Boost problems

[Koko08]

My car pulls harder @ 50% throttle and holds boost at 20psi but full throttle the b0ost seems to hit 20psi then drop about 13-15psi? Is the turbo to small??? Or is my injectors are to small?? Td05h and 510cc injectors ??? It just feels like it loses power at full throttle. (rocket) between 2400-4000rpm (loss Of power)4000 up rpm. Anything I need to up grade???

 

[chariotgthk]

Mine acts the same since day 1 I have it.

 

[dj_konix]

sounds like it is boost spiking upto 20 and then dropping off..what are the exact mods done to this? exhaust size? upgraded cooler piping? etc

 

[Koko08]

My spikes at 21-24psi but the boost it should be at is 20psi that's where I set it but only holds boost 50% throttle. My mods td05h 510cc tomei fpr walbro fuel pump, and tune by last owner ayear ago (ecmlite) 3" turbo back hiflow cat 100cell and to my varex cannon 5" tip no resonator

 

[vr401]

My spikes at 21-24psi but the boost it should be at is 20psi that's where I set it but only holds boost 50% throttle. My mods td05h 510cc tomei fpr walbro fuel pump, and tune by last owner ayear ago (ecmlite) 3" turbo back hiflow cat 100cell and to my varex cannon 5" tip no resonator

maybe it's knocking and it retards the timing as well.

 

[Koko08]

How can that b fixed?

 

[Koko08]

And I realized today when I'm on 4th gear full throttle @3000rpm boost drops to 16psi and 5-8sec of full throttle the boost decide to go up to 20psi and stays there. I was taking note. So the boost figure is like this on full throttle : 2400rpm up 20psi then 3000rpm drops to 15-16 psi (still full throttle) then 5-8sec it gos back to 20psi at about 4xxx rpm and holds 20psi 4000+ rpm

But 1st 2nd 3rd gear is fine holds boost good

 

[ULS33-RVR-GO]

And I realized today when I'm on 4th gear full throttle @3000rpm boost drops to 16psi and 5-8sec of full throttle the boost decide to go up to 20psi and stays there. I was taking note. So the boost figure is like this on full throttle : 2400rpm up 20psi then 3000rpm drops to 15-16 psi (still full throttle) then 5-8sec it gos back to 20psi at about 4xxx rpm and holds 20psi 4000+ rpm

But 1st 2nd 3rd gear is fine holds boost good

I believe you can log your stuff using ECM tuning chips right? Could that data hold some information regarding your loss of boost? It might speed up the diagnosis a lil quicker. Btw, have you done any tuning with the ECM yourself?

 

[CLuTZ]

Have you pressure tested your intake? What B.O.V are you running? They sometimes leak too.

 

[Koko08]

I'm using a turbosmart Vport and the spring on the bov is set hard