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Old 11-18-2017, 12:37 AM   #51
Vincent Gagnon
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Quote:
Originally Posted by apachechef View Post
when calling out dumbassersy, perhaps forego the poetic embellishment, as it sure to be lost
on the dumbass himself.
Sounds good.
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Old 11-18-2017, 01:05 AM   #52
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Originally Posted by 740atl View Post
unless you’re considering a compound setup with a small turbo feeding into a larger one.
Compound turbos generally feed the other way. A small turbo upstream would choke the larger one. Ideally you want a large turbo running at a relatively low pressure to move a high volume of air into a smaller unit which is used for higher pressure. For example, If you're running a large turbo (high vol, low press) at 10psig then it is responsible for the work of increasing your intake pressure to 24.7psia. Then you might set the smaller turbo (lower vol, higher press) to operate at pressure ratio 2, therefore running the smaller turbo in its area of peak efficiency and achieving 49.4psia (34.7psig) while splitting the work nicely between the two. Compare that to trying to push 34.7 pounds of boost from a single turbo. In most cases running a single at 34 while maintaining a reasonable powerband would be well outside it's peak efficiency and you would generate a lot of excess heat.

But how many people are really trying to run a 35psi redblock anyway?
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Old 11-18-2017, 12:12 PM   #53
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I find this all interesting.
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Old 11-18-2017, 01:20 PM   #54
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They will do high pressure but only at high revs
Forget all the bling-bling , build an engine that makes decent na power , use a big-ish turbo , and even stock ( late ) internals will survive rather high hp numbers
You dont even need bigger valves , but porting is a must on any 8 valve head
If you are the kind of guy that prefer the t cam , or really think you need adjustable gears just to run the a-b-k-h cam , forget it......
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Old 11-18-2017, 01:30 PM   #55
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two is more betterer
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Old 11-18-2017, 04:51 PM   #56
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Compound turbos are an excellent way to reduce turbo lag as well. This has me considering this for our 302 draw through 242 now...
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Old 11-18-2017, 07:56 PM   #57
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Originally Posted by naterhater View Post
Compound turbos generally feed the other way. A small turbo upstream would choke the larger one. Ideally you want a large turbo running at a relatively low pressure to move a high volume of air into a smaller unit which is used for higher pressure. For example, If you're running a large turbo (high vol, low press) at 10psig then it is responsible for the work of increasing your intake pressure to 24.7psia. Then you might set the smaller turbo (lower vol, higher press) to operate at pressure ratio 2, therefore running the smaller turbo in its area of peak efficiency and achieving 49.4psia (34.7psig) while splitting the work nicely between the two. Compare that to trying to push 34.7 pounds of boost from a single turbo. In most cases running a single at 34 while maintaining a reasonable powerband would be well outside it's peak efficiency and you would generate a lot of excess heat.

But how many people are really trying to run a 35psi redblock anyway?
This is what I was referring to. The compound setup on a 2jz .

big little ...little big... it’s still a better than two rinkydink turbos on a tractor motor.

https://youtu.be/y-Me6yWApzY
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Old 11-19-2017, 01:09 PM   #58
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My dream for a smooth 300hp has been to modify the bmw E60 twin turbo for a red block.

http://www.ebay.de/itm/BMW-BiTurbo-T...-/271888406505

Nice little package and the earlier version has only vaccum actuators.
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Unique for sure.
I don't think anyone is going to tell you it looks bad.
Kinda can't go wrong under the hood.
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Old 11-21-2017, 11:57 AM   #59
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Quote:
Originally Posted by VB242 View Post
I thought Porsche had some success with 2 turbos as did BMW 335i.
Yeah, Porsche did and still does. See below.

The 335 is a twin turbo straight six. Makes a lot more sense than a twin turbo 4 (not saying don't do it however). 335i's and 535i's were by far the best move BMW ever made. 335i's are seriously lively stock and tuneable to a far greater degree than the M3. Never mind that N54's are plentiful and cheap compared to that S65 V8 which runs the same risks of rod bearing faliure as it's big brother S85.

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Originally Posted by John V, outside agitator View Post
Never done in any serious competition.
Nope.
Quote:
Originally Posted by Vincent Gagnon View Post
In: "Any serious competition"?
Uhh.... 935, 961, 962, GT2RS, Ferrari F40, GTR Nismo GT3, Audi R10 TDI?

Sure, those are all 6's or 8's, but let's make sure we are clear.

TT 4's don't make much sense, but it may based on packaging. V4's (Honda, Saab) or flat fours (Honda, Subaru, Porsche)?

Quote:
Originally Posted by JerryJS8 View Post
My dream for a smooth 300hp has been to modify the bmw E60 twin turbo for a red block.
How about this? 960 engine and transmission with the S80 twin turbo setup? You could....

1) Just buy a 960! A pre odb2 one might be better based on where you're living.
2) Transplant one into a 240,
3) or even better, transplant one into 7/940. They'll drop right it!
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Last edited by BDKR; 11-21-2017 at 02:30 PM.. Reason: Duh!!!!
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Old 11-21-2017, 12:08 PM   #60
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BTW, there was a dude in NW Europe that did a twin 16T 16v. The reason was because 16T's are cheap, relatively plentiful used, and easily rebuilt.
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Old 11-21-2017, 03:51 PM   #61
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Quote:
Originally Posted by BDKR View Post


Uhh.... 935, 961, 962, GT2RS, Ferrari F40, GTR Nismo GT3, Audi R10 TDI?

Sure, those are all 6's or 8's, but let's make sure we are clear.
OK factory bazzillion dollar road race cars are in this context not serious...

Ass-fault in general is an engineering and budgeting (searching for sponsorship) exercise, not serious racing.

just to be clear
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Old 11-21-2017, 04:43 PM   #62
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Quote:
Originally Posted by John V, outside agitator View Post
OK factory bazzillion dollar road race cars are in this context not serious...

Ass-fault in general is an engineering and budgeting (searching for sponsorship) exercise, not serious racing.

just to be clear
Just so we're clear, you're full of 5h1t! Goal post moving at it's finest. You clearly say...

Quote:
Originally Posted by John V, outside agitator View Post
It never works on gas car ...
Never done in any serious competition.
...now you wanna backpedal with some bull5h1t technicalities or "context' when none was provided before.

Guess what! Nobody here needs a "bazillion" dollar budget to go get (as an example!) an E320 engine and transmission (because they're cheap and plentiful), slap two 19T's on there easily make 500hp. Or, as some are already doing, running two 19t's on N54's and making over 600hp on stock blocks.

The sooner people stop listening to crap like this and actually look at the world outside of TB, they'll do some cool stuff.
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Old 11-21-2017, 04:52 PM   #63
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Need N54 with two 88mm turbos. Go big or go home. It'll never spewl. But I could say I got it.
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Old 11-21-2017, 05:01 PM   #64
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Originally Posted by hiperfauto View Post
Folks on here don't know a good deal when they see it.
how psi a stock can support?

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Old 11-21-2017, 05:12 PM   #65
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Quote:
Originally Posted by John V, outside agitator View Post
OK factory bazzillion dollar road race cars are in this context not serious...

Ass-fault in general is an engineering and budgeting (searching for sponsorship) exercise, not serious racing.

just to be clear
Tell that to the formula one teams and constructors that spend hundreds of millions of dollars. They be laughing directly at you, not with you.
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Old 11-21-2017, 05:19 PM   #66
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A Lotus twin turbo V8 Esprit comes to mind. Not all that expensive, turn key car you could buy right off the showroom floor. There are plenty of applications of twin turbocharged vehicles that work very nicely when the turbos are sized properly for their intended use.
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Old 11-21-2017, 05:23 PM   #67
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You won't be really cool until you run one turbine per exhaust port into ITBs and also use individual blow off valves that play the first x notes of When the Saints Go Marching In.
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Old 11-21-2017, 05:29 PM   #68
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Originally Posted by brian smith View Post
You won't be really cool until you run one turbine per exhaust port into ITBs and also use individual blow off valves that play the first x notes of When the Saints Go Marching In.
This guy gets it.
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Old 11-21-2017, 05:31 PM   #69
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Build it, break it, build what broke stronger, lather, rinse, repeat.

The Build Thread
SVEA - PUSHROD TURBO!
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Old 11-21-2017, 06:34 PM   #70
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Quote:
Originally Posted by BDKR View Post
Guess what! Nobody here needs a "bazillion" dollar budget to go get (as an example!) an E320 engine and transmission (because they're cheap and plentiful), slap two 19T's on there easily make 500hp. Or, as some are already doing, running two 19t's on N54's and making over 600hp on stock blocks.

The sooner people stop listening to crap like this and actually look at the world outside of TB, they'll do some cool stuff.
Quote:
Originally Posted by cwdodson88 View Post


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Old 11-21-2017, 06:43 PM   #71
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yep, it may not be ideal, or efficient, or powerful.... but how would you know for sure?
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Old 11-21-2017, 06:45 PM   #72
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Quote:
Originally Posted by Vincent Gagnon View Post
Point proven! You didn't actually add anything constructive or informative. You're just "going TBOT" ad tag teaming with that other drunk JV.

You, in this thread said...

Quote:
In: "Any serious competition"?
When?
Where?
In other words, you cantankerous, ignorant and just as full of 5h1t as JV.

Oh, and BTW...

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Old 11-21-2017, 06:51 PM   #73
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Quote:
Originally Posted by BDKR View Post
Point proven! You didn't actually add anything constructive or informative. You're just "going TBOT" ad tag teaming with that other drunk JV.

You, in this thread said...



In other words, you cantankerous, ignorant and just as full of 5h1t as JV.

Oh, and BTW...



Ok.
Did you say anything constructive or informative?

If so:
where?
And when?

Noticed the question marks?

You said it was cool, I said it was cool.

Can we move on now?
I think the "cool" goal is reached, because that seems to be the point here.

Quote:
Originally Posted by cwdodson88 View Post
yep, it may not be ideal, or efficient, or powerful.... but how would you know for sure?
Who care?
It's cool.

Last edited by Vincent Gagnon; 11-21-2017 at 07:02 PM..
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Old 11-21-2017, 07:00 PM   #74
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Quote:
Originally Posted by Vincent Gagnon View Post


Ok.
Did you ask anything constructive or informative?

If so, where?
And when?

Noticed the question marks?

You said it was cool, I said it was cool.

Can we move on now?
I think the "cool" goal is reached, because that seems to be the point here.

Who care?
It's cool.
Yeah, we can move on.

Oh, and BTW...



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Old 11-21-2017, 07:03 PM   #75
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Cool.
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