Big turbo issues Nov 7, 2019 21:56:26 GMT -5
Post by boostbird on Nov 7, 2019 21:56:26 GMT -5
I am new to the forum but have been in the 2.3 game for a while. I have a 88 Turbocoupe and had a 85 Xr4ti before that. I have been working on this car for a few years now and recently got the car running and driving but with issues.
My set up is:
Stock 2.3 turbo long block
Stock LA3 and big VAM
Motorcraft spark plugs gapped to .025
Motorcraft plug wires
MSD blaster coil
Holset he351cw turbo
custom made tubular manifold out of schedule 10 304 stainless piping
Tial MVS 38mm external wastegate
Custom upper intake with 70mm BBK throttle body
Large Godspeed front mount intercooler 3" in and out and 3 " piping
walbro 255 pump
Kirban fpr 40psi pressure vacuum disconnected
-8an braided fuel line pressure and return
Moroso catch can setup
custom 3" exhaust with straight through 3" amazon muffler
I feel that I am forgetting something but anyways I feel that my wastegate is to small for my desired boost level. I started with a 8 psi wastegate spring setup and it would creep to 10 to 12 psi. I then swapped the springs out for 15 psi and would creep to 20 psi and would get fuel cut with AFR in the mid to low 11 range. Then I figured there still was not enough wastegate spring for the Holset and tried 20 psi spring setup but hitting fuel cut before full boost.
Now I figure that I am maxing out the stock brown top injectors but I do not know if it makes more sense to upgrade to a Tial 44mm wastegate for more flow which means I have to re-engineer my manifold or just stick with the 38mm and go PIMPx standalone and larger injectors. I know the rule of thumb is big turbo on low boost = big waste gate or big turbo high boost =smaller wastegate. Curious if anyone has encounter this problem before, I figure the Holset would work okay with the 38mm tail since the exhaust housing is 9cm maybe I was wrong.
I am just trying to get some advice from some real 2.3 turbo Guru's that have run a setup like mine.