weird bobbing during spool up

[JoeyJigglesGSX]

i dont know if it is because it has been really humid out or what in my area, but for some reason sometimes say i want to get on it a little and this only happens if i start pretty low at like 2500 rpms but the turbo feels like this...

say you are sucking through a straw and there are air pockets and it speeds up till you get another bit of liquid and slows then once you get a constant flow its fine...that is how my car will run sometimes... it kind of hobbles then all the sudden kicks in and pulls?

like i said its only when it is at low rpsm and never does it in 1st or 2nd gear, if i did this at anywhere 3,000 and up in 3rd, 4th, or 5th it is just a constant pull...any ideas?

or is this normal?

 

[ddavisaf]

One question then we'll answer this bugger.

Part 1: What size injectors?
Part 2: What kind of Fuel Management?

 

[JoeyJigglesGSX]

haha...the only thing i have for fuel is 255 lph fuel pump

 

[ddavisaf]

That's your problem. You'll need to get a FMU before anything else.

 

[JoeyJigglesGSX]

really? can you please explain a little more?

 

[JoeyJigglesGSX]

i thought i was cool with the bigger fuel pump...i only run 17/18psi and people say im fine...or no?

 

[JoeyJigglesGSX]

you still alive man?

 

[oldman]

Could be a lot of things, most obvious:

1. Boost leak.

2. plugs and wires.

3. Stock fpr overrun.

Look into those first and see what happens.

 

[JoeyJigglesGSX]

Could be a lot of things, most obvious:

1. Boost leak.

2. plugs and wires.

3. Stock fpr overrun.

Look into those first and see what happens.

1. i should check for a leak...ok tell me this after installing my upper intercooler pipe i had a very hard time getting my BOV to seal right. When i ran a leak test it was leaking pretty really bad right between the flange and the BOV, i had the stupid little blue gasket that comes with the BOV. I took it to a shop and they put some blue sealant crap on there and said that should do it. I am sure its fine, yet i have never tested it again. But even if it did leak there, would it cause that much of a problem? or would it not make any difference?

2. my plugs and wires should be ok

3. and how much is an FPR and can you elaborate a little more on it. I assume that means Fuel Pressure Regulator? i have a 255 lph fuel pump if that helps?

Thanks

 

[oldman]

1. i should check for a leak...ok tell me this after installing my upper intercooler pipe i had a very hard time getting my BOV to seal right. When i ran a leak test it was leaking pretty really bad right between the flange and the BOV, i had the stupid little blue gasket that comes with the BOV. I took it to a shop and they put some blue sealant crap on there and said that should do it. I am sure its fine, yet i have never tested it again. But even if it did leak there, would it cause that much of a problem? or would it not make any difference?

How much pressure were you able to pump into the system and for how long? Just because you found one leak and POSSIBLY fixed it doesn't mean there are no other leaks.

2. my plugs and wires should be ok

What kind of plugs? Gap to .028"?

3. and how much is an FPR and can you elaborate a little more on it. I assume that means Fuel Pressure Regulator? i have a 255 lph fuel pump if that helps?

http://www.dsmtuners.com/parts/default.php?cPath=2_140_81
Do not get the Command flow!!

Fpr overrun means the stock fpr is unable to bleed off the extra fuel been pumped into the system by a higher flow pump like the 255 you have, causing you to run rich during idle and part throttle.