12psi

if you have all the right mods you can go higher, I ran about 14-16psi, with an occasional spirited 18psi https://www.nopistons.com/forums/pub...IR#>/smile.png

I havr run mine on 16 psi before. I even did that on stock fuel maps with no blowin up! https://www.nopistons.com/forums/pub...DIR#>/ohmy.png



I wouldnt recomend it though https://www.nopistons.com/forums/pub...DIR#>/wink.png

12

I'm leaning around 12~13 psi. Higher than that and the turbo's will work their ass off....which of course shortens their life substantially.



Just go single turbo and be done with it. https://www.nopistons.com/forums/pub...1047683329.gif

Humm.. 12psi.. so, is there any point to run a single turbo if you're going to stay at 12psi or under? (sorry that was off-subject)

Thank you!!! thats what I keep telling people!! 12psi is 12 psi I dont care if you blow it through a straw or a leaf blower!! I like the sequential setup because you dont have the lag from the single.. the twins are more responsive. I'd only go single if I had atleast 850s all around, atleast a street port and some 3mm seals then I'd boost that mofo to 17psi and let it rip. (obviously you'd need a fuel map for your ecu with this setup you'll need more fuel https://www.nopistons.com/forums/pub...IR )

12 psi on a single will make more power then stock twins at 12 psi, thats why

I don't get how... https://www.nopistons.com/forums/pub...IR#>/blink.png

the single turbo's are more efficient, and efficiency = more power. those little twins are struggling to push 12psi so you see some losses, whereas on a big wellmade single 12psi is child's play for it. at least thats how i always thought of it.



kevin.

I just don't understand how 12 psi can differ from 12 psi in any way? the twin turbos seem more efficent at lower boost since you have little to no boost lag from the seq turbos. Doesn't the larger turbo of the 2 push 12 psi and the smaller one runs at a lower boost to eliminate turbo lag? If so, then you're still hitting 12 psi which according to all these ppl is safe on the stock turbo.

Think of it like this:



The stock turbos are like a coffee straw. You can push 12psi through a coffee straw but there won't be a large volume of air. A single turbo is like blowing through a regular straw. Its still 12psi but its alot more air. More air = more power https://www.nopistons.com/forums/pub...1047683329.gif

It depends on your turbo maps wether or not a particular turbo will make more power than twins at lower boost. A large single turbo won't make as much power at 10psi as stock twins at 10psi. A smaller single turbo to medium sized turbo will defenitly make more power at 12psi than stock twins at 12psi. Then once you get to 15+psi the single will make tons more power than the small twins. The stockers being so small have to spin much faster than a larger turbo, hence putting more stress on them. My friend who installed my apexi turbo is running 12psi and the power difference from before to now is very noticable. He even still has the stock intercooler. The turbo spools just as fast as the twins, makes more power, more reliable, less heat, and looks much better.

No disrespect...but you guys have it all wrong 12 psi is 12 psi end of story. If you would like references on this by all means ..... Call Cam at Pettit or Bryan at rotorsports racing

I'm done with this thread...I agree with this guy's sig

34 people calling a horse a dog doesnt mean that a horse is a dog.

12 psi is 12 ps anywhich way you look at it.

I like his sig too https://www.nopistons.com/forums/pub...IR#>/bigok.gif



12psi is 12psi on any kind of turbo. However there are different trims, compressor and exhaust sizes that effect cfm. Kinda like on Brians 1st gen, he has q trim on a turbo with a .7 compressor and a 1.0 on the exhaust, while I have a P trim. If I were to run 12psi and Brian were to run 12psi he would make more power than me cause his turbo trim allows him to flow more exhaust.

https://www.nopistons.com/forums/pub...1047683358.gif Agreed 12psi is 12psi no matter how you look at it. The difference in CFM between a single and twins, even at the same boost level, is where the extra power comes from.



No arguments here, just stating facts

Ok... First of all YES I AM AN IDIOT. So let me be goddammit.



Question: If in Non-Sequential mode (As the turbo's are after 4500 RPM, provided that the primary turbo makes 8psi) : Don't the turbos make a COMBINED psi? Like 12psi = 6psi per turbo? How does that seem to kill these stockers? Is 6psi THAT much for one of them?



Here's why I ask this...



The primary turbo, on it's own, makes 10 psi until transition... If the primary turbo can handle 10psi all by itself... why can't they (BOTH TURBOS) handle 20psi together?





Sorry for the NEWB question... I was always scared to ask that one on the other forum... afraid of getting banned.



https://www.nopistons.com/forums/pub...#>/biggrin.png

Well I gotta talk to Vosko about this one. Just be warned you are probably gonna get banned by tomorrow sometime https://www.nopistons.com/forums/pub...DIR#>/wink.png

you know........... i've always wondered that......... 10psi + 10psi = 20psi right

Yeah... But when they transition... they make 10 together.... I just can't figure out how if the primary can do 10 on it's own... why combined they can't do 20.



I do understand the manifold won't flow that, and that's HELLA heat... I just wanna know why 15 seems to fry turbos... Dosen't seem logical!



https://www.nopistons.com/forums/pub...#>/biggrin.png

LOL...



SHIELDS ON!

I think that basically the primary turbo has a different trim wheel or different A/R then the secondary. Thats why the primary can do 10 psi. When you crank up the boost it does combine it proportionally between the primary and secondary. I have no idea though I'm just guessing about that.



The major killer is the heat and the RPM. They don't like 100,000+ rpm for extended periods.

so they're not high rev loving like hondas at a stop light?

I have a lot of experience in turbocharged cars. I'm fairly new to the rotary scene but the basic principals are the same. It is true that the exact same engine can make more or less power on the same 12psi of boost from different turbos. Like someone already said all turbos have a flow rate they are most efficient at and will make the biggest power gain in these areas. A small turbo straining to make 12psi will rob more power from an engine because it blocks exhaust flow and has to be spun super fast which takes energy. Of course the smaller turbo will spool faster.

How come Vosko made 459 RWHP at 15 psi? Can one of you show me a 459 RWHP dyno at ANY boost level for stock twins?

Can someone give me a quick run down on how the seq turbos work? https://www.nopistons.com/forums/pub...1047683561.gif I've worked on volvos for a while, but never done any reading at all on tt cars. I always thought the first turbo ran low boost like 5lbs in the lower RPM's and then at around 3000rpms the second turbo kicked in w/ like 10-12psi and the primary one shuts off? now how wrong am i? https://www.nopistons.com/forums/pub...#>/biggrin.png

OR....I could be talking out of my ass(wouldn't be the first time and won't be the last). I don't know if I used all the correct terms or if I'm even close to right. https://www.nopistons.com/forums/pub...1047683561.gif I'ts just my theory. Please correct me if I'm off. https://www.nopistons.com/forums/pub...IR#>/bigok.gif

My understanding is that that over 4000 rpms or so if the smaller turbo is making at least 7psi of boost or so an actuator switches over to the larger turbo.



Someone correct me if I'm totally wrong.

Both turbos are the same... Or I thought they were... from what I read..

well, from what i know, the primary turbo boosts up to 10psi then it switches over to the 2nd turbo, thats why there's a 10-8-10 pattern...... 8lbs is the switch over..... then the second turbo takes it the rest of the way

Close.



The primary turbo boosts 10psi to 4500... then the transition to NON-SEQ occurs where both turbos COMBINED make the 10psi of boost.