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Considering Turbo, Suggestions?

I have a intercooled CT kit with a PT61 on my daily and I enjoy it. I leave it around 12 PSI and its very enjoyable and enough umph to make me smilie. Then again I'm hardly in boost.
 


Thanks! That looks like a good deal, but I'm beginning to go back to my original line of thinking that -for my purposes- a supercharger might be a better option. Again, looking for acceleration and handling on winding roads more than top speed on a straightway. Also leaning towards sleeper status. ;)

Anyone disagree?
 
kinda.
you can run a smaller sized turbo that would spool up faster and really help in the midrange.
for example, my dads stock grand national starts spoolin early in the rpm range. you can definitely feel the boost at around 3k.
 
But how much power would a small turbo grant in the low to mid rpm range compared to a good gen V setup?

I'm also curious about the wind-down on a turbo; if it has to spool then logically it would have to do the opposite at some point, so how long does the boost last once you start to decelerate? How would it handle rapid acceleration after decelerating?
 


ShadowSwept said:
But how much power would a small turbo grant in the low to mid rpm range compared to a good gen V setup?

I'm also curious about the wind-down on a turbo; if it has to spool then logically it would have to do the opposite at some point, so how long does the boost last once you start to decelerate? How would it handle rapid acceleration after decelerating?
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With a blow off valve the compressed air is immediately purged and the compressor wheel slows down, albeit at a very rapid pace.
Without a blow off valve, compressed air in the intake track has to go somewhere, so it goes out the front of the turbo causing compressor surge. This is when the wheel actually goes in reverse... it's tough on the turbine shaft so a BOV is recommended but not absolutely necessary on an auto car.
 
99pgpgt said:
When you let off, boost does too
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fry626 said:
With a blow off valve the compressed air is immediately purged and the compressor wheel slows down, albeit at a very rapid pace.
Without a blow off valve, compressed air in the intake track has to go somewhere, so it goes out the front of the turbo causing compressor surge. This is when the wheel actually goes in reverse... it's tough on the turbine shaft so a BOV is recommended but not absolutely necessary on an auto car.
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I understand this, I'm just wondering how a turbo would handle spooling up right after blow off and how it would effect boost.
I mentioned driving on roller-coaster road; gradual uphill climb followed by steep downhill drop followed by sharp turn then repeat. My suspicion here is that a turbo would begin to create boost near the top of the hill, when it would then be rendered useless and most of it would go out the BOV. Just a quick example, but am I wrong?
 
The only time your bov will really go off is if you raise up the rpm/boost then let off.. If the car shifts then you won't really hear it go off much. Automatics shift so fast that the boost surge really isn't all there
 
ShadowSwept said:
I understand this, I'm just wondering how a turbo would handle spooling up right after blow off and how it would effect boost.
I mentioned driving on roller-coaster road; gradual uphill climb followed by steep downhill drop followed by sharp turn then repeat. My suspicion here is that a turbo would begin to create boost near the top of the hill, when it would then be rendered useless and most of it would go out the BOV. Just a quick example, but am I wrong?
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I'm not sure you understand anything I said lol...
The turbo is gonna make boost depending on throttle position. Assuming you're running a proper sized turbo it's going to spool and make boost within a tenth of a second, release that boost when you let off the gas in less than a tenth of a second, and then spool up again in the same amount of time after you get back on the gas.
 


I'm saying I know what a BOV is and I would definately have one if I go turbo, I'm just thinking the way I like to have fun with my car I wouldn't see a lot of boost with turbo unless it was a really small one- which wouldn't do a lot of good when I do decide to go for speed. A supercharger provides near constant boost, or at least more linear, which is why I'm thinking it may be better suited to my particular needs. No doubt for racing -especially strip- turbo would be better, but I mostly stick to the streets.
 
if you dont want lag you could twin charge (supercharger and turbo). you wont get crazy power but you will get the kind of power you are looking for. people will tell you that you cant max out the turbo power if you have the supercharger on there too. but you arent looking for crazy power so its not a terrible idea. i know theres some guys on here running twin charged setups that are gett around 400whp. so this is something to just think about and consider. like i said you couldnt max out the turbo but it doesnt sound like you want to get over 500whp so it doesnt really matter. and i think its just badass to be able to say you're twin charged haha. so yeah just a thought
 
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....alrighty...

winterstorm said:
if you dont want lag you could twin charge (supercharger and turbo). you wont get crazy power but you will get the kind of power you are looking for. people will tell you (for example ctracer might tell you this sry matt haha) that you cant max out the turbo power if you have the supercharger on there too. but you arent looking for crazy power so its not a terrible idea.
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So 410WHP on a stock blower pulley isn't crazy power for a FWD family sedan?

winterstorm said:
i know theres some guys on here running twin charged setups that are gett around 400whp.
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Now you're contridicting, because that 160WHP you make in the N/A car must be comparable, correct?

winterstorm said:
so this is something to just think about and consider. like i said you couldnt max out the turbo but it doesnt sound like you want to get over 500whp so it doesnt really matter. and i think its just badass to be able to say you're twin charged haha. so yeah just a thought
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It's not really much of a thought, twincharging would be more of a headache than either building a stout blower setup making 300~WHP (which would be pretty simple on a L36) or a bolt-on Z3 kit and enjoy...then nothing needs to really be removed other than exhaust parts and the intake setup. But, it isn't rocket science; most of the time people over analyize these situations and blow them out of proportion. Just go source a used turbo kit, or buy a Z3...but I also agree with whoever suggested the research mod. Looks like you still don't really know what you want out of the platform or what goals/budget you'd be working with...just kind of a base "hey, I wanna go faster and not break sh1t".

Supporting mods for a turbo setup?

Uhhh, go get an HV3, if you want...port the LIM runners, PLOG's front and rear work great (if you can use the rear one on the Z3, if not...get a PEM?)

...so yea.

/done
 


One other things to consider as with FWD and it being a street car, there is only so much low end power that can be put down without traction issues.
 
The smaller turbo's on the market for these cars are still more efficient and will make more power than a genV. Your biggest problem with that type of driving is your transmission, you want your neck snapped everytime you hit the throttle, it's just going to **** all over itself. You will have more fun driving and less of a headache with just a Z3 kit.
 
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