Results of 305 TB to 454 TB swap
10-02-2001, 02:43 PM
#1
Member
Thread Starter
Join Date: Apr 2000
Location: Denver, colorado
Posts: 444
Likes: 0
Received 0 Likes
on
0 Posts
Results of 305 TB to 454 TB swap
I finally completed my swap from the stock 1 11/16 TB unit with cop injectors to the 454 TB unit with the SAME injectors.when I did my engine swap (check sig) I just upgraded the injectors and left the TB unit alone.
With the Small TB unit I lost power after 5,000 rpm, like a hitting a brick wall.I Bored out the edelbrock TBI manifold to 2" and bolted on the 454 unit. NOthing else was changed including the cop chip. I am now pulling to 6,500 rpm.
Given that the only change I made was the TB unit itself, I at least know it is good for another 1500 rpm on the top end with no other changes. The true test would have been to do a custom prom for the small TB set up and compare that to the large TB set up with a custom chip. I didn't have the money to do that, but It provides some evidence that the smaller TB unit is inadequate in the higher RPM ranges and for my motor combination the larger TB is the way to go. I am taking it in to Dave Johnson here in denver for a custom chip later this week so we shall see
how it turns out. Anyway, thought you guys would like to know my results. Snflu, Thanks for all of your help. No way I could do this without you..........bob
------------------
91 camaro RS convert,GM crate 350 with LT1 cam,edelbrock 6085 heads,9.5:1 comp, edelbrock TBI intake, 65# injectors, GM cop chip,dual fan conversion,
ultimate TBI mods,TBI spacer,SLP 1 5/8 headers,
3"cat back,Flowmaster,
T-5, centerforce 2 clutch, 3.42 torsen posi,alston SFC's,Global West LCA relocation brackets, edelbrock STB
With the Small TB unit I lost power after 5,000 rpm, like a hitting a brick wall.I Bored out the edelbrock TBI manifold to 2" and bolted on the 454 unit. NOthing else was changed including the cop chip. I am now pulling to 6,500 rpm.
Given that the only change I made was the TB unit itself, I at least know it is good for another 1500 rpm on the top end with no other changes. The true test would have been to do a custom prom for the small TB set up and compare that to the large TB set up with a custom chip. I didn't have the money to do that, but It provides some evidence that the smaller TB unit is inadequate in the higher RPM ranges and for my motor combination the larger TB is the way to go. I am taking it in to Dave Johnson here in denver for a custom chip later this week so we shall see
how it turns out. Anyway, thought you guys would like to know my results. Snflu, Thanks for all of your help. No way I could do this without you..........bob
------------------
91 camaro RS convert,GM crate 350 with LT1 cam,edelbrock 6085 heads,9.5:1 comp, edelbrock TBI intake, 65# injectors, GM cop chip,dual fan conversion,
ultimate TBI mods,TBI spacer,SLP 1 5/8 headers,
3"cat back,Flowmaster,
T-5, centerforce 2 clutch, 3.42 torsen posi,alston SFC's,Global West LCA relocation brackets, edelbrock STB
10-02-2001, 03:26 PM
#2
Supreme Member
Join Date: Nov 1999
Location: Charlotte, NC
Posts: 1,069
Received 0 Likes
on
0 Posts
Car: 1991 Camaro RS
Engine: GMPP 350 HO w/TBI
Transmission: 700R-4
Axle/Gears: 10-bolt w/3.73s
bob...congrats! it's been a while since i have known what the hell has been going on around here, but its good to see that you got your setup running well.
-Brian
------------------
1991 Camaro RS - ultra blue metallic, t-tops
GMPP 350 HO crate engine - 454 TBI, MSD ignition, SLP exhaust, everything is new
700R4 - 2,400 stall converter, vette servo, shift kit
z28boy.cz28.com
Central New York F-Body Association
z28boy@twcny.rr.com AIM - "Z28 Boy"
1998 Pontiac Grand Prix GT - 2 door, black
-Brian
------------------
1991 Camaro RS - ultra blue metallic, t-tops
GMPP 350 HO crate engine - 454 TBI, MSD ignition, SLP exhaust, everything is new
700R4 - 2,400 stall converter, vette servo, shift kit
z28boy.cz28.com
Central New York F-Body Association
z28boy@twcny.rr.com AIM - "Z28 Boy"
1998 Pontiac Grand Prix GT - 2 door, black
10-02-2001, 05:38 PM
#3
Senior Member
Join Date: Sep 2000
Location: Austin TX
Posts: 560
Likes: 0
Received 1 Like
on
1 Post
Car: 91 RS Convertible
Engine: 355
Transmission: 700R4
Axle/Gears: 2.73 peg leg
Sounds like your setup is similar to mine without the TB. Good to hear. I wonder if at least some of your problems above 5000 rpms are those heads (?). Say, what's the P/N for that chip? I think I just ordered one but I"m not sure. DO you have any times yet?
10-02-2001, 06:08 PM
#4
? I thought the edelbrock intake was too thin to bore to 2"? 
------------------
-Tas
'89 Formula WS-6
305, TBI, auto, 14x3 chrome flat based open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....
To be installed eventually far far far into the future: Yours if the price is right and I don't have to ship
:
Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248), Catco 3" cat, and injector spacer.
Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options
AOL IM: superGRtaz
Got Beach?
------------------
-Tas
'89 Formula WS-6
305, TBI, auto, 14x3 chrome flat based open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....
To be installed eventually far far far into the future: Yours if the price is right and I don't have to ship
:Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248), Catco 3" cat, and injector spacer.
Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options
AOL IM: superGRtaz
Got Beach?
10-07-2001, 09:54 PM
#6
Member
Thread Starter
Join Date: Apr 2000
Location: Denver, colorado
Posts: 444
Likes: 0
Received 0 Likes
on
0 Posts
Jroy91rs, the cop chip has 86anlu K3911910047 on it and has a part number of 16144294. It is in the GM SEO catalogue for
1989 caprice cop car with a 350. I have also heard that part number 16125841 is the same chip but I don't know. Do a search cause there was another post about this chip with some numbers.
Tas, I didn't think you could bore the edelbrock TBI intake to 2" either. But I ran into a guy who had one and had seen others do it. There was a post on here a while back saying it couldn't be done, but I have one and it can. The machinist has to be right on though. Its a total bolt on deal, just bore it, and bolt it on. No other mods required like the carb version requires. But I can see the advantages to a single plane carb
intake for sure.
I will let you guys know how well this works when I get the car back next week with the new custom chip.............bob
------------------
91 camaro RS convert,GM crate 350 with LT1 cam,edelbrock 6085 heads,9.5:1 comp, edelbrock TBI intake, 65# injectors, GM cop chip,dual fan conversion,
ultimate TBI mods,TBI spacer,SLP 1 5/8 headers,
3"cat back,Flowmaster,
T-5, centerforce 2 clutch, 3.42 torsen posi,alston SFC's,Global West LCA relocation brackets, edelbrock STB
1989 caprice cop car with a 350. I have also heard that part number 16125841 is the same chip but I don't know. Do a search cause there was another post about this chip with some numbers.
Tas, I didn't think you could bore the edelbrock TBI intake to 2" either. But I ran into a guy who had one and had seen others do it. There was a post on here a while back saying it couldn't be done, but I have one and it can. The machinist has to be right on though. Its a total bolt on deal, just bore it, and bolt it on. No other mods required like the carb version requires. But I can see the advantages to a single plane carb
intake for sure.
I will let you guys know how well this works when I get the car back next week with the new custom chip.............bob
------------------
91 camaro RS convert,GM crate 350 with LT1 cam,edelbrock 6085 heads,9.5:1 comp, edelbrock TBI intake, 65# injectors, GM cop chip,dual fan conversion,
ultimate TBI mods,TBI spacer,SLP 1 5/8 headers,
3"cat back,Flowmaster,
T-5, centerforce 2 clutch, 3.42 torsen posi,alston SFC's,Global West LCA relocation brackets, edelbrock STB
Trending Topics
Thread
Thread Starter
Forum
Replies
Last Post
Fast355
DFI and ECM
14
12-02-2016 06:33 PM
