ANYONE EVER SEEN FUEL REG SPIKE WHEN COMING OFF BOOST?

[M1000Mod162]

HAD THE 1000 TURBO OUT TODAY AND FINALLY GOT IT RUNNING PRETTY GOOD THROUGHOUT RPM RANGE BUT STILL NO MATTER WHAT I SEEMED TO DO IT WOULD BOG OUT WHEN I WOULD COME OFF BOOST AND TRY AND GET BACK IN IT IMMIDETLY NO MATTER WHERE I WAS AT IN THROTTLE WOT OR 1/4 THROTTLE ANYWAY I STARTED REALLY WATCHING THE FUEL PRESSURE AND IT IS SET AT ABOUT 41 WOULD RAISE TO ROUGHLY 50 BUT I noticed it seemed to be spiking to 54-55ish just for a sec when I let off throttle then go back to where it should be? So my question is has anyone seen something like this before? I'm thinking this could be the problem causing the bog. Going to try a different reg next time but wanted to know what you guys thought?
Thanks ryan

 

[m8magicandmystery]

bikeman reg..??...if so go bdx..they hold firm

 

[WyoBoy1000]

What kit is it? does it have a BOV. It could be a boost spike pushing the reg harder.

 

[Wheel House Motorsports]

yeah, if your boost referenced off your airbox w/o a BOV your getting boost spikes to it, your going to want to reference your regulator to behind your throttle bodies if so.

 

[matt159]

yeah, if your boost referenced off your airbox w/o a BOV your getting boost spikes to it, your going to want to reference your regulator to behind your throttle bodies if so.

I agree that it would lessen the boost spikes & subsequent fuel pressure spikes to reference the regulator from behind the throttle bodies if you don't have a BOV, but I wonder if that would drop the fuel pressure prematurely at 3/4 throttle or make it erratic due to a venturi effect as the charge passes through the throttle bodies.

Through 2008, BD race-gas kits with BOV spilced their pressure transducer into the BOV line from the behind the throttle bodies, but found it made the tuning erratic & now have ONLY the BOV hooked in behind the throttle bodies. I think it was Junior that told me a couple years ago that they suspected a "venturi" effect was responsible for the irregular pressure readings from behind the throttle bodies.... but works just fine for BOV function. Something to consider anyway... may not make much difference on the rising rate regulator like it did on the pressure transducer readings.

 

[WyoBoy1000]

I agree that it would lessen the boost spikes & subsequent fuel pressure spikes to reference the regulator from behind the throttle bodies if you don't have a BOV, but I wonder if that would drop the fuel pressure prematurely at 3/4 throttle or make it erratic due to a venturi effect as the charge passes through the throttle bodies.

Through 2008, BD race-gas kits with BOV spilced their pressure transducer into the BOV line from the behind the throttle bodies, but found it made the tuning erratic & now have ONLY the BOV hooked in behind the throttle bodies. I think it was Junior that told me a couple years ago that they suspected a "venturi" effect was responsible for the irregular pressure readings from behind the throttle bodies.... but works just fine for BOV function. Something to consider anyway... may not make much difference on the rising rate regulator like it did on the pressure transducer readings.

Twisted has been doing it for years, with the oil delete you just hook it up to the old oil nipple in the boot after the TB. Works great and no need for updates, but we also run BOV's and that works great too.

 

[Wheel House Motorsports]

nope, it gets the same signal that your motor is actually seeing.

trust me, do it this way and be happier. get FP for the amount of air actually reaching your motor, not whats pilling up in your airbox.

 

[M1000Mod162]

ttt

It's a push rg kit 3071 with bdx blow off valve and bdx regulator, boost refrence is off airbox! My blow off valve was also fully closed tight (had to use vice grips to loosen it) so it wasn't bleeding off any pressure so hoping this will fix that problem! If it doesn't I will def look into using blow off valves line for fuel pressure ref.
Tthanks for the help guys

 

[M1000Mod162]

where should i get fp ref

So I took it up today and didnt fix problem still seems to flood the motor when coming off boost fpp spikes not quite as bad but still a problem! So should I just splice fp ref into blow off valve line or should I pull it from niples off throttle bodies using oil delete so there available? Thanks for all the help so far please keep it coming

 

[HCM]

So is it good when you come off full boost and get back in it or does it bog then? What box you running and what # are you running. Sounds rich but the fuel pressure can cause that.

 

[M1000Mod162]

No it always bogs when it comes off boost and I try and get right back in it! Found that it is much worse if the motor is under a load for example was in the trees yesterday decided to try and climb a hill in trees so couldn't go real fast but got into boost at about 1/4 throttle but in boost was working great tell I had t o completley let out of throttle and it bogged out to the point of killing the motor! Couldn't watch the fuel pressure gauge there to know what it did exactly but I do know on the lake fuel pressure is still spiking when letting off boost! Sled seems to be running fine other then this problem! But sled is pretty much completely un ridable with this! (Unless I raced lakes all day or did point shoot climbs) its got boondockers new 3d tuning for fuel control!
Thanks again for all your help so far guys!

 

[HCM]

I would say you need to lean the bottom end out a bit. mine does that if i get to much fuel on the bottom end and get out of it to long and it will bog and not pick up works good with a little less fuel on the bottom.

 

[matt159]

So I took it up today and didnt fix problem still seems to flood the motor when coming off boost fpp spikes not quite as bad but still a problem! So should I just splice fp ref into blow off valve line or should I pull it from niples off throttle bodies using oil delete so there available? Thanks for all the help so far please keep it coming

Shouldn't make any difference which one you pull reference for fuel pump from as long as the "bladder" in your BOV is in tact. I read a thread a while back about decreasing the spring pressure in the BOV so they "pop off" easier since there is less vacuum behind the throttle bodies on a 2-stroke. Most of the BOV's are set up for 4-stroke applications. That may help to decrease your spikes also.

Did it make the problem any better since you freed up your stuck BOV? My BOV is typically stuck each fall after sitting all summer, so I lube it a little & I'm good to go for the season... but haven't noticed fuel pressure spikes. I'll have to watch for that.

 

[ESCAPE TIME]

You might try backing your fuel pressure off a psi at a time and see if that helps,they can be finicky to a # or two of fuel pressure.I had one run fine with 42# fuel pressure, then eventualy ended up running best at 38-39#.

 

[snobyrd]

Mine is dooin a similar thing, but I'm looking at my throttle switch.

 

[M1000Mod162]

Talked to Dakota performance they seem to think its likely the bdx fuel pressure regulator. So I'm going to give the stock one a chance with boost ref. Then use my bd box to take away fuel on bottom to make up for the high fp. I'm going to try external reg after that! Then probably a pure logic or attitude for last resort.

I don't think it is in the fuel. I've tried going leaner and richer throughout rpm and after many hours of tuning this is where I'm at. It seems to run really good as long as I don't come off boost the second i come off boost and need to get back in it its not there! If I don't have to get back in it immidetly there is no problem! But I dont know. I'm just learning turbos. I know it will be a blast when I get it right.

Blow off valve is as loose as it will go and I can hear it pop off!

Once again thank you for all the help so far any other ideas or thoughts please post I'm all ears to suggestions!

 

[M1000Mod162]

Mine is dooin a similar thing, but I'm looking at my throttle switch.

What is it that yours is doing?

 

[matt159]

rg kit?

Not familiar at all with push kits... so this may not apply like it did with my bd kit. I assume you have secondary injectors since yours is a rg kit. I had an issue with fuel loading up in the charge box when my secondary injectors were coming on at too low of boost when I 1st got my rg tm8 sled. Mine was really bad. When I would come off of boost & get back into it, it would load up bad enough that it would often drop to 1 cylinder. I increased the cr setting so that secondaries didn't come on until 6.5psi & that fixed it. Mine is an m8, so you may need the secondaries to come on sooner. Just throwing out another possibility.

 

[M1000Mod162]

Not familiar at all with push kits... so this may not apply like it did with my bd kit. I assume you have secondary injectors since yours is a rg kit. I had an issue with fuel loading up in the charge box when my secondary injectors were coming on at too low of boost when I 1st got my rg tm8 sled. Mine was really bad. When I would come off of boost & get back into it, it would load up bad enough that it would often drop to 1 cylinder. I increased the cr setting so that secondaries didn't come on until 6.5psi & that fixed it. Mine is an m8, so you may need the secondaries to come on sooner. Just throwing out another possibility.

Sounds very likely because myn is pretty similar to that only it will kill the motor if loaded! How and where to I adjust the aux inj I'm using a bd box but I've never seen anywhere to adjust the aux Injectors? I'm going up today to try different reg so would like to mess with this while up there today! Thank you Matt didn't even think about something like that!

 

[matt159]

Its the cr setting that u want to adjust. U need to be in advanced mode to adjust it & make sure u only adjust the cr setting or it can mess up the tuning. I am on my smart phone now so searching the forum is a little tedious 4 me. The cr number divided by 4.5 is the boost pressure that the secondaries come on at. If cr=30 they come on at about 6.7 psi. I assume you would want a number around 23 (5psi) and then increase it slowly until it doesn't bog... but I personally wouldn't go past 28 unless someone tells u that is ok for an m1000.