Silver_TransAm

iTrader: (2)

Pictures will be posted soon




So heard a funny noise one day coming from the engine. Took it home and started looking for what was making the noise. Sounded like a ticking knocking sound coming from inside the engine. I pulled off the valve covers to see if it was a rocker or something but couldnt find anything wrong. Checked compression to see if I broke a piston but all was fine. Checked the oil drain plug and found metal shavings hanging on to the magnet. So finally decided to pull the engine due to the fact that it was more than likely the rod knocking.
Well after disassembling the engine it was in deed a spun bearing that was making the knocking sound. The engine had about 118K on it and had a rear mount turbo for about 20k and before that it was cammed. I also wasnt to easy on it but hey.



The new build consists of the following

Forged eagle H-beam rods
Forged wiseco pistons
stock crank
ported 317 heads
ls9 head gaskets
arp head bolts
arp studs in the bottom end
victor jr intake with 90mm tb

other specs I already have on car

60lb injectors
dual walbro intake pumps
fpr on aluminum fuel rails with return fuel system
4l80e trans with shift kit and upgraded clutches
beefed up 10bolt (well as far as u can)






Also decided to put the turbo up front as well. Stood the stock radiator up and dropped it a couple inches to clear hood. Used the same 76mm turbonetics turbo tial waste gate with factory ls1 manifolds with a 3 inch dp all the way out into duals with no muffler.










So the question I have is what kind of boost can I run with my new setup engine wise since I know the 10bolt wont last long? Also what should the timing be at before it hits boost and once in boost with 93oct gas? Also what kind of power should I be making and 15psi?


Any feedback welcomed.

BlkBird2000

iTrader: (10)

Run that bitch at 15 psi.

yelo04goat

iTrader: (11)

Let her eat!!!!

Silver_TransAm

iTrader: (2)

I wanna run 17psi on the high end. question is will I push water at 17psi with stock style heads and the ls9 gaskets with arp head bolts?

Also compression is 9.3 to 1

TurboAv

iTrader: (6)

Depends on the tune and luck.

yelo04goat

iTrader: (11)

lots of people run 20-22 with out a problem others push water at 15...

TurboAv

iTrader: (6)

Some of it depends on what form of FI you use. A Procharger builds boost as rpms increase. Although some folks now are using a wastegate on the charge pipe of a centri blower. A turbo can be at full boost at 4000rpm on up. A good tune is key though.

Silver_TransAm

iTrader: (2)

So I take it its all in the tune whether or not I will push water?

What kind of power estimate should I be expecting at 15psi?

TurboAv

iTrader: (6)

I seem to remember a thumb rule that in an ideal situation 1bar(14.7psi) will double your NA power output. You also have a 4L80E, so don't get to wrapped up in dyno numbers. Run it at the track.

KnightmareLS1

iTrader: (12)

Damn, it lives!!!! Been forever since you posted up on here.Is this Matt or his bro? Turn that bitch uo tp 17 lbs and let it eat

Silver_TransAm

iTrader: (2)

Its me, my brother is in Kuwait still. Lol yeah its alive and well and front mounted like it should! It has been a year or longer since I posted I suppose. Its running pretty well and is going in for a retune this tuesday. Boost hits almost instantly and I can be at 10psi at 60% throttle pretty easy which is way better than waiting till 4500rpms to get in boost on the sts style setup. It was quite a bit of fun building the engine and turbo kit ourselves and really not all that complicated just took some time only being able to work on it a day or two a week on it. Now It just needs a rear end like yours and it would be a true beast lol.

So what you going to end up doing on yours after all?

98Camarod

iTrader: (43)

Is that a 346 still or did you get a different motor? With that compression you will be able to run more timing, which that alone can get you quite a bit of power. I'd get your tune spot on with lower boost and the relatively higher timing and slowly crank it up from there. I'd stop at around 15 if it was me.

98Z28CobraKiller

iTrader: (17)

You'll be out of injector before you have to worry about pushing water. I bet it would hold 20 psi with proper fueling and a good tune.

ttranssam

iTrader: (10)

was it built out of mild steel if so thats awsome you only see stainless..

Silver_TransAm

iTrader: (2)

Good to hear! I thought the same thing but people said I was too optimistic.

Silver_TransAm

iTrader: (2)

Yeah it was out of mild steel. Cheap and easy and should last for awhile.

Edit: Ordered piping in stainless, thought I ordered steel but changed mind last minute.

CraZee ZO6

4 bolt heads limited to 16lbs.. after that you will push water just a matter of how much and detonationnnnnnnnnnn the killer. Id keep itat 15.

6 bolt heads should be good for at least 20 25lbs...probably more but thats already to much power for 2 wheels to drive hahha