Well , I have a power FC .

My low boost setting ( part throttle) is at 10 psi , and my High boost (WOT) is at 14 psi .


I didnt plan to keep these turbos for more then 6 months but well thigns didnt go as planned haha ,

so they may be in the car longer then I expected . granted replacing these with same stockers isnt very expensive But I'd like to keep them for aslong as they will last .

Except I have the problem that I've become somewhat addicted to the power of 14 psi ..

So I was wondering if it would save my turbos

if I ran my boost setup like this , with my low boost being 10 psi . and my high boost 14 , when ever I wanted to go for it .

Compared to say 12 psi constant.

ofcourse I'm not expecting some definitive yes or no , But maybe someone has some mechanical / mathematical theory as to why this would or would not work .

I'm not sure of the RPM's the turbos would spin at any of those PSI range so I cant calculate how much usage they would get .

 

You don't need to know the wheel RPM to know that 14psi is a 40% increase.

Think of it like this. Say I had a job where I was putting out 100% effort (10psi) for 15-20 years. Things are great. Then all of a sudden Management asked to do 40% more work for the same pay. In this economy I would be happy to have a job but eventually you'd burn out and quit, too.

At the end of the day, stock twins could start smoking the next time you start the engine, even if they've never seen more than 10psi. Run it how you want to run it. It's either going to take it or it's not. There's no magic voodoo remedy to make it last at this point.

 

Yeah man, unfortunately there's no exact theory on this. 007 is right. People have had different experiences. I think between me and the previous owner, and we both tracked our cars, I want to say I got between 110,000 and 120,000 out of mine before they were done. Hard to remember. But, for what it's worth, I never ran mine over 12psi.

 

Outside of buying new and keeping things at stock boost.

I ran my car at 12psi with very good condition turbos. They didn't last long for whatever reason. Huge disappointment. If you want more power, I'd leave the boost at 10 psi and upgrade everything else you can and leave it at that if you want any sort of longevity.

 

Agreeing. Another important factor is your IC core. If you have a stock core, 10psi is the limit. It is barely adequate at that level. I think ham sandwich would do a better job. If you are turning up the boost, your intake temps are going to drastically increase which in turn is not good for your engine life. Furthermore, even if you have an upgraded core, the stock turbo's fall from their efficiency drastically after 12psi. Not saying they won't make more power, but they are working much harder to do so.

Pay to play. Power breaks parts and takes money.

 

what this is unacceptable .. new turbos it is!

I already have all the other go fast mods apart from new turbos .

 

Why wouldnt you buy BNRs which make more power and are cheaper? They are new center sections(CHRAs) and not a rebuild. I would never drop the coin for new factory turbos. You can get full single setups for the same or less these days.

 

I'm runing meth / water injection which helps my IAT alot .

I'm very observant of my IAT with my AI my temps are in the 30's C ,

W/O it at 10 PSI my intake temps go to 45 ,

at 14 pIt .. they go quite a bit higher hah like into the 50-60's

BUT at 10 PSI with meth .. it stays at 30-39

 

I didnt mean NEW as in brand new , hah I mean used turbos . I know of a couple places that have good ones for sale for 200


I want hte BNR's but some economic issues came up and I wont have asmuch money to pour into hte car as previously expected . so they will ahve to wait

 

If you want to stick with the twins, I would recommend BNR's. You don't have to go with stage 3's. Their prior stages are more affordable and the upgraded internals will greatly increase reliability.

Why spend money twice? Especially if your twins are still fine for now.

 

BNR funds got diverted to going to rotary rally at the dragon in april . after april I can start saving for them , I just need them to hold on till then! HAH

 

In that case, I would keep them at low boost for longevity.

Ah, the Rotary Rally.

 

more boost on stock twins will kill ur twins twice as fast, I know plenty of people around me who have done this and got the same end results within months. Don't do it unless you plan on upgrading to BNR or a single setup.

 

yeah thats why I lowered it to 10 PSI for low boost rather then 12 like I had it before ,

But I have it at 14 psi . on my high boost ( WOT ) ... at WOT my boost wont stay at 10 reguardless of what I do . I have a full exhaust no cats at all . even with ported waste gate it will creep up to like 13 so rather then have it hit Fuel cut . I just have ti tuned to stay at 14.

13 , and it will creep to 14 in third /

 

Ran my nonsequential twins at 14psi for 2 years. AITs were in the high 20s on on hot English summer day ( not that hot) running on a major extended street port, FMIC, injectors etc. never missed a beat.

Sold the car onto a guy, who ran it for another 18 months and upped it too 1.3 bar. Same turbos. Sold it on to another guy and its going still today.

 

Thanks for all the replies I'll try and not abuse them to-much so they last at least a year haha

 

Am I reading your sig right? Are you running the stock intercooler? If so, that's what supernaut might have been getting at. Efficiency/reliability mods first, then turbos.

I gotta tell you, my favorite incarnation of my car was when it was 99 twins, with all the bolt ons just running 10-12psi. Not the most power in the world, but the most responsive fun car. Everything i've done after that, even though the car is faster, has somewhat taken away from that.

 

I ran 15 psi for more than a decade then turned them up to 17-18 psi. They only lasted about 6 months at 17-18...


I also have a brand new set of stock turbos for sale if yours are bad...

 

Had the stock twins on the car for the 4 years that i owned it. . .ran mostly around 10-12psi. . .ran 20psi once. . .twins had 500,000km's on them. . .they were the ugliest thing when I pulled them off. . .the flapper was almost disintegrated and cracks galore. . .

I've only driven 1 car with BNR's. . .I wouldn't exactly say they're worth the price to but to each their own. . .love the feel of properly working sequentials. . .

 

14psi is more stress than the stock shafts are designed to hold, and more stress on the units overall. Its a gamble. Some people are saying theirs lasted for years, other say a few months or few thousand miles. Is that gamble worth it?

Personally to me, no. I like to have a solid running car, at the expense of absolute power.
To others, yes because they have a backup means of transportation or more turbos ready to drop in. They have a plan B.

Out of interest, what diff gearing are you running? Stock manual?
I ask because it might be possible to keep your stock twins at 10psi, and swap your rear end ratio for something like a 4.44:1 which would give you that urgency and make the car feel faster, while saving your engine and you would get the benefit all through the rpm range. That would be a more worthwhile mod instead of stressing the twins to make it faster. Just change your gearing?

 

I have a FMIC that I'm debating weather to isntall because of engine temps .

 

Very true. At this point, I think going single is wiser.

 

I ran mine at about 13psi for about two years then kaput! They are at BNR right now.

 

Ran mine for 10 years at 12/14 psi never showed signs of any problems