i routed the fuel return lines above the cam cover... and didn't reinstall the 2 lifting lugs. Now all bolts from the inlet manifolds are reachable with straight 1/4" extensions , no swivel magic needed ….one can even see them all ! Installed the manifolds ( new gaskests and liquid gasket sealer ) in 1 hour ! Only the 2 x 2 nuts were the cast horizontal connections are in the manifolds needed a grinded down socket and a wobble extension, but one has a clear view on those....and can start the nut with a finger . This was fun comparing to demount it with the oem return line in the way . I'm sure i can demount it now in 1/2 hour . No more fear for those manifolds !
Had to end the evening job as i damaged 1 O ring mounting the injectors in the fuel rail ... and i have no spare. Tomorrow to the shop....
With a bit of luck car is running again tomorrow.
i finally did a dyno again ... ( had to prep the E9 for a rally next week ) .
Again same results , but we filmed the boost gauge straight to have a exact measure.
We don't have the "bug" , i have seen the throttles going 90° open and stay there. ( visual with a stick on the throttle taped)
At 4876 rpm we have max 416 HP at 0.3 bar boost . After that it stays "flat" till 6000 rpm , but boost go's higher to 0.4 bar .
At 4585 rpm we have 616 NM
Boost gauge is connected on the manifold ( T on the FPR hose) , so after throttle .
I'm running now crankshaft dia 155 mm , charger 52.5 mm , so x 2.95 … just below max revs for the Raptor V ( would be x 3)
Is this ignition related ? from 4876 rpm till 6000 he get's 0.1 bar more boost but doesn't do anything with it … HP stays "flat"....
Its very strange to me, if boost is going up and AFR stays 11 to 12.5 range the HP has to rise makes no sense that it doesn't.
Only way it would stay flat if injectors are maxed out and AFR goes lean...
no Ed , AFR stays 11...12.5 , injectors are 300 cc ( 30 lb) , new fuel pump unit / new filters , 98 octane fuel.
Perhaps timing ? and why should it take advance away ? any sensor (we have no knock sensor) that can do that ? mapping ?
NGK BKR6EK ( 2288) ( also new plugs.... )
can it be OK up to 4700 rpm and drop power above, due compression ? here are the curves from yesterday : (values x 0.75 as we only drive 3 sets rolls instead of the 4 )
BMW 850i - downpipes - NM.pdfBMW 850i - downpipes - PK.pdf
cam timing is off
'91 Dinan 860 Stage III (new 6L engine)
'91 Dinan 850 TT stage III (brand new engine) 21st Century Tech meets 18th Century Dinan...
'91 850i 6sp (mint) (sold)
'90 Dinan 750iL TT stage III (Guido - The Beast)
'94 850 CSi The Detroit Auto Show car (restored to factory perfect) (sold)
'96 850Ci, The George Carlin car
''73 3.0 csi, '08 535i, '03 X5 4.6is
...and a few other non BMW cars
i timed the cams a few weeks ago cartoonz..... they are spot on.
https://www.bimmerforums.com/forum/s...ith-water-leak
Last edited by Belgiumbarry; 02-09-2019 at 03:24 AM.
A thought, Boost pressure could be going up but if the heads are the bottleneck HP will remain flat because the air is just backing up. Of course you would need to pull the heads and flow test them and then port and polish etc to see any potential gains.
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