show me your dyno charts

[cow]

I'd like to see everyone's KA-T dyno charts (particularly DOHC) if you have them. I was particularly curious as to whether anyone was able to improve the topend, which is where all KA dynos I've seen thus far have been pretty lacking. What is the weak link? Cams, manifold, exhaust, tuning?? This is the ONLY downfall I've seen as far as KA-T vs SR; that is, the torque curves.

Thanks.

[jrc90240sx]

I like the KA-t torque curve

[encasemyheart]

From what I've seen the right cam selection can make or break your power curve.

[sil80drifter]

Is anyone actually gonna post their dyno's or just say how they like them or what happens with different cams? I don't have a dyno, else I'd post one. BUT, I do have a link to one.

http://forums.freshalloy.com/u...86583

So there. Start posting yours.

sil80

[cow]

Thanks sil80.. but I already have that one. lol. And it illustrates what I am talking about; the torque starts out GREAT, then makes a nice steady decline, especially after 5.5k.

But thanks for actually helping me out. Anyone else?

Btw.. jrc, explain why you LIKE this torque curve? :\

[sil80drifter]

He probably likes it because it starts out WAY better than SR torque curve. The decline is there yes, but you will be able to pull out of corners in lower gears at lower rpms with the great low end. The KA is obviously not trying to (and shouldn't) be a balls-out high-end-power machine. But as noted in that thread, until 5.5k rpms is where the KA will be pulling away from the SR, and if the track they race on is more turns than straight lines, by the time the SR will get to start using it's high end, the next turn will present itself, and then it's KA's turn to shine again It all depends on the situation you are in or what you are looking for. To make the torque look a little different, you could get a turbo that starts spooling a little later, but produces more high end power, like a T04, with a large A/R, for example.Sorry for trying to put words into jrc's mouth. Just had to get this out of my system

sil80

[cow]

That's true. But a nice flat torque curve is always good to have. I am hoping to have a good all around car; daily driver, autox, road race and drag. Not sure if that's possible but that's the goal, lol. If nothing else I know it will at least be fun.

[KApwr]

Here's a dynograph of Chris May's S14. I don't know why you are so concerned about torque in the upper powerband because HP is much more important in that range. What are your goals? Drag, autox, roadrace? This graph looks pretty good to me. 300+rwhp from 3900 rpm to redline is more than enough and its usable power, not peaky. I think KA performance is still in its infancy and its only a matter of time until someone gets some big numbers out of it. Someone like me! :pface

dynograph

[sil80drifter]

nice

sil80

[cow]

That is great KA, thanks a lot. Do you know what all his mods were?

I know HP is important too but the way the torque curve just dives off on the KA bothers me. A flat torque curve is really best. Hence the reason why stock KA's are so slow for such a large motor; they have a very poor powerband.

[KApwr]

His motor has JE pistons, crower rods, no headwork, i think he has some custom cams(not sure), T3/T04E(60 trim), and all boost no nitrous. That's it. I think there is alot more power to be had in the head/cam combo but since there is very little development for the KA, you don't see super high HP #'s but hopefully that will change as more people start to explore the KA. The torque does dive off but not to a point where it will hurt you. Also, you want more torque lower in the powerband not up high. The powerband on the KA is very usable and I don't think the 240 is that slow. I beat alot of cars due to my torque off the line and they can't catch up. It ran a 15.9 stock. Most people's torque curve will dive also in the upperend. That won't slow you down, trust me. Once you feel a KA on boost you'll know what i'm talking about.

[d240t2]

I'd post my dyno sheet...but it is in that FA thread anyways.

Oh well, here goes...350rwhp@15psi, stock bottom end KA. They screwed up at the dyno and the only graph with a torque curve is my 347rwhp one...shown here.



Dennis

[cow]

d240, have you done any headwork or any other changes since then? Any attempts to improve the top-end? Nice dyno BTW.. what's it run? :P

[d240t2]

Only improvements have been to my credit card balances. I haven't been able to do much in the way of improvement...but I have some ideas. It should run 12s easily, if I can ever get it to the 1/4 mile track. I would have gone last week, but I was sick as a dog.

Dennis

[jrc90240sx]

Its ok, putting word in my mouth and all.

Think of it this way. you have your KA and SR, they both produce 350hp. Like that dyno chart, how the KA makes 350lbs/ft at 3.9-4.4k and drops off slowly. the SR only makes 290lbs/ft between 6-6.5k. what car is going to pull harder the whole time your foots on that pedel? Its really hard to explain. i personly feel that lbs/ft is a better mesurement of power. and there are so many factors you have to take in, vehical wieght, gearing, ect. but i personly think that for autox KAt would be better souted then an SR. but the SR might have better road going maners.

[WDRacing]

Lets not turn this into an SR-KA debate...

[I am Technoman]

His motor has JE pistons, crower rods, no headwork, i think he has some custom cams(not sure), T3/T04E(60 trim), and all boost no nitrous. That's it. I think there is alot more power to be had in the head/cam combo but since there is very little development for the KA, you don't see super high HP #'s but hopefully that will change as more people start to explore the KA. The torque does dive off but not to a point where it will hurt you. Also, you want more torque lower in the powerband not up high. The powerband on the KA is very usable and I don't think the 240 is that slow. I beat alot of cars due to my torque off the line and they can't catch up. It ran a 15.9 stock. Most people's torque curve will dive also in the upperend. That won't slow you down, trust me. Once you feel a KA on boost you'll know what i'm talking about.

Chris used 248/248 cams in that dyno.

[cow]

Are 248/248 the 91 cams??

[oi138]

no that is two exhaust cams from a 91-94 s13.From what i've heard. The whole 91 cams are better is a myth. All s13 de cams are the same.

[cow]

But the S13 are better than S14 right?And how do you fit an exhaust cam into the intake side of the head? :|

[I am Technoman]

You must repin the dowl pin or know what the hell youre doing when you "roll the teeth back" to place it in time. These cams are really cool......

[oi138]

But the S13 are better than S14 right?And how do you fit an exhaust cam into the intake side of the head? :|

Yes s13 are better. To do the exhaust on the intake side, you have to either drill the existing cam gear to the right spec. Or buy the jwt cam gears to get it to the right spec.

[MarkEmark]

S13 cams are better? Hmm....says who? All the KA24DE's, from 91-up are exactly the same, I thought...would it make sense for nissan to have "good cams" in an old model 240, and then de-tune them for a newer model S14 if they were trying to sell a "sports-coupe/car"?

[oi138]

says a LOT of people.To shed some light on the subject. s13 cams do not actually make more peak hp. On the s14 they made the powerband a little more for lowend by changing the cam profile a little.

[MarkEmark]

Okay, word of mouth doesn't make your supposition any more credible....I need hard facts if I were to believe that....I've heard the exact same thing as you have about the "power band" but I actually heard that the S13 cams were tuned to have more power up top, and the S14 cams were tuned to have more power down low....And again...someone explain to me the rationale behind detuning cams for a newer car in which technology/power should always be increasing?

[d240t2]

Ok, try looking in the FSM's then...or the dyno charts and info that hundreds of people have from their KA cam swaps. It is well known that S13 exhaust cams have more duration than S13 intake cams, which have more duration than S14 cams (S14 intake and exhaust cams' lift and duration is the same). That is why Nissan motorsports sells an S13 exhaust cam, repinned for intake cam use, to S14 owners.

I have 2 S13 exhaust cams in my S14 motor.

Dennis

[MarkEmark]

My FSM makes no distinction between S13 and S14 cams...I have PDM-Racing stage 2 S14 cams, better than both S13 AND nissan motorsports cams! I don't mean to be antagonistic, I'm just wondering why Nissan did that...!

[I am Technoman]

Mark have you dyno’ed your car?What are you making with those cams? mine gave me around 12 RWHP

[I am Technoman]

Who really can say what cam is better. I can say as for Nissan cams the 248/248 set is sweet as hell! Maybe PDM is better but I have never seen a dyno of an n/a KA with PDM cams. What are you’re cam spec?

[MarkEmark]

Technoman...I thought you had yours ground for longer duration than the stock Nissan Motorsports cams come with?PDM-Racing has them dynoed at 11whp...and I certainly believe it, it pulls really hard all the way up to redline, and I lost next to nothing for low-end torque.

According to PDM, this is the lift/duration:Stage II PDM Cams - Intake 219 duration, .379 lift, Exhaust 221 duration, .384 lift.

Anyway, it cost me $453, $50 less than Nismo cams, and I heard NISMO ones make only upper-end HP.

I'll probably dyno it after turbocharging her (kit comes this summer, already put the deposit on the kit)...luckily since the cams are a relatively mild profile, tuned for power all around, they won't be too extreme for 7 psi of intercooled boost...Don confirms this.

Marc