2G RC 750cc with Re-Wired Walbro 190

[SAUBIK]

Hi guys, i did alot of research, so i figured out 750cc with 190lph will be perfect to work together (in order to reach limit flow together)

I have fully rebuild N/A 4G63 with turbo pistons, all new gaskets, bearings, rebuilt e3 16g, ARP on whole bottom end and some porting on the head, like knife edged intake ports, oil port mod in the head and ported oil galleys.

Can you ensure me in my opinions ?

Btw - all things i did is in my build page in profile

 

[Spleen8urLSX]

Go bigger than the 190lph. It might be enough for what you’re doing now with the 16g assuming you’re using pump gas, but if you upgrade anything beyond that it likely won’t be enough and if you’re planning on e85 it likely won’t be enough (nor will those injectors). I would go with a 255lph pump at minimum though if it was me I’d opt for the 450 or 525, and at least 1000cc high z injectors. Again I know it’s more than what you need now, but if you were decide to upgrade you’d be kicking yourself for having to buy injectors and a pump all over again. This is assuming you have the engine management to control the injectors and an adjustable fuel pressure regulator to avoid over run.

 

[SAUBIK]

In my country e85 is not available, so i dont plan to do it …350 - 400bhp is max in my case, otherwise i will need to exchange half of the car

 

[Jacob5se]

750cc will be more than enough, but as @Spleen8urLSX said, go with bigger pump. 255 lph is IMO way to go.

 

[Spleen8urLSX]

750cc will indeed be enough, however if you ever think you’ll want more than the 16g has to offer later down the road my theory is buy once cry once. If you’re set you won’t ever upgrade sure, but going bigger now will make life easier if you upgrade down the road.

 

[Jacob5se]

750cc will indeed be enough, however if you ever think you’ll want more than the 16g has to offer later down the road my theory is buy once cry once. If you’re set you won’t ever upgrade sure, but going bigger now will make life easier if you upgrade down the road.

Going with anything bigger than 16G is a pretty big hassle in Europe. Even in US (where availability of parts isn't a concern most of the time) going bigger requires quite a lot of upgrades over stock car, and in Europe parts availability, knowledge and prices are often a "deal brakers" when it comes to making over 350hp.
I found this out while building my 400hp+ street car here in Europe.

 

[trogador2005]

That combo will be just fine. (hot take) you can even run that combo with the factory fuel pressure regulator! If you went with a 255 rewired, you would need an aftermarket pressure regulator to not get overrun with too much fuel.

 

[ErikTande]

That combo will be just fine. (hot take) you can even run that combo with the factory fuel pressure regulator! If you went with a 255 rewired, you would need an aftermarket pressure regulator to not get overrun with too much fuel.

I've read posts saying the oem FPR can even handle a 255...

 

[trogador2005]

I've read posts saying the oem FPR can even handle a 255...

It can! From personal experience it's does just fine, however, if you rewire it and have a really good electrical system and feed that puppy 14+ volts at all times, you can run into some overrun. But yeah stock wiring with a 255 is just fine. I would almost prefer that, to not have to hack into the wiring.

 

[jdxnc]

I wouldn't even bother with low z injectors now. 255 and high z 1000cc injectors are the go to in 2024. Buy once, cry once.

 

[SAUBIK]

750cc will be more than enough, but as @Spleen8urLSX said, go with bigger pump. 255 lph is IMO way to go.

Rewired 190 is like 95% of stock 255, so why now buy new,, with Aftermarket FPR, when i have 190 home already

750cc will indeed be enough, however if you ever think you’ll want more than the 16g has to offer later down the road my theory is buy once cry once. If you’re set you won’t ever upgrade sure, but going bigger now will make life easier if you upgrade down the road.

Upgrade is not the way close few years… i already did financial suicide, when i decided to rebuild N/A to over stock Turbo with “brand new” engine 16G is all i need. That power is more than enought for FWD, so if i decide to make 4X4, then i will think over adding power… before that it will need to rebuild over again with forged parts. Sooner not. And of course i dont want to do this because im afraid of crankwalk…

Going with anything bigger than 16G is a pretty big hassle in Europe. Even in US (where availability of parts isn't a concern most of the time) going bigger requires quite a lot of upgrades over stock car, and in Europe parts availability, knowledge and prices are often a "deal brakers" when it comes to making over 350hp.
I found this out while building my 400hp+ street car here in Europe.

thank you

That combo will be just fine. (hot take) you can even run that combo with the factory fuel pressure regulator! If you went with a 255 rewired, you would need an aftermarket pressure regulator to not get overrun with too much fuel.

I know, for that reason i want to stick with 190

I've read posts saying the oem FPR can even handle a 255...

255 with regulator and lower the pressure to 43.5 psi, in that range whole fuel system work perfect