Turbo BBC
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Junior Member
Joined: Dec 2006
Posts: 52
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From: Port Orchard, WA
Car: 1983 Z-28
Engine: 454
Transmission: TH700R4
Axle/Gears: 7.5" with 3.23 gears
Turbo BBC
Well decided to turbo the camaro. I finally got the big block and TBI Injection swap done and was having trouble figuring out exhaust when I figured it might be fun to have a Forced induction car.
I dont wanna spin the motor over 5500 RPM, and am thinking a mild 10 PSI of boost. I already got the "headers"figured out Just having trouble figuring out turbo(s) size and waste gate that would be needed to control it. Any Ideas?
EDIT: I have a T04 brm turbo already has a 60 ar/88 ar exhaust...I am assuming that this is too small unless i get another one of them....would that be ok
Here are a couple teaser pics

I dont wanna spin the motor over 5500 RPM, and am thinking a mild 10 PSI of boost. I already got the "headers"figured out Just having trouble figuring out turbo(s) size and waste gate that would be needed to control it. Any Ideas?
EDIT: I have a T04 brm turbo already has a 60 ar/88 ar exhaust...I am assuming that this is too small unless i get another one of them....would that be ok
Here are a couple teaser pics

Senior Member
Joined: Mar 2012
Posts: 553
Likes: 1
From: Ballwin, MO
Car: 1987 Trans Am
Engine: 355 tpi
Transmission: 5 speed
Re: Turbo BBC
I am going to be adding turbos to my BBC for my RV, I think your choice of turbo may be to small even if you do twins, And your tbi may also be to small, if I'm wrong I'm sure I will be told so, , I plan on running an aftermarket fuel injection and a 730 computer . I'll be making my own headers for mine, But I'll be watching your to see how it comes out,
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Joined: Oct 2005
Posts: 1,050
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From: Glen Park, NY
Car: 1987 IROC-Z
Engine: TPIS II Supercharged w/Nitrous
Transmission: 700R4 Probuilt
Axle/Gears: 3:73 Richmond 12 Bolt
Re: Turbo BBC
I am going to be adding turbos to my BBC for my RV, I think your choice of turbo may be to small even if you do twins, And your tbi may also be to small, if I'm wrong I'm sure I will be told so, , I plan on running an aftermarket fuel injection and a 730 computer . I'll be making my own headers for mine, But I'll be watching your to see how it comes out,
Thread Starter
Junior Member
Joined: Dec 2006
Posts: 52
Likes: 0
From: Port Orchard, WA
Car: 1983 Z-28
Engine: 454
Transmission: TH700R4
Axle/Gears: 7.5" with 3.23 gears
Re: Turbo BBC
I kinda figured the turbo would be too small even for twins, which is why i need advice on which ones would be a good size.
as far as the ecm I have not figured that out yet. I got the fuel system kinda figured out. I removed the TBI fuel regulator and am going to be using a mallory by pass regulator that can be boost referenced (1 to 1 ratio I belive) Havent quite figured out the injector side of it yet, but according to my calculations I am going to need 270 Lbs per hour of fuel ( if i did it correctly) and I think that's as far as I gotten on figureing out exsactly what i am doing
Definatly need help!!!
oh and I am not really even sure what a AUJP prom is
as far as the ecm I have not figured that out yet. I got the fuel system kinda figured out. I removed the TBI fuel regulator and am going to be using a mallory by pass regulator that can be boost referenced (1 to 1 ratio I belive) Havent quite figured out the injector side of it yet, but according to my calculations I am going to need 270 Lbs per hour of fuel ( if i did it correctly) and I think that's as far as I gotten on figureing out exsactly what i am doing
Definatly need help!!!
oh and I am not really even sure what a AUJP prom is
Supreme Member
Joined: Nov 2010
Posts: 1,074
Likes: 9
From: VA
Car: 88 camaro irocz
Engine: l98 tpi
Transmission: 700r4
Axle/Gears: 2.77
Re: Turbo BBC
this is the turbo calculater i use to figure out whats needed :
http://www.squirrelpf.com/turbocalc/
http://www.squirrelpf.com/turbocalc/
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Re: Turbo BBC
JMO take the heads off, port them, give them a good valve job and then throw a decent cam in it and rev it a bit higher. Car Craft or Hot Rod did an article where they took a mildly cammed peanut ported 454 and made 440hp at the flywheel with a valve job and a cam. Forced induction is over kill for that mild of a goal IMO. Yeah, I realize these engines don't make much power from the factory but at the very least a cam would make a huge difference in the behavior of one of these 454s. Just saying it's probably horribly under cammed from the factory for emissions and milage.
It would also be a lot easier to tune this with what you have using a TBI setup. If it fit I'd love to do a Vortec 7400 system on one of these just because they're out there and not all that expensive. With a bit of work you could reach your goal I'd think and have killer torque in the process.
It would also be a lot easier to tune this with what you have using a TBI setup. If it fit I'd love to do a Vortec 7400 system on one of these just because they're out there and not all that expensive. With a bit of work you could reach your goal I'd think and have killer torque in the process.
Joined: Jul 2003
Posts: 10,521
Likes: 204
From: NYC / Jersey
Car: 1990 Trans Am GTA
Engine: Turbo 305 w/MS2
Transmission: 700R4
Re: Turbo BBC
Originally Posted by davesengineshop
450-500 dont wanna go too wild...
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From: Glen Park, NY
Car: 1987 IROC-Z
Engine: TPIS II Supercharged w/Nitrous
Transmission: 700R4 Probuilt
Axle/Gears: 3:73 Richmond 12 Bolt
Thread Starter
Junior Member
Joined: Dec 2006
Posts: 52
Likes: 0
From: Port Orchard, WA
Car: 1983 Z-28
Engine: 454
Transmission: TH700R4
Axle/Gears: 7.5" with 3.23 gears
Re: Turbo BBC
JMO take the heads off, port them, give them a good valve job and then throw a decent cam in it and rev it a bit higher. Car Craft or Hot Rod did an article where they took a mildly cammed peanut ported 454 and made 440hp at the flywheel with a valve job and a cam. Forced induction is over kill for that mild of a goal IMO. Yeah, I realize these engines don't make much power from the factory but at the very least a cam would make a huge difference in the behavior of one of these 454s. Just saying it's probably horribly under cammed from the factory for emissions and milage.
this is the turbo calculater i use to figure out whats needed :
http://www.squirrelpf.com/turbocalc/
http://www.squirrelpf.com/turbocalc/
You can make that without the turbo, not to mention save yourself a butt load of weight between the big block and turbo charger setup sitting in the engine bay. If your heart is set on the turbo, consider a custom rear mount setup. I know you said you have the headers figured out, but if you shove it all up front with that big block, expect to brake those tires loose way more than you expect, and in racing, your sixty foot is everything...
Joined: Jul 2003
Posts: 10,521
Likes: 204
From: NYC / Jersey
Car: 1990 Trans Am GTA
Engine: Turbo 305 w/MS2
Transmission: 700R4
Re: Turbo BBC
Originally Posted by davesengineshop
Well my heart isn't exsactly set on the turbo system Just some thing that I haven't done before. you do make a good point with the weight issue. Definatly something to think about... Thanks
- Rob
http://www.vortechsuperchargers.com/product.php?p=30
Thread Starter
Junior Member
Joined: Dec 2006
Posts: 52
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From: Port Orchard, WA
Car: 1983 Z-28
Engine: 454
Transmission: TH700R4
Axle/Gears: 7.5" with 3.23 gears
Re: Turbo BBC
If you go with the turbo, don't worry about your ECM tuning. The amount of boost you will need to realize your goals will be 10-psi at the most, so look into a Vortech SFMU, they work extremely well for what they are. Just be sure you have a quality fuel pump that will take the abuse, as well as injectors, then select the correct ratio to dial it all in. You can have a custom prom, or EFI installed down the road, but from those that I know who run this unit, they have been happy ever since with it. Good luck...
- Rob
http://www.vortechsuperchargers.com/product.php?p=30
- Rob
http://www.vortechsuperchargers.com/product.php?p=30
Hmm I wonder what i did wrong...was that one or two turbo's?
Senior Member
Joined: Mar 2012
Posts: 553
Likes: 1
From: Ballwin, MO
Car: 1987 Trans Am
Engine: 355 tpi
Transmission: 5 speed
Re: Turbo BBC
Well I do not want to high jack this thread, As of right now I do not know exactly what I'm going to do with in the tune, there are those on this site that know exactly what is needed, Right now I just finished with the rebuild of my motor for this heavy and I mean heavy RV , As soon as I get the old motor out and my new one installed I will build my header and turbo system , But that may wait until next winter, For now just getting my new motor in before race season start is my goal, as this is my tow rig,
Thread Starter
Junior Member
Joined: Dec 2006
Posts: 52
Likes: 0
From: Port Orchard, WA
Car: 1983 Z-28
Engine: 454
Transmission: TH700R4
Axle/Gears: 7.5" with 3.23 gears
Re: Turbo BBC
LOL Once race season starts, everything gets put on hold! Its getting close and my car isnt finished yet!
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