TBSS intake 90mm TB tuning on 2003 Silverado

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10-28-2009 | 09:23 PM

#11

Truckshop

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From: Prairieville,La

no problem. mine would only act up after it was good and hot. but it would cut off at 4500 like a switch. and fwiw my etc scaler was wrong also. it still is cause until i read this post i didn't know what to set it at. all i did was installed the car style tb and all my problems. kind of made me mad cause i wanted to use the truck style for looks. i even made a bracket to put the stock truck intake cover back on. i didn't want anything to stand out other than the 4 bolts holding the tb on.

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11-04-2009 | 09:03 PM

#12

truckmann

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Well I guess I'll be looking to try a different TB because the problem is still there.
What a pain in the ****.

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11-04-2009 | 09:47 PM

#13

BlackGMC

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From: Fort Worth - TX

Quote:

Originally Posted by KLUG'S SS

For starters have you set the ETC Area Scalar for the larger throttle body?

Actually that setting is only for idle purposes, it has no bearing on anything else....

Quote:

Originally Posted by hirdlej

Increase it by 12%. Adding 12% to 78mm = 87mm

your math is wrong... Notice the name of the setting "ETC Area Scalar"...

You were just calculating the difference in diameter...

You should be calucating the difference in area.... Which comes out to 24.4%..... OR you could just use this spreadsheet....
http://www.marcintology.com/tuning/TBresizing.xls

Are you running in SD or with MAF?

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11-04-2009 | 09:52 PM

#14

BlackGMC

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What were your Grams/cyl at WOT before and afterwards?? Sorry i don't have HPtuners, but i would be curious if you could plot them in rpm increments....

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11-04-2009 | 09:59 PM

#15

truckmann

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Actually I am running MAF only in closed loop right now. Eventually when I have time I will get the VE table tuned in and turn it back on, but the MAF is easier to tune.

Let me see if I can find the numbers for Grams/cyl and plot them out. I'm assuming you mean before and after the intake install.

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11-04-2009 | 10:20 PM

#16

BlackGMC

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Well you know you turned your truck into a ford by running MAF only, lol....

Oh and ya, i would like to see before and after...

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11-04-2009 | 10:31 PM

#17

truckmann

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Quote:

Originally Posted by BlackGMC

Well you know you turned your truck into a ford by running MAF only, lol....

Yes but only temporarily...lol

Before the TBSS intake

Code:

Labels	2500	3000	3500	4000	4500	5000	5500	6000	6500
	0.662	0.722	0.743	0.765	0.785	0.799	0.803	0.783	0.756

and after.

Code:

Labels	2500	3000	3500	4000	4500	5000	5500	6000	6500
	0.599	0.649	0.695	0.743	0.765	0.790	0.793	0.761	0.729

Last edited by truckmann; 11-04-2009 at 10:44 PM.

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11-04-2009 | 10:47 PM

#18

hirdlej

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I have some serious re-tuning to do next spring

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11-04-2009 | 11:01 PM

#19

BlackGMC

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From: Fort Worth - TX

Quote:

Originally Posted by truckmann

Yes but only temporarily...lol

Before the TBSS intake

Code:

Labels	2500	3000	3500	4000	4500	5000	5500	6000	6500
	0.662	0.722	0.743	0.765	0.785	0.799	0.803	0.783	0.756

and after.

Code:

Labels	2500	3000	3500	4000	4500	5000	5500	6000	6500
	0.599	0.649	0.695	0.743	0.765	0.790	0.793	0.761	0.729

Ok, did you make any adjustments to your HI/LO spark table or fuel spark correction tables? Also i am assuming you used CALC.CYLAIR instead of GM.DYNCYLAIR to plot those values...

Also if you used a wideband to tune both of those logs, then it looks like the intake actually hurt you... Reason being is that your air mass is lower than before, Airmass = TQ .... Your airmass plot will pretty much resemble your TQ curve...

Last edited by BlackGMC; 11-04-2009 at 11:07 PM.