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Hello everyone, i am new to this forum . I searched everywhere on the internet and checked with local tuners/garages all over Malta . I cannot find a solution to the problem i am having .
The car is a Honda civic eg with a b18c type r motor. At the moment it is bone stock internally .
It has id 1000cc injectors ,Borg warner t4 turbo Afi Turbo manifold with a tial 44mm external wastegate ( 4psi spring) . Tuned by a very good local garage on hondata v2 .
Problem is, we cannot get it anywhere close to hold 4psi on the wastegate spring . On 1st gear it's fine, 2nd gear goes straight up to 10 psi with boost cut coming on and on 3rd gear it goes higher than 16psi with boost cut coming on .
Has anyone ever came across this issue ? Iv'e checked and re checked everything . Wastegate is fine ,not leaking .
Before i had a cheap ebay turbo manifold which i ended up cutting another hole in it and welding another wastegate which solved the issue but i really dont want to do this to this turbo manifold. One is for the lack of space, and 2 i am hoping for someone to come up with another solution rather than chopping this manifold as well.
Im told that the wastegate isn't efficiently blowing out enough exhaust hence the boost going through the roof. But what can i do please ?
I never had this issue with my old integra with forged internals and 9.0 compression running 10psi .
You aren't going to control such a large turbo with a 4psi spring with a wastegate entry 90* from the collector. It does not work like that. The turbo simply moves too much exhaust and has no back pressure at 4psi to force it through the wastegate. Run the proper turbo, add a wastegate, or run a higher psi spring.
Like 850fab said no way are you going to get close to 4psi with that big of a turbo on a single 44.
I knew before I scrolled down that you were on a ramhorn manifold. That manifold design doesn’t like low boost with big efficienct turbos, poor wastegate priority and small 90 degree outlet.
Best bet is to modify the manifold for at least a 50mm gate and run more then 4 psi.
Not sure want fuel you are running but the motor can handle a moderate amount of boost.
And hello fellow Maltese guy (not in Malta- but have family there).
we have the same afi ramhorn manifold and tial 44mm wg on costumer car. 10:1 pistons..eagle rods and supertech springs. turbo is an garrett t3/t04e .82ar. it hold 8psi all way no problem! its all on turbo size.
04-30-2018, 11:09 PM
Honda b18c type r turbo
(not in Malta- but have family there). 
