PTE 50 trim 10psi w/ stock SMIC

[Slippi84]

I am in a spot where i am changing my turbo from 14b to a PTE 50 trim but will not have a fmic kit for about 2 weeks. I need to know if 10psi is low enough not to throw crap loads of heat soaked air into my engine. I have a walbro 255 and a AFPR so i can turn fuel pressure up a bit and be ok with avoiding running lean but i'm worried about knock and egt. What you guys think I have my fog lights out and all material around the smic trimmed away so it gets as much cool air rused to it as possible but it's still the stock smic

 

[scottsee]

my recomendation is to double check the compressor map and make sure your at best effency with that turbo. i havn't seen the map for that turbo, but im sure you'll be fine at 10psi.

Edit> looks like 10psi wont spool that turbo up very much. you'll be fine.

 

[oldman]

Unless the 14b is dead, I strongly suggest not to install the turbo until you have all the supporting mods. Fuel pump, AFPR, FMIC, larger injectors, tuning and logging device.

 

[beat90tsi]

Injectors and logger are imperative. You really won't have any what's going on unless you have them. Keep the stock turbo on there until you have those.

 

[Slippi84]

Why oldman that's what i need to know. Like i have heard the possibilty of fuel cut so i say 10psi to avoid that I have heard running lean i have a Walbro 255 and a AFPR so that aint a prob the main thing after that is the air temp which will cause more knock. That is my main worry please give me a reason other that u need suporting mods which i know why it aint gonna work.


I have a datalogger already and 450's are rated to 300 hp

 

[oldman]

Why oldman that's what i need to know. Like i have heard the possibilty of fuel cut so i say 10psi to avoid that I have heard running lean i have a Walbro 255 and a AFPR so that aint a prob the main thing after that is the air temp which will cause more knock. That is my main worry please give me a reason other that u need suporting mods which i know why it aint gonna work.
.

I don't quite fully understand what you're saying here but without a logger, how are you going to know the IDC of the 450s and that you're running lean. Whoever told you that you might hit fuel cut is wrong, fuel cut occurs when the maf reading exceeds the max value programed into the ECU, nothing to do with your fuel supply. The only way you'll hit fuel cut at 10psi with the setup you've listed is if you have boost leaks.

 

[DSM90AWD]

I am in a spot where i am changing my turbo from 14b to a PTE 50 trim but will not have a fmic kit for about 2 weeks. I need to know if 10psi is low enough not to throw crap loads of heat soaked air into my engine.

10psi on a 50-trim would be slightly cooler charge than 10psi on a 14B so heatsoak would not be a problem. Bigger turbos generally flow more air at lower compressor speeds so the outlet temps are cooler.

I have a walbro 255 and a AFPR so i can turn fuel pressure up a bit and be ok with avoiding running lean but i'm worried about knock and egt. What you guys think I have my fog lights out and all material around the smic trimmed away so it gets as much cool air rused to it as possible but it's still the stock smic

You should not have any problems with 10 psi (hell I'd go higher with a bit more base fuel pressure), but would mandate you have some form of datalogger to check knock sums / Injector DC%.


Couple other things..
- I ran out of fuel with my 550s on a 50-trim at 20psi. I now run Denso 660s in the 80% DC range at 23psi.
- Removing that plastic baffle underneath the stock SMIC actually reduces airflow thru the core.
- Unless you're hell-bent on installing the turbo now, I'd just wait until your FMIC came in as you'll have to re-do many of the same install steps.

 

[Slippi84]

I don't quite fully understand what you're saying here but without a logger, how are you going to know the IDC of the 450s and that you're running lean. Whoever told you that you might hit fuel cut is wrong, fuel cut occurs when the maf reading exceeds the max value programed into the ECU, nothing to do with your fuel supply. The only way you'll hit fuel cut at 10psi with the setup you've listed is if you have boost leaks.

I know that fuel cut has to do with the amount hrtz your maf reads and sends to your ecu before it hits the set limit, but I said that's why i run 10 psi to decrease the amount of air. My seperate and diffrent comment about running lean was solved by the walbro 25 and AFPR which i can run like 40 base fuel pressure similar to the 42 i think of a 2g and i would have enough fuel to support that 10psi.

 

[wrx2dsm]

I dont understand people sometimes. You ask for opinions and you get them, from wisemen none the less. You still continue to argue your point about being able to run a 50 trim on stock inectors and SMIC without a logger. Just go do it. It seems that your mind is already made up.

 

[Slippi84]

I am not arguin with the wise man. If my mind was made up I wouldn't have bothered to ask. I am in no way shy or timid about what i want with my car but i wanted to know diffrent technical reasons why most ppl say not to do it, because the same ppl spread hear say like you can't run nitrous w/o blowing up your motor and there is only one way to do things are the first ones to hop on a thread and shoot down an idea because it's not the norm. Now the wiseman made a statment i simply threw out the reasons i think that it might work if there was anything wrong with what i thought he would say so and i would realise why i'm wrong and it won't work. You are a sheep to listen to someone and let them stray you away from what you think just because they has a title such as wiseman or moderator. They are guys just like us just they know more. For this you should respect and take heive to what they say but don't just take everything they say as the end to all. Ask questions be diligent and then weed out the facts and good advice from opinion.

 

[beat90tsi]

You want good advice? Running 10psi on a 50trim with stock injectors is a waste of time, regardless of the intercooler. Just wait until you have injectors to install the 50trim.

This isn't a matter of fact or fiction, these people are trying to help you do things in the right order.

If someone asked whether he could run a T88 on his auto dsm with stock 390 injectors as long as he only ran 4psi, people would say not to do it, and to spend money elsewhere. That doesn't mean it wouldn't work, and he couldn't drive the car like that, it just means it's stupid, and he should spend his money on injectors before a T88, or 50trim and FMIC as the case may be.

That's what people are trying to tell you, don't take it so personally, and tell people that they are sheep because they attempt to learn from the experience of others.

 

[Slippi84]

1 i don't want you guys to think i don't appreciate your info i really do. I'm sorry i have two threads that ask only slightly diffrent things and I thought in this one I had said this before. I am rebuilding the motor and the head is off along with TURBO exhaust manifold and o2 housing. It makes a lot more sense to put the turbo on while everything is off cause i have to break in the new stage 3 clutch and everything else to so it's not like i was gonna go run 20 psi right out the gate anyway. Now I just figured that changing injectors and throwin a fmic on would be easier than takin off my turbo and both the manifold and o2 housing. That is my true reason for wanting to do this i apoligize for not saying this in this thread. Check out my other thread about the PTE 5o trim and you will know where i'm coming from. Honestly i was lookn for facts and info like what DSM90AWD gave me that's all.

 

[wrx2dsm]

Having all the facts makes a world of difference. It really isnt going to save much time in the long run. Do it once and right.

 

[Slippi84]

For any of you doubters saying it wouldn't be worth it, it def was. I'm glad i listened to DSM90AWD I just watched knock and my logs and everything was cool. I don't plan on trying to break any time records with this setup just break in my clutch and rebuilt engine than get my fmic next week and crank it up to 20psi and really have fun. Thanks for your guys input thought it is always appreicated. DSM!!!!!

 

[hellotbone]

I ran mine on the stock side mount but with all other supporting mods at 14 psi for about a month never really had a problem knew it wasn't right risked it and made out ok. You win some you loose some doing things the right way = Just take it easy and you "should" be ok but its still the wrong way of doing things.

 

[DSM90AWD]

For any of you doubters saying it wouldn't be worth it, it def was. I'm glad i listened to DSM90AWD I just watched knock and my logs and everything was cool. I don't plan on trying to break any time records with this setup just break in my clutch and rebuilt engine than get my fmic next week and crank it up to 20psi and really have fun. Thanks for your guys input thought it is always appreicated. DSM!!!!!

Good to hear

Remember that 550s were marginal at 20psi (42 base FP) on my setup (very similar to yours). So before you the boost, may want to ante up for a set of 650cc+ injectors then boost away