81.5MM TURBO GSR... S200B, T3/67H.O RUNNING PERFECT FOR 3 YEARS

msd box, blaster coil, distributor, msd wires, fuel pump, injectors, resitior box, fpr, tuning has been perfect for 3 years on s200b, everything that would cause detonation has been gone over twice... everything tested including tps calibration
I HAVE NO OTHER IDEAS WHY MY CAR IS DETONATING.. IVE GONE OVER WHOLE IGNITON, AND FUEL SYSTEMS... EVERYTHING CHECKS OUT... IM INCEDIBLY STUMPED AND AM OFFERING A 500$ REWARD FOR ANYONE WHO CAN FIX THIS PROBLEM IN CENTRAL FLORIDA... ANY IDEAS ARE GREATLY APPRECIATED

 

how do you know its detonating...it may just be a misfire

if the motor is burning oil it will detonate from that...

 

Did the problem happen after you filled up with gas?

 

a/F SUDDENLY JUMPS FROM 11.7 - 15.8 AS SOON AS IT HITS 7000 RPM IN 4TH AND 5500 IN 5TH ON WIDEBAND... PROBLEM STARTED WHEN I CHANGED FUEL PUMPS BECUASE OLD PUMP DIED FROM LOW FUEL... CAR RUNS RICH AT IDLE AND LEAN UPTOP... ITS NOT A MISFIRE... I WISH IT WAS... CAR WAS RUNNING RICH RITE AFTER PUMP CHANGE AND FOULING OUT PLUGS IN 100 MILES BUT THEN BEGAN RUNNING LEAN ON HIGHWAY AND DETONATING UNDER BOOST...

 

Like he said it could be oil, but it sounds like a fuel delivery issue. Have you checked out your fpr? it could be that the fuel pressure is not right/vacuum signal is not working on it. Is your new fuel pump a different one than the old one?

 

ARE YOU ASKING IF I PUT BAD GAS IN THE CAR NSXMATT?

 

YEA I THOUGHT IT WAS A FUEL DELIVERY ISSUE AS WELL... SAME WALBORO HP PUMP AS BEFORE... THE FPR READS 44PSI AT IDLE AND VACUMN IS AT 16-18 BUT BOGGS AFTER A FEW SECONDS AND FUEL PRESS GOES UP TO 50PSI AND VACUMN GOES BETWEEN 11-13... I HAVE NO VACUMN LEAKS AT ALL... IM SOOOO STUMPED

 

I was hinting at bad gas but since you left out the part about changing fuel pumps i'd say it would be something else

I don't know if it's a bad pump or maybe your regulator even.

 

sounds to me like i would start back at the new fuel pump.. the pump is supplying the motor with enough fuel to idel and so on.. but at 7000 RPM and boost, that pump is working its *** off (for some reason). Maybe the piick-up screen is clogged. Maybe your fuel filter is dirty now with now pump. Maybe you got the wrong pump compared to the other one....

I would start with the fuel system. your lean out issue is there is not enough volume of fuel at that rpm. At low Rpm the Fuel PSI and volume will be there.. but not on the big end..

Also. Check you spark plug gap.. I would set it to like 28.

 

i checked twice with walboro with the serial # on the pump, same pump.... brand new fuel filter and pickup filter is brand new and pump has been gone over three times.... full tank of gas as well....sparkplug gap is at 26 so i doubt it will make a difference(thnx tho)... the fpr has a guage on it, on dyno it rises steady until detonation... BTW it only detonates in 4th and 5th... 1-3 run perfect and a/f never goes above 11.8.... the car has been to cft, and Maxworx(john fergeson) and columbia the tuner for hdm is stumped too... maybe a short in the harness somewhere but where???? i though maybe the gasket on intake mani or TB might have gone bad and mesed with vacumn but both are good....
IDEAS!!!! lol

 

If the fuel pressure is falling when it happens, then it's real simple, it's a fuel related problem. There's not many pieces to the fuel system, a pump a filter, a regulator and wiring. Figure out which is the problem and replace it...

 

fuel pressure builds perfect in gears 1-3... 4th at 7000 it detonates and rises and drops drasticly, also when it begins to detonate i let off the throttle so i damage as little as possible... if it was a pressure problem i could see the pressure raise and maybe stop at a certain psi then detonation or the pressure dropping off right before it detonates but it the only time the pressure seems to change is while detonating.... what could it be fuel related if the pump is brand new, if the filters are good, the wires are fine as well... if it was the diaphram in the te fpr wouldent the fuel pressure be all over the place?

 

So the fuel pressure drops at the same time it goes lean and detonates? I can't say what your problem is, but it's related to the fuel system. It didn't do it with the old pump, right? You put a new pump on and it started doing it. Have you tried another pump? Just because it's new doesn't mean that you automatically count it out. How do you know the wiring is good? Have you monitored voltage at the pump when the problem is happening?

 

yea this happened when i replaced the pump... is it common for new pumps to work improperly, arent they tested somewhat before they are shipped... no the voltage was never tested on the wiring to the pump, yet the whole wiring system for the pump was gone over and there were no problems... what should the voltage be on the pump under a full load and what would cause the pump to get thw wrong voltage, short in the harness maybe?

 

pm'd

 

i dont have PM since in a noob.. i think atleast it doesnt come up when i go online... 954 232 9399

 

bump

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote"> Have you monitored voltage at the pump when the problem is happening? </TD></TR></TABLE>


Ive had this problem before. I'd check the volts to the pump and make sure the volts arent dropping.

maybe: bad battery, bad altinator, slipping Alt. belt, Slipping Alt pulley, differnt Alt pulley? Maybe bad ground....

Check your volts during your pulls.

Also, What is your tank at? is it "full" Depending on how hard your car pulls, it can go lean on topend if it isnt full. I leaned out in top of 4th w/ a 1/2 tank before w. a walbro... cracked a sleeve cuz of it too. Top your tank off if it isnt already.

"also" check you supply line at the tank. if it isnt sealing 100%, you may not notice it but it can suck air and cavitate the fuel if this happens.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by redskittle &raquo;</TD></TR><TR><TD CLASS="quote">yea this happened when i replaced the pump... is it common for new pumps to work improperly, arent they tested somewhat before they are shipped... no the voltage was never tested on the wiring to the pump, yet the whole wiring system for the pump was gone over and there were no problems... what should the voltage be on the pump under a full load and what would cause the pump to get thw wrong voltage, short in the harness maybe?</TD></TR></TABLE>

I'd say check the voltage to the pump and find out what its doing under load. I would bet voltage is dropping off and thus pump volume is dying off as well. Pressure isn't as important as volume.

 

appreciate it... jw what the voltage should be under load? also how do you test if the alternator is not pushing the right voltage...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by redskittle &raquo;</TD></TR><TR><TD CLASS="quote">appreciate it... jw what the voltage should be under load? also how do you test if the alternator is not pushing the right voltage...</TD></TR></TABLE>

From what I show, the fuel pump is driven off terminal 7 of the main relay. Its supposed to show "battery voltage" at the connector also with the key on. This might sound kind of strange, but I would rig up two meters. One showing voltage directly at the battery, the second showing voltage at the pump connector. A third gear pull should show you if there is a high voltage drop at the pump..

Using just a meter, the only real way to test the alt is to take a reading at the battery with the car off, and then with it on and running. Off should show around 11.7-12.0 volts, and running should be ~14.4 volts. Asside from that, you should be able to get your alternator tested at any autoparts store in your area for free.

 

$500 reward huh? Bring it by Titan sometime during the week, i'll take a look at it for you.

-Darin

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Darin D. &raquo;</TD></TR><TR><TD CLASS="quote">$500 reward huh? Bring it by Titan sometime during the week, i'll take a look at it for you.

-Darin</TD></TR></TABLE>

lol this guy has no money his broke

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Darin D. &raquo;</TD></TR><TR><TD CLASS="quote">$500 reward huh? Bring it by Titan sometime during the week, i'll take a look at it for you.

-Darin</TD></TR></TABLE>

ill do it for $400.

haha j/k darin.

good luck w/ the fix

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mase &raquo;</TD></TR><TR><TD CLASS="quote">

ill do it for $400.

haha j/k darin.

good luck w/ the fix</TD></TR></TABLE>

lmao