Cam gears, and Cams

[fast924S]

Hey guys, Im currently looking into getting a cam and a adjustable cam gear, My first question is does anyone know any companies that make a adjustable cam gear for a 924S I have only found one from Huntley Racing and they want $350 so If you guys could help it would save $$$$, Also would you recomend rebuilding the top end with some nice racing valve springs and holders, has anyone done any of this befor, The last question is whats the best cam for my Car???

Thanx guys

[SoCal Driver]

There is not much room for an adjustable cam on a 944-924 engine so don't bother.

By "room" I mean for advancing the cam without hitting the valves with the pistions. So you are not going to see much peerformance out of the investment.

Look at rechipping the DME first then improving the exhaust flow by removing the CAT.

[fast924S]

I already have done the exhaust with bursh headers a cat supstition pipe and a B&B cat back exhaust, I also opened up the intake with the Huntley Racing stage 2 cold Air kit, It elimanates the barn door type air flow meter and changes it to a HOT wire air meter, It also allows me to controle the bandwith of the injecters for the added fuel that is needed, so it wouldnt make much sense gettin a chip since I can do everything the chip does except the ignition timing. This set up is sweet and it got rid of a huge restricion in the intake. Check the kit out at www.huntleyracing.com SO anyway I figured the next step would be to run a cam but now I dont know what to do, what would you do? what do you guys think I should do. I wanna get maybe 15-20 more HP from this motor, The only other way I have been thinking about is NOS and if I do it right it would be sweet with a 50hp shot, but who knows, anyway let me know what you think.

Thanx,
Dave

[SoCal Driver]

The 944/924S models after 85 have a longer duration cam on the exhaust side. They also slightly lowered the compression. Any rpm's over 7,000 will float the valves and may cause piston to valve interference.

As I see that you have really done quite a lot I was not aware of (hint: add it to your signiture line!) I would suggest going to higher compression pistons or even getting a 3.0 Liter engine or both. Think that Anderson has a tricked out 2.8 for around $4,000.

I know this is not as easy as just swapping in a cam (you could give it a try) but most likely tearing into the engine will be the only direction left for you to go for more horses.

[fast924S]

Thanx for the help SOcal, I think Im just going to ask you things from now on. I really dont want to spend that much money and since I already rebuilt this 2.5 liter 924S motor I think I will just keep playing with it to see what it likes, I think I will try a cam, stiffer valve springs and a larger throttle body just to see what happens, But just to make sure you dont recomend a adjustable cam gear?? Also what about NOS do you know of anyone who has installed one on a 924S, I have done one ona honda so I know what to do but I was just wondering if anyone has tried it before?? Anyway Thanx agian

[Moneyguy1]

Nuthin to lose..Go to the PAECO site and get their free catalog. Parts for 944 engines include cams, head rebuild and modification, headers and a bit more.

[will944]

fast924S:

Did you notice a good gain from the Stage 2 MAF? I was thinking about putting one on my car...but wasn't sure if the added performance would be worth the money. And why is the Stage 2 kit only $8 more than Stage 1??

Where in the New Haven area are you from? I am originally from Durham CT, came here for college and have decided to stay.

Thanks

[fast924S]

Will, Im from Guilford, it next to branford and Madison, As For the stage 2 kit, I enjoy it alot. But dont expect tons of power from it, I will agree that it most likley gives you about 10- 15 more hp so I dont think there numbers lie, The best part about it is that it lets you expand for more perfomance add ons, like if you did head work just readjust the fuel controle and ur all set and it also gave me alot better throttle response, Most of the power you gain from it is felt at 4,000rpm and above, I am very pleased with it, the only down side is that it was a little time consuming to install because you have to find all the wires that you have to connect to and most of them are in the ECU wiring harness, Last I heard they upgraded the kit to a better fuel managment controler but Im not sure. Also the system is a little sensitive to large temp changes, SO if you set it up when its 80 degrees out and at night it goes to like 45 degrees you will notice that you are running a little rich but its never a problem, After all this system is the base from which my power comes from, If your gonna do it upgrade the ignition too. If you have any other questions just drop a line

[will944]

Thanks for the input. I think I may add it to my car. I plan on removing my chip and adding a fuel pressure regulator for some adjustment on that end. Would that be the best thing to do? Or keep the chip bcz it retards the timing and incraeses fuel?

What is the best kind of ignition anyway? And how much do they run?? Is it necessary or just better for adjustment if you add the MAF.

Thanks

By the way...I live on Guilford Rd (RT 77) in Durham...1.5 north of the Durham/Guilford line

[fast924S]

Will, The HR stage 2 kit comes with a adjustable fuel pressure regulater in the kit, Also the MAF sensor is way better then the old barn door type sensor that porsche used in the 944/924S motor. Also the MAF sensor opens up the air way greatly I think its like a 3" diameter where as the old way is only like a 1", they show a picture of the 2 on the HR website its a huge Difference. As for the chip I would leave it in to see what happens, Timming is one area I have no controle over at the moment, since I have no chip, So I would leave it in and test it with and with out the chip to see If you notice a Difference. Right now I am running a Jacobs Eletronics Omni Magnum ignition, it was about $280 and its really easy to install, I noticed a increase in throttle response and the engine pulled harder after I upgraded the ignition, Put it this way If you add more fuel and air you need more spark to light the mixture. Now for the hard question whats the best ignition?? I dont know, I would go with a big name like MSD or Jacobs or Mallory they all make great igntions. Its up to you to research and FInd what you think will fit your application. Anyway we should get together and check out are cars sometime and I will show you how I have the HR kit set up.

[dfrac]

I disagree with the comment made on the adjustable cam gear. I have an aftermarket cam, 88 pistons and a head that has been shaved .040". Evan with the cam advanced 4 degrees i am still within specs for piston to valve clearance and this is with a cam that opens the intake valve much sooner than the stock cam.
I have run some computer generated dyno charts and it appears that there is some HP to be gain below 5,000rpm by advancing the cam. You have to remember though that just advancing the cam will not increase HP. All it will do is move the torque curve down.
If you go with an aftermarket cam there is really no reason to go with the adjustable cam sprocket since the cam is already designed for a certain power band. The adjustable sprocket will help with the stock cam though as it was designed with retarded timing to help meet emission requirements.