John02SS

iTrader: (47)

I'll see if I can talk him into letting us port it and do some back to back with it before we do the camshaft. I'm sure he would be game.

LS1curious

Your camshaft specs don't jive with the manifold tunning. That why when you change to a manfiold with a different tunning band you are getting these increases.

here is a 347ci motor with a stock ls6 intake, stock 78mm TB, stock rockers ported 243 heads and just the right camshaft. Of course everyone here would kill to make this kind of power with a head cam 6speed car using mostly stock parts.

On a mustang dyno to boot to.

Things to ponder guys.

7420NW7TH

iTrader: (8)

nice gains!

John02SS

iTrader: (47)

Not sure what you mean by my cam specs are off as I haven't mentioned any cam specs. I said I would do a ported test on the motor before and cam change was done and never mentioned any specs. To each thier own I guess.

LS1curious

All of these really popular cams that I have had cross the rollers have got narrow short powerbands with really agressive peaks. The intake runners are not happy with the bulk of those camshafts.

Funny I have seen 540whp come out of the ls2 intake on my roller with a Heads and cam 6.0 usuing similar parts to the graph I posted.

The fast intake can work its just that it favors different cam profiles then the ls6 and ls2 intakes. you are comparing apples to oranges.

ExTurbo

not all applications are purely race, some of us actually have to drive these cars on the street. My cam might or the OP's cam might not be perfectly matched to the flow characteristics of the intake perfectly, but mine still drives like the day i bought it. Most people pick a cam designed to fit their goals, most of the time that doesnt include a max effort solid roller setup...A properly ported fast will pretty much always net you more power than an LS6 and LS2, especially if matched properly with the right cylinder heads.

bunk22

I'm the owner of the car John02SS posted. Thanks for the tune John. Of course, I'll certainly allow a port job when the time comes for the cam....though like you say, it would be better to do the two separately to see the before and after. I'm going to test the car in the 1/8th tomorrow night, good weather but not the best for our local, ill prepped track.


Not sure where this came from or I'm missing something. This post has nothing to do with any cams, it's a before and after, a stock FAST vs ported stock intake. It's apples to apples as far as that goes. BTW, without any tuning, the car made 407rwhp/405rwtq.

smoke20

iTrader: (2)

nice numbers after the swap John keep up the good work buddy.

GrannySShifting

iTrader: (10)

Or that dyno is funky. Ive seen it dozens of times, the Mustang units are good, if they are cal'd right. There are so many variables in their calibration that many of the newer stuff is not. I get cars in from the same exact dyno that we have, come out 20-80 hp lower on ours. Long ago as two years, recent ago as last week.

On my dyno an auto 346 car wont make more than 330-345 lbs of torque, I think one made 345 once. Since these dynos dont show the converter flash like dynojet you get a decent feel for how much torque it IS making at peak, and a given displacement will make about equal torque. On our dyno 1 rear wheel ft lb per inch is doing pretty good with the auto drivelines. So your 500/400 is probably more like 430/335 on our particular Mustang. Still very good I might say! If it made 500 in actuality it would trap 132-136 like the bigger inch stuff weve run

LS1curious

Wrong. If you look back in ls1tech history you can find numerous reports of no gains and a few rare reports of less power. The manifolds are not bad. The problem is matching the manifold and the camshaft and the cylinder head.

Each has its own application and timming profiles that work best for each application. there is no one size fits all.

LS1curious

Recalled by mustang every 1yr. The dyno is just fine.

If you are getting varied readings from other mustang dyno be suspcious of tach pickup problems. Will cuase all kinds of chaos. Not just yours but other operators as well.

that car does trap in the upper 120's. Not really at liberty to say how fast its been. Fact is thats the most stout Head and cam car I have ever seen.

I can tell you an MS4 car barely eeks out 420 on our rollers. that should be enough info for you to figure out the calibration disparity. It also peaks at 6220 with a ls6 and 6385 with a fast 90mm.

for instance our rollers tell one of our customers he has a 690whp mustang. Car goes 8.90's.

Its a pretty accurate machine.

Pm me if you want to trade graphs. I would also be willing to go over your tach input setup to see if you have an issue with RPM reporting.

That car shown is a m6 car with a 3.15 rear gear. Seems to bolster the TQ output with the higher gearings. Also has always does. I have tested that exstensivly. straigth gear changes on m6 equipeed cars. depending on the rear in use it can move TQ by 20-30 ft lbs.

Fact is if you make 400hp with a a4 car your running high 10's low 11's on our rollers. Its not a liberal machine by any strecth never has been.

this particular machine is a 1750DE thats kept up and maintained by a guy who builds dynos for the big3. this machine is so consistent we have dynoed cars 3 years apart just to recheck our baselines and been within 1.5% everytime.

Do you benchmark your dyno ? doubtful.

LS1curious

the bus drove right by you. How did you miss it. each manifold ls1 ls6 Fast favors different cam timming. they all have there strengths and weakness's. thats all I was getting at. But please take offense. it is far easier to act like a juvenille *** then it is to try to have an Honest discussion about the parts involved in the testing you did.

1997bird

iTrader: (2)

Here is my research on the subject: https://ls1tech.com/forums/showthrea...t=collins+sean

I'm glad that you have figured out how to port the LS2 manifold and match your engine combo's. Bottom line is that not everyone will support the theory about the manifolds, lets not start the debate all over again.

SuperZ

iTrader: (2)

LS2s are a bummer

LS1curious

I don't port them. Why would a guy need to ? I can atest to nothing more then flash cleanup. Again its back to the facts at hand. this test is not a good test except to validate that this parts combination prefers a FAST intake. Nothing more.

LS1curious

works better over 6400 then a fast has as far as I have seen. Depends on the application.

ExceSSive

iTrader: (13)

I have a question for you (not to be a smart ***). What cam specs does a FAST 90 prefer with a good set of heads vs an LS2 intake cam spec? Please give examples of both. If you don't want to post them in the thread you can PM me.

Thanks
Jon

ExTurbo

I have seen some cases where people home ported fast intakes and lost power, however when properly installed and or ported 99% of the time a fast is going to make power over an LS6. I'll give you your 1% though

bunk22

Hey pot, have you met kettle? I've got a stock cam with a new FAST vs a ported LS2 intake, which was the point of this thread. However, thanks captain obvious, the FAST and different cams have different strengths and weaknesses. Start your own thread if thats what you want to discuss. It's obvious I'm not the one who took offense, afterall, who's calling who a "juvenile ***" though I spelled juvenile correctly. If you can't handle it, stop your crying and go elsewhere As a matter of fact, can anyone find where I was juvenile and took offense in this quote:

Anyone? Sounds like someone is a bit insecure. Get over it and leave the thread if you're so bothered by that

1997bird

iTrader: (2)

Because they are not that good of a intake before/after porting. Read through my link that I supplied, there are some top mechanics in there telling you that you are full of it!