here is the graph....each time hp went up. a few things to note. the car is a full bolt on car, Fast 90/90, 30# Fast injectors, 257/266, .622/.642, 113 lsa cam, PRC stage 3 heads, ASP pulley. Headers are Grotyohan 1-3/4" Long tubes, 3" into a Hooker Aerochamber. he dual cutouts are in the y pipe.
Motor has about 1000 miles on it, also with a new 9" installed at the same time. Fuel pressure is fine as the AFR is pretty dead on, and last run i believe had 28* of timing. I am throwing a code or 2, 1 being a misfire that i believe to be my drivers side o2(awaiting my extension to install new o2), and egr code, and maybe a TPS code(p0121).
im thinking theres more there with more of a break in and some more tuning(something broke so we had to quit for the night), my tire pressure was pretty damn low, weather was about 88*, ~56% humidity, and ~30.07 barometric pressure(i think)
Compression is at 11.3:1. 28* was where it peaked with the limited runs we got, i believe 29/30 it didnt like and lost a few hp top. the initial base run was at 23* of timing and we went up degree or 2 each time from there. FAST 90/90, Kooks 1-7/8", Rumbler X w/Bullets, Moser 9" w/ 4.30's
NEW numbers 494rwhp, 448rwtq SAE
i have been doing some digging/etc and have some more thoughts to add.
1. im starting to question the camshaft it "burps, pops, and sputters" down low. i've had 3 tuners look at it, and its not the tune like mentioned in that thread. i know its a big cam and it'll chop, but its not acting right in certain areas of the powerband. i have to think with similar issues with very similar cams, it just might be a design flaw.
2. Another issue is i think my heads weren't worked to give me the compression that it was supposed to have. this motor was designed around the 11.3:1 CR from the get go(hence the nitrous pistons). what makes me think this is, even after all was fixed, codes, tune, and the exhaust...its still at or sub 500rw. i went back and checked my paperwork, and it doesnt mention anything about working the 72cc heads to achieve 11.3:1. Someone locally and i have discussed all this and we seem to think my compression is around 9.6:1...which kind of explains 20-30 missing rwhp.
these heads and this cam have never been touched, the longblock came assembled, timing chain on, heads bolted down, and cam installed and degreed.
on an unrelated note, we also discovered that the moser 9" i ordered was mysteriously sent with 4.30's instead of the 4.10's i asked for. and moser pretty much doesnt care, im still dealing with that but needless to say they'll never get another penny from me with all the hassle im going through.
well after all last year of my car setting in the yard i finally have the motor in and running and took it to get tuned at the hph in bg,ky.here is the breakdown
tsp 408 shortblock
qtp 1 3/4 headers with their ory
hooker catback with cutout open on this run,only lost 6 hp,10 tq closed !
kateck stage 3 heads
comp 244/248 .612/.615 on a 110 +1
fast 90/90 deridged only
aprox 11:7 scr/8.5 dcr
m6 with an ecoskel clutch
9 " with 3.89 cogs
this graph is first and last run.
Just finishing up our latest. 99 C5. Heres the specs.
403 LS2
Eagle rotating assembly
11.5ish to 1 comp
Proprietary cam (big but not huge)
Caddy lifters
CM 5/16 pushrods
11 degree heads
FAST 90 ported in house
ported LS2 throttle body
yella terras
KOOKS 1 7/8s headers
ATI balancer
Aluminum flywheel
RAM dual disc
No EWP
3.42 gears
Stock wheels
TPIS mufflers
This was on the second pull. I know it says run 17 and up, but its a customers car that we had dynoed before, we're still on the same run file. It made 510 on the first pull. Hasnt even been broke in yet.
This vehicle is an on going experiment in cam design, as well as some other goodies.
For instance, we've come up with a combo to run yella terras on the ETP and RHS heads. With virtually PERFECT geometry. If anyone is interested gimme a pm.
Special thanks goes out to my good buddy Shane (1997bird on here) from Precision Systems, out of New Mexico.
Will update first post when I get a chance. Not sure what heads they are running (maybe ETPs or RHS)
Last edited by ExceSSive; 02-24-2008 at 12:56 AM..
Let me start this thread to remind everyone that this thread is here to help others in their builds. This is only the first cam in this motor and we will be changing in a week or two to the next cam size. We are doing this to achieve what we really want out of this motor and to grab the best of both world. Now, the best part is this also helps everyone else out there trying to understand the new L92/L76 head and intake combo. So here it is. A break down of the car first. AND No its not Flywheel power.
99 f-body.
iron 408
11.5 CR
L92 heads, touched up exhaust.
L76 intake with UMI 90mm TB.
American Racing 1 7/8th long tubes with no cats.
Corsa catback with extra magnaflow muffler in the I-pipe for sound reasons.
42lb injectors
Ford 9inch
3.5" driveshaft.
6-speed car.
Mcloud twin disc.
This should cover most of what you need.
I am going to give out cam specs today to help other understand how simple and tame this combo is.
Cam specs. 230/242 116+2 LSA .590/.578
Customers goals where simple, TQ all the time, and fun to drive. I will admit, I wanted more powerband, but thats the great thing about trial and error, so the next cam will fit the bill even more. Enjoy.
Rick
Very strong...next post is with a cam swap but same set up. Love that torque.
Last edited by ExceSSive; 02-24-2008 at 05:44 AM..
Nice to know we all think alike. Already doing that on the next one. The LSA is not changing much, but I am taking out the ground in advance. I basicly ended up with a 236/246 on a 115 for the one I just ordered.
Rick
Quote:
Originally Posted by Rick@Synergy
Well, like we said we would, we changed the camshaft. Its a very slight change, not giant, but got us what we wanted. Second times a charm.
We first started off with about 491hp and 494tq with the last cam, and now we are about 520 and 512tq. Not bad for a cam change. Enjoy.
so what is the max power we are seeing out of the ls6 intakes? on the 408's i dont have the cash for the 90/90 or now 92/92 but will have a ls6 with the intake port oppened to 80mm very carefully....
__________________
98 Mystic Teal Z28 iron 408
484/462
672/743 on da JUG
so what is the max power we are seeing out of the ls6 intakes? on the 408's i dont have the cash for the 90/90 or now 92/92 but will have a ls6 with the intake port oppened to 80mm very carefully....
nice pics of your car but i know someone that put down 502 w/ls6 intake
__________________ 99 Z28 mystic teal roller,rear qa1's spohn adj ta,adj phb,eibach pro kit,4.11's,th400,4xx stroker coming january 2010
01 tahoe 20's screens,LT's,etc...
99 trans am LT's,3"Y pipe,waiting on-cam,springs,stall,4.10's,fast intake
I NEED A FAST INTAKE PM ME IF YOU HAVE ONE FOR SALE
Max HP is coming at just shy of 5500 rpm and despite boost still climbing, the HP just gives out and flat lines. Max TQ 702.5 comes on at 4532 Rpm. I am presuming my CARB approved exhaust has reached its limits...
In any case not spinning the motor past 6500, P1SC-1 putting out 13psi.
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__________________ 2004 GTO, M6, Procharged FFHP 408 dead. New plans in work
This car belongs to Adam WS6 on here and put down some killer numbers!
The engine is an 11:1 408 built by HK Enterprises. We topped it off with some Trick Flow 235cc Cylinder Heads, a Greg Good ported FAST Intake, and a BIG Camshaft (258/262 .645/.645 112 LSA). We also replaced his 1 3/4" Kooks and Catted Y-Pipe with a 1 7/8" Kooks, Off-Road Y-Pipe, and Cutout.
Through a T56 and Stock 10-Bolt this car put down 576 RWHP & 504 FT. LBS.
The sound of this car through the cut-out is just wicked!
Another 408 that was just finished at G-Force here in Houston. Still has 10 bolt but is 4.10 gears so it might have made 580+ with stock gears.
Nice numbers Erik. Most of the motors you guys build really produce unless they have some suboptimal parts like: stock heads, LS6 intake, or a head/cam combo that is not optimized. Thanks for posting.
__________________
Arctic White SLP #7424, 17X9.5 C6 Z06 rims
Car wt. full tank 3520
Car is 01 LuminaSS A4 (Sedan GTO Here in Middel East)
6.0 LQ9 Iron Block Bored .030
Eagle Crankshaft.
Diamond Piston -10cc.
Scat Connectting Rods.
Clevite Main & Rod bearing.
TSP Ported Oil pump.
TR Trex 242/248 611 620 110lsa with all valvetrain.
PRC LS6 Stg 2.5 Heads Milled to 62cc
Compresstion is around 11:1
Stock A4.
stock rear & gears.
Sureflow headers (very small)
2.5 ORX into 2.5 Magnaflow.
Stock TB.
LS6 Intake
K & N Filter
ASP Pulley.
Stock MAF
stock water pump.
Tuned by HP Tuner.
Engine have less than 500miles.
Best numbers were 445rwhp 430rwtq SAE With 29dgrees of timing.
Sorry dont have a gragh
Here is gragh for 441hp 425tq sorry a littel blurry
__________________ 01 ZO6 - Built 346ci H/C STS TT 559rwhp 530rwtq 9psi 701rwhp 669rwtq 16psi(Old Setup)
now N/A 346ci H/C 8:5.1 compression 370rwhp but not for long
Already doing that on the next one. The LSA is not changing much, but I am taking out the ground in advance. I basicly ended up with a 236/246 on a 115 for the one I just ordered. 
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