hmmm, here I thought you had an 84 engine and I was not aware that the 3.2 had detonation monitoring.

So I guess you don'' have a wide band AFR display running now, maybe as a "just in case something has changed since the last dial-in" protocol?

Do you have any data on the temperature delta before and after the intercooler at a given ambient?

How about pressure drop data, before and after the intercooler?

Hey guys, what king of supercharges you are using and what if the model? I want to make my car suoercharger, but I dont know what is the exactly model I need.

I also thought that an 84 engine had no det sensor (too loud mechanicals) but the shop told me there was one. I will see if I can hunt up other data you requested. I don't have it on hand, will have to speak to the shop guys.

Nitrometano, do yourself a favor and go turbo. Superchargers are way too expensive and complicated to get to run well. Take it from one who knows.

Best regards,

I will take note...thanks Gerry

ivallt:

Who did the install on the J&S?

Sustained long pulls heat soak the system, which can lead to pre-ignition. Pre-ignition means that the charge ignited without benefit of the spark, actually, before the spark plug fires.

Retarding the timing will not stop pre-ignition.

The J&S unit listens for detonation, which occurs around TDC.

The J&S system was installed by the previous owner somewhere out of TN. Air Cooled Classics??? It was probably done by the gentlemen who posted a few pages back about having a couple customers who were dissatisfied with there supercharger from Superchargers of Knocksville(SOK).

The top end of the engine is being rebuit right now by Dick Elvrude, with turbo pistons, correct spark plugs that dont run too hot, and possibly an Innovative Motorsports wideband AFR. I just need to figure out if my mechanic will need to retune the J&S system?

What do you think i can do to avoid pre-ignition as you put it? I am guessing the spark plug change from W6 to W3 like i am doing?
It should be done by this next month....

Pre-ignition can be related to a hot spot in the combustion chamber, timing, too hot of a spark plug range, low octane fuel, too lean an air/fuel mixture.

You could monitor one culprit, the "lean", with a real time wide band AFR sensor and meter in the cockpit.

And, you could monitor the temperature with something like a temp sensor under the spark plug (where the sealing washer is) and a real time display in the cockpit.

I would think that if ignition knock is a high potential problem then the investment in the J&S or like system is worth its weight.

kuehl,
Like i said, I will be installing Innovate Motorsports wideband AFR, and i currently have the J&S installed. I just need to know if the J&S needs to be calibrated again now the the engine is torn down and rebuilt.
Thanks
Tauran
Portland, OR

I have the IM WBAFR and it works fine, however the cable could have been longer.

"Recalibrate the J&S"? Do you mean as in throwing the pumpy (your car) on a dyno and using one of J&S's Dyno Timing Controls,
in an attempt to see how well it stands up against the display on your J&S unit? Or do you mean you want to set up the J&S unit as they advise in the instructions, such as setting it at midrange and adjusting it just till the knock goes away?

Why don't you give them a call, think their in Garden Grove, CA, nice people to chat with.

By the way, where exactly is the knock sensor mounted now?
(don't say on the parts bench)

Recalibrate anyway needed. Probably the second of what you mentioned by setting midrange and adjusting...

Yes as of now J&S is on bench and i have yet to purchase the wideband IM AFR. Tempted to get the DL-32 full full data logging (map, vacuum, boost, accelerometer, ignition timing, SD card.... i could go on forever) and XD-16 16-in-one digital gauge. Maybe save money with the LC-1 stand alone controller cable.

Maybe "John at J&S" will respond before i have to call.

I have no clue where the knock sensor is mounted or will be again until the engine is together.

I would look at the sensors this way.
A) A need to know what is happening for tweaks. Once you set up the tweaks you need to consider if you really need that particular sensor any longer.
B) A need to know what is happening real-time 24/7, such
AFR, cylinder head or exhaust gas temps.

Maybe you can borrow or rent a particular sensor or set
for those areas where you will only tweak once.

Engine is finally together....running ok, idle needs adjusting and flat spots in 3rd. 200 miles down and another 800 before i get dyno and chip remapped.

911Velocity - what did you end up doing for an intercooler. Right now i have the SOK intercooler which is little. THink something else would work much better. Ill get some pics up soon

Tauran

There's a Father-son team here in Sydney that has done this totally home-grown on a longhood, a 68 I think. It is street-legal and turns laps at Eastern Creek within 1.0 second of GT3s. The father's name is Ray and he is a mechanical guru but knows nothing about driving. His son is Rob (I think) and he knows nothing about the car but drives the balls off it.

Last month they did a 1.5 hour slideshow on the development of the car and had it on display at the dealership for members to pick over. It is a sight to behold and the coolest part is how down-to-earth the both of them are.

Hi Tauran,

I threw the SOK intercooler out (worthless) and installed a much bigger and better unit (I'll get name tomorrow). The car is running great with the new SPEC stage 3+ clutch but I now need to increase boost to 13-14 PSI and add nitrous for more HP. BTW the SPEC clutch is not very street friendly, more of a race type in or out clutch.

Best regards,
Gerry

911Velocity - what did you end up doing for an intercooler. Right now i have the SOK intercooler which is little. THink something else would work much better. Ill get some pics up soon

Tauran

Pic of my intercooler.

[/B][/QUOTE] http://forums.pelicanparts.com/uploa...1141874484.jpg

I agree, very small and worthless. I am wondering how much something similar to yours was, and any fitting issues? Is this basically the same type of intercooler a turbo engine has?

See e-mail for particulars.

Best regards,
Gerry

I've been reading these threads with interest in supercharging my '79 SC. I have not had any luck finding Superchargers of Knoxville info. Do they still exist? Where else might I find info for one for my car?
Ed

Ed,
You gotta leave a "few" messages at Knox, sooner or later they will get back to you

I don't know if SOK still exists. As I said before this (supercharging) is a very expensive proposition and I don't think I would do it again. Sell your 79SC and use the money along with at least 3X the money you thought you were going to spend on your car and buy a twin turbo. You still will be ahead financially and will have a superb platform to do future upgrades. If you don't think you can afford a TT then I suggest that you can't afford to supercharge your car. But if you must abuse yourself then try TPC superchargers, you can find their ads in Panorama and Excellence. Good luck, you will need it!

Best regards,
Gerry:eek: