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good idle now.18 inches of vacuum. Bad top plate gasket install by me. had vacuum leak. all good now. set throttle control sensor. would like to have a better understanding of how it functions. balanced TB's at idle. did a couple of rolling starts. seems a little boggy, but it spun the tires. never did that before. think the loud exhaust is throwing me off. need to check for exhaust backpressure and check the fuel ratio. just starting the tuning phase. may need a programable ecm. haven't taken on the road yet. rpm range will be a little different. success for today. good idle and vacuum. one step at a time. this is the first time this car doesn't have any fluid leaks.
finally took muffler off and this is the design. loudest muffler I have ever had. made 4 inserts for outlets. this helps. still to loud. these mufflers would be great for the track. they sound good ,but to loud for me.
did the research on how to set tps and synchronizing TB's. made some loose wires with male plug on one side and alligator clip on other side to test tps.
synchronized TB's with manometer. there are many videos online showing process. basically, the driver's side idle screw is for setting idle and the welded screw on linkage is for balancing.
car idles at 600 rpm's now with a hint of a cam. not a dead smooth idle. not being satisfied with standard procedure. made a duct tape special. already had flow meter. wanted to check sync at part throttle. I can see myself experimenting with this. this flow meter showed that the manometer was a little off.
Mmmmm...That looks like a pretty familiar device. I guess I wasn't so crazy after all.
I'm guessing, this isn't a new idea. Been using flow meter for over 40 years. old tech. truth is manometer works fine. I was trying to confirm the manometer readings. it's within .05 inches WG. splitting hairs. I must be crazy. there must be newer tech now. some kind of probe or cfm gauge. in the end it won't really matter. close enough is most likely good enough.
finish up exhaust next week and this project will be done. Had fun sharing my journey. learned a ton. 2 steps back and one step forward. need to drive car now.
in retrospect, could have max ported intake manifold using sonic tester 225 cfm and went with a little bigger cam, but I went conservative. I believe that max porting would need bored out TB's and programable computer. might still get programable computer. time will tell.
specs for engine
intake manifold 215cfm average.
heads 250 cfm intake and 196 cfm exhaust
9.44 compression, dynamic compression ratio is 7.82. have adjustable cam gears if I want to play with that.
camshaft 266- 270 advertised 213-217 @ .05 112 lobe separation. idle is good. 600 rpm. hint of having a cam.
I can understand why people get frustrated with crossfire injection. the whole system was designed for 205hp. choked intake, choked exhaust and limited head flow.
intake can be ported, free flowing exhaust can be added, higher flowing heads can be added, bigger cam can be added, bigger tb's can be added, but it doesn't end there. with mods it will need more fuel. need to block off tb's fuel pressure regulator and install external fuel pressure regulator with vacuum port. have to calculate fuel needed. TBI Fueling (dynamicefi.com). I could only find 2 choices for fuel injectors, stock 67#/68# @ 11/12 psi or 81#@ 13psi. 81# requires parallel plumbing the fuel lines. using TBI fueling to calculate the injector size and psi needed. I'm sure this has all been done before, but its new to me. think I'm going to parallel plumb mine.
exhaust is quiet enough now. exhaust system is all 2.5" now. added resonators before mufflers. now for the injector size and fuel pressure needs to be sorted out. probably add an O2 gauge to monitor afr in real time. there are people on this forum that have proven that crossfire can make HP. maybe someone could write a book on how to do it. step by step manual.
fuel lines are parallel plumbed now. use copper nickel hard lines.
have a 0-30 psi inline gauge now. Added air fuel ratio gauge. good thing I haven't driven the car yet, because its running lean. so getting afr correct is the next problem. I don't think there a vacuum leak, because there is good vacuum. I will check for vacuum leaks. I think it's the computer tune. I'll check everything else first. keep plugging along
checked for vacuum leak, there was some. fixed vacuum leaks, old rubber hoses, but I don't believe that is the lean condition cause. I believe I need programable ecm. with all the changes that were make, the stock ecm makes car run lean. time to get programable ecm.
still not there.
with stock ECM engine was running very lean. installed Dynamic EFI-EBL FLASH 11 EMC today, lean condition gone. still needs some tuning, but good enough to drive.
now I can start tuning.
03-16-2024, 05:55 PM
