Considering BPT swap need a little extra info

projectmx · Post by **projectmx** » August 5th, 2005, 10:05 pm

I am considering a bpt swap cause my car was totalled so i'm going to take a loan out to fix the car up and maybe do upgrades i found this:

BPT motor, 21x9x3 front mount intercooler, 5 2.5in alluminum U bends with 4 silicone cuplings. Apex-i S-AFC, 1st gen Eclipse Blow off valve, BP ECU, boost and air fuel gauges from Autometer with hardware, and a universal 3 pod pillar,

i know i need the bpt wire harness still but what else would i need.. if i use my current trans (i have a 94 1.6L DOHC currently) can i just keep using my current axles? can i even use my stock trans? i did a search but there is so much arguing and pages of unusable info that it was too hard to sort through and i need to make a decision soon... any advice would be helpful

projectmx · Post by **projectmx** » August 6th, 2005, 1:20 am

i will also be getting the wire harness thrown in for free.. but the person needs to know asap if i'm going to buy it.... so please if anyone can help me out let me know

atlantamx3 · Post by **atlantamx3** » August 6th, 2005, 10:31 am

Just spend the extra $$ and get the Protege Tranny/ Axles... that way, there are no questions.

projectmx · Post by **projectmx** » August 6th, 2005, 10:34 am

so with everything i have it should bolt up and run fine and using the bp harness and ecu will work ok with the bpt? and my trans and axles will work just fine but i should upgrade to the pro lx trans and axles?

D323 · Post by **D323** » August 6th, 2005, 12:52 pm

What do you mean by bpt?

Are you going to import a GTX motor and run it off of the NA BP ecu, or are you going to get a NA BP, then import the turbo parts you need?

Running a GTX motor off of a NA ecu is more difficult, and the wiring is more of a pain if you go that route.

projectmx · Post by **projectmx** » August 6th, 2005, 4:07 pm

that is what the guy is selling me he was going to do the swap then changed his mind and that is all that he has with it and first said 1200 then 1500 .... i won't pay more than 1200 though especially if i have to find an ecu and wireharness to make it run

ryanlindenberg · Post by **ryanlindenberg** » August 6th, 2005, 7:40 pm

if you are on a tight budget, don't do it. there are always lots of hidden costs, and if you don't spend the money to do it right there is no sense in doing it at all right?

projectmx · Post by **projectmx** » August 7th, 2005, 12:57 am

so i should just spend the money i have on my current engine? or other mods?

projectmx · Post by **projectmx** » August 7th, 2005, 10:34 am

i'm confused as to why the wiring if harder? from the posts i read if i use the wiring from a sohc mx-3 or a bp wire harness it is easier and if i can get my hands on a bpt ecu it will work just fine... and i thought the bp and bpt were the same except for the turbo itself and the turbo has no wiring so the harness should be exactly the same?

D323 · Post by **D323** » August 7th, 2005, 5:11 pm

mazda78 wrote:i'm confused as to why the wiring if harder? from the posts i read if i use the wiring from a sohc mx-3 or a bp wire harness it is easier and if i can get my hands on a bpt ecu it will work just fine... and i thought the bp and bpt were the same except for the turbo itself and the turbo has no wiring so the harness should be exactly the same?

of course ppl will tell you that. But here is the real answer:

1st off you have a Knock sensor on the GTX motor, and the ECU is looking for the knock sensor. You can either import a Knock controller (another expense hidden as ryan said) or try to find one from a turbo MX-6 (the older gen one). Now you have to deal with the extra wires for the VICS solenoid not found on the GTX. Not that big, but cut the wrong wire and your screwed. The NA BP/harness uses a 3 wire TPS plug. The GTX harness/GTX motor uses a 4 wire. You have to either rewire it, or source a TB from an A/T NA BP. The A/T NA bp uses the same 4 wire.

I could go on and on. Just thinking that its a simple plug up IS NOT wise. There are many little tidbit ppl leave out b/c details tend to fade as information passes from mouth to mouth.

I dont want you to think that I am a downer or trying to tell you not to do it, but I just want you to realize what all is involved, so you dont get ahead of yourself and end up wasting your money.

Trust me, I have done alot of homework on this. I am one of the crazy ppl out there taking an MX-3 GS and dropping in a BPT motor currently.

swalltr207jg · Post by **swalltr207jg** » August 11th, 2005, 11:49 am

also if your going to be running the bp ecu and harness, your also going to need something to adjust the timing if you wanna run more boost than the stock 9-10psi. this is because the NA bp ecu has more agressive timing and will cause detonation if you want to run more than 6-7psi boost, from what I've heard

D323 · Post by **D323** » August 11th, 2005, 4:29 pm

swalltr207jg wrote:also if your going to be running the bp ecu and harness, your also going to need something to adjust the timing if you wanna run more boost than the stock 9-10psi. this is because the NA bp ecu has more agressive timing and will cause detonation if you want to run more than 6-7psi boost, from what I've heard

good point; forgot about that. The DX SOHC ECU (SOHC=more retarded timing) is something to consider, but the lower rev limiter sux. Although the vj-20 stops flowing around that RPM anyways due to its small size. Then you also have to worry about VICS and is you want to just force the butterflies open all the time, or crack the intake manifold apart and remove the butterflies altogether.