M20 B3x Naturally Aspirated Stroker build past, present and future

[digger]

Nice work digger, glad to see some progress.

Has the new engine been dyno tuned yet ?!

i have to build it first ha, ive been busy and out of the country for a few months.......

[LJ851]

Nice work digger, glad to see some progress.

Has the new engine been dyno tuned yet ?!

[digger]

next task is relocating the catch can to under the airbox (currently its just infront of washer reservoir) and routing the valve cover breather to the new location. i need the old spot for something else.... ;)

[digger]

I designed this vacuum rail to mainly use Closed Loop Idle Control which is important for cold start (mine never starts properly without it, now it starts better than OEM) and fast warmup, the intention was to make things neat and tidy compared to the monstrosity i have been using. Its 20 x 20 x 1.5 mm hollow aluminium tube with a cap at each end. has tapped bosses with M6 threaded 6mm nipple for each runner and another for the FPR which has a t-piece for using a vacuum gauge or running to the ECU internal map sensor (currently T-piece is capped off as im using ALPHA-N). its basically a similar design to the fuel rail



made the parts and had a guy i know with a TIG weld the bits together





some pics of it fitted. it cleans up the bay alot. there is a fitting on the bottom of the airbox that fits into the open hose. i convrted to the L-shaped ICV in the process.

hoses for runner 1 and 2 feed between runner 1 and 2 to avoid fouling with linkage, similar for 3-4 and 5-6





here is what i replaced (used to sit under where the rail is now, note that the actual hoses i used with the old system were about 12" longer than shown as they need to be the same length, i cut the old ones and reused them. there were hoses all over the place but now the hoses are only 8" long vs 24" previously and its all tucked away



seems successful, idle is the same so no adjustments required which is good

[fporro]

So much refinement Digger, I'm digging it ;)

[raudonis]

I can't for the life of me find where to get the 45mm valves. Is there any way I could ask you to point me in the right direction to get a set of those?

http://www.r3vlimited.com/board/showthread.php?t=247378

[Bimmer_man]

I can't for the life of me find where to get the 45mm valves. Is there any way I could ask you to point me in the right direction to get a set of those?

[digger]

thanks guys. yeah mine is tuned with O2 up the tailpipes. i have two ports in the Merge and one is still free and the ohter for the WB. so may get them to tune with it as it is precat which is supposed to be better

[ForcedFirebird]

nice car mate

http://i110.photobucket.com/albums/n120/diggerdigger/P1000489-Copy_zps53d44679.jpg

I see your lambda sensor is very far from engine as It is on my car, does you have issues with sensor working propertly, or it works fine?

Won't bother it being that far. When we tune cars on the syno, the wide band is clipped to the tail pipe. I have noticed it causes the AFR reading to be about 300rpm off when making adjustments.

[abit]

nice car mate

http://i110.photobucket.com/albums/n120/diggerdigger/P1000489-Copy_zps53d44679.jpg

I see your lambda sensor is very far from engine as It is on my car, does you have issues with sensor working propertly, or it works fine?

[2mAn]

Car looks great :up:

x2.

This whole thing has me wanting to do some major research before I build a better exhaust system for my car.

Love this thread.

[tinkerputzer]

Car looks great :up:

[digger]

had a few issues shall we say that have been keeping me busy. here are a couple happy snaps

[The Dark Side of Will]

Wow, I wouldn't have expected x-pipe placement to make such a difference.

Correct collector length and termination is extremely important. Since an X-pipe creates an impedance change that terminates the collector, X-pipe placement determines collector length and as such can have a very significant impact.

[nando]

Its all stock parts except for pistons, the life of the engine isn'treally affected.