I'm Back...

[spoolinmp3]

One question about the J&S, I thought we covered last time, but just for clarification in this thread too. Does it use it's own source to detect knock or does it rely on the stock sensor already in place from Mazda, and you hack into the signal??

I am not well versed on this unit. From my understanding it does utilize the stock sensor.....however I am unsure. I do not sell these things, you may want to contact J&S on your own, they are very popular amongst the miata community and I know they work very well

Lookin foward to seeing the literature on 9psi....I hope this is true. That would be sweet

 

[Keith@FP]

I'll find out tomorrow. I don't think it uses the stock sensor because it's often used on the 1990-97 Miatas. Those don't have a factory knock sensor.

Keith

 

[70]

I'll find out tomorrow. I don't think it uses the stock sensor because it's often used on the 1990-97 Miatas. Those don't have a factory knock sensor.

Keith

Wonders what Keith is doing on the board so late? Working on the race car again??

 

[big_ben]

Actually, both of you are right about the J&S. On some cars it uses the factory knock sensor, on some it doesn't. On the MP3 it uses the factory knock sensor and you just splice into it at the ECU. But if the car isn't equiped with a knock sensor, you have to buy one for $25.

Also, I wouldn't recomend using the J&S as your primary means of controling timing if you are running 8psi or more. The J&S is exactly what it is named, a "Safeguard". If you want to run 8psi and retain full advanced timing you can because as soon as it hears slight ping, it will retard the cylinder that just pinged and that cylinder only. Also, the newer unit that I bought, has a MAP sensor, and when I talked to John, that guy that builds them, he said that this new J&S unit was able to actively retard timing according to the amount of boost. I'm not positive on this because I never had a chance to install it, but that's what he said.

 

[Protege01MP3]

wow... sounds like a damn good safeguard... seems like it might even be slightly difficult to blow a motor w/ the J$S and if its well tuned soon as i boost I think I'll make sure to invest in one of those suckers

 

[1sty]

I don't need anything to retard the timing just something to say, BACK OFF THE GAS NUMBNUTS! I can take care of the rest.

 

[Protege01MP3]

ok.. this may sound dumb... as I do know considerable amnts about boost... but nowhere NEAR any of you... why does it sound to me, from what you guys are saying, it sounds like you cant drive your car for more than 30 seconds at a time while under boost??? but.. every time you reach a certain rpm range doesn't the turbo spool up? so r u supposed to drive "carefully" and just make sure you shift before you reach that rpm range?? or is it just that we cant handle more than 30 sec of boost under WOT conditions?? can someone clarify this for me?? because I KNOW that it cant be that you arent supposed to drive for more than 30 sec at a time... that just is not practical AT ALL... i mean.. c'mon... i'm assuming and hoping you guys mean that you can only "race/push/abuse" the car for about 30 sec before everything heats up way too much and problems start poppin up??

any clarification would be appreciated... linux? spoolin? where iz u jiggahs be at gangstah?

 

[Keith@FP]

The turbo will not necessarily generate 6 psi unless you ask it to. Give me a turbo car, and I'll give you whatever boost level you want (up to the maximum attainable) simply with throttle control. It's like saying that your car makes 100 hp every time you go over 4000 rpm - that's not true. It's only true at full throttle.

The MP3s have advanced timing over other Proteges. It's part of how they make more power in stock form. Unfortunately, this extra timing is problematic for boosted cars. We're working on a solution, as are others.

Corky recommends not being at full boost for more than 30 seconds. Here in Colorado, we can be at full boost for 30 minutes while climing a pass. Our poor tow vehicle - a Toyota pickup that we turbocharged - will run boost for the next two days as we tow the race car to California. With proper fuel and timing and a reasonable boost level, I wouldn't be too concerned.

In a Protege, 30 seconds at full boost is a top speed run unless you're climbing a mountain....

Keith
FM

 

[Protege01MP3]

nice! excellent job of clearing that up keith! thanx.. i appreciate it... now i have a much better understanding of what was being talked about. it seems to make sense, but i never realized it, that the wider open your throttle is.. the more power the turbo will generate, seeing as how the turbo is spun by exhaust gasses, correct?? it just never clicked in my head till right now... once again.. thanks keith!! and you guys r #1 on my list of turbo providers... just so you know to expect some business within the next 6 mo

 

[1sty]

The thing i am still wondering about is why the car can't produce boost when reving in nuetral. Its not like I want to just wonder why it doesn't

 

[Keith@FP]

There's no load on the engine.

Later, guys. I'm off to the race track for a week...

Keith

 

[70]

There's no load on the engine.

Later, guys. I'm off to the race track for a week...

Keith

Have fun in California Keith...Lucky dog!

 

[1sty]

Adios.
Thats what i figured