TO4 turbo not boosting right
 

Ok I finally put in my t04 turbo in. Its mounted on a s5 manifold and a custom adapter piece. I am running with NO WASTEGATE for now, until I can get one. I'm using the stock intercooler and a 1g dsm bov. So i go out to test drive it and gradually get on it to see how much boost will be produced and I get on it all the way and only get like 6-7 psi of boost. With no wastegate the turbo should be running full boost somewhere between 20-30 psi. I checked all intercooler piping. Why am I ONLY GETTING 6-7 PSI? Maybe a bad afm? any ideas?

most of the big turbo guys on here dont like to see people half ass things. It seems that you are half assing things...

I hope you find your answer, good luck. But hitting "20-30psi" will pop your motor unless you are setup for it... that mega boost. you dont have any of needed fuel mods to run the kind of hp you will put out but a walbro.
Man dont pop it.

i would like to see a pic of your "adapter piece"...

Wait a minute.... you mean you have the wastegate passage on the turbine housing blocked off???

Just how do you have this hooked up????

and.... you are gonna blow that car up REAL quick... I don't see any extra fuel control in your mods.......

The turbo doesn't have a wastegate passage on the housing, its built for an external wastegate. I was planning on just driving it normally, because i need a car for work and school.

I don't have a pic, but it's basically a hollow metal housing with a t04 flange on one side and the s5 flange on the other side. It's been professionally done by the best welder in town. I wasnt planning on halfassing it but with the stock turbo blown and the car just sitting there, i needed a car for work and school so i did it half assed

20-30 PSI on a TO4 is going to put you around 400-470hp I think so I would NOT go there at all. My first and only priority with your problem would be to GET A WASTEGATE LIKE YESTERDAY and after that make sure you get some large injectors.

What I meant by 20-30 psi was that an ungated turbo should be running full boost. I dont plan on boosting that high ever, only like 10-12, my problem is that I am only getting 7 psi on an ungated t04.

Maybe your "adaptor piece" is a restriction. No intercooler and no wastegate seems like a terrible idea so I wouldn't even try to see boost at all right now anyways.

if you're still running an AFM and stock exhaust you're not going to boost much, even with the T04 compressor side. Furthermore the stock s5 turbine side probably will be too restrictive to run "20-30 psi".

you need to read up some more, it doesn't sound like you have much of a clue what you're doing.

hes running a full t04 from the sound of it, just made some sorta adapter to the stock manifold???

WAIT....... you still have the cats on that thing???????

If so.. you may be getting too much backpressure from the exhaust system for the design of the turbine wheel and boggin it the hell out.

Especially if the compressor wheel takes a bigger bite of the air than the stock one.... Ie... it builds more pressure, but is also a bit harder to turn.

I understand what you did. Adapter plates are a cheap solution to a brand new manifold. As to problems, I assume it's a vac leak. You have a gasket in there from the flange to the turbo I hope. :) Unless the flow is THAT restricted that it can't flow anything over 7 psi, which I guess could be possible... If you are running stock exhaust. Those cats are probably all nasty and dirty and very restrictive. And the stock intake box can't be helping either. :)
All that combined with no w/g and still running tmic, DO be careful... You're playing with fire if you can get that sucker to spool up hard.

Er, Ok, I misread the post.

What kind of exhaust do you have? That will make a huge difference.

Regardless of why its not spooling... get lots more fuel, something to controll it, a fmic and some timing retard.. maybe the realtec7 ecu chip. The stock boost sensor is only good to 1 bar tho. So it can only handle the timing retard till then. You could always retard at the CAS 1deg per LB over like 9 or so to be safe.

I dunno if a safc can tune down the kind of injectors your gonna need for the power a full to4 will make.... standalone time.

I didnt mean the halfass comment was about your mcgyver turbo mount... it was about putting a to4 on a car thats only modded for 11psi on the stocker.

Im willing to answer any questions you may have about what you need to do. Sorry if some of us came across as a bit rude.. but i have seen so many posts like yours and then a week later a post about how they blew the motor and are selling the -7-... Dont be that guy.

just ask
jaared

ok guys, as for the exhaust i have a 2.5 in downpipe to the stock exhaust with gutted cat. I know all about not having enough fuel, too much boost will blow the motor. What i need is help in answering my original question, Why am I not running more than 7 psi on an ungated to4. PLEASE NO MORE REPLYS ABOUT FUEL UPGRADES AND BLOWN MOTORS.

well i refuse to help with your problem anymore till you get the support mods needed. Your putting the cart before the horse.

you shouldnt be running more thna 7 or 8 psi on a to4 with your setup anyway.

So what exactly are you trying to do? Make it boost too much then go back and get the mods to support it?

Good luck... invest in a compresstion gauge.

jared

i was just gonna drive it normally for the time being, but when i saw that as i gradually got on it i was only getting 7psi. Isnt there something wrong here?

i take it back.... make a block off plate for your WG flange. Block that shit off. Then go for a few WOT runs...You will get your boost.


**Take note i am no way responsible for damage done or problems caused by taking any advice that i give or imply in this thread from this post on. If you do not agree to those terms do not follow my advice.**

there is no wg flange, the turbo is built for an external wg

the external WG bolts to a flange on the manifold.... ohh riiiiight stock manifold... hmm ok. 3" tid, nos, unbolt your catback, ect. with no boost controll at all you should be boosting lots.. hmm maybe you should take out a title loan on your car for $250 and spend it on 250 orders of wendys nuggets.

I dont see the humor in what your saying man.

boost fluid is low?

You are getting pretty annoyed by the responses here but basically here is my 2 cents:

If you are runing 7 psi at most on this setup you are damn lucky. I would walk places before I'd drive a car set up the way your car is set up right now. You have no means of controling boost... That being said: I know people who run about 10 psi no problem with hybrids on the stock IC so you are probably not seeing anything wrong there. Maybe the BOV is stuck open? I dunno if that ever happens commonly but it would be worth checking I guess. Even on the stock AFM you should be able to push more boost than that. I know people who have pushed a bit more on hybrids without stand alones. With gutted cats you're probably flowing enough to the point where you can boost higher than you do.

I really resent giving you any constructive input on this because of how bad of an idea what your doing is. We're not trying to be bastards here when we say that this is just a terrible idea and nothing good is going to come of this. I seriously wouldn't ever set it up this way but if you're really hell bent on driving it, I wouldn't screw with it. All you're going to need is a touch of boost creep and you're in a hell of a lot of trouble. Maybe you know this, maybe you're convinced it wont be that bad, but seriously, I wouldn't screw with it until you could at least get a WG on there and even then, you've got a few hundred dollars in crap beyond that you need still....

You totally bought the wrong car if you really think TESTING(WOT) your UNWASTEGATED, UNFUELMODIFIED, UNECU-UPGRADED, STOCK IC, TO4'ed, T2, is even CLOSE, to a perhaps, somewhat, minute, level-headed thought. Your car shouldn't even be off jackstands the way you just described it to us. If you need this car as a daily driver, BUY ANOTHER ****'ing car, ESPECIALLY if you are going to mod it only half way with the intent of driving it. Buy a bus pass, or a bicycle, you wouldn't fly in a plane with only one wing would you? Then why drive a car with only half the setup necessary.

Sorry if you think I am an ass, but your total lack of interest in the risk that you have ALREADY put your car into is absolutely astounding.

--Fritz