whats the answer

[T.winegar]

which one- 12cm, 14 or 16.

i've heard and read many arguments on this, but no real definite answer.

the 89non/ic with automatics don't like a 12 right?, but the 16 sounds like it won't make much of a difference, so it has to be the 14cm.

and the intercooled 91,92,and93's like the smaller ones as long as they have a manual.
what is the final say...

i want more power on the low end, but don't want my top end hurt if i can help it. mileage would be nice to stay the same, or increase...

any with experience, please speak up!!

thanks

[Begle1]

With an intake and the compressor, you should have enough flow that the 12 wouldn't be a problem with an automatic. As in, you shouldn't be over 1200 degrees at 90 MPH.

Provided that you're not towing.

Advanced timing will help cruise.

With some intercooling, the little housing definitely won't be a problem.

[dpuckett]

I vote the 16 or a 58 or 60mm compressor upgrade. Your 3.07s and direct drive are real close to a 4.10 with OD. My experience with the 14 has been that it's just a hair less restrictive than the 12. I sold my 14 and got a 16.

As for low end power, what have you done in terms of tuning? What is your max EGT? You can gain a lot of torque by turning your AFC spring wheel down and turning your cone for max fuelling, and still have a livable smoke level.

I have had best luck with timing in the 1.4-1.6mm range. Any more than that, and I start to lose bottom end, and for some reason, MPG with bottom end. I ahve actually lost MPGs (it seems) by tightening up my bottom end fuelling. Now I just leave it all loose and control smoke with my foot.

Daniel

[T.winegar]

to be honest, i've been "tuned blindly. when i cracked the fulcrum lever, i just had the shop turn it up quite a bit.

lets just say it has a lot more power now, and will even more once i get this aftermarket converter on.

but, i bet the 12 wouldn't make me happy at high end speed, or at least from others' opinions it wouldn't...

[Richie O]

I had the 16 on my 89 with the 727. I now have a S300 on my 89 and put the 16 on my 93 with a 60 GDS upgrade. I figure if the 12 gets hot under high rpms then a 16 is better for me. The spool on my 93 with 6x16's is fine with the 16cm 60mm. Put enough fuel at the 16 and it spools pretty quick. That being said I am spoiled with my lil 57mm S300. Nice mid grade turbo.

[CumminsPride]

For the price and the effort required I think the stock 18 on a 60mm hybrid and a maxed pump would be great. Especially at 90MPH and loaded. All you'll add is heat, doubt you'll see much performance from the 14 especially for the cost.

[Mad Max]

well, I'll offer my thoughts. I have a HX-35/14g on the tugboat (with a LOT of fuel and PODs), and a HX-35/12g on the trail rig (with stock fuel). The tugboat will peg the 35 psi boost gauge and will hover around 1200*. It also has a full 4" exhaust and DP. I feel the 14 is the best housing for a tug boat because it spools the turbo perfectly under full load with big fuel. I need to point out that every truck is different and each setup is totally dependend on the parts bolted up to it.
A 16 will typically spool a little less and retain a little less heat, but that depends on how much fuel is dialed into the IP. The 12 cm housing on the trail rig will not go over 1100* at 26psi, and it loads the engine hard with 36" tires and 3.54 gears and a DTT converter - that truck ask a LOT of the tranny and I cannot get the heat to go over 1100*. It has stock fueling so that's why the 12 works great on that truck, but the 14 on the tug boat will spike at 1600* if I really mash it on a dyno run. But pulling 12,000 lbs uphill, with the o/d off, the tugboat will hum right along pumping 25 psi at 1200* at 40 mph - no problem.

[T.winegar]

found me a 16cm and it will be here in a week or so. i think i will be satisfied with that...

now for a new pin... denny T is the best right?