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Turboing a big block? #314241
05/10/09 10:08 PM 05/10/09 10:08 PM
Joined: Sep 2005
Posts: 1,202
California
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polkat Offline OP
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polkat  Offline OP
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California
Big block Mopars like the 400 are poor candidates for simple build ups due to their poor compression (averaging 7.5 or so to 1). However, this is ideal compression when using a turbo. Has anyone here built a turboed big block, and how did you do it? Thanks!
Re: Turboing a big block? [Re: polkat] #314242
05/10/09 11:51 PM 05/10/09 11:51 PM
Joined: Nov 2007
Posts: 778
Sherwood park, Alberta.
go green Offline
super stock
go green  Offline
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Joined: Nov 2007
Posts: 778
Sherwood park, Alberta.
Turbocharged and stock .... nope .


6.50 @ 226 MPH 4.25 @ 186 MPH
https://www.youtube.com/watch?v=YX86DHGKBo0
Re: Turboing a big block? [Re: go green] #314243
05/10/09 11:57 PM 05/10/09 11:57 PM
Joined: Jan 2003
Posts: 1,175
NC
DARTSPORT340 Offline
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NC
It's probably going to eat the cast pistons before you even get over 8lbs of boost. You could run real cheap head gaskets and use them as a relief point and hope for the best

Post deleted by Defbob [Re: DARTSPORT340] #314244
05/11/09 12:25 AM 05/11/09 12:25 AM

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Re: Turboing a big block? #314245
05/11/09 02:15 AM 05/11/09 02:15 AM
Joined: Sep 2005
Posts: 1,202
California
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polkat Offline OP
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California
Yea, that's why I'm asking how it's done! Okay, go to forged pistons...what else? What turbo is usually used?
Re: Turboing a big block? [Re: polkat] #314246
05/11/09 03:06 AM 05/11/09 03:06 AM
Joined: Jan 2003
Posts: 2,697
Renton Wa
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topfueldart Offline
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Renton Wa
Turbo choice boils down 1000 percent to your realistic goals.. What kind of power do you REALISTICALLY want to make? How important are the spooling characteristics? At a certain point you have to choose between having low end boost for massive torque, and having a later spool (RPM wise) for higher horsepower combo's...

11.48 @ 120 with a 1.80 60' 318, stock 1.88 heads, stock 904, Pump Gas, 13 lbs of boost.

9.94 @ 134, 318 on pump gas, 14 lbs w/ Eddies, transbrake 727, 3600 lbs, 3.54 gear and 28's.
Re: Turboing a big block? [Re: topfueldart] #314247
05/11/09 03:42 AM 05/11/09 03:42 AM
Joined: Jun 2007
Posts: 960
NE Ohio
ixelerate Offline
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ixelerate  Offline
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Joined: Jun 2007
Posts: 960
NE Ohio
theturboforums.com

go to the mopar section and there you will find a great amount of tech and guys there that have done turbos. The torque of a turbo engine is tremendous, meaning that everything in the motor has to be very strong. This also means some serious $. You can go a cheap route of course to save some dough but in the long run you will be paying. Boost tends to break things, and a weakly built motor will not last. On the other hand, a well built turbo big block will create monster power and even get pretty good gas mileage. Turbo 'd cars need lower geared rears which help in mileage and streetability. There are guys running 600 plus turbo motors on the street no problem.

[img][/img][img]http://i277.photobucket.com/albums/kk45/ixelerate/random/falcon.gif[/img]
Re: Turboing a big block? [Re: DARTSPORT340] #314248
05/11/09 07:02 AM 05/11/09 07:02 AM
Joined: Nov 2004
Posts: 3,619
Norwich CT USA
Defbob Offline
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Defbob  Offline
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Norwich CT USA
Quote:

It's probably going to eat the cast pistons before you even get over 8lbs of boost. You could run real cheap head gaskets and use them as a relief point and hope for the best



hhmmmmmm................

then I've got problems lol

5221627-007.JPG (36 downloads)
Re: Turboing a big block? [Re: Defbob] #314249
05/11/09 07:03 AM 05/11/09 07:03 AM
Joined: Nov 2004
Posts: 3,619
Norwich CT USA
Defbob Offline
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Defbob  Offline
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Norwich CT USA
I plan on shoving 16lbs atop these

5221629-005.jpg (48 downloads)
Re: Turboing a big block? [Re: Defbob] #314250
05/11/09 09:17 AM 05/11/09 09:17 AM
Joined: Jan 2003
Posts: 965
Odessa, Fl
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blowndart Offline
super stock
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Posts: 965
Odessa, Fl
You can do it. You just have a severely reduce margin for error. Run it very rich to begin with, and as mentioned above, very conservative timing.

Re: Turboing a big block? [Re: Defbob] #314251
05/11/09 11:18 AM 05/11/09 11:18 AM
Joined: Aug 2003
Posts: 43,127
Bend,OR USA
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Cab_Burge Offline
I Win
Cab_Burge  Offline
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Posts: 43,127
Bend,OR USA
Quote:

I plan on shoving 16lbs atop these

Not for long

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Turboing a big block? [Re: polkat] #314252
05/11/09 12:29 PM 05/11/09 12:29 PM
Joined: Aug 2005
Posts: 759
Southington Ct.
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turbobitt Offline
super stock
turbobitt  Offline
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Posts: 759
Southington Ct.
Quote:

Big block Mopars like the 400 are poor candidates for simple build ups due to their poor compression (averaging 7.5 or so to 1). However, this is ideal compression when using a turbo. Has anyone here built a turboed big block, and how did you do it? Thanks!



I wouldn't say 7.5:1 or even 8.0:1 are "ideal" for turbocharging. For all out performance, I would run 9-10 to 1 compression to keep the spool rate up with bigger turbo's. Fuel managment will be key for any kind of reliability and power.
Allan G.

1970 Challenger w/572 Hemi street car and my pride and joy. 1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno. 1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
Re: Turboing a big block? [Re: turbobitt] #314253
05/11/09 12:42 PM 05/11/09 12:42 PM
Joined: Jan 2003
Posts: 1,771
St.Clair Shores MI.
tilt Offline
top fuel
tilt  Offline
top fuel

Joined: Jan 2003
Posts: 1,771
St.Clair Shores MI.
Quote:

Quote:

Big block Mopars like the 400 are poor candidates for simple build ups due to their poor compression (averaging 7.5 or so to 1). However, this is ideal compression when using a turbo. Has anyone here built a turboed big block, and how did you do it? Thanks!



I wouldn't say 7.5:1 or even 8.0:1 are "ideal" for turbocharging. For all out performance, I would run 9-10 to 1 compression to keep the spool rate up with bigger turbo's. Fuel managment will
be key for any kind of reliability and power. Allan G.



This is a statement i've herd a few times recently.Don Bailey was the last person i heard state this (very respected)

68 CORONET R/T BEST MACHINE BUILT EFI'd TWIN TURBO(UP and RUNNING !!) 03 Mach1
Re: Turboing a big block? [Re: polkat] #314254
05/11/09 04:06 PM 05/11/09 04:06 PM
Joined: Aug 2003
Posts: 43,127
Bend,OR USA
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Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
C

Joined: Aug 2003
Posts: 43,127
Bend,OR USA
Quote:

Big block Mopars like the 400 are poor candidates for simple build ups due to their poor compression (averaging 7.5 or so to 1). However, this is ideal compression when using a turbo. Has anyone here built a turboed big block, and how did you do it? Thanks!

If your going to make a bunch of power, above 800hp, I would use a better block than a stock production block There are some good production blocks out there but most of the stock production blocks have thin cylinder walls and most of the RB block have thin main webs

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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