51

iTrader: (8)

I am about to install a new FD Red HTZ JB turbo with FP cast O2 housing, FP 84mm intake & Tial MV-S waste gate & need some help/advise.

My plan is to run 93 oct & other mods that is already on the car are full turbo back exhaust, 3.5 FMIC, full intercooler piping & MBC.

What is the minimum spring psi should I set up the Tial MV-S waste gate?
Would I need bigger injectors? If so, what size should I get?
Would I need an upgraded fuel pump? If so, what should I get? (I prefer a drop in fuel pump with no mods needed to it)
Should I switch from MBC to EBC (Grimmspeed)?

4b11slayer

I love ebc vs mbc.
15 psi spring
fuel injector clinic 1450cc
walbro 450
Cams

LetsGetThisDone

iTrader: (1)

MBC will be fine, the external tial gate controls boost much better than the MHI internal gate would. the 15-16psi springs option will work fine for 93 octane. On pump gas, 1000cc injectors will do fine. You will at the minimum need a walbro 255. Depending on how much boost you run, you may run out of pump and may need to upgrade to one of the higher flow drop in pumps, or a walbro 450lph.

51

iTrader: (8)

Thanks for the feedback but now I need to be educated on this spring pressure. Let's say that I am planning to run 25psi, why only put the 15psi spring & not go higher close to 25psi spring?

Bmurray

iTrader: (5)

I'm running FP Red MHI housing. at ~83% IDC with 1200cc PTE injectors and aem 320lph e85 pump with stm rewire kit. im running the 18psi wastegate. im also running the grimmspeed 3 port and i like it!

sullivan1337

iTrader: (1)

Yeah agreed. At least a 255

I have a 255, ID1300, and bb fp red. and 255 is perfect for me

LetsGetThisDone

iTrader: (1)

It's better to spring an external gate lower than target boost, then turn it up with the boost controller. You don't want your first WOT pull to be 25psi while the tuner is still dialing in timing and fuel.

4b11slayer

Also if your hoses pop off boost control device and the turbo just wants to spool to heaven. The lower psi spring will help you save a motor.

4b11slayer

Meaning the waste gate will open at 15 psi if a plumbing issue happens

LetsGetThisDone

iTrader: (1)

No it will not. 15psi springs means 15psi from the reference line opens the gate. Without the reference line, it will open much later. This is why good fittings and zip ties are important on the wastegate and boost controller lines.

TheBoz

iTrader: (9)

It is very easy to change a spring out. I run a 10psi spring with a 4port ebc and I can anywhere from 14psi to 40psi. But the 15psi spring is solid advice. Ebc vs mbc is all about your tuner, mbc is just easier to setup.

Are you ever planning on going e85 if so just go a little bigger on the fuel system. You can also run a higher base fuel pressure to get more fuel but your pumps will not like the higher bfp.

talonkev

iTrader: (5)

I have a SS Green and put the "20.3 psi" spring set in my MVS. With my MBC bypassed, the actual wastegate base boost pressure is 27 psi. I'm currently swapping it out for the "17.4 psi" spring.

talonkev

iTrader: (5)

The "17.4 psi" spring on my setup lowered the boost down to 25 psi base wastegate pressure