98Z28CobraKiller

iTrader: (17)

I was waiting until it was close to completion in order to start the build thread. This build is really just part 2 of my original stock longblock Lq9 build. All the fabrication is in the other thread.
https://ls1tech.com/forums/forced-in...ld-w-pics.html

Here are details on what the build will consist of:

LQ9 370 ci Iron block (.030 over)
Stock Crank
Childs & Albert Forged 6.125 rods
Wiseco K392X3 Forged 25cc dish
Livernois Stage 2 Cam (232/232 .595/595 114)
AFR 225 CNC ported w/ some additional bowl work by Mamo
FAST 90 Intake
NW90 TB
Forward facing 6.0 Truck Manifolds
2.5" mandrel bent hot "Y" into T4 flange
Precision PT88 Turbo with .96 A/R T4 Exh Housing
4" Mandrel Exhaust into 4" Magnaflow bullet
24"X12"X6" Bellcore A2A Intercooler

Fueling is handled by:
80# High Imp Inj
Aeromotive BRFPR
MagnaFuel 4301 Fuel Pump
-10 feed and stock feed line as return

Engine Management:
Stock 98 PCM w/ HPTuners 2 Bar Custom OS in Speed Density

PT88 Turbo





Intercooler





Pistons

87silverbullet

iTrader: (11)

You are my motivation to put my car together. I have been watching your build from when you first put it together with the stock 6.0. Good luck with the build.

Will we see some 9's this time?

98Z28CobraKiller

iTrader: (17)

I had to have 4 valves replaced in the AFR heads and have them milled after my nitrous assisted 408 came apart. The ringland broke on the piston and really gave the quench area of the head a beating. Engine builder assured me that the small amount of pitting left in the quench area would'nt cause any problems. This was the #7 hole. I am moving it to #2 so that I can keep a close eye on it.





Shooting for 8.90's.

ChevyChad

iTrader: (50)

Nice. Your engine setup looks very similar to mine. Of course, you are turbo, and I'm procharged, but I'm definitely interested in seeing numbers from your setup- both on the dyno and on the track!

BTW, what size cc are your heads now after the milling? Just tryin to figure out your compression..

98Z28CobraKiller

iTrader: (17)

Great question and my answer is, I'm not sure. They were purchased at 65cc. Then they got cut to 63cc when they went back to AFR for the valve recall, upgraded springs, and the bowl work. This time around, they milled them as little as possible to make them perfectly flat per my request. I'm thinking 61-62cc which should put me just under 9:1.

ChevyChad

iTrader: (50)

Ah gotcha.. Yea, we have similar compression too. Mine were initially 72cc, but have been surfaced a couple times, and are now about 70. My pistons are wiseco -11cc though, which puts mine at about 9.2..

What trans are ya running?

Tony Mamo @ AFR

iTrader: (13)

Just some "battle scars" Carlos and I agree that they wont cause any issues.

Purely cosmetic assuming you deck the head clean and straight as you obviously did.

Looking forward to the numbers when its all back together!

Cheers,
Tony

GMCtrk

iTrader: (23)

how laggy is that PT88 going to be on the 370?

Also, more or less a pet peeve, there's no such thing as 6.0 manifolds. 4.8, 5.3, 6.0 manifolds are all identical. Everything externally on those motors is identical.

HUNTER02SS

iTrader: (24)

This setup is almost identical to my friends old car. His ran in the 5.80's in the 8th., unfortunatly he never ran the 1/4. Same heads, CI, and turbo, and he had a th400 as well. Not sure what you are expecting , but you should be in this range.

RS_SS69

iTrader: (31)

Looks nice, what weight are you currently at? Are you planning on anymore weight reduction? Are you going to max out the t4 with the new setup.

ninetres

iTrader: (35)

Actually there is such a thing. The 6.0 mainfolds are ones that came off of a GM 6.0 truck engine. Just cause they are available on another engine doesn't make the label 6.0 manifolds wrong.


And nice build. Should run hard. Its a lot like my set-up with a slightly bigger snail. Do it all right and you should be able to go 8s.

cablebandit

iTrader: (37)

those pits will get filled in by carbon. No worries...been there done that. Should be a good running combo....a little more compression would be nice but spool should not be a problem

98Z28CobraKiller

iTrader: (17)

Launch control comes from:
TH350 w/ RMVB and TBrake (I've been 9.33@146 on this trans with my 408 nitrous motor so its seasoned and strong)
FTI 4500 stall
LNC-002 2 step
AMS-500 Boost controller (may add CO2)

Makes me feel better. Thanks for all the help over the last few years!

I ran it on the bone stock LQ9 long block for a while. Most of that time, I had the short runner carbon fiber intake on it. It would full spool by 5K RPM which wasn't horrible as my converter was stalling to about that at full (14-15 psi) boost. At some point during the time that I was boosting it, I developed a hairline crack that almost drove me insane trying to find. I ended up glueing my FAST together and throwing it on. Dropped the full spool RPM almost a full 1K RPM. That was then with stock 317 heads and the stock LQ9 cam. I would think that with the new cam and heads, it'll be even easier to spool and make close to 200 hp more at the same 15 psi boost level.

I managed to peel off a 6.32 @ 109.5 in the 1/8 with stock everything the night that I blew it up.

I think I need a 5.70 to go 8.90. We will see.

Should be at about 3700 lbs. After I get everything working solid, I'll start seeing if I can get some weight out.

That's the plan.

I didn't want to get into a custom piston setup plus you guys wouldn't believe what I paid for these pistons and rings. I basically had to go "off-the-shelf" to get the deal. Next step up would have put me too high and I want to be able to run 93 oct for consistant 9.50's.

cablebandit

iTrader: (37)

im using off the shelf wisecos as well. I wouldnt be trying this on 93 octane...but thats just me.

98Z28CobraKiller

iTrader: (17)

9.50's on 93 oct with about an 8.8:1 SCR ? Doesn't seem difficult. I ran a bunch of 10.0's @ 14 psi with 10:1 compression stock longblock. Detonation didn't kill it. Stretched rod bolt killed it.

I'll need 116 to run the 20+ psi required for the 8.90 pass.

cablebandit

iTrader: (37)

anxious to see how thus works out.

Turbo LS1 SS

iTrader: (7)

it will be fast! hold on

LS1BLKSS

iTrader: (36)

nice... i like your builds!!!

'Trust'

iTrader: (24)

Heck yea! Should be sick man. Just curious how you're planning on controlling boost past 14.7psi with the 98 PCM limitations?

98Z28CobraKiller

iTrader: (17)

I'll have to cross that bridge here soon. I'm going to see how far I can go on 15 psi initially. Then I am going to run a 4 bar map sensor and cut the resolution in half. This isn't nearly as horrible as it sounds as the 2 bar OS from HP tuners VE table has about double the resolution available with the aftermarket EMS's. If I can't get that working solid for some reason, then I will tackle a Megasquirt II conversion.

Right about the time that I start pushing this setup hard, my friends twin 78 setup should be wrapping up and I will have to emerse myself in BS3 for his car. I'd rather not be messing with 2 new and different (to me) EMS's at the same time. My head could explode .