s13 coupe sr20det

[xops13]

Ok, When I give my sr20 full throttle, the motor kinda sputters back and forth around 4k rpm's like its not getting the right signal to the computer, or enough gas. most times I give it about 50% throttle and it climbs the rpm's fine, but then it starts to jump back and forth again at higher rpms....

I swapped out my old waste gate for the Hks and my turbo is fine.I checked my spark plugs. Im pretty sure I dont have any boost leaks, i checked both of my TPS and Maf sensors.

Do you guys think it could be a faulty fuel pump?? If not, can I get some advise or helpful tips. I just want my car to run right....

[LayNLow]

Check to see if the ecu is throwing any codes first

[xops13]

alright thanks bro

[JDMxJosh]

i had the EXACT problem.

did you try checking the timing?

[ford_o]

check your fuel tank cuz the fuel pump and tank have nasty shit in there causing it to clog up

[xops13]

i havent checked my timing but i will check that. i just bought a walbor fuel pump so im also gonna install that aswell. thanks

[steve shadows]

Timing is CRITICAL!

This is the most important thing to getting an SR to run correctly

In 99% of cases, even "experienced" shops still do not know how to properly set the base timing or what to set it at...

Also check your intake tube off the turbo.

Many people running bottom mount tubos on swap are running the stock rubber intake tube that comes off the inlet of the turbo. If you are missing the big METAL spring that is supposed to go inside this tube then the tube will collapse on itself under high load and your car will sputter and not accelerate well or consistently over 4-5000 rpms.

If you're interested in a diagnosis and tune up session with me I offer this service at my place in Long Beach for 80 dollars. I highly suggest you bring the car down for this if you don't feel comfortable or have the tools to properly set your spark plug gap, base timing, tps sensor and engine settings.

[GroundHog]

check your maf settings