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5.3 Dyno Numbers

This is a discussion on 5.3 Dyno Numbers within the Track / Dyno forums, part of the Performance category; I decided to throw the '99 on the dyno for a couple pulls before modding it. It's a 5.3 that ...

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    5.3 Dyno Numbers


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    I decided to throw the '99 on the dyno for a couple pulls before modding it. It's a 5.3 that has a TB spacer on it from the previous owner. The rest of the truck is bone stock. Peak WHP was only 204. Is this normal for a 1999 5.3? I was expecting closer to 225. If power is off quite a bit, I'd like to get it straigthened out before modding.

    Mod plans include an intercooled turbo setup and I'm guessing I'll be forced to upgrade the trans and differential.

    Thanks for an info you can provide.

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    HAPPY JUICE itcantbestephen's Avatar
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    Re: 5.3 Dyno Numbers

    How many miles does the truck have? And you might want to take that TB spacer off. I've heard they're complete junk on Vortec engines.

    Sig by Josh

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    Re: 5.3 Dyno Numbers

    Quote Originally Posted by Matt M
    I decided to throw the '99 on the dyno for a couple pulls before modding it. It's a 5.3 that has a TB spacer on it from the previous owner. The rest of the truck is bone stock. Peak WHP was only 204. Is this normal for a 1999 5.3? I was expecting closer to 225. If power is off quite a bit, I'd like to get it straigthened out before modding.

    Mod plans include an intercooled turbo setup and I'm guessing I'll be forced to upgrade the trans and differential.

    Thanks for an info you can provide.
    That is NORMAL for the 99 5.3. The 99 couldn't outpower the stock L31 Vortec for the same year. IIRC, hypertech got 208 RWHP from their example.
    1997 G1500 Cobra Conversion, 5.7, 4L80E, 3.73 14-bolt 9.5", L31 Marine Intake, CFM TB, 02 MAF, 0411, Custom cam. Doug Thorley Tri-Ys, full exhaust soon.

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    Re: 5.3 Dyno Numbers

    Quote Originally Posted by itcantbestephen
    How many miles does the truck have? And you might want to take that TB spacer off. I've heard they're complete junk on Vortec engines.
    Thanks, I'll pull it off and try another pull. It has about 126k miles on it.

    IIRC, hypertech got 208 RWHP from their example.
    208 is exactly what I got after smoothing out the a/f at an even 13:1. It also had some KR, so I'm guessing the numbers would be a little higher with 93 octane. It seems that a thermostat would be helpful as well. Running at 200f has to be hurting power.

    Last edited by Matt M; 06-15-2008 at 09:08 AM.

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    Registered User GMC Era's Avatar
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    Re: 5.3 Dyno Numbers

    Wow, I thought my truck felt more powerful than that.
    1999 Sierra ECSB, 5.3L, 3.42 Locking Rear, True Flow Filter, Dynomax Super Turbo, Lund Genesis Tri-Fold, Bully Tailgate Lock
    www.youtube.com/watch?v=dayErrpNV2A <-------> www.youtube.com/watch?v=4RT50UUQQg0&feature=user
    Thanks ILD-->

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    Re: 5.3 Dyno Numbers

    Removing the TB spacer made no difference at all. Peak HP was 208 on both configurations, minimum HP from 45-75 mph was 155 both times, and average HP from 45-75 mph was 192 both times. Basically, the dyno graphs lie right op top of each other like a single curve. Exact peak numbers were 207.5 with the TB spacer and 207.6 without.

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    Offroad Engineerd Underpowered's Avatar
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    Re: 5.3 Dyno Numbers

    teh earliest 5.3 were the lowest. i have seen other years put down close to 240 stock before.
    new tow Rig rattles and smokes
    '89 K5 trail rig

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    Re: 5.3 Dyno Numbers

    The 99 trucks still use teh 19pph injectors on teh 5.3.. Stock hp was 270 and 315 lb/ft. Stock Vortec 350 was 255hp and 330 lb/ft with 19pph poppets.

    ANY knock retard will kill power as well.

    So you got 208 rwhp AFTER tuning??

    peace
    PAuly
    97 GMC 2wd RCSB 5.7, s10 2700 footstall, Hooker 24621hkr LT's , 2.5" cats dual 4"pipes exit B4 pass. side tire, custom driveshaft 3.42 G80 FIPK MAF descreen GM/Mercruiser Marine intake manifold 29lb LS2(EV6) injectors Ed Wright PCM(best mod), LT4 KM 14.8@94mph 2.007 4000lbs 122mph

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    Re: 5.3 Dyno Numbers

    Quote Originally Posted by Pauly
    So you got 208 rwhp AFTER tuning??
    Yes, 204 stock and 208 with the PE fueling leveled out at about 13:1. It wasn't much of a tune, just a quick fueling change. I then removed the TB spacer and it made 208 again.

    Thanks for the info on the injectors. I'm planning on running 36s or 42.5s with the turbo.

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    Registered User 96ImpSS's Avatar
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    Re: 5.3 Dyno Numbers

    I'm not surprised at those numbers.
    And even in later years (I have a 2005 1/2 ton Suburban with a pcmforless mail order tune), my opinion is that the 5.3's cannot hold a candle to the old 5.7 Vortec with simple mods. My pickup handles my 6000 lb car/trailer SOOOO much better than the Suburban handles the 4000 lb boat/trailer. Anything under 4000 rpm, there is no comparison.
    And now with the ZZ cam in the truck, there is no comparison anywhere in the rev range :)
    '98 XCSB, ZZ4 cam, Tri-Y's, Yank SS3600 TC
    PCMFORLESS.COM 87 octane tune
    14.30 @ 92.2 on motor
    13.47 @ 99.2 w/ a 50 dry shot

    '96 ImpalaSS
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    stock bottom LT1

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    Re: 5.3 Dyno Numbers

    Quote Originally Posted by 96ImpSS
    I'm not surprised at those numbers.
    And even in later years (I have a 2005 1/2 ton Suburban with a pcmforless mail order tune), my opinion is that the 5.3's cannot hold a candle to the old 5.7 Vortec with simple mods. My pickup handles my 6000 lb car/trailer SOOOO much better than the Suburban handles the 4000 lb boat/trailer. Anything under 4000 rpm, there is no comparison.
    And now with the ZZ cam in the truck, there is no comparison anywhere in the rev range :)
    I agree but hangon bc I get bashed a lot for saying I'm more impressed with my 5.7 96 vortec than I was with my 06 5.3....pulling is much better with the 5.7 IMO.

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    Astute as fek. DarkCharisma's Avatar
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    Re: 5.3 Dyno Numbers

    Can we PLEASE have a ****ing 5.3 dyno thread without the 5.7 guys coming in and beating the same dead horse?

    Mine: '04 CTS-V | Poly Everywhere | LS7 clutch | Square 245/45R18 General AS-03's
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    Registered User 96ImpSS's Avatar
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    Re: 5.3 Dyno Numbers

    Quote Originally Posted by DarkCharisma
    Can we PLEASE have a ****ing 5.3 dyno thread without the 5.7 guys coming in and beating the same dead horse?
    No
    The 5.3 really belongs in a car more than in a truck. Just like the old 327, it has its place.

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    Re: 5.3 Dyno Numbers

    Quote Originally Posted by DarkCharisma
    Can we PLEASE have a ****ing 5.3 dyno thread without the 5.7 guys coming in and beating the same dead horse?
    I don't mind. I also have a '97 with the 5.7. :)

    That reminds me. I need to sell that truck...

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    Re: 5.3 Dyno Numbers

    The 5.7 is probably better at pulling, but the 5.3 is faster and gets better gas mileage. Better gas mileage is the big part. I had a 5.7 as well albiet a 90 model it felt as strong on the bottom end but once you hit any RPMS the 5.3 takes over
    MKader17


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    Re: 5.3 Dyno Numbers

    Quote Originally Posted by Mkader17
    The 5.7 is probably better at pulling, but the 5.3 is faster and gets better gas mileage. Better gas mileage is the big part. I had a 5.7 as well albiet a 90 model it felt as strong on the bottom end but once you hit any RPMS the 5.3 takes over
    a 90 model 5.7 is WAY different than the 5.7 vortec lol.

    I had a 94 it was nothing like my 96 5.7

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    Baggin it Soon cb_silverado's Avatar
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    Re: 5.3 Dyno Numbers

    hey I got a 327:) my truck likes it lol
    -Don't worry its only A Chevy..

    - 327.030 over, KB pistons, Comp Cam, Bow-Tie Heads(Rollers,Guide Plates), Edelbrock Performer Pro-Flo EFI, Flow-tech Headers.

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    Re: 5.3 Dyno Numbers

    Quote Originally Posted by Mkader17
    The 5.7 is probably better at pulling, but the 5.3 is faster and gets better gas mileage. Better gas mileage is the big part. I had a 5.7 as well albiet a 90 model it felt as strong on the bottom end but once you hit any RPMS the 5.3 takes over
    The 5.3 is NOT faster by any mean or imagination.

    http://www.youtube.com/watch?v=cZibUXuqv4g

    You can claim that it is all day long, but a good running stock to mildly moded L31 Vortec will stomp a hole in your 5.3 anyday of the week. I bought a G1500 Express with a blown 350 Vortec (intake gaskets caused cautastrophic engine failure due to hydraulic lock) and put a wrecking yard 200K mile 305 Vortec in it to get it mobile. I put about 20K on that engine and decided it was tired but not before the conversion van ran a 16.9 @ 81 mph with stock high mile L30 (305 Vortec, 235 HP/285 TQ) underhood running on the stock L31 tune. I put a stock GM Goodwrench 350 Vortec in it and got a 16.6 @ 83 on poppets that hadn't run much in 2 years and were missfiring. I then pulled it out and changed it around a little. It has the same 350 but I put in a production LT4 camshaft, GM CSFI poppet to MFI conversion, S10 converter (stalls @ 2,600 rpm) and a drop-in K&N filter. EVERYTHING else is stock. It currently pulls its 6,000 lbs of weight to a 15.45 @ 93 mph.

    The 5.7 Vortec also tends to get better gas mileage in the real world than the 5.3 does. The 5.7 is not worked nearly as hard to get the same weight up to speed and rolling, especially around town. Case in point my Express has been getting 17 mpg on my daily commute. On the highway running 70-75 mph the fuel mileage approaches 20 mpg.
    Last edited by Fast305; 06-19-2008 at 05:51 PM.
    1997 G1500 Cobra Conversion, 5.7, 4L80E, 3.73 14-bolt 9.5", L31 Marine Intake, CFM TB, 02 MAF, 0411, Custom cam. Doug Thorley Tri-Ys, full exhaust soon.

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