheap and easy as posible, once you find the problem you will then have more money to fix it. Always cheack the simple things fist.

I understand that you are trying to give him problem solving methods, but there probably isnt a problem to solve. If he doesnt have a boost controller, he is NOT going to boost past 11psi, PERIOD... If he has a boost controller, and turns it up and doesnt boost over 11psi, then he has a problem. But I believe his original post said he was wondering why he went BPU (supposedly) and couldnt boost higher than 10psi. He could add exhaust, DP, intake all day long, but unless he uses a device (either MBC, EBC or a bleeder "T") the boost is not going to rise. Its as easy as that. So if you are wondering why you boost is rising, and you have yet to add a boost controller, thats your problem. So maybe you should invest in a boost controller, or a dollar on a bleeder "T" and try that.... If you are close to CT, stop by and I will do it for ya for nothing to show you what I mean...


"Got Boost?"
94 Supra TT
95 Dodge Ram on Air

I would like to take you up on that offer but CT is a bit far for me.I dont know all that much about cars but i know that i had a boost tap , but once i added the d/p there was no need for it.May some one else could shed some light on this.

Olivier caza???Does adding a d/p and exhaust raise boost?From all my experiences it does.

Maybe we should ask Tozer. I know that the boost cannot raise without some sort of controller. It just doesnt rise with the addition of dp/exhaust. Mark, can you shed some light on this...


"Got Boost?"
94 Supra TT
95 Dodge Ram on Air

Lastlookscustom, you are dead wrong. My car used to hit 21psi on cold nights with no form of boost controller or boost mod. EVERYONE else I have talked to has seen higher than stock boost. The car doesn't have any type of boost controller or boost setting built in stock. The turbos don't boost any higher than 11psi stock because they are significantly restricted by the stock exhaust and intake (intake not so much). If you have boost controller try turning it off and seeing what happens. If its very cold out you will still hit high boost. The reason why the wastegate opens stock at 11 psi is because it doesn't have enough exhaust power to hold open at those pressures.

As for the problem, I would first check the plugs but I doubt that is it unless you are just getting a small stumble. Also check that your BCC is set properly. it has adjustable voltage so that you can control when boost cut comes. Most people set it so that it never comes though. Did you play with the voltage when it was installed?

If that stuff doesn't work just put your car in TTC. That will completely bypass the actuators and everything involved with the stock sequential system. If your car runs fine after that then it is an actuator. Good luck.

If none of that works there is a possibility it is a lzy wastegate or your second turbo is going. Are you getting smoke? Death whine?

BTW, check out www.mkiv.com for info on TTC and if its the wastegate you can just do the hanger trick to get it to stay closed.