Smaller turbo housing bad?

[BillyKidd]

Gary-KJ6Q: Your Sig. indicates you have an early 91 which means you probably have the different head with larger injectors than a stock 93. My "PW" injectors flow less than your stock ones(according to what I have read here) So, with your pump turned up your getting almost as much boost with the larger turbo as I am with the smaller one. The only reason I didn't go to the 12cm2 is because I read where the restricted flow of that small a turbo outlet would raise the EGT"s, especially when towing. You need bigger injectors to get more fuel and more boost but the "PW" injectors aren't for you. I think the "OL BLUE" injectors might be what your looking for. Contact Big Don about these. Hope this helps!

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93,CC,4X4,LE,Auto/3. 54. Banks intercooler/exhaust,Gauges(Pyro/Boost/Tach. ),K&N,"PW" injectors, 14cm2 wastegated turbo, "timed" pump, CUMMINS CHROME engine kit,Walker "flow-thru" muffler,Emerald Grn. w/ SS running board,Grizzly Grill Guard.

 

[Big Don]

Guys,

I'll share with you some info we've learned. I think with increased fueling and a 12cm housing you will see higher EGT's empty or towing due to the large exhaust restriction from the small area of the 12 cm turbo. I feel that the 14 housing is the best all around housing for most any truck. I have also found that a truck with 4. 10 gears likes the 16 cm housing better becase at interstate speeds you are really spinning the engine fast. At these higher rpm's the engine kinda runs out of breath.

I don't think there is a cureall for everyones truck. Below are some suggestions.

5 speed 4. 10's running interstate 16 cm housing.

3. 54's 14cm housing.

Any truck running 2 lane mountain roads with slow speeds and switchbacks 14 is good.

this is why I recommend the 14 for most trucks except those wanting to run fast on interstate with 4. 10's (good reason to buy overdrive splitter).

the 12 housing is good for increased lowend torque, but..... you will run out of breathing on high rpm's. The truck will pull incredibly strong from idle as boost builds, but the high rpm performance will suffer.

As with all mods there are tradeoffs and you need to remember if you want high rpm performance the larger housing will perform good there (i. e. HX40) and if you want lowend grunt go smaller.
The best thing to do is find someone in your area who has changed their housing and compare how the trucks perform.

I have 14 cm housings on both my trucks and they perform well. We run alot of 2 lane swithbacks in the mountains and also run interstate. The 99 with 4. 10's is getting a splitter to help on interstate.


As for injectors, I like the Lucas injectors, they make power and they do create heat. I tow 12-14,000 behind my truck with no EGT problems. The truck will run 20-30 above speedlimit uphill and I never run it over 1200 degrees pre turbo. I think this is very acceptable. Would it get hotter?? Yes if You want to hold it on the floor, but (I only did this for testing purposes) if you are exceeding speedlimit by 20-30 mph's isn't this fast enough???


later
Don



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Ol' Blue "First of the first gens: 1989 D 250 Ice blue met. 5 spd 3. 54, 155,000, Banks stage III powerpack, 3. 5" straight exhaust, pump adjustments, "'Ol Blue Special" injectors.
1999 3500 4x4 Chassis cab Emerald green ISB 5 spd 4. 10 K&N Filter straight exhaust 9 ft flatbed WARN fenderflares,Let, 275hp injectors installed, boost and pyro gages, VA plug'n power and Practical Solutions boost module. Jacobs E brake. Getting ready to install Banks Power Pack TLC!!
May buy another one in 2009!!
Check us out at:
http://donstractorrepair. homestead.com

 

[Gary - K7GLD]

DON, from your post above, it would SEEM that MY truck, with its 3. 07 differential and relatively low RPM, would do best with the 14cm as I had sorta figured - but I am still sorta confused about the difference in recommended injectors as applied to my EARLY '91 Cummins - several sources seem pretty convinced I already have larger injectors that the late '91-'93 Cummins have, so not sure which choice would be best in my case with the 14cm, or if any at ALL would be needed?

What I am looking to obtain, keeping in mind my gear ratio and Banks stuff already added, is around 250-300 hp, and 550-600 ft lbs torque. Banks CLAIMS what I have NOW with their stuff should be about 225 hp and 525 torque, and comparisons on the road with new Ford PS's seems to confirm that claim...

Considering all the above, I *might* be as well off in terms of time, money and trouble, is to merely add on a propane injection system - since the only ACTUAL time I need/want the added power is when pulling in steep grades. SOOoo, it becomes a "best bang for the buck" choice...

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http://community. webshots.com/user/davison71 Early '91 250, 727 AT, 307 rear... Banks Stinger exhaust, intercooler... US Gear OD... Tweaked pump, upgraded radiator... MORE than a match for every new PS Ford encountered so far...

"Dura" WHAT? NOW I know where all those recycled beer cans go...

 

[KEENO]

Hey Guys!

I agree that the 14cm2 is an awesome housing and is the best balanced for all around use if you don't mind the price tag. I had the Banks "Big Head" actuator 14cm2 on my truck for six months and it was nice (now on the garage shelf).

With the 12cm2 I get 3 - 4 psi more boost under most situations. What this means that if you're towing, that you can add more fuel sooner (via AFC) to increase low end torque & pulling power w/o excesive smoke & zero turbo lag. The 12 makes for an incredible responsive truck in all situations.

What "Big Don" has mentioned is true, the 14 is the great all around housing and the 12cm2 does have a higher drive pressure on the top end (RPM) side causing more of a restriction near 75+ MPH. But if your towing 'Top end' performance isn't the concern, you want low end torque to move the load... The 12cm2 excels in this area w/ no EGT troubles.

Look up a posting named "KEENO vs Xanderbilt" for a comparision between the 12cm2 and the 16cm2 on the trucks that we drive daily. (notice I didn't scream use 'search')

We all drive differently and have different uses for our trucks. I don't believe there's an absolutely correct housing for our trucks but the 14cm2 is a great place to start. Choices are a great thing! (I'll stick to the 12)

How about this suggestion: A 14cm2 from Banks goes for about $450. 00 - $495. 00 brand new + shipping. The 12cm2 can be begged from our P7100 brothers from between $50. 00 - 85. 00 used. Both require shortening the mounting flange of the downpipe 1. 5" approx for installation.

Keeno's suggestion: skip the 16cm2 (savings $150. 00) and sping for a used 12cm2 for 50. 00+ bucks and modify the downpipe (or order new, extra $$) for installation. If you don't like what the 12 does for towing, call Banks w/ CC# in hand & order the 14cm2. If you don't wish to bother w/ the downpipe mod. go w/ the easy to install and relatively inexpensive 16cm2 and be done with it.

Smoke on!

Keeno

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1992 W250 5spd. 3. 54 gears, LSD, JRE enhanced VE Injector Pump, BD High Output Injectors, 12cm2 wastegated housing, 3 1/2" JRE modified Banks exhaust/Walker muffler, pyro/boost gages, K&N, South Bend Clutch, Skyjacker 2 1/2" front suspension lift & Bushwacker 'cut out' Flares to clear 315/75R/16 BFG AT KO's, Mag-Hytec, Amsoil, Rhino liner, Fully Chrominated Aluminum Aftermarket Accessory T-handle Shift Knob

 

[Gary - K7GLD]

So WHY the radical price difference between the 14cm and the 12cm?

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http://community. webshots.com/user/davison71 Early '91 250, 727 AT, 307 rear... Banks Stinger exhaust, intercooler... US Gear OD... Tweaked pump, upgraded radiator... MORE than a match for every new PS Ford encountered so far...

"Dura" WHAT? NOW I know where all those recycled beer cans go...

 

[fastmark]

The 12 cm housing comes stock on the 94-98. They get pulled off when someone wants to bomb one. They use the 14cm or so better and use 4"+ exhaust/

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Mark Faught, 92 ext cab service truck and a 84 crew cab one ton dually with a 91 cummins and NV 4500.

 

[Scot]

Hey crash, was that you that beat me out of the 93 powertrain manual on EBAY? ):

 

[drives mopars]

actually chip at blue chip said my housing
was a 14 cm not a 16
made 210 hp with a/c on at rear wheels
with pw's and 14cm housing
chip said a great combo



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1993 w350 ex cab, banks,nv 4500 in
open exaust, pw Injectors are in. Big rig flaps,tach in,. Its loud and goes ok, for a 93,Ham radio Call KK6dm
has ability to communicate any where in the world. Headliner shelf
5 antenna's 18. 6 @ 74mph
in qtr , 210 rw hp 285 hp
at flywheel.