TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

TBI vs Holley Carb

Thread Tools
 
Search this Thread
 
Old 06-20-2011, 01:11 AM
  #1  
Supreme Member

Thread Starter
iTrader: (2)
 
Fast355's Avatar
 
Join Date: Jan 2005
Location: Hurst, Texas
Posts: 10,040
Received 394 Likes on 336 Posts
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
TBI vs Holley Carb

So I am going to finally get around to playing with something I have been wanting to do for a while. I have had my van TPI forever and a day and ready to make the van more strip oriented. I don't drive it much on the street and no longer have to pass a dyno emissions test. I have a nice little 6" rod 383 in the van with my heavily ported 906 vortecs on it. It has a custom grind Reed cam in it, but I still have a GM 846 and 847 laying around. I will be opening up the exhaust and ditching my flowmaster 40s for magnaflow straight through mufflers. I will put the dual cut-outs before the muffler. The edelbrock TPI base will be coming off along with the SLP runners. In their place I am going to put the Edelbrock Victor Jr 4bbl Vortec intake. For the TBI I have a marine TBI from a 375 HP 502 BBC and matching squarebore adapter. For a carb I have a Holley 600 cfm with a TPS I attached in place of the choke. I will be doing some track runs using both the BBC TBI and the Holley 4-bbl carb. For fairness I will be tweaking both of them and use the same ignition and transmission settings for both. Should be interesting when I get around to doing it all. The transmission is a 2,600 stalled stock rebuild 4L60E with a Transgo HDII shift kit, controlled by the 427 TBI PCM. My 1-2 shift will likely be in the 6,500 rpm range and 2-3 in the 6,250 range. With the 3.08 gears I will trap the 1/8 mile at roughly 75-80 mph and a mere 5,500 rpm in 2nd. I have some interesting approaches to try and you guys may like them. I will keep you'll posted. I still have this gut feeling the Marine TBI is going to hand the carb its venturis. I will also be stripping the van from 5,500 lbs down to a mere 4,500 lbs by removing the whole conversion interior, the rear a/c unit that has not been hooked up the past two years carpeting, etc. It will basically be a metal box with conversion van windows and running boards. Eventually I will stuff the rear-end with 4.56s and some form of locker. Should be fun beating these so called racecars I want an 7.99 pass out of this beast on motor and be able to drive it home with the a/c blasting.
Old 06-20-2011, 07:53 AM
  #2  
Senior Member
iTrader: (1)
 
SinthetikIroc's Avatar
 
Join Date: Aug 2002
Location: Haverhill, Ma
Posts: 542
Likes: 0
Received 0 Likes on 0 Posts
Car: Corvette
Engine: 5.7
Transmission: 700R4
Re: TBI vs Holley Carb

I am interested in what you can do with the TBI. I have always dug your posts here and on the fullsize chevy sites.
Old 06-20-2011, 10:48 AM
  #3  
Supreme Member

iTrader: (25)
 
UnderCover89TBI's Avatar
 
Join Date: Feb 2006
Location: Manteca,California. Nor Cal.
Posts: 7,260
Likes: 0
Received 5 Likes on 5 Posts
Car: SOLD IT. Mopar guy only now.
Engine: gone
Transmission: gone
Axle/Gears: gone
Re: TBI vs Holley Carb

Awesome. I'd like to see this done and see the info. Keep the TBI alive! post up the info as soon as you can Fast
Old 06-20-2011, 09:25 PM
  #4  
Supreme Member

Thread Starter
iTrader: (2)
 
Fast355's Avatar
 
Join Date: Jan 2005
Location: Hurst, Texas
Posts: 10,040
Received 394 Likes on 336 Posts
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: TBI vs Holley Carb

Took a couple of quick pictures today.





Attached Thumbnails TBI vs Holley Carb-img00287.jpg   TBI vs Holley Carb-img00288.jpg   TBI vs Holley Carb-img00292.jpg  
Old 06-20-2011, 09:58 PM
  #5  
Supreme Member

iTrader: (25)
 
UnderCover89TBI's Avatar
 
Join Date: Feb 2006
Location: Manteca,California. Nor Cal.
Posts: 7,260
Likes: 0
Received 5 Likes on 5 Posts
Car: SOLD IT. Mopar guy only now.
Engine: gone
Transmission: gone
Axle/Gears: gone
Re: TBI vs Holley Carb

I see mopar papers....
Old 06-20-2011, 10:45 PM
  #6  
Supreme Member

Thread Starter
iTrader: (2)
 
Fast355's Avatar
 
Join Date: Jan 2005
Location: Hurst, Texas
Posts: 10,040
Received 394 Likes on 336 Posts
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: TBI vs Holley Carb

Originally Posted by UnderCover89TBI
I see mopar papers....
4.7 parts for my brothers 03 Dakota.

Thats a mopar compressor for my 4.7 Ram too, except its got a 5.7 now.

http://www.youtube.com/watch?v=pySofWYQeG0
Old 06-20-2011, 11:16 PM
  #7  
Member

iTrader: (1)
 
morgsie's Avatar
 
Join Date: Feb 2008
Posts: 454
Received 6 Likes on 6 Posts
Re: TBI vs Holley Carb

TBI will be MAF like it was before the TPI?
Old 06-20-2011, 11:28 PM
  #8  
Supreme Member

Thread Starter
iTrader: (2)
 
Fast355's Avatar
 
Join Date: Jan 2005
Location: Hurst, Texas
Posts: 10,040
Received 394 Likes on 336 Posts
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: TBI vs Holley Carb

Originally Posted by morgsie
TBI will be MAF like it was before the TPI?
Actually planning to run just the 7427 in Speed Density mode. Going to see how well I can get the lumpy cam tamed with it.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
86CamaroDan
Engine/Drivetrain/Suspension Parts for Sale
2
09-29-2015 10:08 PM
Slush92RS
LTX and LSX
3
09-02-2015 08:56 PM
Dialed_In
Firebirds for Sale
2
08-20-2015 01:45 PM
tero
Electronics
0
08-15-2015 02:47 PM
tero
Engine Swap
7
08-06-2015 06:34 PM



Quick Reply: TBI vs Holley Carb



All times are GMT -5. The time now is 12:28 AM.