Gaspo's 99 trans am project

[1999Black_Z28]

if your running a stock cam I'd get the LS9 springs, cheap and should work better than the LS6. If your going aftermarket cam might as well go with some doubles.

Lingenfelter has LS9 springs for $70

[Gaspo]

So the lq9 has more compression because of he flat top piston? And I want an 02 to 06 lq4 that is all aluminum? Thinking about doing ls6 cam. With a small cam like that I don't need dual springs do I?

[DETROITMUSCLE]

all 6.0 truck motors are IRON blocks. There can be had aluminum 5.3 blocks from things like hummers but the aluminum 6.0 are LS2 and a good bit more change. LS6 cam order the LS9 springs from LPE.

[Nocooler]

If your going to boost the crap out of it - I'd skip the 6.0, everyone thinks they are worth gold.

Just buy a 5.3 and call it a day. Run a couple more pounds of boost to make up for the power difference. Use the extra cash to buy a pile of 5.3's so you have spares for when on comes apart.

[Gaspo]

What do I need to do to prep a 5.3? What kind of power and boost can i expect from a 5.3 or 6.0? Do 5.3 have the 317's?

[Nocooler]

5.3 - I'd stick a ls6 cam in it with some decent springs and let it rip.

I think they are 9.4:1 to start with so the 317's aren't necessary, and will make it a dog out of boost.

Edit - is this enough for you:
http://ls1tech.com/forums/forced-ind...sults-vid.html

[Gaspo]

5.3 - I'd stick a ls6 cam in it with some decent springs and let it rip.

I think they are 9.4:1 to start with so the 317's aren't necessary, and will make it a dog out of boost.

Edit - is this enough for you:
http://ls1tech.com/forums/forced-ind...sults-vid.html

Do I need e85 for that much boost? I'd rather have a meth kit instead.. I do plan on huron speed kit

[Nocooler]

93 and meth should work just fine, provided the tune is good.

[Gaspo]

93 and meth should work just fine, provided the tune is good.

So.. My shopping list should consist of stock 5.3 with ls6 cam , meth injection kit, 83 lb injectors so ill never need to upgrade. For a sd tune do I need a different map sensor? On my 98 z28 I needed a 2 bar. What year 5.3 should I look for? Are stock rod bolts ok? I have a walbro 255 pump. Will that be good enough?

[DETROITMUSCLE]

you will likely be fine with the stock rod bolts as you won't be turning much rpm with that combo, I would definately get some good gaskets (LS9 7 layer as great) for the heads though and recommend some head studs as well. That pump won't be good for a turbo car I would look into buying another and doing a dual in-tank setup off a hobbs switch. The injectors, you would be fine with 60s IMO, and they will give better drivability and idle down low but a lot of that is in the tune.

[Gaspo]

you will likely be fine with the stock rod bolts as you won't be turning much rpm with that combo, I would definately get some good gaskets (LS9 7 layer as great) for the heads though and recommend some head studs as well. That pump won't be good for a turbo car I would look into buying another and doing a dual in-tank setup off a hobbs switch. The injectors, you would be fine with 60s IMO, and they will give better drivability and idle down low but a lot of that is in the tune.

I can push that much power with 60s? I have a 2nd pump. How hard is it to install dual pumps? Do I need to change map sensor?

[1999Black_Z28]

I agree with everything Jeff said (no rod bolts, LS9 gaskets, arp studs, 60# injectors...actually sounds a lot like my build). If you do not already have a fuel pump than I would go with duals. If you already have a single 255 (like in my case) it will get you by for a while. I know that I will be limited by my fuel pump and I will boost / tune my car accordingly...that said, Tally TransAm from tech put down 580rwhp with a single racetronix

To answer your question on MAP sensor, yes, you will need to buy a 2 bar MAP

edit: or 3 Bar sensor if you plan to boost more than 15 lbs

[1999Black_Z28]

How hard is it to install dual pumps?

Look at the stickies on tech...there is a good one in the fuel section for DIY dual pumps

[Gaspo]

I put down 552rwhp on a single walbro. Got the same pump in here. I have a good spare one laying around if I need to install duals. With a 5.3 do I get the harness and computer for it too? My car is a 6 speed. I'm keeping that.

[c0ncEpT]

I would do dual pumps right from the get go. A single isn't going to take you much past 10 PSI safely. It only takes 1 instance where the pump gets hot and drops a few PSI to melt down that turbo motor.