Who supplied the rear wing kit?
Red Headed Stepchild-75 Swinger LSX Swap
- Thread starter YoungDart75
- Start date
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YoungDart75
Well-Known Member
The rear wing I had made from scratch by Bryan Fondren on North Carolina since no one offered a body width one for the 75. I didn't like any of the trunk width spoilers.
Sounds wicked. Caint wait to see how it runs!
YoungDart75
Well-Known Member
Dyno day in the books. Had a few small things I had to fix while jt was on there. Air bubble in the a2w suction line which caused it not to pump. Simply disconnected and drain for a few second and hooked it back up and it cleared it.
I misread the wiring on the pump and only wired it for low pressure. Found the issue as fuel pressure started to drop off after getting into boost. Put power to the yellow wire and we had full speed/pressure on the pump. Then toward she end we kept losing cam/crank synchronization causing it to abort some runs. On the final pull it lost sync and backfired a little but. Nothing harmful to the motor just the safety in the ecm doing its job. But it also took the o2 sensor with the percussion.
Other than those issues it was successful. Drove it uo there switched it over to e85, did pulls throughout the day and drove it on the trailer after. Win win.
5.5 psi she made 640whp
10psi she made 750whp
16 psi she made 913whp
20psi she made 1000whp which is where we stopped for the day.
After being bout fed up with the struts on the back a friend of mine and I got to work on fibbing up these new strutless mounts for the wing and they came out great and fit perfect. Even with only one bolt in and no rivets, I could lift the trunk open by the wing and have no flex. I do have to get actual satin paint as I grabbed the wrong can. But they'll be painted to match the wing before I rivet them down.
I misread the wiring on the pump and only wired it for low pressure. Found the issue as fuel pressure started to drop off after getting into boost. Put power to the yellow wire and we had full speed/pressure on the pump. Then toward she end we kept losing cam/crank synchronization causing it to abort some runs. On the final pull it lost sync and backfired a little but. Nothing harmful to the motor just the safety in the ecm doing its job. But it also took the o2 sensor with the percussion.
Other than those issues it was successful. Drove it uo there switched it over to e85, did pulls throughout the day and drove it on the trailer after. Win win.
5.5 psi she made 640whp
10psi she made 750whp
16 psi she made 913whp
20psi she made 1000whp which is where we stopped for the day.
After being bout fed up with the struts on the back a friend of mine and I got to work on fibbing up these new strutless mounts for the wing and they came out great and fit perfect. Even with only one bolt in and no rivets, I could lift the trunk open by the wing and have no flex. I do have to get actual satin paint as I grabbed the wrong can. But they'll be painted to match the wing before I rivet them down.
H8z2luze
Well-Known Member
Such a cool car. Definitely crossed my mind to LS swap my Duster but I didn't want to watch out for Mopar guys lurking in the shadows with a knife.
YoungDart75
Well-Known Member
I run it whereever I can if the track holds if im in a competitive race. but I will probably start out with keeping it at 20 psi I know im at a good surface and then add some more. I want to see how it performs down track on this new setup.
Converter seemed to be struggling and hold back power after that 16psi mark. So I may have tk start a go fund me to get one of those nice bolt together circle d converters. Lol. They're better for 800 to 2000hp.
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YoungDart75
Well-Known Member
The strutsless mounts are done and done. Very happy with how they turned out and how strong they are. Gonna make life a lot easier between rounds.
YoungDart75
Well-Known Member
The garbage weather in the Pacific Northwest cleared for a few hours today and I was finally able to go for a drive around town.
TT5.9mag
Two atmospheres are better than one
How’s the new engine? Running good? And have you had a chance to test the new wastegates?
edited to add;
Sorry I forgot about the dyno day you already did. So my questions have already been answered. Duh
edited to add;
Sorry I forgot about the dyno day you already did. So my questions have already been answered. Duh
YoungDart75
Well-Known Member
Way to go guy. Real question is how is big blue?
YoungDart75
Well-Known Member
Nothing crazy this weekend. Wired up the windshield wiper motor because #streetcar and because #pacificnorthwest.
YoungDart75
Well-Known Member
Well I took her out for a drove the other night and the alternator died leaving me stranded.
Trailered her back. Pulled the alternator and went and got it tested to make sure and then purchased a new one today.
While doing that I had a leak at the timing cover seal during the dyno. No big deal easy swap I thought. If you remember back
when i got the motor it was a complete long kick minus intake and oil pan.
Well that lead into my discovery of today. While assembling it, they didn't pay specific attention to the crankshaft dowel when installing the pulley. It shifted to the rear and vertical rather tha. Staying flat like it should have. In doing so it cut its own groove into the ati balancer while they were torqueing it down. So I had to clean it up and repair before reinstalling after putting the new seal in and pulley. New alternator is in and the new 02 sensor that **** the bed is on the way as well. Should be here tomorrow. New oem GM crank sensor is installed as well since I was having the weird signal sync error on the dyno as long ad everytbig shows up on time I'll be testing Saturday.
Also got some 4 inch stress balls to fill in the belcoity stacks for when I start hitting car shows. Don't need any little kids dropping things in there.
Trailered her back. Pulled the alternator and went and got it tested to make sure and then purchased a new one today.
While doing that I had a leak at the timing cover seal during the dyno. No big deal easy swap I thought. If you remember back
when i got the motor it was a complete long kick minus intake and oil pan.
Well that lead into my discovery of today. While assembling it, they didn't pay specific attention to the crankshaft dowel when installing the pulley. It shifted to the rear and vertical rather tha. Staying flat like it should have. In doing so it cut its own groove into the ati balancer while they were torqueing it down. So I had to clean it up and repair before reinstalling after putting the new seal in and pulley. New alternator is in and the new 02 sensor that **** the bed is on the way as well. Should be here tomorrow. New oem GM crank sensor is installed as well since I was having the weird signal sync error on the dyno as long ad everytbig shows up on time I'll be testing Saturday.
Also got some 4 inch stress balls to fill in the belcoity stacks for when I start hitting car shows. Don't need any little kids dropping things in there.
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Jeff Seighman
aka jeffnmo
Good thing that oil leak showed up! Keep up the awesome work, I really like that Dart.
YoungDart75
Well-Known Member
Yeah, i have it reinstalled for now, i don't doubt it ill work fine, and i guarantee its on there properly now. But i sent pictures and info to ATI anyway to see if they think its strong enough to hold up as is or if they think it'll split after some spirited driving eventually. It help up fine on the dyno for all those beatings so we will see what they say.
UPDATE: they said don't race it that way, so ill have to pickup just the hub portion of the balancer seeing as its a 2 piece pulley.
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In my ongoing continued education program to expand my horizons, I stumbled upon this YouTube video that covers the history of the Small Block Chevy with the majority of focus on the LSx engines. They were truly a remarkable engineering achievement:
YoungDart75
Well-Known Member
They work extremely well and the price point is right on par for anyone who is starting out in hotrodding. Especially with the backwards compatibility for transmissions.
Forgive my LS ignorance, but is 20PSI an actually safe number? No worries about blowin it all to hell and back? And those dyno numbers are badass!
YoungDart75
Well-Known Member
It's been a little while with Independence Day and everything. Was troubleshooting some issue on the car and made some progress. My new hub for the ati balancer just got here so I'll be swapping that out soon.
Also had the Sultan shindig the last two days and capped it off with the show n shine car show today. Cleaned the Dart up and drove down with a neighbor of mine with a root beer brown gbody and a friend with a big single 94mm fbody met us there as well.
Ended being the perfect day for it westher wise. Didn't get too warm till later on in the day snd the police left me alone while driving with the parachute still on.
I ended up being lucky enough to come home with 2nd place in the hotrod group. With all the bad rides out there I wasn't expecting that one. But I'll take it.
Now it's time to swap over that hub, get some more e85, and get ready for a show I'm driving it to next weekend. After that it's time to go over the tune and get ready for a track rental on July 20th at Pacific raceway.
Also had the Sultan shindig the last two days and capped it off with the show n shine car show today. Cleaned the Dart up and drove down with a neighbor of mine with a root beer brown gbody and a friend with a big single 94mm fbody met us there as well.
Ended being the perfect day for it westher wise. Didn't get too warm till later on in the day snd the police left me alone while driving with the parachute still on.
I ended up being lucky enough to come home with 2nd place in the hotrod group. With all the bad rides out there I wasn't expecting that one. But I'll take it.
Now it's time to swap over that hub, get some more e85, and get ready for a show I'm driving it to next weekend. After that it's time to go over the tune and get ready for a track rental on July 20th at Pacific raceway.
YoungDart75
Well-Known Member
20 psi is perfectly fine on an LS, even for a stock bottom end never been apart engine. A lot of times people will drop the pistons out and regap the rings for boost and then reinstall. But even untouched they respond very well to forced induction. As long as your tune-up is properly set for it and you don't have some kind of mechanical failure then it is a perfectly safe number. I like having more in reserve if i need it. I like that i wont have to push this one as hard as i did the last one because it makes just over 200 more whp at the same 20psi as my 370" LS.
That's impressive. I like how they're built. I helped a friend with a 5.3 and the thing had 4 bolt main caps, plus they were also cross bolted. It's hard to deny those engines. They sure are fugly in stock form, though. lol
YoungDart75
Well-Known Member
Had a nice weekend this past weekend at the Gold Dust Days parade and carshow. I was lucky enough to represent our local vfw post 9417 in the parade. The Dart also took home top street rod for the show.
Parade was a lot longer but my kids stopped it after I passed by.
Parade was a lot longer but my kids stopped it after I passed by.
YoungDart75
Well-Known Member
Given the issues I was having on the dyno and during hard acceleration on the street I have been suspecting that the reluctor wheel on the crankshaft had moved enough to cause the error during heavy load. So I reached out to holley and they had me shut the cam sensor off in an attempt to eliminate that sensor as being faulty. The problem continued. So I ended up ordering the msd 8623 flying external crank trigger and have gotten it installed I just need to set the pointer, sensor on the falling edge and set TDC so I can dial it in make the changes to the software and go out and test it to see if it fixes the problem. Stand by for updates, because if it fixes it maybe I can finally go racing.
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