car giving problems any tips.... (damm ford)

so when the car acts good its a mazda but when it decides to act gay its a ford...

so here the problem, since it got cold the damm car has been boosting 17psi.. that way too much boost considering the mbc is set at 12psi.. and the once boost kicks the rmps arent as fast to go up as it used to be.. it sucks.. also i usually hit fuel cut off after 12.5psi.. but now it allows me to go all the way to 17psi and stay there for like 2 sec. then the fuel cut off hits.. it sux, i can floor the car any more b/c it hits 17psi and then i have to let off.. i dont know what the hell is worng, it tried to turn down the mbc but it still creeps to the 17psi, and its bad b/c my fuel sys is good for 12psi at max and thank got the motor can take up to 18psi..so as of now im clueless.. im gona just by-pass the mbc and run a vacume like from the wastegate to the turbo nipple and hopefully it will boost 6psi(that where the wastegate is set for).. and other tips, and can anyone give a reason whey the car feels sluggish under boost, it doesnt pin me in my seat like it use to.. i want my old probe back.. damm car...
thanks
1

You mean you want your Mazda back. Remember? it's a ford now.

As to why your rpms are climbing slower at 17psi. Do you have the stock knock sensor still on? If so then at that boost level you're probably detonating/knocking and the engine is pulling timing back hence a loss of power. Weird, MBC should be very stable hot or cold (some differeces but not 5psi).

Even if the motor can handle 18psi, you're only delivering fuel for 12psi. You can still fry the engine without the proper fuel management, no matter how strong the engine is. Without enough fuel you're gonna be running lean at 17psi. So let's say you're A/F is about 12:1 at 12psi. Your setup only allows for max boost of 12psi, at 17psi your car is only able to deliver enough fuel to run 12psi, your A/F is waaaaaaayyyyy above 12:1 now, which spells trouble for you and your engine. Get it fixed or drive carefully until you can fix this problem.

This is just my opinion but I'm pretty sure this is why you feel like you're losing power.

yea that what i was assuming.. but i dont know... thanks for the info.. any more help..
1

Did you consider a boost leak, that would throw the readings off, and cause you to run slower.
Also if a vacuum line(especially those cheap POS plastic Autometer ones for boost gauges) got pinched it will show higher boost...mine was showing 14 or 15 when I was boosting 12.

But DL72's idea is logical as well.

No he dont have the brains to think of something like that anyone who buys a ford and expects it to go fast does have the brain power to find the source of the problem

so when the car acts good its a mazda but when it decides to act gay its a ford...



:lol: classic.

No he dont have the brains to think of something like that anyone who buys a ford and expects it to go fast does have the brain power to find the source of the problem
grounds for banning... :ouch:

I dont care Ford stands for (F*cked ) (On) (Race )(Day)

I put this as clearly as I can...z28 drifter, you are welcome to your opinions, however ignorant they may be...if you don't like Ford...fine, if you don't like turbos...fine

But you will show respect or your stay here at AF will be very short lived. If you wanna come in here with 16 posts and start insulting the mental capacity of valued members you will be gone. This is your one and only warning. Shape up or bye bye

Sounds much like a pinched boost line to the wastegate. Mine did that and I boosted to nine when I was suppposed to go to five. Maybe a sticky wastegate?

so z28 drifter what all have you done to produce 490 whp?

Sounds like your thread title gives all your problems away. LOL. J/K. I just couldn't resist to say it. C'mon someone else would have sooner or later. Sorry :) . K? Late...

vacume leak?? Thats about the only thing I can think of, also it soundsl like your accuator might be leaking. Mine did and the same thing happend, that is why I bought the Delta gate.

its deffinatly not a vacume leak, i check all my vacume hoses that have anything to do with boost.. i felt no cracks or leaks, im becoming convinced that the mbc is shot.. but the only way im gona know is to run a vacume hose form the wastegate acuator to the turbo nipple, also i know that the boost gauge is reading correctly b/c i hit my fuel cut off after 12.5 psi where im suppose to, if it was reading wrong, the needle would be pinned on 15psi and i would be able to take it to readline but i hit fuel cut off..

as for z28drifter.. he can kiss my ass.. dont you just hate coky newbies that think they know it all, he prorbably doesnt know the difference betweend a wastegate and a bov..telling me i have no brains, if i didnt i wouldnt have a 14sec probe.. yea 14's may not seem like much but when you can do that with 4cyld and turbo its something, i dont neeed 490hp like you...but what ever your comments arent welcome..soo, keep it up and see if you dont get banned..

everyone else thanks for the helpful info, ill use it to try and trouble shoot..

1

1992 Z28 :335 Stroker,GM fast burn heads, High compression pistons 490 HP to the wheels; sucks in the 1/4 mile but its a good drifter

WAIT a minuite, your making 490 at the wheels? but you only run a 13.15@107MPH?????

This is the post with his 1/4 mile time (http://www.automotiveforums.com/vbulletin/showthread.php?t=315193)

:bs: :bs: :bs: :bs: :bs: :bs: :bs: :bs:

Man, HP is a direct corralation (sp) to MPH, I know my car makes 440 at the wheels and I run 11.78@113. I don't care what you say, you are not making 490HP with thoes times. Even with the crapiest tires and the tallest gear, you should be in the 120+ MPH range. :grinno:

WAIT a minuite, your making 490 at the wheels? but you only run a 13.15@107MPH?????

:bs: :bs: :bs: :bs: :bs: :bs: :bs: :bs:

Ma, HP is a direct corralation (sp) to MPH, I know my car makes 440 at the wheels and I run 11.78@113. I don't care what you say, you are not making 490HP with thoes times.

:iceslolan that what i was thinking.. newbies thats a big :nono:
1

490hp huh that thing should go a hell of alot faster down the 1/4 unless you suck ass at shifting!!!

490hp huh that thing should go a hell of alot faster down the 1/4 unless you suck ass at shifting!!!

even then, 107 MPH... it should at the very least be 115

Sorry to hijack your post turbo2nr.

hey no bigge its for a good cause.. but this boost issue sucks.. btw im pulling the plugs tommorow, i know they are gona be white but what else should i look for?
1

turbo2nr IM just having some fun, IM sory really I am.The truth is I owned a ford probe se 1995 and it let me down, so ever since then I have hated all fords with a passion. But on the real you got a good thing going keep it up good luck solving your problem.

My car is actually doing a similar thing. It is running up to 7 and it is in the 60s here. WTF. I'm just guessing that my 35mm is too small.

Man that car has problems on a continual basis. My personal advise is to either sell it ASAP, or to run it to the ground whilst saving money. I think the mileage is what is killing it. Have you looked at a newer car with the same engine, like say the MX6 turbo??? Most people think it's less sporty then the Probe, so you'll have that sleeper factor. I think you should go car shopping.

well basically they stop making the f2t motor in 92, so my car is a 91, its hard to find other cars out there with the same motor and little miles, that the car gives problems constantly, the only reason i have this car b/c it is a free car, it was given to me so im lucky, i spent about $800 into it getting it running to where it is not, cash funds are low now due to college so i have no choice but to deal with it untill i can get a better car..

as for z28racer, yea its cool but dont come flaming some on again, yea you had bad experiences doesnt mean all probes are bad, and the 2g probes are alot slow the the turbo 1gs... any way thanks for the help
1