so here's the deal. i've got an 87 turbo II with a larger downpipe, deleted cats, and a custom intake. when it's cold outside my boost creeps up to 12 lbs around 4500rpm. i've got stock injectors an fd fuel pump and an f-con with the fcd. now whenever it creeps it SEEMS like it has enough fuel (says my narrowband a/f gauge) now i was thinking.....could i get something, maybe a manual boost controller that would let me boost 12 lbs earlier like as soon as it can. but i wasn't sure if when i did that if it would creep even higher because of the boost controller? i hope this is making sense. and do you guys think my 550 primaries would be enough to handle that much power?
thanks-a-million

 

when its hitting 12 it already is hitting it as fast as it can.

 

really? because it spools up to 6lbs from 3000rpm and stays there until 4500rpm. i don't see why it would just sit there like that.

 

are you using the stock boost gauge

 

no. i have a autometer pro-comp boost gauge. and i'm pretty sure it's accurate.

 

how do you know the gauge is accurate?

stock injectors are not enough to support 12psi. and a narrow band will not tell you anyhting during load.

 

are you sure they're not enough, i mean it runs fine. and i know it's not the best boost gauge but i doubt it would be reading OVER what it's actually pushing.

 

wanting boost creep to 12psi? unless you have the necessary fuel upgrades, or just waiting for a rebuild; dont try it. turn boost back down

in my experiences auto meter is hit or miss on accuracy.

 

alright....i guess i'll go over to the rtek forum. i've been thinking about getting one of those once i get a hybrid. thanks.

 

550 cc injectors will be pushing near max capacity just to keep up. what happens if one of them getes clogged? bye bye motor


This is from detonation. you are asking for this going over 8 psi with a stock computer and inj.

 

haha i know what can happen. and i'm not running just the stock computer. so.....what's been going on this whole time? just luck??

 

your asking if stock injectors are okay with 12psi, and you are monitoring a/f with a narrow band under load. Sounds like your lucky so far...

BTW, what are you running for fuel management, i didnt see it above?

 

just an hks f-con and an fcd.

 

YES. So much earlier. you will be at 12psi straight away

no it wont creep higher.


they should be fine with your FCON and a bigger pump.

Im running the same set up

 

How do you know this?


Yes it will. If you're already creeping, it's because you have an insufficiently ported wastegate. How will an EBC affect baseline boost? It won't and you are wrong.

 

> That's a good point. Now what if I'm running 720's on secondaries, but the fuel pump is stock? I have a similar setup as the guy who started thsi thread... minus any AFC of any sort. Pretty much it's just Racing Beat from the turbo all the way to the mufflers, no cats, no emissions, omp and running on premix.

> I was just curious about the fuel pump. Is it gonna be enough when I rail on the gas?

 

You should upgrade the pump before the injectors, not after.

 

No, it won't likely be enough. even on stock injectors, when pushing past stock boost levels, I wouldn't trust the stock fuel pump. If you're looking to start pushing any more boost, I would suggest you get a higher flowing fuel pump (even an FD one will be plenty of fuel for what you're looking for) and do the fuel pump rewire. the article for it is on 1300cc.com. plus, if you're running 720cc secondaries, you should get some kind of fuel adjustment, even a s-afc will help you. because, right now, even under low load, your computer thinks it still has the 550cc injectors, so it won't compensate for the added fuel.

To the other guy: if your boost is creeping to 12 psi but only higher in rpm, YES, using a boost controller will allow you to hit that 12 psi earlier. NO it won't cause you to boost any more or less then stock, because it's your wastegate that's creeping, (not allowing enough gas to bypass the turbine) not the stock boost control. You are EXTREMELY lucky to be pushing that kind of boost with stock injectors and pump. You are going to have your entire fuel system maxed out everytime you get on the throttle. Good rule of thumb: Not maxing out stuff makes it last longer, that's why you start slow in sex. 0

 

> I've heard about using FD fuel pumps. But they're kinda hard to come by and kinda expensive. Any after market suggestions? I mean if I'm gonna be swapping out the fuel pump, I may as well get a new one. I've looked into the Wahlbro In Tank as well as the RP fuel pumps. Any suggestions?

 

No they are actually cheap. Type a post in the 3rd gen section asking for an FD pump. They can be had for < $50. Walbro is another good option. If you're ever planning on going past 10psi I'd just get a Walbro anyways and not worry about an FD pump.

 

^^yup
Got mine for $35 shipped.

 

> I'm just aiming for a modest 15 Psi for now. But out of curiosity, just how high will a Walbro 255lph pump support? I eventually just want something like 300-350 RWHP on my TII. Since I'm mainly using it as a autocross/driftmobile/touge-runner. Anything higher for this car and those applications is overkill from my personal experience.

 

Have you never used a boost controller?
if not, get one. stop being a nana and running 6psi

I still think it wont creep even more. but ive got a ported wastegate.

If the FCON can controll a to4e 57trim turbo with the stock 550's your ***** little stocker will be fine.
Dont underestimate the FCON. old but good.

 

walbro will get you to 350. anyhting past that and you should upgrade to an external.

 

I must have missed the part where the OP said he had a ported wastegate. You know since you're running identical setups and all. Silly me.



And yes I've used electronic boost controllers. They are great for holding the boost solid without sloping off in the upper RPM range, but they aren't going to prevent lag on a stock compressor pushing 15psi. Please take your condescending *** on somewhere, and quit trying to assist people in the destruction of their engines.