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gumba's Avatar
 
Join Date: Dec 2001
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Retard timing under boost?

Looking at map sensors for the xdi got me wondering.
My 3.5 uses a Bosch 12 plug distributor with no obvious advance/retard ports. How does the timing get retarded under boost, or does it?

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Harold
'79 930/DP935
'68 VW 3.3 Turbo Crewcab
Old 05-13-2018, 01:10 PM
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Not familiar with xdi but yes you want to pull boost at the onset of boost and then add it back in
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88 930 3.4 ,Twin plugged billet Xtreme cylinder heads and denso COPs, Dougherty custom GT 2 evo cams,pauter rods,Garrett Gt40,ms3x Efi ,1100cc injectors,extrude honed 3.2 intake,TK billet fullbay I/C,MODE headers,KEP stage 2, E-85, 706 rwhp
Old 05-13-2018, 03:35 PM
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xbmwguy,

Are you tuned to run lower boost at lower RPM's when boost comes in and then increasing the boost level with increasing RPM's? Is MS3X controlling your boost? Just curious about this approach.
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1977 930 Slant, MS3 EFI, Carrera intake, Twin plug, Powerhaus headers, Magnaflow muffler, Garretson intercooler, GTX3071R
Old 05-13-2018, 05:06 PM
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sorry for the confusion, my question is how it the timing retarded with a distributor with no advance/retard ports.
The xdi on the other motor is set up with a 1 bar map sensor.
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Harold
'79 930/DP935
'68 VW 3.3 Turbo Crewcab
Old 05-13-2018, 05:24 PM
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Ms3 is controlling boost via the ebc. Itís in open loop and Iím actually tuned on he ebc tonallow MORE pressure at the lower rpm to allow a quicker boost Onstar then pulling boost as the rpms rise to a number I want to run ie 16 lbs or 20 lbs or higher
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88 930 3.4 ,Twin plugged billet Xtreme cylinder heads and denso COPs, Dougherty custom GT 2 evo cams,pauter rods,Garrett Gt40,ms3x Efi ,1100cc injectors,extrude honed 3.2 intake,TK billet fullbay I/C,MODE headers,KEP stage 2, E-85, 706 rwhp
Old 05-13-2018, 05:39 PM
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This auto correct crap needs to be turned off

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88 930 3.4 ,Twin plugged billet Xtreme cylinder heads and denso COPs, Dougherty custom GT 2 evo cams,pauter rods,Garrett Gt40,ms3x Efi ,1100cc injectors,extrude honed 3.2 intake,TK billet fullbay I/C,MODE headers,KEP stage 2, E-85, 706 rwhp
Old 05-13-2018, 05:40 PM
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