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09-26-2013, 03:45 AM #91
The restrictor plate maybe refined down the road with velocity stacks, but for now it servers it's purpose trying to get the intake tuned in....
Dave, See post #79, alternator dead, horn was from low voltage warnings.
Currently working on a progressive style linkage that will or may cover the flat spots. Obviously there's a tremendous amount of air off idle, progressive linkage should move the TPS at (example) an approximate 2:1 ratio, so coming off idle almost instantly puts it into a mid range position.
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09-26-2013, 06:41 AM #92
gary, i wonder if it has something to do with the signal to the map sensor? have you put a ddt on it and checked to see what the reading is? someone also posted about going to crankcase injection, it probably can't be done w/ the stock ecu, the point in time of injection is different and i basically had to change my whole fuel curve from my first engine to get it all to work
action mobile marine, 772 528 0754, dealers for aces fuel products,wolf efi, pro marine,latham and gaffrig/livorsi. we build gearcases and modify them(3 litre) to ratchet, and powerheads as well. 21 skater/3 litre wolf efi 113 mph the engine build http://www.screamandfly.com/showthre...-3-litre-build
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09-26-2013, 07:05 AM #93
Morning Charlie,
MAP sensor checks out perfect on the DDT, matter of fact, I had 2 and checked them both. It's obvious that there's not enough fuel available when she comes off idle as felt by the stumble. After adding the restrictor plate, off idle response was much better (still not perfect) which proves my theory too much air/lack of fuel senerio. I'm going to run a vacuum signal to the EFI reg. to set if I'll gain enough psi to help cover the off idle bogg. It's all a work in progress......lol.
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09-26-2013, 07:21 AM #94
adding vacuum will drop the fuel pres at idle slitely. i just wonder if you have some kind of pulsation feeding the vac signal to the map. maybe put an inline restrictor in the vac line to the map sensor
action mobile marine, 772 528 0754, dealers for aces fuel products,wolf efi, pro marine,latham and gaffrig/livorsi. we build gearcases and modify them(3 litre) to ratchet, and powerheads as well. 21 skater/3 litre wolf efi 113 mph the engine build http://www.screamandfly.com/showthre...-3-litre-build
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09-26-2013, 07:34 AM #95
Charlie, please explain in detail on inline restrictor for MAP signal......
On the EFI reg. when vacuum port controlled.............when vacuum is applied (at idle) pressure is set to 42-44 PSI, once vacuum is reduced (throttle opens) the pressure builds up to 48-50 psi. That's the way mine works.
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09-26-2013, 09:16 AM #96
exactly, on the fuel pressure. as far as the restrictor imagine an inline double ended hose barb w/ a .010-.020 orifice in the center, that slows down/evens out the vacuum pulses that the map mite be seeing w/ that intake design.
action mobile marine, 772 528 0754, dealers for aces fuel products,wolf efi, pro marine,latham and gaffrig/livorsi. we build gearcases and modify them(3 litre) to ratchet, and powerheads as well. 21 skater/3 litre wolf efi 113 mph the engine build http://www.screamandfly.com/showthre...-3-litre-build
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09-26-2013, 09:36 AM #97
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09-26-2013, 10:27 AM #98
if you make that a T fitting in the MAP tube with a regulator valve
http://www.conrad.nl/ce/nl/product/2...er-Zeef-filter
( RC model fuel engines parts )
you could try to bleed in more air to the MAP sensor to get a richer mixture
bypassing the manifold vacuum
and retune the TPS for the richer mixture at idle
but it,s all just
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09-26-2013, 10:41 AM #99
Ronnie, I'll keep that in mind. As for tuning the TPS for a richer mix, that can only be done with a ratio change off the throttle. The TPS regardless of its position is recognized by the ECU at key up and that reading is what the ECU assumes is idle.
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09-26-2013, 07:22 PM #1001980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
RIP Stu
"So many idiots, so few bullets"
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10-01-2013, 04:22 AM #101
Going out testing today with the progressive ratio linkage and a spare MAP sensor w/a .020 restriction in it. Will try both but one at a time.
This video is a mock up for concept..........You'll notice on the lower linkage arm, a black dot on top, that's the OEM ratio position for the TPS (1 to1 ratio). With the modified lower linkage arm the ratio is increased where at 1/4 throttle, the TPS is tricked in to 50% output and at 1/2 throttle its already sensing WOT. The slide linkage had to be made to protect the TPS as with the ratio change theres more travel of the linkage than the TPS would allow.
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10-01-2013, 05:46 AM #102
looks very trick,that should work...................
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10-01-2013, 08:48 AM #103
Good luck.
Dave1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
RIP Stu
"So many idiots, so few bullets"
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10-01-2013, 11:40 AM #104
I'm back after my outing this morning...........................
And I'm happier than someone who just hit the lottery !!!!!!!!!!!!!
A perfect outing, it ran flawlessly, no bog, no flat spots, great idle in gear, instant acceleration, tons of mid range pull. Seems my little progressive linkage works............
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10-01-2013, 03:35 PM #105
Gary!!
That was a sweeeeet ride!! Way different than the first ride.....
way cool! That thing is well mannered and extremely driveable !!
Great job man!!
cant wait for the saturday shootout on ceasers.....see ya saturday buddy!