pte 52 w/stock chip and injectors

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dpw41285

Spoolin'
Heres the deal,

My pass manifold is cracked and obviously i have to tear everything apart to fix the manifold. My question is how much boost is safe with a pte52 and stock tune/injectors. I will be picking up the turbo this weekend and see no point in doing this twice. I have an external gated downpipe that i got from rpm. I have not purchased the gate yet. I was wondering if 12psi would be pushing the limits of the injectors. I know the stock ecu will read up to two bar so we are good there. Just want to install the turbo once and then get tuned and crank the boost this summer. I can even stay out of the throttle if need be, just looking for opinions...

thanks
 
TYTILIDIE

TYTILIDIE

METH HEAD
Re: pte 52 w/stock chip and injectors

dpw41285 said:
Heres the deal,

My pass manifold is cracked and obviously i have to tear everything apart to fix the manifold. My question is how much boost is safe with a pte52 and stock tune/injectors. I will be picking up the turbo this weekend and see no point in doing this twice. I have an external gated downpipe that i got from rpm. I have not purchased the gate yet. I was wondering if 12psi would be pushing the limits of the injectors. I know the stock ecu will read up to two bar so we are good there. Just want to install the turbo once and then get tuned and crank the boost this summer. I can even stay out of the throttle if need be, just looking for opinions...

thanks
Click to expand...

Unless you have a way to increase fuel under boost I would stick 8-10psi, maybe even 6-8. Either way your truck shouldn't run right at all. Maybe under normal driving but unless you have a higher stall than stock you aren't going to spool that turbo up at a light.
 
JSM

JSM

Active member
Re: pte 52 w/stock chip and injectors

How many miles and why are you planning to drive it with a big turbo and no tune?

It needs tuned IMO, plan and simple. If I was doing the work I would have a new tune in before I even started the truck, and on the laptop ready to make changes. I understand its not possible for everybody to do that due to knowledge, etc.

If you need to drive it 30 miles somewhere to get tuned you might make it work somewhat safe if you turn the FP up some and stay out of boost.

My opionion is 0psi is safe, 1psi your starting to take a chance.
 
cloneman315

cloneman315

Active member
Re: pte 52 w/stock chip and injectors

problem is no one ever stays off the pedal like they should or say they would,that is why the blow up!The chip I ran was a great 52 chip but it was for 50#inj and was open loop,maybe start reading into code 59.I have not played with it because my old set up works well,but a lot of guys like it I hear.
 
TYTILIDIE

TYTILIDIE

METH HEAD
Re: pte 52 w/stock chip and injectors

cloneman315 said:
put some 50s in it,I ran 25 psi on stock motor with race fuel on a 52
Click to expand...

He could spend that money on tuning tools and get a lot further. Even if you consider he needs to buy a bunch of other crap anyway you can never go wrong having control of your tune:2cents:
 
cloneman315

cloneman315

Active member
Re: pte 52 w/stock chip and injectors

If he bought the chip he should not need to buy any tools,just a wbo2,datamaster and the common upgrades,which for some people that dont want to buy tunning tools etc is a better route.I personally know that the 50# pound chip i am talking about is very very good,but keep in mind every truck can be a bit different.
 
turbodig

turbodig

Active member
Re: pte 52 w/stock chip and injectors

Generally, I'd keep it under 5-6 psi, and stay out of boost as much as possible until you can get it dialed in.

Too much boost, too big of a turbo, and too small of an injector = dead motor.

Even with everything tuned correctly, you won't likely be able to handle much more than 15-16 on 91-93 pump gas.
 
cloneman315

cloneman315

Active member
Re: pte 52 w/stock chip and injectors

Like Dig said,just playing with them stock inj is not a good idea!And I ran no more than 15 on 93 oct.
 
D

dpw41285

Spoolin'
Re: pte 52 w/stock chip and injectors

i do have a bigger stall (see sig)
my only question how is 8-10psi on a pte52 with stock injectors any worse than 16-18psi on stock turbo stock injector?

i do not plan on driving the truck this way i just want to be able to move it in and out of the garage and to my buddys shop on the other side of town.

i daily drive this truck and only build boost when i want to. i drove a whole tank of gas out of boost...well there was that one time i was merging and built 2lbs lol

not doubting anyone just trying to clear things up. i will buy a chip once i am done ie: vortecs and 415 +50lb injectors. This is just a prevenitive step so i am not back tracking. Code 59 may be the way to go so i can change my tune for the mods at that time.
 
turbodig

turbodig

Active member
Re: pte 52 w/stock chip and injectors

dpw41285 said:
i do have a bigger stall (see sig)
my only question how is 8-10psi on a pte52 with stock injectors any worse than 16-18psi on stock turbo stock injector?

.
Click to expand...

It isn't. They're both bad.

16-18 psi on the stock chip and stock injectors with a stock turbo, on commonly available pump gas, will kill a motor eventually. How fast, depends on a lot of variables.
 
D

dpw41285

Spoolin'
Re: pte 52 w/stock chip and injectors

will have to put a wideband on it, i will just hold off on spirited driving untill the tune is complete
 
Quickstop [UK]

Quickstop [UK]

Combating adversyty.
Re: pte 52 w/stock chip and injectors

is it a stock engine? If you are just putting a turbo on then at the same psi the engine is flowing the same air so your stock injectors will be good up to the stock limit of 14.7 psi.

Only when you go past this limit will you need to worry. The engine will sense the pressure and fuel accordingly. Doesn't mean it will run right though.
 
turbodig

turbodig

Active member
Re: pte 52 w/stock chip and injectors

Quickstop [UK] said:
is it a stock engine? If you are just putting a turbo on then at the same psi the engine is flowing the same air so your stock injectors will be good up to the stock limit of 14.7 psi.

Only when you go past this limit will you need to worry. The engine will sense the pressure and fuel accordingly. Doesn't mean it will run right though.
Click to expand...

Not true. For a number of reasons.

If a different turbo doesn't flow more air, or improve the density of the air it compressed (ie, is heated less), then why put it on?

The reality is:

A larger exhaust/turbine will flow more exhaust. This means less backpressure in the manifolds and ultimately, less reversion.

A better compressor section will pressurize the same 14.7 psi, but will do it with less heat. (greater compressor efficiency) This increases air density, requiring more fuel.

A larger compressor/inlet/cover will be less of a restriction to incoming airflow.

I see this over and over again... guys want to put a bigger turbo on, but expect that it will run ok with the same fuel calibration it had before.

This assumes 1 of 3 things:

1) Your existing calibration (chip) was considerably overfueled to begin with. (Which isn't often the case)
2) Your new turbo isn't moving any more air (from a lbs. of air standpoint) than your previous one. If that's the case, your upgrade didn't do any good.
3) The ECM will "sense" the additional air and will correct for it accordingly. (It doesn't, and won't)

If you improve airflow, you *must* add fuel to maintain a good AFR.

This usually leads to another big assumption, that you can buy a chip from someone who had the same turbo and injectors, and it'll work ok. There are many dozen failed motors that can attest to the validity of that assumption...
 
JSM

JSM

Active member
Re: pte 52 w/stock chip and injectors

Dig WTF do you know about tuning, its all plug and play just like the buick world.
 
D

dpw41285

Spoolin'
Re: pte 52 w/stock chip and injectors

Quickstop [UK] said:
is it a stock engine? If you are just putting a turbo on then at the same psi the engine is flowing the same air so your stock injectors will be good up to the stock limit of 14.7 psi.

Only when you go past this limit will you need to worry. The engine will sense the pressure and fuel accordingly. Doesn't mean it will run right though.
Click to expand...

i new better than to assume this..

the bigger turbo will produce less heat and mor cfm at the same psi, that is why i figured i would be okay @ 10psi
 
dgoodhue

dgoodhue

BuSTeD 4.3
Re: pte 52 w/stock chip and injectors

dpw41285 said:
i new better than to assume this..

the bigger turbo will produce less heat and mor cfm at the same psi, that is why i figured i would be okay @ 10psi
Click to expand...

The stock ECM doesn't measure CFM, it measures pressure. So 10 psi with less heat means a denser mixture of Oxgen but the ECM doesn't have any tools besides IAT to adjust this.
 
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