EFI straight eight Buick

[SPARKY]

How cool is that     It would be intresting  if one could slow motion what was going on inside of the intake manifold

[GH]

Mike called me yesterday and said he drove the Buick down the road and everything worked great. He said it runs real smooth up to 3000 rpm, then it gets a little ragged. We are going to Omaha Nebraska this coming Friday to run it on the dyno, Dieselgeek will tune it.

[SPARKY]

BEST of luck on the dyno---hope you get some great numbers

[dieselgeek]

Mike called me yesterday and said he drove the Buick down the road and everything worked great. He said it runs real smooth up to 3000 rpm, then it gets a little ragged. We are going to Omaha Nebraska this coming Friday to run it on the dyno, Dieselgeek will tune it.

that makes sense.  Last time we ran it, we were tuning it on gasoline and I made it up to about 2700rpm before she let go.  Should only need 1 or 2 pulls to sort it out this time...  can't wait for you guys to get up here, dyno visits from Gary and Mike have become a good vacation for me.  Mainly because they're the only "car guys" that my wife likes!!   

[Milwaukee Midget]

Good luck this weekend.  No more heartaches - only big numbers! 

Another video, perhaps?

Chris

[dieselgeek]

We'll take video for sure,

-Scott

[GH]

The dyno session went fairly well. We are still having fuel distribution issues. We made 300 hp and 420 ft lbs of torque @ 4000 rpm. This is the highest rpm we were able to tune due to the fuel issues. The good news is, we brought it home all in one piece.

[Stan Back]

That's a gob of torque!  Have you any idea of the amount of twist from end to end of that super-long crank at 3000 RPM?  I've heard some crazy figures.

Stan

[SPARKY]

I vote for Injectors in the individual intake tubes to "trim" each cyl.  might be easy to boost register them.

[Milwaukee Midget]

I vote for Injectors in the individual intake tubes to "trim" each cyl.  might be easy to boost register them.

There's the rub - trimming each cylinder on shared intake ports.  But looking back at this build, maybe that might be an approach - use the TB injectors as the "main course" and tweak the intakes to keep the burn consistent between cylinders.  O2 sensors on each exhaust for feedback to the ECU?   Kinda thinking out loud . . .

What are your spark plugs looking like after this excursion? 

Either way, great progress, guys.

[dieselgeek]

That's a gob of torque!  Have you any idea of the amount of twist from end to end of that super-long crank at 3000 RPM?  I've heard some crazy figures.

Stan

Our mustang dyno is "LOTS" lower reading than all the non-SAE dynos out there.  To give you an idea, on a superflow engine dyno this engine would show to 500+ ft-lbs of torque.   It's definitely making big power for what it is!!


Back 4 cylinders showed average AFR exactly 2 points leaner than the front 4.  Once we figured out what was happening, it was easy to make it run clean - just a little concerned about the back four jugs being in the 14s AFR at WOT and 12psi though.

[GH]

Mike purchased an LM-2, wideband oxygen sensor with 2 sensors. We have the air-fuel ratio pretty close through about 3000 rpm. So, we are headed back to Ohmaha this Sunday to put the finish tune on it.

[Milwaukee Midget]

Gary

Good luck this weekend.  Don't use it all up on the dyno -  save some for the salt!

Of course, we'd all LOVE to see some video from the dyno - if you can make the time.

Chris

[dieselgeek]

I vote for Injectors in the individual intake tubes to "trim" each cyl.  might be easy to boost register them.

Sparky, we're grouping the injectors into two "banks" then tuning each individually.  His megasquirt allows dual VE table tuning so, two separate sets of tables for each bank.

He needs maybe 10% more fuel in one bank than the other.   So, not individual cylinder trim but, close.  Hopefully it works!  At least for this year, so we can get the boys started on that Turbo setup for next season...  

[dieselgeek]

Mission accomplished!!  The guys are on their way home this morning with a tuned and running XXO !

All 8 plugs come out looking the same too.   Mike's "supplemental injector" idea worked out pretty good.   Be sure to take a look at it on the salt this year - coilpacks, custom crank trigger, upgraded blower making 12psi, and runs like a champ!