Running 20psi on stock injectors?

[tsi1991awd]

I'm wondering, can you run 20psi on the stock injectors or do you HAVE to get bigger injectors?

I was planning on keeping the car stock (91 Talon TSi AWD) but my plans have changed. Ill be putting an Aeromotive AFPR, Walbro 255, intake/full exhaust, front mount. And then get it dyno tuned with DSMLink.

So yea, do you have to have bigger injectors to run 20psi with the 14b turbo (and 16g turbine housing)

 

[cruisintalonawd]

I would you could have detonation... im trying to sell some 510cc injectors if your interested

 

[kiddsm95]

Get bigger injectors because those 450's will lean out at 20 psi.

 

[daren_p]

Think your probably going to run out of fuel. Back when I had an evoIII, I was seeing 107% IDC (obviously not possible) with 15.5 psi. I know the evoIII is a better flowing turbo but at those boost levels your resaults should be fairly similar. Since your going to run DSMLink, you can keep a close eye on knock. If you bump up your base fuel pressure, you may get away with it but your IDC's are still going to be close to being 100%, which isn't recommended.

 

[tsi1991awd]

What size injectors would you say I'd need? 550cc?

And cruisin, pm me a price.

 

[daren_p]

That depends, what are your future plans? They usually tend to grow, even though you may currently think they won't. With DSMLink go bigger then you think you'll need, injectors all cost about the same & DSMLink will make them run like stock. Upgrade once, & go big so you don't have to upgrade again in the future. With DSMLink I would go 750 min, even if you don't think you'll need them. If you think you may want to step up to a 50 trim sized turbo or larger in the future the 1050's are great! But yes 550's should be fine for your current setup.

 

[tsi1991awd]

That depends, what are your future plans? They usually tend to grow, even though you may currently think they won't. With DSMLink go bigger then you think you'll need, injectors all cost about the same & DSMLink will make them run like stock. Upgrade once, & go big so you don't have to upgrade again in the future. With DSMLink I would go 750 min, even if you don't think you'll need them. If you think you may want to step up to a 50 trim sized turbo or larger in the future the 1050's are great! But yes 550's should be fine for your current setup.

Great info! I'll probably do that....who knows, maybe I will want to go for more power later on down the road. But right now I'm looking to do 20psi for a DD. That's kind of why I didn't want to go way overboard with it all.

 

[jrohner]

750's or 850's aren't really any more money than 550's (maybe $10-20), so I wouldn't waste the money on 550's.

 

[delta448]

Fuel requirements depend on airflow and AFR.

To run 20psi on any given turbo will mean different airflow from one setup to the next. Your air filter type, MAF/MAS type, intercooler pressure drop, ic piping, throttle body size, intake mani design, cam profiles, exhaust mani condition, o2 housing design, downpipe size, catalytic convertor condition and cat-back exhaust size all will affect the airflow any given turbo can produce.

For anyone to give you a specific size requirement they would need to know how much airflow you are hitting with your 14b at 20psi of boost. We can all make guesstimates, but since you have DSMLink, just datalog, or spend a few more dollars and get a set you know you'll never outgrow like daren mentioned.

 

[freeman 188]

I am using stock injectors on my 20g at 15 -18 psi and all is good ,but as soon as I turn it up to 20psi it gets the infamous fuel cut . so I think your 14b will get it sooner than 20psi with your 14b . now that I have my link working I will be using my 750cc , these arn,t to big and you have some room to play in the near future , listen to everyone who gave you advice , it is better to go bigger than to buy twice.

 

[Burtismaximus]

I got a set of 550's for relatively cheap on the classified section here so just look around. i run 21 psi with no problems at all. but thats only at the track. so long as you keep using that dsmlink. i dont know what your plans are. im justt looking for 350 to 400 awhp. im happy with what i got though.

 

[Evil_speedracer]

I've run 20 psi on stock 450's before, but not for very long at a time. These guys are right, upgrade the fuel system for sure. I used to run BPR7ES plugs (one heat range colder than manufacturer recommended) to eek out a few extra pounds than I could usually run. Then again, I am also high in altitude so I have a bit higher of a ceiling than most when it comes to a max boost setting. I say don't touch the boost until you are monitoring the AFR, or better yet the EGT. These will tell you where safe boost would be at...or at least give an idea. Then you will be ale to see the changes when you run a heat range colder, and not be tuning blind.