n00b question about turbos

Well everyone I just started learning about modifying cars with aftermarket parts a few months ago and I'm still learning.... so this is gonna sound like a really n00b question but I need to ask. my mind can't be at rest for some reason....

I'd really like to understand how someone can regulate boost pressure. I know that my cavalier can't go beyond 10PSI with stock components... so how do I keep the turbo from going over 10 PSI?

And also... If I do decide a higher output how do I go about getting beyond 10 PSI from my turbo?

Sorry again to all you car buffs who read this and scoff at me... I'm trying my best here.

U have a turbo on a cavi and u just started learning about turbos?? thats pretty good i wish i had a turbo cavi
(sorry that dint really help u i just thought it was cool)

sounds like he has money to do whatever. and someone just got him into tuning a sport compact. but i am not 100% sure about it but i think Blow off valves take part in that. so when it hits a certain Psi the blow off valve opens and releifs pressure. and like i said i am not 100% sure but i would imagine thats how.

Yes you are correct. The blow off valve sets maximum pressure. It consist of a spring that holds the valve closed, when you have enough pressure the spring can no longer hold it shut. It opens and releases air until the pressure drops below the spring strength. Have fun.

And well i will add to that they are adjustable lol

ya - ya really couldnt get a better answer than how public described it - nj - if your gonna go with a turbo i can asure you that it is alot more practical than a supercharger, you will get better boost more power gain an have more doors open with a turbo than of a supercharger, superchargers acually use some of the engines power just to run them cause they are belt drivin. if you have the money an the know how - i would recomend gettin a turbo timer an boost controller- very good to have with using a turbo on a car that doesnt have one normaly, the turbo timer is great because u can set the turbo to still spin even when engine is shut down so it makes the bearings an such last longer - cause ur suposed to let the turbo idle for atleast 30 seconds if u just pulled off a highway or driving a good rate of speed - cause figure it this way if u pull off a highway u were doin like 60 mph ur turbo is still spinning 80k rpm after ur in the parkin space an to shut it right down wears them down faster than normal. a boost control does such - controls boost pressure - allowing u to set a certain psi & ect... an also will allow you to control an air an fuel mixture.... both are great to have - have them installed properly though- i have both my turbo charged cars equiped with both- good luck....

personally i think superchargers are better just for their ease of use. And most turbo guys dont know what they are talking about when it comes to superchargers. If your going to go with a supercharger get an eaton. They dont draw more than 5-10HP from the engine at most and they are so much easier to maintane. You dont need more frequent oil changes, boost controllers, boost timers, intercoolers, any of that junk. A eaton M62 blower will make 12 PSI at around 6000 RPMS. IT also has a built in wastegate that lets you electronically control the amount of boost. Also they are designed so that at low rpms they dont use any engine HP.

hmm thanks guys. If anything I'll have my friend Elias help me out on this. he's a GM guy and well if anyone would know how to modify the correct pressure and help install the thing... I'm hoping he would know what he was doing. I really appreciate the help too... meh money is kinda looking short for this month. Gotta pay the bills and eat... so the car's on the back burner for a little but hey... she's fine where she is..... for now at least. Thanks a lot guys. I really appreciate it. Hopefully I'll get some time to modify her a bit later in January. Thanks

Wish me luck.

personally i think superchargers are better just for their ease of use. And most turbo guys dont know what they are talking about when it comes to superchargers. They dont draw more than 5-10HP from the engine at most and they are so much easier to maintane. You dont need more frequent oil changes, boost controllers, boost timers, intercoolers, any of that junk. A eaton M62 blower will make 12 PSI at around 6000 RPMS. IT also has a built in wastegate that lets you electronically control the amount of boost. Also they are designed so that at low rpms they dont use any engine HP.

(Ok not to start a fight just to point out some facts) - an dont talk down on others when your not even correct yourself. :smokin:
1. they may be easier to put on i will agree with that but they are still not worth it.
2.most turbo guys? are u stating that i am a turbo guy an dont know anything about superchargers? we turbo charged a maro with a 305 TPI - ya we gained some power but wasnt worth the money... we only pulled 10psi outa it to be safe- then a year later he got a t-kit for it which is now in some cases a lower cost but more to bolt on - we turbo'd the 305 tpi an got phenomial hp an torque curve gains - when we dyno tested it the camaro practicaly came off the dyno -even though it was properly strapped down.. when he layed into third gear it jerked sideways from all the torque an we had to shut it down for everyone's safety.
3.u stated :hey dont draw more than 5-10HP from the engine at most and they are so much easier to maintane. yet you then say : Also they are designed so that at low rpms they dont use any engine HP . LOL HOW? how does it not draw any of the cars power that is total BS - nothing u can to will completely allow a supercharger to run with out drawing any power from the engine when it is belt driving silly.. :chair:
4. you dont need to have more frequent oil changes just cause you have a turbo... most of the aftermarket turbo kits are hybrid tuff guy...
5.12psi @ 6000 rpm lol you dont get hardly any boost until your car is nearly if not is redlined. where as if your turbo charged turbo lag is such ancient history u can get full boost as soon as u lay into the throttle,with or with nearly 0 turbo lag.

:owned:

cant wait to see what kind of cry baby :crying: feedback this dude gives this thread

i am not bashing superchargers - my friend has a supercharged 302 mustang that puts out a nasty 500hp but it was so much work just to get it to that point, he wants to twin turbo the one he is in the process of building now - can't wait to start installing on it

I got to the bit about the BOV's and didn't even read-on I had to reply a.s.a.p. Teh BOV (blow off vavle) has nothing to do with regulating boost this merely releases excess bosst when the revs drop. They do open at certain pressures though. The ideas is that when you press the throttle again the pressure didn't build right up while the you were shifting for example and then whren the throttle butterfly opens it forces much more air into the motor and can cause some serious damage. Stock cars have BOV but they are usualyy called recirculating valaves and just put the air they release back into the intake. That's why when you shift in a turbo it give off the wonderful hiss or a whirr depending on the style of BOV. Boost is regulated by the wastegate!!!! This basically is a plate that is spring loaded and when the boost gets to a certain level it open and release exhaust pressure to prevent the boost from exceeding it preset level by sending less exhaust to the turbine {hence 'turbo}(wastegates are a little more complicated than that but it's easier to explain it that way) The best way to reguate boost is with an electrical 'boost controller' this basically goes in the line that goes from the manifold to the wastegate and prevents the wastegate from opening until the boost controller lets it. You can also uprate the wastegate or the wastegate actuator. 10 psi would warrant about a -34 actuator. So for 10 psi you would want a small turbine and thenuse a boost controller. Boost controllers are about $300 but you can get a bleed valve or ball valve which is a boost controller but it is basically a chaber that the gasses pass through that has a ball sitting in the end of a spring. and it's is tightened by screwing the spring seat in or out in for more boost out for less. The only problem with a ball valve, is they are pretty crude and can stop the wastegate getting anything at all! You can also make these yourself. I'm glad to be of service and also, the whole supercharger vs turbo thing. for a small amount of boost that you are lloking for supercharging will be best as it is less work to install and although you have to change a pulley to change the boost. You can still have the BOV and possibly a chargecooler/air to water intercooler whatever you prefer to call it. Also supercharger whine sounds awesome and superchargers don't have lag like a turbo and anti-lag systems demolish turbo's if anyone wants to know how anti-lag systems work let me know.If you are set on a turbo about a garret T2 size will be best although they don't look much.

Also The whole thing about superchargers draing engine power. Turbo do exectly the same only by way of tons of back pressure. Consider this. You spend $800 on a perfomance exhaust because it 'flows' better and an engine is essentially a pump so if you smooth out it's intake and exhaust it will be more effiecient and powerful but a trubo manifold alone has a nice tight bend in it and then the exhaust gasses have to spin a turbine and as boost increases the air is harder to compress putting resistance on the turbine wheel causeing more back pressure!!!!!! Doesn't that make sense. Oh and a supercharger does always draw power from the engine and the guy desribed a roots style blower that has a vacuum valve so that it doesn't boost when throttle is only a little open. That's purely for economy.

Also I have a new type of blower under development that can be extremely tuneable and completely switched off and draws, very very little from the engine to work. I've not even made a prototype yet but working on it. Money need to go elsewhere first unfortunately.

hmm thanks guys. If anything I'll have my friend Elias help me out on this. he's a GM guy and well if anyone would know how to modify the correct pressure and help install the thing... I'm hoping he would know what he was doing. I really appreciate the help too... meh money is kinda looking short for this month. Gotta pay the bills and eat... so the car's on the back burner for a little but hey... she's fine where she is..... for now at least. Thanks a lot guys. I really appreciate it. Hopefully I'll get some time to modify her a bit later in January. Thanks

Wish me luck.

remember a turbo requires more then just bolting it on, plan to upgrade the computer and fuel system too(or at absloute minimum larger injectiors or the engine won't last)

remember a turbo requires more then just bolting it on, plan to upgrade the computer and fuel system too(or at absloute minimum larger injectiors or the engine won't last)

So true. Not to mention the fact that you have to drill and tap a hole for your oil feed!!!

So true. Not to mention the fact that you have to drill and tap a hole for your oil feed!!!

ah yes, and if you are smart a boost, A/F, oil temp and oil pressure gauges

and the possibilty of having to modify you exhaust to meet the back end of the turbine. possible intake plenum or even manifold mods and some work to fit you beautiful front mount intercooler in place behind the front bumper.

Although if you run Methanol instead of Gasoline you don't need to bother with the intercooler because it's rather potent. By the way methanol exhaust fumes are very bad it really hurts your throat and lungs and makes your eyes water.

i think we may have scared him off the idea......

i think we may have scared him off the idea......

Well you know that Turbo's aren't as easy as people like to think. But leave it to him, his bank balance huh?

why would u bring up about turbo lag? turbo lag is history these days you can get full boost @ 1k rpm - unlike a supercharger that is preset to function at a higher rpm which means delay in boost .... w/e i am not gonna say anthing else in this post i been gone i was just catchin up on shit -my point was stated..... have fun newb(s) noshun that is alot of usless info haaa.... you dont really seem to know what your talkin about on most of your posts in this thread

why would u bring up about turbo lag? turbo lag is history these days you can get full boost @ 1k rpm - unlike a supercharger that is preset to function at a higher rpm which means delay in boost .... w/e i am not gonna say anthing else in this post i been gone i was just catchin up on shit -my point was stated..... have fun newb(s) noshun that is alot of usless info haaa.... you dont really seem to know what your talkin about on most of your posts -


I think that you will find that that I know more what I'm talking about than you do! Turbo lag is still ever present except for in cases where an electroic aid is added. You just seem to spout a lot and not actually give any useable advice. You may own a turbo'd car but so does a 17 year old Girl I know and I had to show her how to check the oil. My shit is not useless at all. If it was Then the more experienced guys who also know what they are talking about would disagree more. I only usually get that when I express an Opinion. I recieve a lot of gratitude for my post! Peace out!

aww - should i cry? lol kid dont talk down on me .... i have rebuilt more engines than your IQ and swapped more motors than cars you have done work on so dont be acting like i dont know what i am talkin about - i do know that you will have lag from .01 --> on without a electronic device - but all i said was turbo lag is gone these days if you have it your not serious about racing your car - which is fine for someone that wants the bang still - a device is not needed to have a better put that a sc because of the set up the way they are ment to be used u will get more boost for your money - 3-4k sc 6-12 psi 2-3k turbo 30 psi+ which would your rather pay to have on your car ? hmmm lets think - thank you - 1

i can get T03/T04 turbos for $400 an the rest -race manifold or ceramic mandrel bent for fast flow /tb/down-p/punched sensor/stainless external wastegate flange/management system chip/yadayadayaa for another 1,300 or just if the you need a race manifold an down-p $425,

despite the fact of all this shit - everyone has prefferences an that is why we are having this out of hand arguement -
Ok - you help people -
I help people we are both happy cause we know we have both helped people - thats that :smokin:

i can get T03/T04 turbos for $400 an the rest -race manifold or ceramic mandrel bent for fast flow /tb/down-p/punched sensor/stainless external wastegate flange/management system chip/yadayadayaa for another 1,300 or just if the you need a race manifold an down-p $425,

despite the fact of all this shit - everyone has prefferences an that is why we are having this out of hand arguement -
Ok - you help people -
I help people we are both happy cause we know we have both helped people - thats that :smokin:

Definitely time for truce! I'm more of an NA and circiut runner myself this spring anyhow. I would have boost if I had another car though, but not my circuit car.

:) :p

:) :p

$400 for a t3/t4 hybrid?

that is correct

that is correct

That's crazy! Is it cost? I wouldn't tell people that, you'll be bombarded with PMs to get people them.

How about a nice big T28BB

hope i could be some help here man. you have a turbo cavy im hoping its a 2.4 cause if its a 2.2 you cant do 10psi. i have a 2.4 andi wont go above 6psi on my stock internals. but to controll your boost you need the boost controll(manual or auto i have auto much easier) and your boost gague which also displays the reading from your pod and some auto boost controll show you. if you want a turbo timer its not a bad idea but i dont have one yet. if you have a decent turbo (i have t3/t4) i think it can max over 25psi so you will never see that on a cavy unless you drop pistons and rods to lower to the 7's for compression but for some cars like the 2.4 you want to keep your compression up there so its good to just do 6psi on stock internals becuase lowering compression looses power so by doint 10psi your making up for the lost power and around the same hp output as you would at 6psi stock internals. hope this helped. oh and another thing front mounts are somethin youd want because you run to high a risk with out it. and thats all i think you need to kno.

ya it is cheap - i already have gotten 5 of them for other people that i know that live close to me....
shhhhh damn i better not get pms now that u said that u prolly hexed me lol

oh i would have to check on that - when i find out i will pm you if i can get one for reasonable price

ya it is cheap - i already have gotten 5 of them for other people that i know that live close to me....
shhhhh damn i better not get pms now that u said that u prolly hexed me lol


Rim shamala hinsay eflina juncy. Now you are Hexed!!!!!!!!!!

oh i would have to check on that - when i find out i will pm you if i can get one for reasonable price
Don't worry too much more just for reference as like I said I'm not a boost guy!

lol

I think I have been thoroughly scared away from any sort of forced induction....

hell.. I think you guys have scared me from even looking at my car >.>.... damn....

I'm scarred for life...... sheesh