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  #1  
Old 01-27-2012, 12:10 PM
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Subic Jeep Subic Jeep is offline
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Location: Philippines
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Question GM TBI more power needed

Got a GM TBI on a SBC 350 V8 need more power My Cherokee is heavy over 7000 lbs and on 39.5 inch rubbers.

I was thinking of adding a TBI UNIT: 670 CFM Holley 2-bbl with 80lb/hr Injector

Quote:
Holley 670 CFM adapted for use with Howell or GM wiring harness and ECM. Uses special Howell calibration PROM. Includes idle speed control by ECM. Suitable for high-RPM small block application and low performance big blocks. With 80 lb./hr. injectors.



This is a investment of 450$ plus the chip 250$ ....

Your comments please!
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Lars

I am in the five bananas category!
Cherokee 1981 officially 1974 huh local irony
Gen 1 GM-SB 350 V8 TBI - TH400 - Klune V - Twin stick NP205 w. Nippon shifter
Dana 60 w. ARB locker, hydraulic assist + GM 14FF w. Detroit locker.4-link rear on LC80 19mm coils
Rancho 5036 Shocks 14 inch travel. 39.5x15.5x15 TSL
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  #2  
Old 01-27-2012, 01:11 PM
okjeep okjeep is offline
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Join Date: Jan 08, 2008
Location: Tulsa
Posts: 359
Don't do it. Look at the upsized unit from CFM-Tech (http://www.cfm-tech.com/). I ran this on my TBI zz4 vortec'd head 350. Gears will be the remaining factor to getting it to move easier.
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  #3  
Old 01-27-2012, 01:21 PM
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Billygoat Billygoat is offline
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Join Date: Mar 16, 2004
Location: Southwest Wisconsin
Posts: 2,493
What year is your donor computer?

You can do what needs to be done to be able to tweak and update your programs for not a lot a cash and get more power out of your existing hardware. If you get PE (Power enrichment) to kick on when it should it will help you out a lot. Plus actually dial in your program for the chero instead of the donor.

You can also drop 454 injectors in your TBI - same base unit.
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  #4  
Old 01-27-2012, 01:30 PM
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Subic Jeep Subic Jeep is offline
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Thumbs up

Quote:
Originally Posted by okjeep
Don't do it. Look at the upsized unit from CFM-Tech (http://www.cfm-tech.com/). I ran this on my TBI zz4 vortec'd head 350. Gears will be the remaining factor to getting it to move easier.

Thanks for the reply!

Gears is not an option at the moment.

Is there something wrong with the Holley unit?

Yes, I have looked at the CFM-Tech products, (my first choice before I found the Holley) Adding all the parts for CMF, its as expensive as the Holly unit. Remember I would have to pay 150$ for the core.
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Lars

I am in the five bananas category!
Cherokee 1981 officially 1974 huh local irony
Gen 1 GM-SB 350 V8 TBI - TH400 - Klune V - Twin stick NP205 w. Nippon shifter
Dana 60 w. ARB locker, hydraulic assist + GM 14FF w. Detroit locker.4-link rear on LC80 19mm coils
Rancho 5036 Shocks 14 inch travel. 39.5x15.5x15 TSL
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  #5  
Old 01-27-2012, 02:05 PM
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Subic Jeep Subic Jeep is offline
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Location: Philippines
Posts: 549
Smile

Sorry far away from my Cherokee, I am at work now, for two months more, before I can pull my computer to see what chip it has. Taught I had a picture but, it does not show the label on the cover of the EMC. grrr

I am not going to have time to learn to tweak my computer, just want to see a explosion in power

The engine is a 350 years 69-79 basis the casting numbers on the block. Just overhauled it, all bearings renewed pistons and crank shaft are original.

New camshaft COMP Cams Xtreme Energy 4x4 Cam and Lifter Kits
Part Number CL12-239-3
Basic Operating RPM Range 1,300-5,600
Intake Duration at 050 inch Lift 218
Exhaust Duration at 050 inch Lift 226
Duration at 050 inch Lift 218 int./226 exh.
Advertised Intake Duration 262
Advertised Exhaust Duration 270
Advertised Duration 262 int./270 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.462 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.480 in.
Valve Lift with Factory Rocker Arm Ratio 0.462 int./0.480 exh.
Lobe Separation (degrees) 111
Grind Number CS X4 262H-11

Rocker Arm Style Roller tip 1:1.5

Product Line RHS Pro Action Small Block Chevrolet Cylinder Heads
Summit Racing Part Number RHS-12002-02
UPC 036584134909

Cylinder Head Style Assembled
Cylinder Head Material Aluminum
Cylinder Head Finish Natural
Combustion Chamber Volume (cc) 72
CNC-Machined Combustion Chamber No
Intake Runner Volume (cc) 180cc
Exhaust Runner Volume (cc) 74cc
CNC-Machined Intake Runner No
CNC-Machined Exhaust Runner No
Intake Port Shape Rectangular
Intake Port Location Standard
Exhaust Port Shape Rectangular
Exhaust Port Location Standard
Spark Plug Style Angle
Intake Valves Included Yes
Intake Valve Diameter (in) 2.020 in.
Exhaust Valves Included Yes
Exhaust Valve Diameter (in) 1.600 in.
Valve Springs Included Yes
Maximum Valve Lift (in) 0.550 in.
Outside Diameter of Outer Spring (in) 1.430 in.

Axle gearing 4.56
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Lars

I am in the five bananas category!
Cherokee 1981 officially 1974 huh local irony
Gen 1 GM-SB 350 V8 TBI - TH400 - Klune V - Twin stick NP205 w. Nippon shifter
Dana 60 w. ARB locker, hydraulic assist + GM 14FF w. Detroit locker.4-link rear on LC80 19mm coils
Rancho 5036 Shocks 14 inch travel. 39.5x15.5x15 TSL
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  #6  
Old 01-27-2012, 02:22 PM
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Subic Jeep Subic Jeep is offline
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Location: Philippines
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From Pirate

Quote:
Quote:
Originally Posted by painter66
Couple things I like about the Powerjection;

One you can get into the computer to tune it. It was just the other day my son and I were looking at it and we discovered the the engine like 13.5 instead of 14.whatever at idle. My son (the Honda guru) said to me that doesn't make sense. I just looked at him and said it sounds better doesn't it it's a big block not a Honda LOL. You can data log with this system look at whats going on and change it in very minute increments. If you have a chip burned your stuck with it. What if you change something on the engine? Hey how about this you change to a completely different engine or you sell your buggy and build another one. Put the Powerjection on and off you go. There is something said for simplicity (It's simple). Why wouldn't you want something that is completely tunable?? Why let someone else guess about the tune for your engine? Yep it will run when you get the computer back or down load thee generic tune, but is it running as good as it could?



here's why. most people cannot/do not/have no idea how to tune "correctly"
you risk not getting the most potential out of your engine, or worse.... hurting it.


http://www.pirate4x4.com/forum/showt...1#post13887071


Don't let this stop the discussion
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Lars

I am in the five bananas category!
Cherokee 1981 officially 1974 huh local irony
Gen 1 GM-SB 350 V8 TBI - TH400 - Klune V - Twin stick NP205 w. Nippon shifter
Dana 60 w. ARB locker, hydraulic assist + GM 14FF w. Detroit locker.4-link rear on LC80 19mm coils
Rancho 5036 Shocks 14 inch travel. 39.5x15.5x15 TSL
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  #7  
Old 01-27-2012, 02:52 PM
FSJ Guy FSJ Guy is offline
 
Join Date: Mar 20, 2005
Location: Colorado
Posts: 10,062
The only reason to go to different (bigger) injectors is if you are maxing out the duty cycle. According to the interweb, you're supposed to stay below 80-85% duty cycle.

You could bump up your fuel pressure for an inexpensive way to get more fuel to the engine. I'm running the regular (350) throttle body on my 401 and have plenty of power. I'm also running the 454 injectors, however.

Look into getting your own tuning hardware/software. $250 for a mail order tune is ridiculous, IMHO. For less than that, you can get all the hardware/software to do it yourself all day long.
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1987 Grand Wagoneer, slightly longer than stock.

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  #8  
Old 01-27-2012, 03:10 PM
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derf derf is offline
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Location: Littleton, CO
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Quote:
Originally Posted by Subic Jeep
Is there something wrong with the Holley unit?

It's just overpriced for what you get. Other than that, nothing really wrong with it.

There's cheaper and better ways to bump up the power. A 454 TB with a little time tuning it will give you more than that Holley can for less money.
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  #9  
Old 01-28-2012, 11:12 AM
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Subic Jeep Subic Jeep is offline
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I probably could not find a 454 TBI locally ..... anyhow just need 80lbs injectors. (Post Link???? please)

Increasing the fuel pressure is relatively easy by making the regulator adjustable.

Even a type CMF enlarging the bore is relatively easy with small grinder.

I try to post some pictures but the attachment tool just says too large, even try to re-size still to large. My photobucket account is blocked by organization

Here is a good link:
http://www.gmceast.com/technical/Swa...lidesNotes.pdf
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Lars

I am in the five bananas category!
Cherokee 1981 officially 1974 huh local irony
Gen 1 GM-SB 350 V8 TBI - TH400 - Klune V - Twin stick NP205 w. Nippon shifter
Dana 60 w. ARB locker, hydraulic assist + GM 14FF w. Detroit locker.4-link rear on LC80 19mm coils
Rancho 5036 Shocks 14 inch travel. 39.5x15.5x15 TSL
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  #10  
Old 01-28-2012, 12:57 PM
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Subic Jeep Subic Jeep is offline
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Join Date: Apr 03, 2007
Location: Philippines
Posts: 549
Waters_Howell_TBI_Installation.pdf

One more good link from same source!

http://www.gmceast.com/technical/Wat...stallation.pdf
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Lars

I am in the five bananas category!
Cherokee 1981 officially 1974 huh local irony
Gen 1 GM-SB 350 V8 TBI - TH400 - Klune V - Twin stick NP205 w. Nippon shifter
Dana 60 w. ARB locker, hydraulic assist + GM 14FF w. Detroit locker.4-link rear on LC80 19mm coils
Rancho 5036 Shocks 14 inch travel. 39.5x15.5x15 TSL
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  #11  
Old 01-28-2012, 08:23 PM
FSJ Guy FSJ Guy is offline
 
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Location: Colorado
Posts: 10,062
Quote:
Originally Posted by Subic Jeep

Overall good info. His tech is wrong on the 4 wire O2 sensor, however. Of the four wires, two are for the heater power and ground, 1 is the sensor wire and the last wire is for sensor ground.
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1987 Grand Wagoneer, slightly longer than stock.

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Don't mess with me. I once killed a living hinge.
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