black00ssFL

iTrader: (24)

Just got back from the dyno. Had an engine blow on me back in November and finally got around to throwing another engine in the camaro. Was hoping for some more power, but I'm happy and she pulls great. I'm a firm believer in the track anyhow.

Mod list:
Freshly rebuilt LQ4 (only 50 miles on it)
stock rotating assembly
ARP rod bolts
799 heads (milled .030)
239/242 XER cam
PAC 1518 springs
LS7 lifters
LS6 intake
Stock MAF
Ported stock TB
SLP lid
42lb injectors
racetronix fuel pump
Kooks 1 7/8th headers
3" - 4" custom Y
cutout
Stock catback

Driveline:
Freshly rebuilt "stage 2" T-56
LS7 clutch
PST 3.5" driveshaft
MWC Fab'ed 9" w/ 4.11 gears
17x9.5 ZR1's

Here's the graph and vid. First pull is very first go around with cutout closed, other pull is with cutout open with final a/f and timing set. Best closed cutout pull was 374hp (not shown), that's a gain of 25hp with the cutout!!! Damn stock exhaust!!!!!



http://www.youtube.com/watch?v=bO09kU_cwPA

And....as customary on LS1tech....the "dyno excuses": 9" w/ 4.11 gears, 93 degree temps with SAE correction of 1.00 (aka no correction), and only 50 miles on shortblock.

DarkFox118

iTrader: (7)

seems like I've read cutouts can give you weird numbers as well. You might be best off with an aftermarket exhaust.

I like it quiet, but I'm gonna have to do something to mine, starting to get rust holes forming in the stock muffler.

black00ssFL

iTrader: (24)

Doubt it. Snaking down to a smaller diameter, adding more bends, and going through a muffler that will distort flow will not give me more power. Where are you reading this? Btw here's a pic of my y pipe

DarkFox118

iTrader: (7)

it dealt with backpressure. Ofc.. so far I've been 0/5 today trying to find threads i've been looking for.

at least it's friday.

I think what people were saying was that you lose either high or low end (that's so general it's pathetic..) from a lack of back pressure by running cutouts on most motors.

nice Y pipe. I thought about doing a cutout myself, but I don't know that I'd ever open it..

black00ssFL

iTrader: (24)

I can see mid range torque loss with cutouts right after the headers. But having the location of the cutout in the y-pipe like most f-bodys do, there shouldn't be a noticeable loss, if any, compared to a free flowing catback like magnaflow or mufflex. And the hp gain will be enough to warrant the slight loss in midrange torque. Remember, my cutout is usually only open when actually racing or just showing off. I keep it closed when just driving around. I could care less about tq loss in an rpm range I'm not in when racing.

AINT SKEERED

iTrader: (2)

been there done that, Cut outs win every time. More hp , more tq and more mph at the track .

black00ssFL

iTrader: (24)

12.6@116, 2.1 60', 2300DA.

not disappointed in the results due to the DA, spinning through 1st, most of second, and some of third. Slowing down shifts and peddling didn't help any with ET or mph. My camera decided not to work before I left the house, so I'm currently trying to gather vids from some friends.

black00ssFL

iTrader: (24)

And crappy cell phone vid

http://www.youtube.com/watch?v=a_HNqaULcuA

black00ssFL

iTrader: (24)

12.07@116mph last night, 1.83 60'. Borrowing a set of 16" mickey Thompson sportsman pros. Track prep was so so, still spinning pretty bad with the 1.8. DA was 1300. Could've hit 11's last night but entered into the street legal bracket racing and dialed in at 12.19. I had to run 4 hot laps and ended up winning it. Had to let off each race too or I'd break out. By the time I finished that, there was only 30 min. left before they shut down the lanes and the clutch wasn't having 5-6 hot laps and I only mustered the 12.07 run after finishing the bracket racing.

Nitroused383

iTrader: (10)

You have a fab 9" throw a set of slicks on that thing and get in the 11's. Looks to be down on some power, throw a set of dual springs in there. I doubt your PAC 1518's are shimmed properly to handle XER lobes.

black00ssFL

iTrader: (24)

You think the springs are keeping her down about 20whp? I did a little research before putting it together and didn't read anywhere that 1518's couldn't handle XER lobes and even read a few where they were recommended. Not seeing/feeling any valve float, although it seems to peak a little earlier than I would've thought and doesn't carry well past peak hp.

Money is an issue right now with wheels/tire. I'd like to buy a set of wheels for the track with tires to match instead of just buying a stock wheel and throw slicks on them.

Nitroused383

iTrader: (10)

I think you have about 30-40 rwhp between your induction setup and a set of springs. Try throwing 2 flat washer (each bolt hole) under your slp lid to shim it up as much as you can without hitting the hood. You could ditch the maf (sd tune) or get a bigger maf. A ported fast intake would wake things up pretty good I'm sure. An underdrive pulley would get you 8-10 hp and a set of springs would allow you to rev out furtherr without dropping off. Either that or shim your springs up to 150lbs on the seat, thats what I did on my last setup and it pulled to 7000 rpm.

PREDATOR-Z

If anything going to dual springs will loose power Vs single beehive. And Pac 1518 can handle XER all day long on stock valves.

black00ssFL

iTrader: (24)

Ya, there was a thread I saw when researching where you said 1518's will work with XER lobes, and that I think you've even ran that combo before on your own car.

Besides the cam not being an optimal selection, does anything seem out of ordinary with my setup? Making a good amount of power?

black00ssFL

iTrader: (24)

Went to Pony Wars at SGMP today and had a real good time. Got some new personal bests and got a little more impressed with my car. Cut some 1.6 60'ers!! The best part about that was I was still using those Mickey Thompson Sportsman Pro's. They're about 6 years old, almost completely worn out, and only 9.5" wide. I can't wait to get some 15x10/15x4's with some 11.5's out back. DA was about 1300 when I made my best runs, and there was a 15-20mph headwind that was off and on (my two 115mph runs were in the wind, and my 117mph run was during a calm moment). Best run of the day was 11.8@117. Here's a pic of my best runs. Don't mind the reaction times, as it was during their 16 car class they put me and and used a pretty girl to armdrop for us instead of using the lights (ended up taking 2nd in my class).

kinglt-1

iTrader: (26)

I think nitroused383 is mistaken the pac 1518's with the 1218's. Those 1518's are rated .650 lift and should handle an xer lobe all day setup properly. I do agree with him on the fact that there should be more left in that combo, but m6's can be tricky at the track.

ilovechevy1

iTrader: (4)

yeah man i was very impressed with seeing your car run at the pony wars..u are almost as fast as me..and my car is procharged lol...FML

black00ssFL

iTrader: (24)

Thanks. I liked your car as well. I think I'll be heading down the procharger route with this car eventually. Being an LQ4 with the dished pistons, I'm fighting a losing battle trying to run some big n/a numbers down the road. It's plenty fun for me now as it is. All I really need is a set of 317 heads and I can run some decent amount of boost. But, I gotta get out of school and make some money first

ilovechevy1

iTrader: (4)

yep 317 heads are my next step as well...after i get this 12 bolt with 3.90's put in around 3 weeks from now..i plan to turm the boost up from 6 to 10 with some smaller pulleys with those heads and hope the engine holds..there are ppl running more boost than that and makeing the bottom end survive...i just hope the P1SC can flow well enough for those goals because just to swap my P1 out for a D1 ATI charges like 1,000 bucks..ouch...oh and swap my mid tubes out for some LT's and a better Y pipe..the Y thats on mine now has a 2.5in merge and highflow mac cats. (old style not the nice flowing new ones) and i know it's holding back some

black00ssFL

iTrader: (24)

vid of my 11.8 run

http://www.youtube.com/watch?v=6rJGMmQerhw