track results first time out with BBD

[warthog]

Finally got the Dart to the track.  My goal is 12.90 and I went 13.26 @ 100.5.  Heres my specs:   67 Dart, 383 bored 30 over balanced blueprinted, 10.0 compression, MP 284 484 cam, 452 heads port polished, holley strip dominator, 750 carb, 2800 stall, manual reverse valve 727, 3.91 posi, 10x28 quick time pro, fiberglass bumpers and hood, A100 seats.    I am slightly disappointed but considering the 383 is really nothing more then a stock motor with ported heads and a cam its not too bad.  I set the timing at 18 degrees and haven't done any tuning to the carb or anything else really.   I am hoping that a switch to 4.30 gears will get me closer to the goal and start playing with jets etc.   Anybody have any thoughts that are helpful?  Thanks Dan

[doug 371]

what rpm did u go through the traps at?

[warthog]

Thats the one thing I didn't get when I went to the track.  I do know that it was not near its peak rpm.   That is a good point, I probably should run it again and get the RPM through the traps as it might need a set of 456 instead.

[b569rr]

 I have the same compression, cam, carb and ran 13.28 @105 in a full interior Road Runner with 3.55 gears. Your mile per hour is low. There is more there.

[dangerdawg]

yes indeedee,  .

[CudaSRT8]

Congratulations.    I think you did real good for your first time out.    More gear and some tuning and you'll be in the 12's with no problem...

[warthog]

The gear thing is a definite change.  My other question is that it seems to stop pulling in third gear.  I have a blue pump, regulator, and a sump etc so I feel confident that its got good fuel pressure.  I was wondering if carb jetting or? could be related to this?

[St.Louis-Dart]

More gear and some tuning and you'll be in the 12's with no problem... 
            ''

[warthog]

Opened the holley up tonight and I have 72's on the primary side and 80's on the secondary side.  I was wondering if anybody had a suggestions on what jet to try now?  Thanks Dan

[brg1966]

Against my better judgement.  B/C everytime I make a sugestion it seems to turn into a bash me.  18 degrees timing?  Is that advance?  If so, what's the total?  I would say do nothing esle but set the total advance at around 42 degrees and I would bet money you'd be in 12s.

[warthog]

As well as your car runs you won't here me bash your suggestions.   I haven't timed the car like I should have.  I basically gave the distributor a turn and we went to the track.  I had been having a voltage problem with the battery turning the motor over (in the trunk) which I got straighten out but because of that I was afraid to advance the dist any more then I had for fear it wouldn't start after it got hot.   Your are right I need to actually time it and know what it is at.  Thanks  Dan


quote author=brg1966 link=topic=32703.msg322201#msg322201 date=1221445121]
Against my better judgement.  B/C everytime I make a sugestion it seems to turn into a bash me.  18 degrees timing?  Is that advance?  If so, what's the total?  I would say do nothing esle but set the total advance at around 42 degrees and I would bet money you'd be in 12s.

 

[nasty68]

There is definatly more in your combo.  I had the same combo except was running the closed chamber heads with the small valves (516 i think), same cam and all and it went 13.09 at 104 in a 3600# challenger.  I would bet it will go faster with more timing and more gear.  I had 4.10's in the chally and it was crossing the finish line at 5600 rpm.  I really needed more gear.

[flyboy01]

Against my better judgement.  B/C everytime I make a sugestion it seems to turn into a bash me.  18 degrees timing?  Is that advance?  If so, what's the total?  I would say do nothing esle but set the total advance at around 42 degrees and I would bet money you'd be in 12s.

Yes, also, get a performance curve in that dist, and play with the jets, squirters, and make sure the throttle opend all the way when you mash the pedal, I think your car had 12.80's in it with that combo. There are Darts out there with 383's and .509 cams that are running low 12's.

[warthog]

Thanks for all the info guys it does help.  I got some larger jets tonight for the secondaries and I am going to play with timing.  I agree it really should be faster its just finding it.  Honestly, most of what I am doing is new to me.  This is the first time I have actually rejetted a holley for example, its easy but I just have never done it.

[brg1966]

Against my better judgement.  B/C everytime I make a sugestion it seems to turn into a bash me.  18 degrees timing?  Is that advance?  If so, what's the total?  I would say do nothing esle but set the total advance at around 42 degrees and I would bet money you'd be in 12s.

Yes, also, get a performance curve in that dist, and play with the jets, squirters, and make sure the throttle opend all the way when you mash the pedal, I think your car had 12.80's in it with that combo. There are Darts out there with 383's and .509 cams that are running low 12's.

That's a great point!  I did re-curve my distributor and that helped a tenth.  I changed out the pump shooters from 25s to 35s and went from 12.50's to high 12.20s.  All those little things ad up!  Another piece of advice is make one change and make a pass.  If that helps then make another change.  This way you're able to know exactly what changes made improvements.

[gt]

brg1966, did you mean to say 32* as opposed to 42*? I am guessing that it was a typo error.

gt

[brg1966]

brg1966, did you mean to say 32* as opposed to 42*? I am guessing that it was a typo error.

gt

Nope!  I ment 42º advance.  That's where I set the 383 I had in my car.  It ran 10.80s no spray all motor. 67dart383 has my old motor in his car now.  It runs 11.99 now, but he has a different converter and no tranny brake and street slicks.

[warthog]

I stepped up from a 80 to a 84 secondary jets tonight.  Can't really tell how much better it is but definitely didn't hurt it.  We will see next week if it did anything.  I am still intertaining putting 73's in the primary side instead of the 72's in there now but I don't want to loose that quick throttle response.   I am also going to put a set of NGK's in there too (See other post for opinions on what number please).   Thanks for all the input guys.   Super Dan

[brg1966]

I stepped up from a 80 to a 84 secondary jets tonight.  Can't really tell how much better it is but definitely didn't hurt it.  We will see next week if it did anything.  I am still intertaining putting 73's in the primary side instead of the 72's in there now but I don't want to loose that quick throttle response.   I am also going to put a set of NGK's in there too (See other post for opinions on what number please).   Thanks for all the input guys.   Super Dan

When it comes to jetting.  My advice is take your jets to the track and change them, make a pass, record results.  Repeat until car slows down.  What I'm getting at is you need to find out if the change really helped.  Performance at the track is a good indicator.  Are the power valves blocked on that dominator?  I blocked mine.  I also ran square jetting.  Meaning I ran the same jets on all four corners.   

[383man]

When we had the 383 in my sons Dart it was almost the exact same combo.   It was a stock bore and piston 383 that had 452 heads we did some minor bowl blending on and cut the heads to get 9.5 comp with the stock pistons.   The heads were all stock other then that.   We used the MP .484 cam on a 104 centerline with all stock rockers and pushrods and I shimed the rocker shafts for .020 lifter preload.  I did also add Crane single valve springs.  The rest of the internal eng parts were all stock but I used ARP bolts.   We used the Performer RPM intake with a 750 DP and CPPA headers.   I curved a stock dist and used the MP orange box with 38 total timing.  Had a manual V/B and a tight 10" 3000 TA convertor.  I used 3.91's with 26" McCreary G/60-15's.  It was an all stock body 72 Dart that weighs 3600 with my son in the car.  It ran a best of 12.31 @ 110 with 12.40's and 50's @ 108 to 109 on average days and on good days she would drop right in the 12.30's @ 110.   
The car loved the 3.91's with the 26" tall tires and he still uses the 3.91's and 26" tall Hoosier's with the 400 in the car now.  I would keep your 3.91's and just go to a shorter tire and tune your ign and carb as you should have easy 12's in your combo.  Good luck , Ron

[warthog]

Its got a power valve in the primary side not secondary.  Its 750 holley double pumper with a proform body. Somebody else mentioned blocking the power valve also since its issue it on the top end and not MPH.  With the mild cam and such I wouldn't think that its loosing vacuum and shutting the power valve. Of course I am still learning on these carburators and don't completely understand everything.

I stepped up from a 80 to a 84 secondary jets tonight.  Can't really tell how much better it is but definitely didn't hurt it.  We will see next week if it did anything.  I am still intertaining putting 73's in the primary side instead of the 72's in there now but I don't want to loose that quick throttle response.   I am also going to put a set of NGK's in there too (See other post for opinions on what number please).   Thanks for all the input guys.   Super Dan

When it comes to jetting.  My advice is take your jets to the track and change them, make a pass, record results.  Repeat until car slows down.  What I'm getting at is you need to find out if the change really helped.  Performance at the track is a good indicator.  Are the power valves blocked on that dominator?  I blocked mine.  I also ran square jetting.  Meaning I ran the same jets on all four corners.   

[67Dart383]

brg1966, did you mean to say 32* as opposed to 42*? I am guessing that it was a typo error.

gt

Nope! I ment 42º advance. That's where I set the 383 I had in my car. It ran 10.80s no spray all motor. 67dart383 has my old motor in his car now. It runs 11.99 now, but he has a different converter and no tranny brake and street slicks.

Yea!  Brian(Brg1966) is right, we have the timing set at initial 25 advance 18 total 43 degrees!Tried other settings but those work best! Plugs we have run autolites AR-73, 85 and ngks that I don't have the number in my head right now! We seem to like NGKS, Thats whats in it now!Our sig tells you our set up, carb jetting 76/84 seems to have given us our best times, we have been up too 90/94 jets. Whats  your 60ft times  Warhog? Ours 1.67 best. Good Luck! Also Brian this is one sick( strong,good) motor, we love it! Every one loves to hear the cam hit when creeping in the pits or on the streets !We have put over 60 passes on it at track alone, not to mention street launches!Thanks Again!
      BILL