How-to Turbo your BP

[Mazda_Powered]

14.7psi is the max output for the vj-20 doesn't mean you can't hybrid it and run higher boost levels.

the stock BP is good for around 250-275reliable whp depending on the condition of your engine.

JACK.

[D323]

denis ran 20 something PSI w/o issues for years.

Its all in the condition of the engine and the tune.

[cis2711]

Did you ever alter you TPS situation at all? Did you stay with the 3-wire? Did you move any wires around at the ecu? 2L to 2M? Splice a 4th wire in anywhere? Thats the only thing I see missing here.

[vabreaker20011]

i ran the 3 wire til i swaped to MS.

car ran great

[MrNeuman]

Good wright up I used it alot for my egt turbo but i have found one thing that didnt work out.

You said to use an oil supply line for a 89 323 gtx usdm, so i got one from a mazda dealer, but i didnt fit. I had to order the correct one from corksport.

heres a picture of the differences


top one for the jdm 1.8 gtx and the bottom for the usdm 1.6 gtx

[redheddude222]

Good wright up I used it alot for my egt turbo but i have found one thing that didnt work out.

You said to use an oil supply line for a 89 323 gtx usdm, so i got one from a mazda dealer, but i didnt fit. I had to order the correct one from corksport.

heres a picture of the differences


top one for the jdm 1.8 gtx and the bottom for the usdm 1.6 gtx

I used the US GTX one and it fit perfect. I'm still using it now with my Subaru setup as well.

[Mazda_Powered]

which gtx redhed...lol, 1.6 or 1.8

[BuGS]

The 1.6l one works, just needs to be a little rebent... :D

[redheddude222]

which gtx redhed...lol, 1.6 or 1.8

The US only got the 1.6 GTX. It went on with no bending. Lined up perfectly right out of the baggie.

[MrNeuman]

well the usdm one didnt work out well and would of taken some changing and the jdm gtx fit like a glove, as you can see there clearly different

[Mazda_Powered]

some great info from Caymen91

VJ-20 outlet flange alternative with gasket

I used an exhaust flange then welded my pipe up.
Napa P/N:: 31926 $8.33. Fits just a bit tight around studs. Needed minimal filing on the outside edges of the stud holes to fit well.

The accompanying gasket is Napa P/N:: 31309

[wgnths]

btw I was pushing 16 PSI with my VJ20 on a stock motor with MS

[wgnths]

shoot now that i think about it I really cant remember correctly but my gut feeling says 16

[Mazda_Powered]

it could have been 16psi, but w/o a dyno its hard to tell if its making anymore power...but with MS you really never know, the VAF is a huuuuge restriction, and there was a youtube vid of someone running 250whp on a vj-20 running Halteck? and some other stuff, stock turbo tho...lol crazy.

[wgnths]

Ya I had it dyno'd and no VAF. It was a huge upgrade to go from VAF to MS. well worth it