L98 TPI to Carb - CorvetteForum - Chevrolet Corvette Forum Discussion

Register FAQ Search Today's Posts Mark Forums Read Vendor Directory

C4 Tech/Performance
L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

L98 TPI to Carb

Reply
 
 
 
Thread Tools Search this Thread
Old 03-29-2009, 07:37 AM   #1
snowmanmdp
CF Senior Member
Thread Starter
 
snowmanmdp's Avatar
 
Member Since: Apr 2008
Location: Waterford Michigan
Posts: 1,178
Thanks: 0
Thanked 1 Time in 1 Post
Default L98 TPI to Carb

Who has switched over from TPI to a Carb and did it make a difference?
Were you able to pick up RPM's with the switch, I know I will lose mpg's but I put less than 500 miles on my vette last year. I also am not picking up on the fuel injection. Just looking for some input
snowmanmdp is offline   Reply With Quote
Old 03-29-2009, 07:53 AM   #2
rodj
CF Senior Member
 
rodj's Avatar
 
Member Since: Aug 2000
Location: Sydney Australia
Posts: 8,836
Thanks: 0
Thanked 3 Times in 3 Posts
Default

Quote:
Originally Posted by snowmanmdp View Post
Who has switched over from TPI to a Carb and did it make a difference?
Difference in what ?
Read
http://forums.corvetteforum.com/sear...rchid=10180086
rodj is offline   Reply With Quote
Old 03-29-2009, 08:19 AM   #3
Bruce Witherspoon
CF Senior Member
 
Member Since: Nov 2002
Location: Lansing MI
Posts: 686
Thanks: 0
Thanked 2 Times in 2 Posts
Default

Quote:
Originally Posted by snowmanmdp View Post
Who has switched over from TPI to a Carb and did it make a difference?
Were you able to pick up RPM's with the switch, I know I will lose mpg's but I put less than 500 miles on my vette last year. I also am not picking up on the fuel injection. Just looking for some input
I guess I would question what issues you have with the fuel injection? And what you mean by more r.p.m. There will be issues with hood clearance to the carb given that the car was not designed to have a carb sitting on the top of the engine. Not saying it can be done, just curious why?
Bruce Witherspoon is offline   Reply With Quote
Old 03-29-2009, 08:35 AM   #4
Elephanthead
CF Senior Member
 
Member Since: Jul 2008
Posts: 317
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Lets face it the C4 is not cutting edge technology, its main appeal is its roadster like ride qualities. I grew up driving carbed cars, and that is what I like, same thing with a manual transmission. If you want to be chauffeured around by a robot, go ahead, but don't cry when the machines take over and you can't do anything for yourself.
Elephanthead is offline   Reply With Quote
Old 03-29-2009, 09:04 AM   #5
rodj
CF Senior Member
 
rodj's Avatar
 
Member Since: Aug 2000
Location: Sydney Australia
Posts: 8,836
Thanks: 0
Thanked 3 Times in 3 Posts
Default

Quote:
Originally Posted by Elephanthead View Post
Lets face it the C4 is not cutting edge technology,
It was when it first came out 25 years ago , just like the C6 is now.
Still using your 8 track?

Last edited by rodj; 03-29-2009 at 09:06 AM.
rodj is offline   Reply With Quote
Old 03-29-2009, 09:32 AM   #6
WW7
CF Senior Member
 
WW7's Avatar
 
Member Since: Aug 2007
Posts: 7,780
Thanked 133 Times in 117 Posts
Default

If you carb it, you should get higher rpms just like the 350s of old. The TPI is whats holding the L98 from achieving that (along with a restrictive exhaust). Im not sure what the horsepower increase will be with a carb on the L98, but there is a engine Im thinking about getting called the ZZ4 that is rated at 355hp with a carb,but with the tpi that I have now will only be about 265hp, so you can see there is a great difference in hp between TPI and carb. Higher power can be achievied with TPI but the cost is much greater.I personally won"t go to carb, because thats not how the car was built originally,but if power is what you want, it can be gotten cheaper and easier with a carb..WW

Last edited by WW7; 03-29-2009 at 09:34 AM.
WW7 is offline   Reply With Quote
Old 03-29-2009, 09:51 AM   #7
MR NICE
CF Senior Member
 
MR NICE's Avatar
 
Member Since: Nov 2005
Location: Downriver Mi.
Posts: 1,361
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by WW7 View Post
If you carb it, you should get higher rpms just like the 350s of old. The TPI is whats holding the L98 from achieving that (along with a restrictive exhaust). Im not sure what the horsepower increase will be with a carb on the L98, but there is a engine Im thinking about getting called the ZZ4 that is rated at 355hp with a carb,but with the tpi that I have now will only be about 265hp, so you can see there is a great difference in hp between TPI and carb. Higher power can be achievied with TPI but the cost is much greater.I personally won"t go to carb, because thats not how the car was built originally,but if power is what you want, it can be gotten cheaper and easier with a carb..WW
Switching to a carb is not cheap,Intake,carb,air cleaner,FPR,Dizzy,TV cable bracket
MR NICE is offline   Reply With Quote
Old 03-29-2009, 10:04 AM   #8
WW7
CF Senior Member
 
WW7's Avatar
 
Member Since: Aug 2007
Posts: 7,780
Thanked 133 Times in 117 Posts
Default

Quote:
Originally Posted by MR NICE View Post
Switching to a carb is not cheap,Intake,carb,air cleaner,FPR,Dizzy,TV cable bracket
Nothing is cheap nowadays but a lot of this can be bought used on ebay an other sites fairly inexpensively. Just go to ebay an do a seach on 350 intakes or carbs and see if you don't come up with hundreds of items...WW

Last edited by WW7; 03-29-2009 at 12:46 PM.
WW7 is offline   Reply With Quote
Old 03-29-2009, 10:33 AM   #9
Bruce Witherspoon
CF Senior Member
 
Member Since: Nov 2002
Location: Lansing MI
Posts: 686
Thanks: 0
Thanked 2 Times in 2 Posts
Default

Quote:
Originally Posted by WW7 View Post
If you carb it, you should get higher rpms just like the 350s of old. The TPI is whats holding the L98 from achieving that (along with a restrictive exhaust). Im not sure what the horsepower increase will be with a carb on the L98, but there is a engine Im thinking about getting called the ZZ4 that is rated at 355hp with a carb,but with the tpi that I have now will only be about 265hp, so you can see there is a great difference in hp between TPI and carb. Higher power can be achievied with TPI but the cost is much greater.I personally won"t go to carb, because thats not how the car was built originally,but if power is what you want, it can be gotten cheaper and easier with a carb..WW
Not sure how you equate a carb with higher engine speed? The L98 was designed to make h.p./torge in an era when fuel and emission were the still the controlling factor in engine development. As some one already eluded, even the LS9 which makes in excess of 600 h.p. does not run at what would be considered high engine speeds.
I agree that a better intake manifold would increase both the engine operating speed as well as some of the usable horsepower, but for the sacrifice of the lower end torque.
Trying a larger throttlebody and a les restrictive manifold might surprise you. There are numerous articles that you can find on the Web that show improvements in h.p. by increaseing the intake flow and decreasing the exhaust back pressure.
Bruce Witherspoon is offline   Reply With Quote
Old 03-29-2009, 11:03 AM   #10
snowmanmdp
CF Senior Member
Thread Starter
 
snowmanmdp's Avatar
 
Member Since: Apr 2008
Location: Waterford Michigan
Posts: 1,178
Thanks: 0
Thanked 1 Time in 1 Post
Default

Quote:
Originally Posted by rodj View Post
Nothing comes up.
snowmanmdp is offline   Reply With Quote
Old 03-29-2009, 11:06 AM   #11
Never Satisfied
CF Senior Member
 
Never Satisfied's Avatar
 
Member Since: Sep 2008
Location: Lafayette Indiana
Posts: 222
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by MR NICE View Post
Switching to a carb is not cheap,Intake,carb,air cleaner,FPR,Dizzy,TV cable bracket

Maybe a dumb question, but why would the distributor need switched out?
Never Satisfied is offline   Reply With Quote
Old 03-29-2009, 11:08 AM   #12
snowmanmdp
CF Senior Member
Thread Starter
 
snowmanmdp's Avatar
 
Member Since: Apr 2008
Location: Waterford Michigan
Posts: 1,178
Thanks: 0
Thanked 1 Time in 1 Post
Default

Quote:
Originally Posted by Bruce Witherspoon View Post
I guess I would question what issues you have with the fuel injection? And what you mean by more r.p.m. There will be issues with hood clearance to the carb given that the car was not designed to have a carb sitting on the top of the engine. Not saying it can be done, just curious why?
I hate fuel injection I grew up with carbs and understand them. It's just that simple for me....I've seen it done so I don't think unless I get crazy with a high rise intake and spacers it should fit under the hood.
snowmanmdp is offline   Reply With Quote
Old 03-29-2009, 11:17 AM   #13
856SPEED
CF Senior Member
 
856SPEED's Avatar
 
Member Since: Apr 2007
Location: O'Fallon Missouri
Posts: 1,941
Thanked 20 Times in 20 Posts
Default

you're starting w/the wrong Vette.......should have bought an older model equipped w/a carb. if that's what you like.....
856SPEED is offline   Reply With Quote
Old 03-29-2009, 11:29 AM   #14
snowmanmdp
CF Senior Member
Thread Starter
 
snowmanmdp's Avatar
 
Member Since: Apr 2008
Location: Waterford Michigan
Posts: 1,178
Thanks: 0
Thanked 1 Time in 1 Post
Default

Quote:
Originally Posted by 856SPEED View Post
you're starting w/the wrong Vette.......should have bought an older model equipped w/a carb. if that's what you like.....
This one basically fell in my lap....I took it in as a trade on a snowmobile....But if it was a case of buying what I really wanted, it would have been a split window big block.
snowmanmdp is offline   Reply With Quote
Old 03-29-2009, 11:33 AM   #15
Pete K
CF Senior Member
 
Pete K's Avatar
 
Member Since: Feb 2004
Posts: 12,516
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Be very careful with the transmission TV cable. Carb swaps require dedicated, specific brackets, and careful TV linkage tweakings to allow the trans to remain alive. If the tv is wrong, trans will eat itself up quickly.
Pete K is offline   Reply With Quote
Old 03-29-2009, 11:40 AM   #16
856SPEED
CF Senior Member
 
856SPEED's Avatar
 
Member Since: Apr 2007
Location: O'Fallon Missouri
Posts: 1,941
Thanked 20 Times in 20 Posts
Default

Quote:
Originally Posted by snowmanmdp View Post
This one basically fell in my lap....I took it in as a trade on a snowmobile....But if it was a case of buying what I really wanted, it would have been a split window big block.


I understand; maybe sell it and buy something else?
856SPEED is offline   Reply With Quote
Old 03-29-2009, 11:40 AM   #17
snowmanmdp
CF Senior Member
Thread Starter
 
snowmanmdp's Avatar
 
Member Since: Apr 2008
Location: Waterford Michigan
Posts: 1,178
Thanks: 0
Thanked 1 Time in 1 Post
Default

Quote:
Originally Posted by Pete K View Post
Be very careful with the transmission TV cable. Carb swaps require dedicated, specific brackets, and careful TV linkage tweakings to allow the trans to remain alive. If the tv is wrong, trans will eat itself up quickly.
Thanks for the tip....I work in a prototype shop, so I think if I switch over the brackets and cables will be hand made...we did all the prototype cables for the Dodge Challengers.
snowmanmdp is offline   Reply With Quote
Old 03-29-2009, 11:40 AM   #18
CorvetteMike2004
CF Senior Member
Support Corvetteforum!
 
CorvetteMike2004's Avatar
 
Member Since: Oct 2007
Posts: 4,998
Thanks: 0
Thanked 0 Times in 0 Posts
Default 63

Quote:
Originally Posted by snowmanmdp View Post
This one basically fell in my lap....I took it in as a trade on a snowmobile....But if it was a case of buying what I really wanted, it would have been a split window big block.

So when are you buying the 63?

Last edited by CorvetteMike2004; 03-29-2009 at 11:44 AM.
CorvetteMike2004 is offline   Reply With Quote
Old 03-29-2009, 11:42 AM   #19
Pete K
CF Senior Member
 
Pete K's Avatar
 
Member Since: Feb 2004
Posts: 12,516
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by snowmanmdp View Post
Thanks for the tip....I work in a prototype shop, so I think if I switch over the brackets and cables will be hand made...we did all the prototype cables for the Dodge Challengers.
Happy to help. Most carb swap guys do not realize it is a throttle valve cable, and not a kickdown cable like the old turbo 350's.

Not a big deal to get them set up properly, but overlooked often.
If I can help, let me know.
Pete K is offline   Reply With Quote
Old 03-29-2009, 11:50 AM   #20
snowmanmdp
CF Senior Member
Thread Starter
 
snowmanmdp's Avatar
 
Member Since: Apr 2008
Location: Waterford Michigan
Posts: 1,178
Thanks: 0
Thanked 1 Time in 1 Post
Default

Quote:
Originally Posted by 856SPEED View Post


I understand; maybe sell it and buy something else?
I like the car... I don't see many Gold 85's or any other years for that matter. I already have put on a ported and polished plenium with bigger runners and a set of Hooker ceramic headers and stainless steel magnaflows...not to mention the ZR1 wheels and recovering the seats. I like being able to work on the car myself and I can't work on the fuel injection....My grandfather worked at holley for 40 years and he told me that the reason they came up with EFI is so you can't work on it.
snowmanmdp is offline   Reply With Quote
Go Back   CorvetteForum - Chevrolet Corvette Forum Discussion >
Reload this Page
  • L98 TPI to Carb
  •  
     
    Reply

    Related Topics
    Thread Thread Starter Forum Replies Last Post
    tpi trade for carb system mitchpdavis C4 Parts for Sale/Wanted 0 01-26-2015 10:59 PM
    Tach wire on carbed 87 scoates C4 Tech/Performance 4 08-07-2009 06:15 AM
    What size are fuel line fittings? DrEvil11417 C4 Tech/Performance 3 08-04-2007 11:58 AM
    Fuel Pump for TPI and Carb? Such a Thing? sharkman76 C3 Tech/Performance 2 01-23-2005 07:00 PM
    TPI conversion in 77 dogboy C3 Tech/Performance 12 01-03-2003 03:24 PM


    Tags
    c4, carb, carbed, carbuator, carburetor, conversion, corvette, efi, fuel, headers, hp, increase, l98, swap, tpi

    Thread Tools Search this Thread
    Search this Thread:

    Click for Advanced Search

    Posting Rules
    You may not post new threads
    You may not post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are Off
    Pingbacks are Off
    Refbacks are Off

    Forum Jump


    All times are GMT -4. The time now is 06:34 AM.