a ccommon turbo build on a non common car

[danval]

First of all thanks for your help. A lot of my questions have been answered and very knowledgeable people. Plus ive purchased a couple things from this forum. So here it goes. I recently got a 1975 530i (e12) it was was an auto, so i decided to do a swap. A 2.7i turboed was the choice, plus the 5 speed. Ill post some pics and thanks again.

[jaywood]

In for pics

[danval]

First ones

[danval]

Couple more

[codrum]

Looks like an awesome project. Keep us updated on your progress.

[danval]

Looks like an awesome project. Keep us updated on your progress.

Thanks a lot. I sure will. The swap swap alone was a bitch and a half!

[danval]

Ok, so i got all the little gremlins out of my wiring system. It was a bitch to figure out the merging of the two wiring harnesses. But its done. Now that it starts, and runs good, im ready to throw in the turbo kit.
I want to make sure im not missing anything.
Ive been through some turbo builds in the forum and i hope im covering everything. So here it goes:
Turbo manifold and turbo
10Psi waste gate
Aerotive 1:1boost reference fuel pressure regulator
Oil catch can (from valve cover)
Oil turbo feed
My tunner friend is making me a "turbo friendly" chip (timing)
Intercooler
Aem wideband
Blow off valve
#42 injectors
Secondary 255lph walbro pump fed by swirl pot (surge tank)
All AN plumbing.

If im not mistaken, the tunning part goes off of checking refference frome wideband, a/f ratio and adjusting air box, does anybody has a more detailed way or refference on how to adjust the air box? Thanks and let me know if im missing something

[Q5Quint]

Ive tried to type a reply twice and the board wont let me :'-(

Edit: there we go

Your boost timing will be the chip, so it will be incredibly retarded for off-boost part throttle timing.

Your part throttle and idle fuel 'tuning' will be done by the chip (turning the fueling down 1/2, if your injectors are 2x the size of stock) and the air flapper (where on the ecu fuel map the air flow is.)

You boost fueling will be a mix of the chip fuel bins and the fpr. The air flapper will obviously pin itself wide open at this point, so use the wot fueling bin.

If you have stock fueling at 4krpm, and you up your fuel pressure 5:1 with a rrfpr to 90psi (I think your fuel pumps can handle that, can they?) you will now be getting 60lb out of your 42lb injectors. You may have to do a trick where your car will normally flood itself after 4000krpm unless it is in boost, in which case it will not be running lean.

Think about it. if your stock injector was opening 100% at 6000rpm to 17lbs of flow for say... 5ms, your 42lb injector is only opening about 1/2 the time, say 2.5ms, to get the same fuel in there. Now you are upping the fuel pressure to try and squeeze nearly 2x the fuel out of it in the same 2.5ms. Possible? Sort of yes.

You will be adjusting the air box and using a modified chip fuel map to make it idle not horribly with giant injectors. You will adjust the fuel pressure regulator to make it not explode under boost, since that is the only thing in your car that actually responds to what 'boost' is. Your ecu doesn't know if it is a wot and 0psi or wot and 20psi, but the flapper and tps is telling it that it is at wot.

Set your fpr at 2 or 3:1 so you get an extra 30% fuel at 6k. Watch your o2 sensor carefully to make sure you are not running lean and melting everything. You have a wideband listed up there so it will help log this for you and allow you to tune up or down the fuel pressure regulator. Once that is set you may notice you are lean at part boost and super rich at full boost. Get your chip guy to modify the wide open throttle bins a bit to fix this.

[danval]

Ive tried to type a reply twice and the board wont let me :'-(

Edit: there we go

Your boost timing will be the chip, so it will be incredibly retarded for off-boost part throttle timing.

Your part throttle and idle fuel 'tuning' will be done by the chip (turning the fueling down 1/2, if your injectors are 2x the size of stock) and the air flapper (where on the ecu fuel map the air flow is.)

You boost fueling will be a mix of the chip fuel bins and the fpr. The air flapper will obviously pin itself wide open at this point, so use the wot fueling bin.

If you have stock fueling at 4krpm, and you up your fuel pressure 5:1 with a rrfpr to 90psi (I think your fuel pumps can handle that, can they?) you will now be getting 60lb out of your 42lb injectors. You may have to do a trick where your car will normally flood itself after 4000krpm unless it is in boost, in which case it will not be running lean.

Think about it. if your stock injector was opening 100% at 6000rpm to 17lbs of flow for say... 5ms, your 42lb injector is only opening about 1/2 the time, say 2.5ms, to get the same fuel in there. Now you are upping the fuel pressure to try and squeeze nearly 2x the fuel out of it in the same 2.5ms. Possible? Sort of yes.

You will be adjusting the air box and using a modified chip fuel map to make it idle not horribly with giant injectors. You will adjust the fuel pressure regulator to make it not explode under boost, since that is the only thing in your car that actually responds to what 'boost' is. Your ecu doesn't know if it is a wot and 0psi or wot and 20psi, but the flapper and tps is telling it that it is at wot.

Set your fpr at 2 or 3:1 so you get an extra 30% fuel at 6k. Watch your o2 sensor carefully to make sure you are not running lean and melting everything. You have a wideband listed up there so it will help log this for you and allow you to tune up or down the fuel pressure regulator. Once that is set you may notice you are lean at part boost and super rich at full boost. Get your chip guy to modify the wide open throttle bins a bit to fix this.

dude, thanks a lot! I. Going to drive the car for a little so ill get all the gremlis out before i install the kit in it. Ill let you know how it goes and thanks again brotha