There are hight and low buttons on the profec b, I have mine on low all the way down so it is basically just using the wastegate at 10 psi, if I switch it to the high setting all the way down is it gonna make a difference in boost pressure?


Synopsis: Does the High setting start higher than the low setting all the way down?

 

Is it the Spec II and do you have the manual. If it is and you don't I can look it up in mine for you.

 

No its the spec I, i dont know how different they are, thanks for looking

 

does it have 2 buttons (MODE and SELECT) and one **** (SET) and a digital display? I checked my spec II manual and it only states the default settings for the unit in the (LO) mode as 0% boost, 10% gain, start boost @ 0 kpa, limiter 0%. I think there may be a manual avail online, I found one for the spec II a while back.
chris

 

i was wondering this too... i have the spec 1 still. i guess i'll google and see if i can find a manual and help us both out and maybe more!

 

The Profec B Spec 1 -- the hi-boost **** starts ~3 psi higher than the lo-boost.

Turning the low-boost **** all the way down will not give you 10 psi, probably more like 7 psi (assuming stock twins).

 

don't mean to hi-jack the thread, but i also have a Greddy EBC, there is HIGH BOOST, LOW BOOST, and there is seprate dial that has 'SHARP' and 'MILD', what does that dial do?

 

It controls the response profile of the wastegate. Do a search using "profec", "gain", and my username, and you should get my tuning suggestions.

 

Mods are in my sig, im single so it makes like 11 psi, I dont think the stock clutch can take 14 pounds cus that would be around 340 and it would go I think.

Thanks rynberg.

 

how do i turn it down to 0psi i have a new motor going in next week hopefully...?

 

You can't. And there's no need to anyway. There's nothing wrong with light boosting on a new motor, in fact it's a good thing.

 

well my very well known enging builder said 0 boost... sooo uhhh i will listen to the very smart CHRIS ROGERS. there has to be some way to go 0psi besides taking off the turbo... someone anyone have an idea?

 

There isn't. Perhaps you should ask yourself why no one else does anything special during break-in to eliminate boost from occuring.

 

It the great words of Mad_7tist put a rock under your gas pedal. Just use some self control man I stay out of boost most of time I drive around town, just keep an eye on your boost guage. But if you really want to you could just disconnect one of your IC pipes and run a filter on the elbow, thats what i did when i first installed my single turbo cus i had no pipes lol.

 

You will probably have to roll the car around by your own strength as opposed to actually driving it because no matter what you're going to get a little positive manifold pressure when driving around--unless you're driving downhill constantly. A few psi won't kill you as long as the thing isn't leaning out and your timing isn't too advanced. Search on "pills" and you can run the car around on 7 or so psi. I did that for 1000 miles, boosted a bit here and there up to 7 psi (not WOT) during my motor break-in. Thing purrs like a kitten, idles well, starts right up hot or cold, and has good vacuum.

 

maybe i will dissconnect some piping i never even thought of that! and guys i know i seem stupid but theres good reason to why i want to stay out of boost... im buying a map from john (jbenny) and its obviously suspose to be close but you can never count on that. im breaking the motor in with that map then im going to take a long trip to ray wilson for extensive tuning. im just being very carefull as i've put a shitload of money into this motor. i dont feel like spending money again on the porting, machining, every seal in the motor, and the oem 3mm seals. its way too much for me to lose out on. plus the shortblock i sent him he said was one of the best ones hes ever recieved so i dont want to blow all the good luck i have so far! thanks for the input and the respect of not being yelled or flamed.

 

There is nothing wrong with hitting a few psi during break-in. It's not like you are going WOT or anything! Any map you load will be just fine for the normal 2-5 psi you easily hit just driving around.

 

I agree about the boost because you need to vary load and rpm and such during the breakin, but to each his own. I drive around out of positive manifold pressue all the time its not hard to do? Under normal acceleration on street driving im only getting to the most 2 inches of vacuum. Im pretty sure I read on nopistons that Ito drives his new rebuilds into the city 50 miles round trip and then does a burn out and its broken in haha.

To each his own man sounds like a hell of an engine good luck!

 

HEY GOOD NEWS GUYS!!! i found my copy!!!!!!!!! i took the time to scan the whole thing... now i just need a good place to host it. any suggestions. i would like to contact someone to make it a sticky as a lot of people have these and it would be helpful.

 

I 2nd that. I left mine at a friend's house and need another one to read