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Old 02-19-2009, 10:38 PM   #1 (permalink)
CHEVYHD496
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Best Performance Upgrades for 8.1L/496

ok guys, i know some of the upgrades for the 496, but not all of them! i started this thread as kind of a mythbuster thingy. who has done what? what works, and what doesnt? im sure alot of people would be interested to know. i know for a fact, DONT REMOVE THE CATS!!
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02' Chevy 2500HD 496/Ally,EC/LB,4x4,3.73,07 tow mirrors,3" lift, 33" BFG,EFI LIVE self-tuned, AirRaid CAI,180' t-stat, .045 A/C Irridiums,MSD plug wires,Comp Cams 1.72:1 Roller-Tip rockers,Trick-Flo push rods,SW 1 7/8 LongTube Headers,Magnaflow Tru-X muffler,Magnaflow high-flow cats,dual 3" with 4" Silverline tips,Mag-Hytec diff cover and tranny pan,Detroit Trutrac Posi in rear, BBK TB back in the box-for now
New 8.1 with Raylar heads: build in progress

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Old 02-19-2009, 10:44 PM   #2 (permalink)
shep
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I try to keep up with the 8.1 mods as there is a chance one might find it's way into my 72. That being said...

Why can't you delete the cats and get a custom tune that tells the computer it's ok to not have them?
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Old 02-19-2009, 10:48 PM   #3 (permalink)
CHEVYHD496
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its possible you could. but these engines were designed to have cats. these engines aint like the old engines that werent designed to have em and GM slapped em on em anyways. And possibly the greatest upgrade for the 496, RAYLAR POWER
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02' Chevy 2500HD 496/Ally,EC/LB,4x4,3.73,07 tow mirrors,3" lift, 33" BFG,EFI LIVE self-tuned, AirRaid CAI,180' t-stat, .045 A/C Irridiums,MSD plug wires,Comp Cams 1.72:1 Roller-Tip rockers,Trick-Flo push rods,SW 1 7/8 LongTube Headers,Magnaflow Tru-X muffler,Magnaflow high-flow cats,dual 3" with 4" Silverline tips,Mag-Hytec diff cover and tranny pan,Detroit Trutrac Posi in rear, BBK TB back in the box-for now
New 8.1 with Raylar heads: build in progress

94' Chevy S10 2.2L/5spd RC/LB 2WD
71' Chevy C-10 402BBC/T400 RC/LB 2wd
72' Chevy C-20 402BBC/T400 RC/LB 2wd Cheyenne Super

Bigger Bore. Longer Stroke. Chevy Big Block
U.S. Marine Corps
0331 Infantry Heavy Machinegunner 06-14 OIF VET
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Old 02-20-2009, 09:47 AM   #4 (permalink)
GetSome8.1HD
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Quote:
Originally Posted by CHEVYHD496 View Post
i know for a fact, DONT REMOVE THE CATS!!
Pretty sure I told ya that

Look at my sig. Everything there is proven reliable and good upgrades. If ya want more than that your going to have to get FI or Raylar. these are made for working..not a race car. Although its pretty damn fast for a truck N/A.
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Old 02-20-2009, 04:41 PM   #5 (permalink)
Pokoki
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The Raylar products look nice, but I think it was Tierod who used the complete Raylar package and could not get close to the advertised engine output. Plus they are VERY EXPENSIVE

Tierod, correct me if I am wrong.

Right now, the best mod for the money for the 8.1L is a custom tune.
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Old 02-20-2009, 05:43 PM   #6 (permalink)
GetSome8.1HD
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Raylar advertises their numbers for most likely marine applications since thats mainly what they do it for. Alot difference when your talking trans from marine and Allison in terms of parasitic loss.
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Old 02-20-2009, 10:17 PM   #7 (permalink)
CHEVYHD496
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yeah the raylar stuff is expensive but i think it would still be cool to put it on. but the reason i started this thread was just to inform people, and maybe get some new opinions. like has anyone used the bbk throttle body for the 496? and what about a diff pulley system? and what is a turbulence reducer?
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02' Chevy 2500HD 496/Ally,EC/LB,4x4,3.73,07 tow mirrors,3" lift, 33" BFG,EFI LIVE self-tuned, AirRaid CAI,180' t-stat, .045 A/C Irridiums,MSD plug wires,Comp Cams 1.72:1 Roller-Tip rockers,Trick-Flo push rods,SW 1 7/8 LongTube Headers,Magnaflow Tru-X muffler,Magnaflow high-flow cats,dual 3" with 4" Silverline tips,Mag-Hytec diff cover and tranny pan,Detroit Trutrac Posi in rear, BBK TB back in the box-for now
New 8.1 with Raylar heads: build in progress

94' Chevy S10 2.2L/5spd RC/LB 2WD
71' Chevy C-10 402BBC/T400 RC/LB 2wd
72' Chevy C-20 402BBC/T400 RC/LB 2wd Cheyenne Super

Bigger Bore. Longer Stroke. Chevy Big Block
U.S. Marine Corps
0331 Infantry Heavy Machinegunner 06-14 OIF VET
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Old 02-20-2009, 11:33 PM   #8 (permalink)
GetSome8.1HD
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Both are worthless
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Old 02-20-2009, 11:38 PM   #9 (permalink)
CHEVYHD496
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you think the raylar kit is worthless?
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02' Chevy 2500HD 496/Ally,EC/LB,4x4,3.73,07 tow mirrors,3" lift, 33" BFG,EFI LIVE self-tuned, AirRaid CAI,180' t-stat, .045 A/C Irridiums,MSD plug wires,Comp Cams 1.72:1 Roller-Tip rockers,Trick-Flo push rods,SW 1 7/8 LongTube Headers,Magnaflow Tru-X muffler,Magnaflow high-flow cats,dual 3" with 4" Silverline tips,Mag-Hytec diff cover and tranny pan,Detroit Trutrac Posi in rear, BBK TB back in the box-for now
New 8.1 with Raylar heads: build in progress

94' Chevy S10 2.2L/5spd RC/LB 2WD
71' Chevy C-10 402BBC/T400 RC/LB 2wd
72' Chevy C-20 402BBC/T400 RC/LB 2wd Cheyenne Super

Bigger Bore. Longer Stroke. Chevy Big Block
U.S. Marine Corps
0331 Infantry Heavy Machinegunner 06-14 OIF VET
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Old 02-21-2009, 12:51 AM   #10 (permalink)
GetSome8.1HD
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No not the Raylar. The turbulence reducer and TB spacer. Junk. Spend it elsewhere. The actual TB is really not worth it either IMO. It still reduces to your manifold opening so theres really no point unless you bore that out also. Just buy a Raylar intake if your going that route. Not much to do to these motors without a shitload of money. Buy a Camaro
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