500 rwhp 5.3l

[1989K1500]

Originally Posted by the_husk

No it was stock, just a change to a different cam, I cant remember. I have talked to him on this issue. He is also running the current fastest stock ls shortblock right now in his fairmont. He is in the 9's with a stock 5.3 except a cam swap pure boost fed.

I think they are about done with that because they dont want to spend the money it will take in safety mods to make it legal for the times its running. At least thats what he said before when he posted on pt about it.

[RAPID]

If you want to build a truck and have it be reliable I would get recommendations for tuning shops who are firmiliar with the 5.3 engine. They will guide you through the process....

[You.Fail.Joe]

I would just use a single turbo with DDI. Should get you well over 500 at the wheels, maybe even 600 depending on lunch.

[2500ak]

Well, other than the turbo itself, the cam is the most pivotal component in the setup assuming that the supporting components are strong enough to withstand the increased strain.


With the stock cam 500rwhp isn't going to work well, if at all. The stock GenIII cams were designed with one thing in mind, emissions. 190/191 on a 114 LSA.

The low durations will make it incapable of flowing anywhere near the engines potential.

But you don't want a hotcam either. Excessive overlap will bleed off boost compression and waste precious boost, not to mention the gas that'll get scavenged out with it.

Keep the overlap in check with wide LSA. A wide lobe sep will lower mid range compression on a N/A engine but in a boosted setup there's no reason not to keep it nice and wide. S/C cams tend to go from 114 and max out at about 118.5 LSA, but with a turbo 121 - 131 LSA is sometimes preferable.

You'll need more intake duration to let the higher volume air and fuel fill the chambers, but much more importantly you need a good exhaust bias to get the burnt stuff out of there. At the very least keep it around 8 degrees, which is a good number but you can go higher within reason.

Probably a good idea to keep the the intake duration within the 22x range and the exhaust duration below the low 23x.


Really high lift won't do a lot, but it'll add stress. The lm7 heads reach peak flow at .550/.550 not much reason to go higher than that.

The CheaTR cam from tr is a good example
214/230 with a 117 LSA


Lingelfelter really leads the pack when it comes to turbocharged GenIII's


For S/C the GT2-3 is a classic
207 / 220 with a 118.5 LSA

But with a turbo, I'd be more inclined to think a grind like the GT7 would work better
208 / 230 on a 121 LSA


Make sure you remove weak spots in the engine. Upgrade the timing chain to the heavy duty one, get springs that can handle the lift and then some. All the usual weak links.

[Atomic]

Thats some good info right there....

[thebigcheez]

ohhh, gonna be smokin'

[the_husk]

Originally Posted by 2500ak

Well, other than the turbo itself, the cam is the most pivotal component in the setup assuming that the supporting components are strong enough to withstand the increased strain.


With the stock cam 500rwhp isn't going to work well, if at all. The stock GenIII cams were designed with one thing in mind, emissions. 190/191 on a 114 LSA.

The low durations will make it incapable of flowing anywhere near the engines potential.

But you don't want a hotcam either. Excessive overlap will bleed off boost compression and waste precious boost, not to mention the gas that'll get scavenged out with it.

Keep the overlap in check with wide LSA. A wide lobe sep will lower mid range compression on a N/A engine but in a boosted setup there's no reason not to keep it nice and wide. S/C cams tend to go from 114 and max out at about 118.5 LSA, but with a turbo 121 - 131 LSA is sometimes preferable.

You'll need more intake duration to let the higher volume air and fuel fill the chambers, but much more importantly you need a good exhaust bias to get the burnt stuff out of there. At the very least keep it around 8 degrees, which is a good number but you can go higher within reason.

Probably a good idea to keep the the intake duration within the 22x range and the exhaust duration below the low 23x.


Really high lift won't do a lot, but it'll add stress. The lm7 heads reach peak flow at .550/.550 not much reason to go higher than that.

The CheaTR cam from tr is a good example
214/230 with a 117 LSA


Lingelfelter really leads the pack when it comes to turbocharged GenIII's


For S/C the GT2-3 is a classic
207 / 220 with a 118.5 LSA

But with a turbo, I'd be more inclined to think a grind like the GT7 would work better
208 / 230 on a 121 LSA


Make sure you remove weak spots in the engine. Upgrade the timing chain to the heavy duty one, get springs that can handle the lift and then some. All the usual weak links.

Very goo info, but don't forget hardened pushrods.

[XLR8N]

titanium valves

[fortplainman]

If your wondering about parish's truck, here is a site that tells what its on his truck. I stumbled onto it because I was watching some 1320 vids, but not sure if it is updated to the latest stuff he has on it. Its deff not a stock motor.

http://www.diyautotune.com/cars/cust...urbo_truck.htm

Here is his fairmont as well on the site.

http://www.diyautotune.com/cars/cust...h_fairmont.htm

[91_bowtie]

Originally Posted by fortplainman

If your wondering about parish's truck, here is a site that tells what its on his truck. I stumbled onto it because I was watching some 1320 vids, but not sure if it is updated to the latest stuff he has on it. Its deff not a stock motor.

http://www.diyautotune.com/cars/cust...urbo_truck.htm

Here is his fairmont as well on the site.

http://www.diyautotune.com/cars/cust...h_fairmont.htm

we obviously weren't referring to the 408.

I think it's funny that the 2 people here saying he made 500 with a stock shortblock have actually met and talked to him several times, yet the people who only know what they read on the net, seem to disagree.

[fortplainman]

sorry, was just posting some info that was on the web, obviously you know more since you have met with him in person, my bad. Well i guess the ruling is that chevy makes a great motor to support oodles of haha!

[the_husk]

Originally Posted by 91_bowtie

we obviously weren't referring to the 408.

I think it's funny that the 2 people here saying he made 500 with a stock shortblock have actually met and talked to him several times, yet the people who only know what they read on the net, seem to disagree.

+1 to that, I have talked to him a few times on his truck.

[05ChevySilverad]

Originally Posted by fortplainman

Well i guess the ruling is that chevy makes a great motor to support oodles of haha!

You know sometimes i wonder if some of these guys on this forum know that or not. I mean bc theres some that REALLY talk these LS engines down man. Especially the beloved 5.3L but man i know the capabilities of that specific engine from experience, and there REAL POTENT platforms. You just need time and of course money.

Can you say "Underrated" lol i mean these engines are BAD underated.

[KC9NMO]

Originally Posted by You.Fail.Joe

...over 500 at the wheels, maybe even 600 depending on lunch.

I wonder what lunch has to do with it?

[Pauly]

Originally Posted by 05ChevySilverad

You know sometimes i wonder if some of these guys on this forum know that or not. I mean bc theres some that REALLY talk these LS engines down man. Especially the beloved 5.3L but man i know the capabilities of that specific engine from experience, and there REAL POTENT platforms. You just need time and of course money.

Can you say "Underrated" lol i mean these engines are BAD underated.

The 5.3's are NOT underrated whatsoever. They produce the power that they are rated at.

peace
PAuly

[1989K1500]

Originally Posted by Pauly

The 5.3's are NOT underrated whatsoever. They produce the power that they are rated at.

peace
PAuly

I think he means people dont give them enough credit, as far as durability and such.

[05ChevySilverad]

Originally Posted by 1989K1500

I think he means people dont give them enough credit, as far as durability and such.

Thank you 1989. But as far as being able to make BIG horsepower its underated also, people seem to think that the small 3.78 isnt capable of producing pretty big numbers, and there badly mistakin.

[Maniac SS]

For 500rwhp I would recommend a single turbo setup. Twins is overkill to make that much power and wont be worth the extra cost in parts and labor. Trick Performance Products makes a very nice and affordable single turbo system for these trucks.

[bordenhard]

can any of you guys tell me what else I can do to my 2000 tahoe with the 5.3 to get a few more ponies out of it... I installed the IC Procharger kit and put 42lb injectors and had it tuned, it dyno'd 323.5 to the tires, I was a little depressed that it wouldnt break the 22" tires loose in the rain at a deadstop powerbreak... possibly, shift kit? electric fans? more boost? different cam (what size), msd? headers....

[91_bowtie]

Originally Posted by bordenhard

can any of you guys tell me what else I can do to my 2000 tahoe with the 5.3 to get a few more ponies out of it... I installed the IC Procharger kit and put 42lb injectors and had it tuned, it dyno'd 323.5 to the tires, I was a little depressed that it wouldnt break the 22" tires loose in the rain at a deadstop powerbreak... possibly, shift kit? electric fans? more boost? different cam (what size), msd? headers....

wow. Who tuned it? P1? How much boost? Stock motor? Torque converter? You're definitely down on power somewhere.