GTO resto mod update

[simpleman68]

Post 7 for progress pics

I haven't posted much the last year or so. Car is done except for some interior work and a paint job.

Working out the final bugs and trying to figure out why it is backfiring/stumbling at WOT in the 3500 rpm range.

Making excellent power with a conservative tune. I told tuner I didn't want to throw a bunch of timing at it and want an NA cruiser that can handle runs on 100 degree days.

Made 565 rwh on 91 octane in an 80 degree shop.
Scott

YouTube (Short URL)

[JRD77VET]

That sounds SWEET

[Grey Ghost]

What type and brand of injection?

[mrvette]

Long about '92 or so I finished putting DPFI on my '70 Lemans/GTO 462" engine, 400 auto, 321? posi, disk brakes, convertible, and so it got published in Feb '95 issue of High Perf Pontiac Magazine.....I took a complete system off a Caddy large engine from '79 in a local junkyard.....

I used it to tow a ~25' boat over the Appalachian mountains to the upper stretch of the Potomac River near W. Va. ten miles of wide river to a dam built by Geo. Washington, obviously a national park......I used to pass cars going up a rather steep L O N G pull to mountain top, topping 100 mph at the crest sign and the warning that the long pull was over with so everybody LIFT off the gas pedal......so at the crest I was doing only 55 or so, take the first exit after that and into the park.....needless to say, the return trip was considerably slower.....

[simpleman68]

Originally Posted by Grey Ghost

What type and brand of injection?

60 lb/hr injectors, not sure which company. This is a turn key, sleeved LS7 from TX Speed. (Their 675 hp long block)

We replaced every wire, line etc in the entire car, all the way to a new fuse panel.
Scott

[mrvette]

Originally Posted by simpleman68

60 lb/hr injectors, not sure which company. This is a turn key, sleeved LS7 from TX Speed. (Their 675 hp long block)

We replaced every wire, line etc in the entire car, all the way to a new fuse panel.
Scott

SIXTY lb/hr injectors??? why bother to have them?? may as well just let a little hole piss down the chute...

[simpleman68]

Some cool pics of the project.

QA1 Suspension and Wilwood disc brakes installed and ready for test fitting the new powerplant





New crate from TX Speed



T56 Super Mag bolted up for fitment



Notched a little off the cradle to get it all to fit and sit as low as possible.



New Moser M9 rear with 3.73s and a new stainless 30 gal fuel tank.
I can do ~550 highway miles on a full tank of gas.

[simpleman68]

Originally Posted by mrvette

SIXTY lb/hr injectors??? why bother to have them?? may as well just let a little hole piss down the chute...

60 lbs will push 800 hp all day long and still not get much beyond 75% duty cycle.
Too much injector screws with power down low and can muck up spark plugs.

Scott

[04 commemorative]

[Strats-N-Vettes]

Originally Posted by simpleman68

60 lbs will push 800 hp all day long and still not get much beyond 75% duty cycle.
Too much injector screws with power down low and can muck up spark plugs.

Scott

Where does the computer say your stumble is located (fuel or spark)?

[mrvette]

Originally Posted by simpleman68

60 lbs will push 800 hp all day long and still not get much beyond 75% duty cycle.
Too much injector screws with power down low and can muck up spark plugs.

Scott

I no that, I jest messing with you......DAMN NICE project there, if I had bux and was ~25 years younger, I"d have my own similar project.....

[simpleman68]

Originally Posted by Strats-N-Vettes

Where does the computer say your stumble is located (fuel or spark)?

That's what I'm waiting to hear. The builder is puzzled and this guy is one of the best LS mechanics on the East coast and been building/modding these since they came out. Also a 25+ yr GM master tech.
Got us all scratching our heads.

Tuner was called in a 2nd time to review files and all looks good to him.
Scott

[Onebadcad]

Nice car, good luck on budget--mine always gets destroyed.
Nice C6Z in the background.

Post up a sound clip when she is tuned and road ready!!

[simpleman68]

Originally Posted by Onebadcad

Nice car, good luck on budget--mine always gets destroyed.
Nice C6Z in the background.

Post up a sound clip when she is tuned and road ready!!

Vid in the original post and this is a vid of it at idle.
Scott

[GTOguy]

$$$$$$. Damn that is one sweet looking car. I don't care who you are, the '67 GTO and the '68 Charfger are the two best looking musclecars ever produced. At least in my opinion. Very nice, Sir!

[Dan Dlabay]

Always liked the looks of the 60's GTO's. Good looking car.

[Onebadcad]

Originally Posted by GTOguy

$$$$$$. Damn that is one sweet looking car. I don't care who you are, the '67 GTO and the '68 Charfger are the two best looking musclecars ever produced. At least in my opinion. Very nice, Sir!

You better throw a Ford in there, as I know a dood that says The Boss 1971 351 Cleveland is deserving.

[GTOguy]

Originally Posted by Onebadcad

You better throw a Ford in there, as I know a dood that says The Boss 1971 351 Cleveland is deserving.

The Torino-based '71-'73 Mustangs are the biggest, ugliest Mustangs ever, IMO.
I love fords, but I like '64 Comets, '65-'66 Mustang Fastbacks, and '61-'66 Galaxies. But none have the lines of the '67 GTO.

[mrvette]

Originally Posted by GTOguy

The Torino-based '71-'73 Mustangs are the biggest, ugliest Mustangs ever, IMO.
I love fords, but I like '64 Comets, '65-'66 Mustang Fastbacks, and '61-'66 Galaxies. But none have the lines of the '67 GTO.

Has to have a rag top before I would have to steal it.......

[Egnalf]

damn nice project. any chance its overfeeding fuel at the lower end?