y49sides

Afternoon all,
I am looking for a little help setting up my tune.
system config:
5.3LS
LS6 Intake
102mm Throttle Body
CAM - 208 intake duration@.050 216 exhaust duration @.050 .302 lobe lift for intake and exhaust 114 lobe separation 110 intake centerline
Manual Trans - SM420
No AC
front 2 O2 Sensors Only
No VATS

Idles fine but falls flat with any movement of the throttle.
Does anyone have a TUNE anywhere close to this setup that I can start with? Any recommendations?
Thank you in advance.

G Atsma

Which 5.3 is it?
And why such a huge throttle body? Stock is 78mm and it supplies more than enough air for a small cammed 5.3.

y49sides

Thank you G Atsma for replying.
5.3 motor is out of a 2005 Silverado. PCM is out of 2002 Yukon DBC.
The TB came with the intake (only reason why I'm using it).
The cam is not huge but it is quite a bit bigger than stock.

Any suggestion are very welcomed.
Thank again.

G Atsma

The only thing about a large TB is that you will reach full engine flow capacity before you hit full throttle. In this case, a good ways before full throttle

TrendSetter

not real surprised, the airflow at low throttle opening is much higher with a throttle body that big. either switch back to a stock size or you gotta start trying other things.

play with adjusting the throttle to run the iac all the way closed and all the way open and see if one or the other makes it better.
get your ve table dialed in better.

you will need to either spend a lot of time with it or pay someone else to.

y49sides

Thank you both for your comments. I certainly don't want to through a ton of money at this but If going back to a stock TB is the best thing without having to spending a ton to time tuning it, that's what I might have to do.
(hate to have to do that though)

I have a tuner coming out to my place tomorrow to plug in and program it.

Any other suggestions?

Thank again

G Atsma

A stock TB won't be that expensive and you will NOT lose any power.

y49sides

Hi all. Update. I'll be searching for a stock TB today.

On another note, 2 additional questions when tuning:
1. I have a manual 4 speed tranny (SM420) in front of a t-case - in the tuner software, there is a section for me to be able to input the gear ratios of the tranny. Question is should I input them? and if so, will that affect anything when the transfer case is engaged essentially changing the ratios significantly?
2. This vehicle is mainly off road - rock crawling (low and slow) and sand dunes (moderate and speed) - I have a dual fan setup - any recommendations to start the temp setting for each fan for this type of setup?

Any other areas to look at and update in the Tune?

Thanks again for everyone's help.

y49sides

project status:
Swapped out to a stock 2002 TB today.
Still having throttle issues.
I have attached my Tune if anyone would care to take a look and make any suggestions.

minytrker

iTrader: (13)

You changed to a 2 BAR SD OS and never filled out the VE table.

y49sides

Thank you Minytrker - Not sure how that happened. I just am trying to get this set with pretty much stock settings.
New to all this tuning stuff - How would I change it back though?
Current Configuration:
5.3LS - Started with a 2002 DBC Yukon PCM
LS6 Intake with Stock 2002 Yukon Throttle Body
CAM - 208 intake duration@.050 216 exhaust duration @.050 .302 lobe lift for intake and exhaust 114 lobe separation 110 intake centerline
Manual Trans - SM420
No AC
Front 2 O2 Sensors Only
Dual Fans
No VATS

minytrker

iTrader: (13)

You need to start with the stock file you read out. Your also going to need to either do segment swap with a manual tune to delete all the auto transmission stuff. Or have to go in and delete all the toque management and delete every transmission code.

y49sides

The problem is the guy that started the tune did an original save of the stock tune, but inadvertently saved over it. So the Tune above is all I have now. If we found a stock Yukon Tune, wouldn't we have to purchased credits again to modify that one?

minytrker

iTrader: (13)

If you dont have the stock tune then to un-do the 2 bar OS its going to cost you 2 more credits. If you start with a stock tune from another vehilce its going to cost 2 more credits.

y49sides

OK. Actually, found original tune! Only thing changed is the VATS were deleted.

Looks like the OS has 3 "Apply Code Modifications". Should I ignore all 3 or apply the 1 BAR MAF Modification?

Is it your opinion that the stock program should be able to adjust for this CAM?
CAM - 208 intake duration@.050 216 exhaust duration @.050 .302 lobe lift for intake and exhaust 114 lobe separation 110 intake centerline

Also, should i change the tune to Manual tranny? If so, should i use the gear ratio of that tranny in the tune? It is 4x4, so when i shift in to low range, it will change this gear ratio that i set. Will that affect anything?

I have attached my stock tune for review.

Really appreciate all the correspondence.

minytrker

iTrader: (13)

Do not apply any of the code modifications. Your going to have to build a tune now for your setup.

y49sides

Ok. That's want I was think as well.

Just looking to keep it as stock as possible with the CAM upgrade and a nonelectronic manual tranny.

Really need to find a tuner that completely understands the software and how to minipulate.it even if its as minor as mine tune.

Thank you again.