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Why do so many idiots think big turbo = not "streetable"???

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Old 04-19-2007, 04:04 AM
  #21  
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Default Re: Why do so many idiots think big turbo = not "streetable"???

Originally Posted by Joseph Davis
We take caged cars on slicks out on the streets.

Max, I've told you before you need to visit.


thats what california was like 5+years ago. Classic was at a BOTi a couple of the quick 16 qualifiers showed up to the street races in Lancaster saturday night right after qualifying. Now good luck driving a Honda w/ a set of lowering springs without being fucked with. Why Im never building another street Honda again.
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Old 04-19-2007, 04:33 AM
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Default Re: Why do so many idiots think big turbo = not "streetable"???

Originally Posted by Joseph Davis
We take caged cars on slicks out on the streets.

Max, I've told you before you need to visit.

One day Joey, one day.


Originally Posted by chris


thats what california was like 5+years ago. Classic was at a BOTi a couple of the quick 16 qualifiers showed up to the street races in Lancaster saturday night right after qualifying. Now good luck driving a Honda w/ a set of lowering springs without being fucked with. Why Im never building another street Honda again.
Back in the day. Cars would line up and run one after another. Major streets and all. Too bad I moved here right before it was all going away.

I feel lucky. I haven't been pulled over yet, I guess driving un-retarted doesn't get you noticed.


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Old 04-19-2007, 08:54 AM
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Default Re: Why do so many idiots think big turbo = not "streetable"???

Originally Posted by Joseph Davis
We take caged cars on slicks out on the streets.

Max, I've told you before you need to visit.
Joey, my new shop is exactly 2 miles from the house...heh heh hee....
Time to get some slicks for the teg... Or a moped. :P
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Old 04-19-2007, 09:02 AM
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Default Re: Why do so many idiots think big turbo = not "streetable"???

Originally Posted by slo_crx1
Here is the reason...big turbos are usually meant to be run at higher pressures than most stock blocks can handle. Basicly when selecting a turbo for your build you want to keep your cfm/pressure level in the center island on a compressor map where it gives you the highest effciency rating. If you look at a compressor map from a large turbo (large t3/to4e type and up) you'll notice that peak efficiency isn't down low at the under 10psi level, it's usually up more towards the 16+ range. This is fine if you have a fully built motor capable of handling that cfm and pressure level, but for stock motors you're just asking for it. Running lower than the efficiency island results in hot air being forced into your engine, which can lead to detonation and melting/breaking pistons from high cylinder temps. That's why it's best to pick the smallest turbo that meets your hp goal at peak efficiency and use that. Not only do you usually have better respnose time, but a properly matched setup is just so much more fun to drive and easier to tune.
This is some great info. I never realized that a turbo running below efficiency created so much extra heat (while it's obvious this happens when running past efficiency).

There are a lot of good points people made, and it makes sense. I seriously never understood why people would say that, considering MY definition of "streetable" was that it was possible to drive it on the street without it being a total pain in the ***. Thanks for the insight....

and thanks more for the digression!
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Old 04-19-2007, 12:26 PM
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Default Re: Why do so many idiots think big turbo = not "streetable"???

Originally Posted by Hitchhikkr
Joey, my new shop is exactly 2 miles from the house...heh heh hee....
Time to get some slicks for the teg... Or a moped. :P
You mean you have a lack of shopspace?

BRM might be able to hook you up with their 23" slicks... they have trick rimz for them, and frankly they don't have anything shooting for the power range those are suited for. Unless they build Brandon's old orange CRX, but I doubt that's even on their radar.
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Old 04-19-2007, 12:51 PM
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Default Re: Why do so many idiots think big turbo = not "streetable"???

What was said about turbo output temps is not entirely true. Using this calculator you can see temperature isn't that big of a deal under a lot of circumstances, especially low boost/---- compressor efficiency. Example, 75% compressor efficiency, 10psi, we are talking about temps around 86*C. 65%, 10psi, we are talking about 96*C. With 70% intercooler efficiency and .5psi pressure drop the difference is only 3*C. So really the temperature thing at low pressure is really not worth mentioning. Its a non factor for the most part. Using the calculator posted above really gives you a pretty solid idea what kind of output temps you can expect on a given system. 70% compressor efficiency at 10psi has almost the same output temp as 75% compressor efficiency at 11psi. So really, if you are only worried about intake air temps, running lower pressures even at lower compressor efficiency is far more effective if this calculator is at all accurate.

Streetable=response+powerband. It's as simple as that. Big turbos on small displacement engines are not able to produce broad powerbands in the midrange that respond well. Put your foot down to the floor on a B16/18 with a SC61 at 3000rpm. Do the same thing with a 60 Trim T3. One will respond immediately. The other will make noise for 1500rpms and then provide you with too much power for the given situation. One has a power/response usable on the street, the other does not. Its as simple as that.
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Old 04-19-2007, 01:02 PM
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Default Re: Why do so many idiots think big turbo = not "streetable"???

Originally Posted by Inquisition
Put your foot down to the floor on a B16/18 with a SC61 at 3000rpm. Do the same thing with a 60 Trim T3. One will respond immediately. The other will make noise for 1500rpms and then provide you with too much power for the given situation. One has a power/response usable on the street, the other does not. Its as simple as that.
SC61 spools on B18 at 2500 if it's a 2L. The street car Joey mentioned runs that exact turbo. If it spools in first, and doesn't drop out of boost when you're racing, it's not too big. It doesn't mean smaller more responsive turbo's aren't just as fun, just different approaches.
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Old 04-19-2007, 01:05 PM
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Default Re: Why do so many idiots think big turbo = not "streetable"???

Originally Posted by Minor Threat
SC61 spools on B18 at 2500 if it's a 2L. The street car Joey mentioned runs that exact turbo. If it spools in first, and doesn't drop out of boost when you're racing, it's not too big. It doesn't mean smaller more responsive turbo's aren't just as fun, just different approaches.
Ive driven in primarily cars with SC61s. Most of which are b18's. None of them provided me a decent powerband in the midrange compared to a simple T3. Driving with a SC61 is a waiting game and then a battle against torque steer. Not something you can use unless you are sitting in a straight away. Simple t3 setup you can stomp on the gas, build a couple of lbs, and still keep control even though you are making 20ft lbs more of torque at 5000rpm.
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Old 04-19-2007, 01:50 PM
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Default Re: Why do so many idiots think big turbo = not "streetable"???

I guess my point is,

if it makes "too much" power for the situation, then why is your foot on the floor?

Ok, maybe back to this...

Does streetable mean you can drive it on the street without too many headaches,

or does streetable mean that it has good traction on the street?
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Old 04-19-2007, 03:38 PM
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Default Re: Why do so many idiots think big turbo = not "streetable"???

Pinks car is SC44, has the .60 T04E compressor.
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