This is to marsports

Roastin944 · 01-13-2003, 07:42 PM

Hello,

I have read all of your posts about callaway conversion, supercharging and alot of other boost discussions. I would like to know how much the J&S Safeguard system is and where you bought yours at, will it wire directly to the 86 n/a ignition? Do i need to take apart the engine to tap the knock sensor in the block? And where do i tap the knock sensor at on the block? i dont really understand how it is hooked up, do you have any information you could give me on it, thanks alot!

John

Roastin944 · 01-14-2003, 06:05 PM

bump

ae1969 · 01-14-2003, 06:16 PM

its actually marksportcts

- The J/s does not hook up directly to the ignition... you will need an external ignition system..... msd, aurora (which mark uses).
- yes you have to tap in the knock sensor (you can do it with the engine in the car but I think it would be ideal if you pulled the engine anyways if you are planning on swapping pistons)
- Mark used J/S V.0 he actually directed me to the V.1 that I have

I'll email him and let him know you have questions.......

marksportcts · marksportcts's Garage

Roastin, I bought my J&S on ebay. You can find it there or www.thepartstrader.com for a used one. Check http://www.jandssafeguard.com/safeguard.html for info if you havent and http://www.importparts.com for a new unit. The V.1 has more flexibility and control than my V.0 and John, owner of J&S can tell you which one will work for you if you get a new one. The sensor goes between the #1 and #2 cylinder under the manifold. It is not drilled, same location as the factory knock sensor would be.

Roastin944 · 01-14-2003, 08:11 PM

So you werent retarding timing as boost increased? Just when it knocked, wouldnt v1 be better and more reliable? Didnt you say you ran 15 lbs on the callaway kit Alex has? And even up to 20 lbs? Was this with the v0 or v1? What components did you have in your turbo kit on the n/a? Thanks for the info

John

944freak · 01-14-2003, 08:22 PM

Since the J&S safeguard uses a map sensor can that be taken advantage of to eliminate the AFM on the 944?

marksportcts · marksportcts's Garage

I didn't retard the timing, only with the switch on the DME. I ran it rich a bit, and had turbo rods and pistons. Boosting with non-turbo internals is dangerous as mine started to burn some oil, but not as much as it should have. When I pulled the motor apart, three pistons shared 8 crackes between the upper and second ring. Turns out that when I removed the rings, the pistons fell apart. Thoes three pistons fractured into 6 parts. If you are gonna boost with stock internals get the V.1 as it will help retard as boost rises. I got my V.0 before the V.1/V.2 were released. The map sensor for the J&S is only for retarding timing under boost. You still need the AFM for the DME.

Roastin944 · 01-15-2003, 07:37 AM

ok thanks alot, I plan on putting in forged pistons and rods. Should i use the v0 or v1 with it? How much boost did you push after you rebuilt it with turbo pistons and rods? Thanks

John

Scott R · Scott R's Garage

I cracked pistons as well, both on my NA block, and again later on the turbo block at 7 psi. Keep it around 5 to be safe, I did not start to have any problems until I went to 7.

marksportcts · marksportcts's Garage

I was running 7 with n/a internals, and there was some knocking. Didn't realize how much damage the knocking did until I pulled the motor. I would recommend you to use the V.1 since you can set the base timing retard/boost. I had it set for 15psi after turbo internals were installed. Couple of times got to 20psi. I don't think the IHI RHB6 that I had was efficient enough at 20psi. It takes twice the timing retard to stop engine knocking than to prevent it.

Roastin944 · 01-15-2003, 10:13 PM

WOW, 20 psi, sounds like you set it up very well, id like to set up my system to be reliable like that! Im thinking of running around 12 pounds off a supercharger with the turbo internals, im trying to create a close setup to what you had.......Thanks

Roastin944 · 01-15-2003, 10:14 PM

I was just wondering how your n/a tranny and clutch held up with this power?

marksportcts · marksportcts's Garage

Well, I blew my n/a tranny the fall/winter before I came across the turbo kit in the spring. I tried to rebuild it, but didn't work out. Then I found a TurboS tranny for a good price and picked it up right after turbo. I was running the centerforce n/a kit, and it held the power quite good.

Roastin944 · 01-16-2003, 11:32 AM

Yah i am expecting my clutch and tranny to go out some time, i think the clutch will be first, even though its almost brand new about 15K on it. I am planning on putting a dual friction centerforce in from nopi.com, they are $338. Thanks for the info!

John