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Big bore TBI's (Read 11956 times)
RATFINK
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Big bore TBI's
06/20/15 at 07:24:19
 
Occasionally I get a request to build a JimD style big bore TBI since Jim passed on his blueprints and wealth of information to me several years ago when he fully retired from the hobby... Time and my health issues prevent me from actually being able to build any however.

That having been said, I have a retired friend who was a machinist for over 40 years and he has expressed an interest in perhaps building some of these with a couple of upgrades on Jim's original design which worked very well.

The only catch to this is the fact that this type of modification is extremely labor intensive so building one piece at a time isn't economically viable for the builder or seller; however if you guys are interested and we can come up with a minimum order for at least 5 units the price should be tolerable, more than 5 and he can probably do a smoking deal.

The actual cost per unit will depend on exactly how many are being built, more TBI's = cheaper price per unit.

He can also provide full rebuild service for the TBI with all new gaskets, seals, o-rings, filters, and US cleaned flow matched injectors at whatever psi you want to run.

If this sounds like something you guys would be interested in post up and we'll see if there is enough interest out there to make a setup and CNC some of these jewels out.  Grin
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Say whatever you like about the south.... but you never hear about anyone retiring and moving north.
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Rock454
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Re: Big bore TBI's
Reply #1 - 06/21/15 at 23:50:33
 
These are the biggest out there boys.  End up in the 900 cfm plus range and are high quality work.  I have a JimD version that is waiting for a reason to go on.  There is not another one out there that will flow as much.
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2004 Yukon - Magnaflow cat back
2008 STS 4.6 Northstar AWD
2014 Chrysler Town & Country "sliding door car"
1990 454SS Whipple charged 7 psi, Edelbrock Performer TBI intake, Edelbrock TES, Borla Cat back, heated O2, Eaton limited slip, 2/4 lowered, Gear Vendor Overdrive, Belltech Rear Sway Bar, 13.54 sec @ 100.02 1/4 mile
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strcdan
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Re: Big bore TBI's
Reply #2 - 06/22/15 at 19:31:38
 
What does this do for our trucks?
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caleb
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Re: Big bore TBI's
Reply #3 - 06/27/15 at 19:04:33
 
I need one of these! Anyone else?
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LeadFoot
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Re: Big bore TBI's
Reply #4 - 06/27/15 at 20:49:23
 
Will allow the engine to breath    its been a while since I been on here so I can't remember if our tbi's were 570 cfm or 670 but going to 900 cfm is a huge upgrade and my opinion if you plan on keeping tbi setup I'd jump on it as jim was the only guy on the planet doin this that I knew of and being he's retired people should jump all over this
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1990 454ss ,4:10 gear,New Eaton posi unit with carbon fiber clutches , T400 , Edelbrock Heads ,Ededbrock Headers,& intake, Edelbrock 2162.. Holley Adjustable Fuel pressure reg, Walbro 255 fuel Pump .30 over bottom end,<for Now! Quick Fuel 750 vac Drag Race version,1.7 Comp Usa Rocker's,Comp Cam's Hardened Pushrods, 3" Flowmaster, MSD 6al box ,Underdrive Pulley's,4 Wire 02.Rollmaster Timming set,
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Jim D
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Re: Big bore TBI's
Reply #5 - 06/28/15 at 13:19:34
 
The reason I did this modification originally was to get past the smog cops in Calif. where the vehicle MUST pass a visual inspection. The bored out unit looks absolutely stock from the outside.   Cool

The reason I stopped doing them was I became "bored" with doing it after modifying  over 30 of them.   Roll Eyes
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'93 454SS with a Whipple

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LeadFoot
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Re: Big bore TBI's
Reply #6 - 06/28/15 at 21:23:52
 
Max hp out of a stock tbi jim?? Then your unit??
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1990 454ss ,4:10 gear,New Eaton posi unit with carbon fiber clutches , T400 , Edelbrock Heads ,Ededbrock Headers,& intake, Edelbrock 2162.. Holley Adjustable Fuel pressure reg, Walbro 255 fuel Pump .30 over bottom end,<for Now! Quick Fuel 750 vac Drag Race version,1.7 Comp Usa Rocker's,Comp Cam's Hardened Pushrods, 3" Flowmaster, MSD 6al box ,Underdrive Pulley's,4 Wire 02.Rollmaster Timming set,
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TexasSS
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Re: Big bore TBI's
Reply #7 - 06/29/15 at 09:50:33
 
I am in the process of rebuilding my SS. I may be interested as well. Smiley
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Rock454
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Re: Big bore TBI's
Reply #8 - 06/29/15 at 21:35:26
 
Stock is 670 cfm and Jim's design gets over 900 cfm and looks stock as can be from the outside.
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...
2004 Yukon - Magnaflow cat back
2008 STS 4.6 Northstar AWD
2014 Chrysler Town & Country "sliding door car"
1990 454SS Whipple charged 7 psi, Edelbrock Performer TBI intake, Edelbrock TES, Borla Cat back, heated O2, Eaton limited slip, 2/4 lowered, Gear Vendor Overdrive, Belltech Rear Sway Bar, 13.54 sec @ 100.02 1/4 mile
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derek
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Re: Big bore TBI's
Reply #9 - 07/03/15 at 07:07:13
 
So will this be a new unit, or are we supplying one to be modified?

I have a spare just waiting in case.  Smiley
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1990 454SS  Ram-air, water injection, Borla exhaust,  700R4 transmission, MSD6AL, K&N, and smokin' 31/10.50/15's.
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RATFINK
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Re: Big bore TBI's
Reply #10 - 07/03/15 at 22:18:15
 
derek wrote on 07/03/15 at 07:07:13:
So will this be a new unit, or are we supplying one to be modified?

I have a spare just waiting in case.  Smiley


It would be a used factory casting and throttle shaft, pretty much every thing else is new and custom machined.

I have a few castings, but normally I would want a core.
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Say whatever you like about the south.... but you never hear about anyone retiring and moving north.
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wht93454ss
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Re: Big bore TBI's
Reply #11 - 07/04/15 at 17:21:18
 
Would this benefit me at all installing this on top of the edelbrock multipoint efi system or hurt me since these systems are tuned for mostly stock engines?
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Jim D
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Re: Big bore TBI's
Reply #12 - 07/04/15 at 19:11:14
 
Interesting you should ask this.

I originally did this because I had the Edel MPFI set up on my '90.

Worked like a charm.

<----  look at the picture, there it is on the Edel system

and read this:   http://www.454ss.com/gallery/JimD/JimD_TBI.htm

No, I don't have one on my '93, with the Whipple on it why bother?
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'93 454SS with a Whipple

My COF credo:
SANITY is back-ordered
SARCASM is in unlimited supply
I was taught to respect my elders - it's just getting harder to find them.
 
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derek
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Re: Big bore TBI's
Reply #13 - 07/09/15 at 17:24:26
 
I'm in.   Cool
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1990 454SS  Ram-air, water injection, Borla exhaust,  700R4 transmission, MSD6AL, K&N, and smokin' 31/10.50/15's.
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caleb
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Re: Big bore TBI's
Reply #14 - 07/11/15 at 23:20:40
 
Me too
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