Robinator

iTrader: (1)

I have a 99 Z28 M6 with 343 rwhp and 357rwtq tuned with only gutted cats, a cutout, and a K&N intake. Is it possible for me to hit 400 rwhp (with a tune) by putting a cam and doing the valvetrain while still using the stock LS1 manifold and stock exhaust manifold? BTW...it needs to pass CA emissions too.

Jabroni

I'd have said "yes" until I got to the part about CA emissions. I know a buddy of mine doing around 405 RWHP with a T-Rex and stock everything else so it can be done but even with a dead-on-***** tune, it's highly doubtful, IMO. Anything's possible, though.

Robinator

iTrader: (1)

yeah, CA emissions is killer but the tuning is going to be dead on. Kieth(my tuner) is phenominal(sp).

BTW...I feel bad for you with all those mods and not 400 at the wheels. Do you have gears or a rear end? That would lower your numbers.

Does anyone else have this done?

1QuickT-A

iTrader: (12)

its kinda hard to believe that your car put down 340+ without headers or an ls6 intake..

Robinator

iTrader: (1)

tell me about it. The tuner said he has only seen two other freaks like this in 6 years of tuning. The others were a WS6 that put down 341rwhp and an SLP SS that put down 354rwhp. I can beat 03-04 cobras, supercharged and built 5.0's, many other LS1's that have had gears and full exhaust systems(not LT's) and chips, etc. I have even beat a 5.0 that had all boltons and about a 75-100 shot. There are other drivers that are better than me but I am a pretty damn good driver when it comes to shifting. I have a stock hurst with a short stick and I can row with it.(not braggin but just putting that out there)

MKS

did you buy your car new?

T-maxx

chips...... hmmmm.

LSs1Power

iTrader: (5)

Getting 400rwhp without headers is going to be very very hard. The cam isnt going to pick as much gain with the stock manifolds. You will need Cam and headers to break 400rwhp. Good luck.

Robinator

iTrader: (1)

I am the second owner and its not chiped. It has the LS1 edit dyno tuned in it. There is nothing that came up on the carfax and nothing looks like it has been removed before.

MannyZ28

iTrader: (1)

Damn, you have pretty much the same numbers as me with way less money in it. Either I am on a bastard of a Dynojet, or my car was a Monday car....lol. Looks like you got a Wednesday car.

Congrats on those numbers, but I have to agree, you will have to plunk down for the intake, headers and Y pipe if you want to take full advantage of the cam. I was gonna just do a cam at first too, but everyone and their uncle talked me into doing it the right way. My cam is on order but it's not installed yet, and so far I am loving the heades and Intake.....well, I gained 34 rwhp and 36 rwtq from them.

Manny

Robinator

iTrader: (1)

good gains. can I get away with just shortys?

jrp

iTrader: (16)

PatrickG into the search button and read

d james

you can check out the post I just put up, and you will see that you can't have a really big cam and pass emissions-especially with gutted cats. Even the TR 224 is just shy of 400 rwhp, although some have hit that number, but thats with longtubes and other bolt-ons. Your numbers are really high, but your still 60 horses from your goal. How fast do you want to go in the 1/4 mile? I notice people talk about high numbers but this doesn't mean low ET's unless you can hook up all that power. Personally I think it would be embarassing to say yeah I have 400 rwhp then race a tweaked all AWD car like a wrx si and get blown away because you couldn't hook. I say screw Cali emissions and just get the longtubes, there are plenty of people who have them and still find shops to pass you. Hell I called up a few shops out there and they said they install longtubes almost everyday. They said we can't gaurantee you'll pass, but people must be cause they don't come back to get them removed. You could use shorties, but people have pulled the same numbers with ported stock manifolds-there is a company that claims 10 rwhp with their 01-02 CNC ported ones which is right on par with the shorty headers. Your best bet might be to get ported heads.

Patrick G

iTrader: (14)

Hitting 400 rwhp without ported heads is very hard when running factory manifolds and cats. The manifolds are definitely the choke point. If I were running a bigger cam, exceeding 400 rwhp would be possible, but I love the bone stock nature of the small CheaTR cam. It pulls from idle all the way to 6800 rpm! Gotta remember that the stock manifolds will not tolerate much overlap. Once you exceed 0 degrees of overlap at .050", things go downhill fast.

Robinator

iTrader: (1)

Patrick...did you have to do all of the valve train as well? (springs, retainers, pushrods, etc.)

oops i see you have heads as well. For heads and cam, 395 seems kinda low. Whats your best 1/4 mile N/A? what is it on street tires?

Patrick G

iTrader: (14)

395rwhp through totally stock exhaust manifolds, cats and Firehawk catback is not that easy to accomplish...especially when you try to do it with a cam that is soooo smoooooth, you cannot tell it's modified. I am just headers away from 425rwhp. That's how much power I'm leaving on the table. Add a bigger cam and a FAST intake, and 460 would be possible. See, it's all about compromises. I wanted to make the most power I could while still looking and sounding completely bone stock. I've made the big power before. This project has been about making power without compromises...without excuses.

Robinator

iTrader: (1)

last question is could I actually lose hp going with a standard 224/224 cam as opposed to using this cheater cam because I would be running stock manifolds? Better worded would be in the end result, is the cheater cam going to net me more hp compared to the 224/224 cam with the stock manifolds?

Patrick G

iTrader: (14)

You might make more power with the 224/224 cam than the CheaTR, but it will lope a lot harder and will not make the clean power down low or up high like the CheaTR. if you are willing to trade low speed sluggishness for more slightly power, the 224/224 cam might be worth a look. If you were running headers, then no question, the 224/224 would be better.

Robinator

iTrader: (1)

thats the only thing holding me back from the cheater is that I do want that lope sound. Im not too intrested in low end as long as it doesnt take all the way to 2000rpm to start pulling. I am more of a top end guy. The more mid and top end, the better (still have a 10 bolt rear and I am worried about breaking it).

M6HuggerSS

you will NOT hit 400rwhp with stock heads and pass smog. final.

but you may hit 360-375rwhp cam only, and pass smog...

check my sig.... i hit 400rwhp with a small cam and 10.6:1CR. and it passed smog with no problems... the FLP cats work great!

so good luck..