Went to the track tonight. Slower then I wanted but still fun

[87turbodance]

Here is my best run of the night tonight:

r/t .747
60' 2.4240
330' 6.8410
594' 9.8429
1/8ET 10.51
1/8 MPH 67.07
1/4ET 16.3019
1/4 MPH 83.79

1989 Spirit ES with carpet and headliner removed.
'89 3.0 short block with '00 Caravan heads, Diamente cams. Plenum divider removed and 52mm TB. Megasquirt literally tuned by the seat of my pants because I don't have a wideband.
Stock original suspension rubber and shitty after market rubber engine mounts. Bad inner joint on re-man passenger axle. A543 3.50 FD . I went through the traps in 3rd around 7000 rpm.
My first trip to the track in my Spirit ever. Wheel hopped through 2nd. 200lb driver and 120lb passenger.

[cordes]

Wow, that's great. IIRC I managed a best of 16.3 in my Daytona at SDAC a couple of years ago. 89' TII with a MP cal in it. Keep up the good work.

[Sundance 6g72]

we got a best of 15.1 today.. comparing both cars, that not bad considering how much is done to the shadow. Anyways, good work. ill try and get you a better tune once i have my car back on MS. our cars are very similar!

[turbovanman²]

Not bad at all considering your first time at the track.

[87turbodance]

we got a best of 15.1 today.. comparing both cars, that not bad considering how much is done to the shadow. Anyways, good work. ill try and get you a better tune once i have my car back on MS. our cars are very similar!

I'm going to have to add a LC1 to my Christmas list I think.

I really just want add an Eaton M90 Harv style. 8psi from a roots blower should get me in the 14s.

[Ondonti]

Should I think it strange that people running MS are running slower?

[Sundance 6g72]

yes

[Shadow24]

14.308 @ 94.74 = slow?

87 - I'd DEFINITELY get an LC-1. Without proper A/F feedback, your tune is probably not as accurate as it could/should be robbing you of power. Once i got my tune dialed in somewhat and the nut behind the wheel tightened, I was mid to low 14's fairly consistently in a full interior P-body. I'd venture a guess that you are ritch in the upper RPMs robbing you of top end HP. I have had to constantly PULL fuel from my full throttle section of the map to bring the A/F #s in line. I probably can pull more, but haven't been able to drive the car due to all the transplant work for the new chassis.

[Sundance 6g72]

speaking of wideband and wot tuning, for NA, what afr do you guys like. with ms i was at 12.5 and stock computer 13.2 not sure what was faster (no dyno )

the timing made the difference though, thats for sure

[shadow88]

The general rule for a safe a/f ratio is 13:1 for N/A engines. 12:1 for turbo engines and add 1 point richer if using nitrous oxide.

[Sundance 6g72]

i was plannin on 11.5 for turbo...

ryan, ill try and get you a tune of like 12.8:1 and that way with your setup it might be a tad richer or leaner but shouldnt be horrible...

what does your spark advance look like?

[87turbodance]

Should I think it strange that people running MS are running slower?

I blame it on the fact that my VE table is mostly a guess at WOT.

[Vigo]

Ouch. You're definitely way down on power,thats slower than a stock 3.0/543 full weight spirit would be capable of.

I dont see how you could be making power at 7000 rpm with a barely modified engine.. I think you would have trapped higher shifting to 4th (if not ET'ing better).

My 3.0/543 dynasty with plenum divider removed and 52mm tb feels like it's peaking around 52-5300 rpm and then tapering slowly. My auto rev limiter is still at 5800 and while it's losing power at that rpm, i would ride it a few hundred more rpm before shifting if i had the option. I cant picture stock diamante cams moving your powerband more than a few hundred rpms so you're still way out of the powerband at 7k. It's possible some weirdness in your tune is tricking you into shifting late by being in better tune at 6000-something rpm than it is at 5000-something.

The wideband should let you get a lot closer to the full potential of the motor.

[87turbodance]

I'm pretty sure that I was holding onto each gear too long. I was looking through my logs and I was shifting at 6500. I think I would have been better shifting at 5500 or 6000. I love the sound of the 3.0 at 7000 rpm though.

I have 45 degrees timing at WOT from 3000 rpm to red line.

I'm not sure that the Diamente cams make any difference at all.

[Vigo]

6500 is not as outlandish to be shifting at.. Right now my 3.0 dynasty is probably pretty similar to your weight and motor mods (other than the cams, which may or may not do anything) and i think my ideal shift rpm is probably ~6000rpm. Not far off the ~5700 i shift at now. I wish i had the moved rev limit like you because i hit the rev limiter at ~85mph in 3rd, right where i'd probably be trapping, so it would be nice to be able to ride 3rd out at the track like you.

I saw in your other thread that you said you trapped the same whether shifting to 4th or staying in 3rd, so that addresses my earlier statement... I guess it all comes down to waiting for that wideband.

[87turbodance]

I really just want to get a wideband and some reground cams. I do need to replace some of the suspension rubber and engine mounts with poly. I thinking about a new chassis though. My Spirit is in great shape for it's age but it has some serious rust where the floor meets the firewall and behind the front wheels.

[bond_bbs]

There is a spotless bone stock 3.0L / 543 1993 Shadow in Bolton for like $2000ish. Red with black 16" Pumpers (I think that's what they're called).. if I remember I think it only had like 170km on it. Its on trader.ca

[Shadowv4l]

The First time i was ever on a drag strip my stock 3.0L DD shadow had two 16.4 second passes back to back at 82mph each time, 4 speed auto, 130,xxx miles on motor. My second run I was able to grab a .174 R/T . Off the line the car did great but by the time I made it past half track the car felt like it wanted to take a nap. Does anyone have a 1/4 mile time for a stock 3.0L with a manual? I think the 4 speed is holding the engine back quite a bit.

[Vigo]

Plenty of people have made runs with 3.0/5spd cars, what body style are you asking about? The shadows run quicker than the spirits, daytonas, and lebarons.

Generally the p-bodies will run low 15s stock, and some people have gotten into the 14s. The heavier cars run high 15s stock. This is for the 5spds. Even the lightest 604/auto struggles to get into the 15s stock, although there have been one or two people that have gone pretty quick with near-stock 3.0/autos.

[Shadowv4l]

A stock P body 3.0 manual hitting 14's, geez, I didnt think they were that quick. Maybe ill have to keep my eyes open for a manual trans and perform a rainy day swap, haha