STAR

iTrader: (1)

It seems like the XFI lobes are making some good power and not too hard on the valvetrain. I like the EPP blower cam 232/240 which I beleive is on XER lobes. The application will be a 402ci, AFR 225 heads with a centri and manual trans. Its not a daily driver, but will see the track about 2-3 times a year! I want some lope, but the cam has to be very streetable. I'm thinking something like this:

230/242 .612/.612 115+4

What do you think? Too big?

Jimmy P

iTrader: (177)

I personally think both of them are too small for a 402. I had the EPP stage 1 blower cam on my 402 and the power would peak real early. I have since gotten a custom cam, which should peak a lot higher.

STAR

iTrader: (1)

I would hope for peak hp to come in at around 6300 rpms. I think that's more a function of the intake and blower than the cam. I've seen big numbers out of little cams, always best to error on the small side is what I've been told!

Rapin'Ya

iTrader: (1)

Ask a girl that same question..You'll get you a totally different answer.

Jimmy P

iTrader: (177)

Mine was peaking somewhere around 5700rpm's. This was with a GMPP carb style manifold, which flows quite well.

EPP

iTrader: (22)

CTS-V LS2/402 with stock AFR 225 heads, LS2 intake, stock 90mm throttle body, Kooks 1-7/8 headers with EPP 232/240 595/608 on 115 LSA
ATI ProCharger F-1A






402 iron block with 225 AFR heads, Victor JR intake, NW 90mm throttle body. EPP 232/240 595/608 on 115 LSA ATI ProCharger F-1A
With just warm temperature water in the air to water intercooler, and 17 degrees of timing, we got 834 rwhp. Not bad for an automatic with a high stall converter on slicks!








Kevin Polchan's F1A running in his Trans-Am

ATI ProCharger F1A video/sound clip

http://video.ls1tech.com/video/ceae3...3801157387.htm

Special thanks to Kevin Polchan for posting this video. Kevin just installed our blower cam in his engine, which you can also hear in this video.

http://video.ls1tech.com/video/70570...340150846f.htm

Dragstrip video of Kevin's Trans-Am with D-1SC installed, instead of current F-1A. Kevin has run a best of 9.17 in the 1/4 mile with the D-1SC. The F1A/epp cam combo will see better times as soon as we get some cooler weather.

http://video.ls1tech.com/video/b8b70...3a0019f4d4.htm

Dragstrip video of Kevin's Trans-Am with F1A installed, and our EPP blower camshaft.

" Little warm out, 87+ degrees, but decided to go make a few passes and try out the F1A with the new cam. I am running a 7.25/4.25 pulley and I'm seeing around 15psi @ 7000rpm. Little lower then I expected but it was pretty hot and the track is 1200' above sea level.

I'm very pleased with how the car ran, almost put the car into the wall on one pass, just would cut the tires loose about 100' out - did it twice. It never really dead hooked but last pass was a 1.28 60 foot and ran a 5.86 @ 117.5. This track is very stingy on mph, doesnt sound that great until you figure it was 85 degrees out, DA was 29-3300' and with an A2A IC the car really drops off when its hot. So I am VERY happy with how its running right now, if I could get to 60 degree 500' or less track I would bet money it will run an 8 something the way it sits. I am barely even turning this F1A (10K under max impeller), had to put the 2 step to 3000rpm just to see 2psi but it hits pretty hard after 4500 rpm.

Vid of all 6 passes, all 6 were made within 1.5 hours. Had to throw a burnout in there, you can definately hear the blower now."

Kevin Polchan

New Best from Kevin.

http://video.ls1tech.com/video/bf0de...49002a34c6.htm

"It was pretty warm (85) but decided to make a few passes with the F1A and 4" pulley. Saw around 18psi at 7000rpm. Couldnt get the car to hook no matter what, finally just put the 2-step down to 2000 rpm and went with it. Still never got a good solid hook the whole night, best 60 foot was 1.345 which is pretty terrible for this car. I'm going to have to wait for some better weather for an 8 second pass unless I do meth or an A2W IC which I dont want to do. The hot weather really kills my 60 foots, never left the starting line under 100* which kills of my 60 foot times pretty bad. Its about as tapped out as it can get, IATs are hittin 160 or so degrees. Good news is it didnt push any water but its really not making that great of power in the heat either.

Best pass was the last, 9.11 @ 148.9 with a 1.348 60 foot, finaly hit 120mph in the 1/8 on that pass.

Videos here, dont know when they will work, few passes were aborted since it would break the tires loose and head towards the wall."

" Car was 3360lbs, DA wa 1665 feet according to NWS, 2450' according to the TAG, 14.5psi of air cold in 10.25x28s ET drags, front shocks on 3, 2 step set at 2200rpm (2psi). Engine coolent temp was 180.5 before I let go of the trans brake, 183.3 when I let off at the end of the 1/4. Engine RPM was 7100rpm at the stripe, driveshaft rpm was 6460rpm, thats aroound 91% efficency on the converter.

Was using the F1A, 74K max impeller with a 7.25/4 pulley which is 69.5K. Peak boost was 18.1psi @ 7150rpm, boost was 15.5psi @ 6250rpm after the 1-2 shift, 16.1psi at 6338rpm after the 2-3 shift. IAT was 100.5 degrees when I let go of the brake and 159.9* when I let off, ambient air temp was 74, track temp at the starting line was 81.

1-2 shift at 7000rpm, 2-3 shift at 7000rpm. I was using 5 gallons of C16 + 4 gallons of 112 sunoco supreme. Was going to run straight c16 but I needed the extra weight in the rear so I pured the sunoco in. Didnt appear to push any water, level in the radiator never dropped. Timing was 22 degrees ramped down to 15.5, timer set to pull 1 degree 8 seconds into the pass, 14.5 degrees through the lights. "

9/16/05

Another new best! 9.02 in the 1/4

"Didn't make it, weather was decent but I didn't get a chance to mount up my new tires and these are 6 months old. Did make quite a few 9dohs @ 150+ but I had to turn the 2 step down to 2600 to make a clean pass, did have it up at 3500 for a couple but it was spinning the tires with the front in the air and it was just too squirrly to ride out. Best 60' was a 1.269 but I had to let off at 100' a few times. So I turned the 2 step back down, best pass was a 1.337 60 foot, 5.77 @ 121.5 1/8 and 9.02 @ 150.6.

Made 8 passes, 9.23@149 (spun), 9.27 @133 (let off), 9.09 @ 150, 12.28 and 13 something (wall), 9.05 @ 150, 9.02 @ 150, 9.05 @ 150.77 (best mph).

Max boost was 18.5 psi, no excuses, just didn't enough snot to get it done. Didn't touch the tune, was only running 14-15 degrees of timing. Didn't push a drop of water, I could have leaned on it a little more but I was happy for what it was running in the weather (about 800' DA or so). New set of tires and another cool day and it will be there. Plus I really should get some weight off this thing, I just hate to give up my power steering and brakes. Hard to be pissed considering I built the car to run 10.0/9.90. Got to use a chute a couple times to try it out, ran 150+ on every good pass, was a nice day and drove it in the trailer with almost an empty tank of gas - can't beat that.

http://lsx.streetfire.net/video/325d...ab0023a918.htm

BLNLS1/RX7

iTrader: (2)

amen.

STAR

iTrader: (1)

Care to share your new specs?

ls1290

iTrader: (20)

Personally, I think the cams that are in the 230s intake and the low 240s exhaust are perfect for a 40x sized motor.

Jimmy P

iTrader: (177)

It was specked for my 402 by Slowhawk.. It is around a 242/248, lift in the low 600's. It should make power all the way to 7000 rpm's.

Slowhawk

iTrader: (12)

The smaller 232/240 Cam is very populer and we use close specs alot on street cars.A NA 402/408ci will peak hp at 5800rpm and have good torque down low,this equates to good FI power down low but as you see above the torque drops hard up top.Not the best for a good stalled,mostly track car unless you shift at 6200rpm.A bigger Cam that pulls the torque longer and raises the hp peak higher up the rpm area can definitely help a track car.