Engine/Transmission (1998.5 - 2002) Best product(s) to increase spool up?

[KKlingbeil]

My truck details in my signature. Turbo is II phat shaft 62/14. I normally run with smarty on SW5 and comp off for towing and normal driving. Comp on to play. Im looking for easy ways to increase spool up. It isn't terrible, but with 3. 54 gears and towing in OD at 55-60 it can suck!



My ideas: 3 pc exhaust manifold, high flow intake manifold, cam, change to 12cm exhaust housing, etc. Looking for what you think has most helped your spool up. I am not looking to spend thousands, and am looking for good bang for the buck. Thanks!

 

[DIESELWRKS]

I just did a rebuild on the engine and now have super b special I did have the same turbo you have now before... I have a cam and 3 piece manifold. . the truck doesn't spool that bad with the turbo i have, but my biggest spooling help that I really feel is when I have the smarty on timing level 3. but I also set it on SW 9 around town set it and forget it... when I have towed with this set up I usually ran SW 3, tq 4-5 timing 1-2 duration stock, try your timing on 3 this is for bigger sticks. timing 4 is for fuel economy... . I honestly cannot say if the 3 piece helps much on spooling. I'm sure i would see more response on that and the cam If I could go back to the older size of turbo to compare... intakes will help allow your engine to breath better plus i like the sound...



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[Sticks]

Hate to say it but you are at the point where performance is nolonger cheap.

Cam and or twins.

Cam is cheap by comparison, but labor intensive.

A 1/2 twin kit to supplement your existing turbo won't be that bad, but still in the thousands, plus you will want to at least put studs in.

 

[AH64ID]

A Cam and/or a 12cm housing will probably have the biggest effects. If you tow regularly the 12cm housing is a good place to start.

 

[KKlingbeil]

Dieselwrks- I have been running the smarty on sw5, tq at 4-5, timing at 3 or 4 depending on what im doing with the comp, and duration at 2 to reduce some smoke. Tried one for duration but it really falls on its face if the turbo isn't spooled.



Sticks-If I had another turbo to my config, that isn't going to help any with spool up is it? I cant see how it would.



AH64ID- This is what I have been thinking as well, thinking I will get ahold of Industrial and see what they want for a 12cm housing. I can swap that myself. How much effect will going to the 12 have on MAX EGT having everything cranked up? Right now if I sled pull I can peg the EGT's at 1600+, but thats only for very short amount of time. In a drag race, a good 1/4 mile will probably get it to 1450-1500 egt range... As I have gotten a bit older now, 26, as compared to 20 when I first bought most of my mods, I am a little more interested in fuel mileage and towability. At 70 on the interstate, this thing is unstopable towing. 55mph is another story. 62+ isn't terrible.



So a 3pc exhaust manifold and a different intake horn really dont do too much? I would of thought there would be some noticable difference there. Maybe they aren't really worth messing with too much unless I want that last 20-50 horse? Thanks again for the replys!!

 

[AH64ID]

You will definantly run hotter on the top end with a 12cm housing, but you have to decide which one is more important, towing or racing/pulling.



A 3pc manifold and a intake horn will make a difference, but I don't think as much bang for your buck as the 12cm or cam.



If you want to spend the cash you could always do a cam and both manifolds and see how it does, then you know if you need to do a 12cm or not, and may be able to keep the 14 for racing/pulling? The cam and exh manifold will also slightly drop your EGT's.



The last thing I thought of is a manifold blanket and turbine blanket, they are said to really help spool.

 

[Harlacher]

Twins really bring the temperature down. Bring up the compression pressure also, mine blew the head gasket even after installing ARB head studs. A couple more thousand is all. Once you get started it will drain you. I have fun and can't wait until I get the head gasket changed so I can see what it will do at the quarter mile track. Hoping to be in the 13s.

 

[DIESELWRKS]

I forgot I adjusted my timing when I put the cam in to help the turbo. . this might be something to look at. mine is set to . 010" . 015" but with stock cam not sure you would want this setting

 

[cerberusiam]

You will definantly run hotter on the top end with a 12cm housing,

Maybe, maybe not. Thats the funny thing about turbos more is not always better. By downsizing the turbine housing and raising the back pressure it should increase the compressors ability to flow more. A 62 wheel on that turbo can move a lot of good air and your temps look high for what you have.



A 12cm Schweitzer housing is a good investment along with a 3 piece manifold.

 

[AH64ID]

Maybe, maybe not. Thats the funny thing about turbos more is not always better. By downsizing the turbine housing and raising the back pressure it should increase the compressors ability to flow more. A 62 wheel on that turbo can move a lot of good air and your temps look high for what you have.



A 12cm Schweitzer housing is a good investment along with a 3 piece manifold.

That's very true. If your underfueled for a 14cm it will run hotter accross the board.

 

[KKlingbeil]

I really don't think it is underfueled. It will still have a nice haze to it under full boost. I have seen as high as 56 psi when sled pulling. With comp off and smarty on 5 it doesn't get very hot at all. I'm thinking a 12cm housing and a 3pc exhaust manifold will be a good place to start.



Is there anything special done to these exhaust housing? I know they start as a S300 and then do some magic, but didn't know if it is just a standard schwitzer 12cm exhaust housing. Thanks again for the help! I would love to try some twins, but I dont have the cash flow for it at this point.