Johny GTO

I need help with a cam selection, and the REVERSE SPLIT CAM seems to be what i am looking for. I love trq, i am no dyno queen. I want my torque to peak as soon as possible (3k rpm's sound cool? Does to me) and stay flat across.
2006 GTO ls2
heads: I am purchasing PRC heads. Should i go LS6 stage 1-2.5 heads,or the 5.3 stage 1-2.5 heads for higher compression?
CAM: YOU DESIGN REVERSE SPLIT
intake+ TB: budget. Do u suggest LS6 or weiland? Fast is tooo expensive
headers: pacesetter or other budget long tubers (student budget), not sure of size, perhaps u can help (1 7/8th or 1 3/4th)
Cats: high flow if any, inspection doesnt matter
muffs: race bullet (basically none)

I love the flat torque curve i am seeing with the Rev Split. MY car is a DD street racer. I am not to interested in having a high RPM peak, dyno queen, highest peak numbers. my car will rarely go over 6k rpms'. i love the Low and mid range power, i am a torque man. I want my tires to catch fire the minute i touch the throttle. Power under the curve is what i want, but i dont want it to fall off at 5k like many of the torque monsters i see. So can u design something that will give the highest, flattest torque curve, that doesnt die till 6k? I would also like a beastly lope (i want it obvious, like obnoxious) that is D-drivable (doesnt stall).

Need suggestions on whether to go PRC LS6 or 5.3 stage 2.5 heads. I am guessing 5.3 since they have higher compression.
The intake and TB will say stock for now, until i can budget ones (weiland or Ls6? Fast is too much).
Long tubes will be bought with heads and Cam, which size LT's should i pick up (3/4 or 7/8?)

Johny GTO

nobody????

Unaffliated Racing

iTrader: (15)

You don't need a reverse split. You need to stick with a traditional split. Something like 224/228 .580ish lift and keep the lsa tight. The tighter it is the quicker it will peak. Trust me..I used to do this for a living..

Johny GTO

i trust you. Thing is, the reverse split cams seem to have a low rpm torque peak that stays flat. It seems most normal\traditional splits ramp up, and dont have a flat torque curve.

Sabre002

iTrader: (7)

You dont need a split to do what you want it seems here in my cam only LS1 in my RX7 how is that for a flat TQ curve.



This cam is .589/.589 236/236 112LSA

Johny GTO

that is very nice. Well done chief. You must melt the tires off.

Johny GTO

bumped

Slowhawk

iTrader: (12)

Reverse split never means more torque or flatter torque. The Cam has to be speced around the intake,heads and exhaust.I never tested with PRC heads so my thought's are useless.

Unaffliated Racing

iTrader: (15)

Exactly! Questions I asked everyday when working for the #1 valvetrain company.

AshWS6

iTrader: (5)

PRC heads dont want a "reverse split" period. You cant make an LS1 peak torque at 3k rpms, its a function of intake manifold runner length and a bunch of other stuff, but it wont peak at 3K. An LT1 might peak near that low, but its table top torque curve isnt because it makes a bunch of torque, its just that it doesnt have the LS1 intake manifold that makes a bunch more torque on top of that from 4000-4800.

You can waste a lot of power by cuttin the head off these engines to make them peak around 6K. I can do one cam that makes 390 lbs peak and peaks at 6000, or another that may be down 10 ft lbs, still 390 lbs peak within a hundred or two rpm of the other, but make 20 more up top.

Not huge duration, relatively tight LSA is what Id do for what you want.

Unaffliated Racing

iTrader: (15)

Ash is right on the money with me. No head really wants a reverse split. When is the last time you saw a head that flowed more on the exhaust than on the intake? Or even equal for that matter... That is why you always have more duration and lift on the exhaust side.

Johny GTO

then why do those cams perform so well?

camaroguy26

iTrader: (21)

Here's my dyno sheet with my Speed Inc SI007 228/222 .588 lift 113+3 LSA. I think those are the right stats anyways, the tune was a mail order and hasn't been tweaked yet which is why the curve isn't so smooth. Other mods were Fast 78mm manifold, P+P Throttle body, MSD wires, double roller chain, SLP ported oil pump, Pacesetter mid-length headers, Mac ORY, Corsa cat-back. And even though My torque did hit a few more then Sabre's did, mine isn't as flat as his, and it started down lower then his, AND peaked later then his did. Not to mention he has a few more HP then I do. (Though I don't know how different the dyno's we used were) I like my reverse split but my next cam will be traditional, there's a reason not many people are using reverse spit cams too if you think about it.

lilbuddy1587

iTrader: (1)

Reverse splits LOVE wide open exhausts. Your exhaust leaves a lot to be desired with your setup. Not only that but you were dyno'd on a MD compared to the other gentlemans DJ dyno.

OP, if you're planning to stick with your reverse split choice, make sure to have an exhaust that flows WELL. Talk to a sponser and see what they can do for you ---->

Patrick G

iTrader: (14)

The reverse splits that work only do well if their intake valve events are what the motor wants. The LS1 with long tube headers is fairly forgiving to the exhaust duration you choose. The reason why the TR230/224 makes good power is not because it's a reverse split. Rather, it's because it has the correct intake valve events.

You've been given solid advise above. The mistake most people make is to go too large on duration and too wide on LSA. A narrower (110-111LSA) with duration in the mid 220s will make serious power under the curve EVERY TIME. Either go with a single pattern 226/226 on a 110-111LSA with 2-4 degrees of advance or go with a small forward split (226/230) if you have cats or plan on running a little nitrous.

Johny GTO

alrighty. i am convinced.

thank you gentleman.

Slowhawk

iTrader: (12)

How about this? Say,run the Cams above on a 113 +2 LSA.This brings alittle flatter torque curve that gives a better torque in the higher rpm areas which help ET I've found the short LSA give a good peak torque down low but fart in the higher rpm area's which have slowed down 1/4 times. When you go to big Cams like 236+ on 346ci motors then they like a tight LSA to bring power into a ussuable rpm area.

02T/A-WS6

iTrader: (4)

Listen to Patrick G...he knows his ****. Have him spec you one....cost 25 bucks but having the right cam for your application is worth it.

And plus if your goin to be running heads, intake, and tb a reverse split cam is not goin to give you what your looking for. They make great power on cars with a good exhaust and dont have very good flow on the intake. It helps those cars by letting more air in...hence the longer duration on the intake side. Once you get heads a reverse split cam will not utilize the flow of the heads.
I believe thats how it works....somebody correct me if im wrong

camaroguy26

iTrader: (21)

Yeah I now have the same setup except with AR 1-7/8 long tubes with their Off road y-pipe. I haven't dynoed since though. I got the reverse split hearing they liked free flowing exhaust cars with poor intake flow, and at the time I had a SLP lid and stock LS1 manifold, etc. I know a traditional cam would give me better results with my setup now, but am putting my money elsewhere. I do enjoy the reverse split cam though, and was impressed with the results I got when it was dynoed. The guys running the dyno don't see many LS1's however and was thinking their dyno was whack lol.

66deuce

iTrader: (1)

what a lot of people on here don't realize is that some cams are forward split at say, .050 lift,and then reverse split at .200 lift,or higher..so what makes a cam "reverse split" then?
it's not just about having a weak intake,or free flowing exhaust..sometimes it's about getting the valve events right..there's a lot more going on than dur. at .050 lift...