Posted By: mopar dave
dominator lean tip-in - 08/28/14 05:48 PM
could a leaky primary throttle shaft cause a lean tip-in issue? thinking this may be the culprit of my lean cruising issues.
dominator lean tip-in
Posted By: Cab_Burge
Re: dominator lean tip-in - 08/28/14 06:21 PM
Quote:I would try squirting some carb or starting fluid, very carefuly, a little bit at a time, around the throttle shafts with the motor running to see if the idle speed increases or decreases from the vacume leak
could a leaky primary throttle shaft cause a lean tip-in issue? thinking this may be the culprit of my lean cruising issues.
If it does change that MAY be part of the problem 
Posted By: johnmilner
Re: dominator lean tip-in - 08/29/14 01:32 AM
2.5, 3.5, 4.5 power valves the culprit. a holley carb must run rich for light throttle cruising imo. everybody leaning them out when they foul cold plugs street cruising. put a 6.5 pv in mine 73-83 jets and backed timing up 30* total. hotter plugs rc12yc. cruising like a new yorker now. and sounds great at traffic lights. change plugs when using nitrous. car was breaking up like crazy before light throttle cruising, fine wide open. now can cruise or race, just have to change plugs for nos.
Posted By: mopar dave
Re: dominator lean tip-in - 08/29/14 05:21 AM
no power valve. square jetted. I guess davinci wants the carb back to take a good look at it. thanks
Posted By: Thumperdart
Re: dominator lean tip-in - 08/29/14 03:36 PM
Make it a 2-circuit w/a front pv and the proper pvcr size and never foul plugs again. I`m converting a 9375 right now for similar reasons............. 
I`m converting a 9375 right now for similar reasons.............
Posted By: mopar dave
Re: dominator lean tip-in - 08/30/14 05:30 AM
I will most likely end up doing the BLP 2 circuit kit, but my issue was never rich and fouling plugs. quite opposite which I never found anyone on the web with the same issue.
Posted By: Thumperdart
Re: dominator lean tip-in - 08/30/14 04:40 PM
Quote:
I will most likely end up doing the BLP 2 circuit kit, but my issue was never rich and fouling plugs. quite opposite which I never found anyone on the web with the same issue.
So at that spot where you say it`s lean does the wb see it that way? I test idle off idle on the foot brake fully warm and slowly climb up in the r`s watching/feeling what`s goin on then tune from there. I had a super lean spot above 1500 r`s when climbing up on the foot brake and fixed it w/a bigger ifr.............went from .037 to .039 and it`s sweet now. You MAY have a vac leak so get out the carb clean and find out and if not, well you know the drill.
Posted By: mopar dave
Re: dominator lean tip-in - 08/30/14 04:47 PM
yes, it slowly climbs from 13.5 to 16.5 range at tip in while cruising or parked in the driveway.
Posted By: MR_P_BODY
Re: dominator lean tip-in - 08/30/14 04:49 PM
Quote:
yes, it slowly climbs from 13.5 to 16.5 range at tip in while cruising or parked in the driveway.
That sounds more like a vac leak
Posted By: Thumperdart
Re: dominator lean tip-in - 08/30/14 04:57 PM
Quote:
yes, it slowly climbs from 13.5 to 16.5 range at tip in while cruising or parked in the driveway.
Could be..........turn out the idle mixture screws and see what happens. Have you verafied the vac leak yet w/a cleaner?
Posted By: MR_P_BODY
Re: dominator lean tip-in - 08/30/14 05:09 PM
Quote:Quote:
yes, it slowly climbs from 13.5 to 16.5 range at tip in while cruising or parked in the driveway.
Could be..........turn out the idle mixture screws and see what happens. Have you verafied the vac leak yet w/a cleaner?
I was assuming he has messed with the mixture screws
to get it idling right... I still have no idea why
any of you even use the A/F meter for idle.. no 2
engines are the same... and NO ONE can give a number
of what it should be.. on a carb
Posted By: Thumperdart
Re: dominator lean tip-in - 08/30/14 05:14 PM
It`s a guide and just shows what makes it happy but not in stone. The wb definately comes in play for tip in and transition though for sure and of course cruise and wfo........... Climbing on the brake and having a stumble w/out the wb is a bit trickier and more time consuming. So, is there a leak?
Do you know the idle bleed and ifr sizes?
Climbing on the brake and having a stumble w/out the wb is a bit trickier and more time consuming. So, is there a leak? Do you know the idle bleed and ifr sizes?
Posted By: mopar dave
Re: dominator lean tip-in - 09/01/14 04:25 AM
yes I agree. I think the throttle shaft leak may be my tip-in issue. yes, idles perfect, wot bad ass, cruise tip-in sucks. leans out and starts surging.
Posted By: mopar dave
Re: dominator lean tip-in - 09/01/14 04:31 AM
I agree, the a/f meter is a tool to help tune carb. don't know why anyone would want to tune by ear. i'v done that in the past and the a/f meter is way quicker. dom, the carb is now in a box going back to dan davinci as he has asked for it back. thanks
also, put 950 back on and it runs perfect. no issues
also, put 950 back on and it runs perfect. no issues
Posted By: MR_P_BODY
Re: dominator lean tip-in - 09/01/14 04:36 AM
Quote:
I agree, the a/f meter is a tool to help tune carb. don't know why anyone would want to tune by ear. i'v done that in the past and the a/f meter is way quicker. dom, the carb is now in a box going back to dan davinci as he has asked for it back. thanks
also, put 950 back on and it runs perfect. no issues
Ok.... so whats my perfect A/F reading at idle.... I
have a meter but I dont use it till I have it idling nice
Posted By: mopar dave
Re: dominator lean tip-in - 09/01/14 05:05 AM
well, innovate suggests between 13-14.7 as a target. that's where I set mine. (13.5-14)
Posted By: MR_P_BODY
Re: dominator lean tip-in - 09/01/14 05:11 AM
Quote:
well, innovate suggests between 13-14.7 as a target. that's where I set mine. (13.5-14)
Thats pretty good when they have no clue on my cam..
I'll still stick with the way I set idle.. takes
maybe 5 minutes after the engine is warmed up
Posted By: Thumperdart
Re: dominator lean tip-in - 09/01/14 06:17 AM
Quote:
I agree, the a/f meter is a tool to help tune carb. don't know why anyone would want to tune by ear. i'v done that in the past and the a/f meter is way quicker. dom, the carb is now in a box going back to dan davinci as he has asked for it back. thanks
also, put 950 back on and it runs perfect. no issues
I`d run the 950 over that dommy any day then I`d convert the dommy to a 2-circuit and be done w/it.............
Posted By: mopar dave
Re: dominator lean tip-in - 09/01/14 06:21 AM
that is just a suggestion by innovate. I understand that every program or combo is different. their suggestion worked for me. I could of set mine at 12.5-15:1 as it idle the same, but I ended up with 13.5-14 which is right in the middle of their suggested target.
you mentioned getting it dyno tuned awhile back. well what do you think they use to tune your carb with for best a/f setting? an a/f meter. theres reads out on a pc screen, mine reads out on an in car gage. same tool
you mentioned getting it dyno tuned awhile back. well what do you think they use to tune your carb with for best a/f setting? an a/f meter. theres reads out on a pc screen, mine reads out on an in car gage. same tool
Posted By: MR_P_BODY
Re: dominator lean tip-in - 09/01/14 06:27 AM
Quote:
that is just a suggestion by innovate. I understand that every program or combo is different. their suggestion worked for me. I could of set mine at 12.5-15:1 as it idle the same, but I ended up with 13.5-14 which is right in the middle of their suggested target.
you mentioned getting it dyno tuned awhile back. well what do you think they use to tune your carb with for best a/f setting? an a/f meter. theres reads out on a pc screen, mine reads out on an in car gage. same tool
On the dyno they didnt touch idle... we jetted for
max power... when I put the engine in with the trans
I set the idle mixture and idle speed
EDIT
and yes they did use a A/F meter to set the max power
but they also went higher and lower to see what the
dyno said... and if you call that the final jetting
your wrong.. you need to go to the track and jet for
max mph... then take your A/F reading and see what
it is as a reference point so its easy to get back to
Posted By: mopar dave
Re: dominator lean tip-in - 09/01/14 04:35 PM
I used a chassis dyno (war room,A&A) and had the idle set in a happy place, so they didn't need to touch that. yes, I agree. after dyno tuning always required larger main jets at the track, 2 sizes larger usually. that's why I decided it would be smarter to get an innovate wide band and tune it myself to real world setting. mainly I use it for wot jetting which I found on my combo is 12.8:1 range for best mph. I still tune idle by ear and then refer to gage to see if its in the ballpark and it is. none of that is an issue, its the tip-in. I can feel it surging and referring to the gage I can see its between 16-17:1 ratio, so the gage comfirms there's an issue.
Posted By: sixpackgut
Re: dominator lean tip-in - 09/01/14 04:37 PM
My thinking is the carb is to big. Air stalling on tip in. No signal to the boosters. Converter to tight. I run a super sucker under my dom on the hemi because my converter is to tight and i have 355 gears. It really helped street manners for a small engine and bad combo
Posted By: mopar dave
Re: dominator lean tip-in - 09/01/14 04:42 PM
you could be very well right. it is a 1080 he calls his 1100. I thought it was alittle large at the time, but he insisted its what my combo needed. I also wanted a 2 circuit build at the time and he once again insisted on a 3 circuit. he's the pro on these carbs so I just followed his lead.
Posted By: Thumperdart
Re: dominator lean tip-in - 09/01/14 05:06 PM
Quote:
you could be very well right. it is a 1080 he calls his 1100. I thought it was alittle large at the time, but he insisted its what my combo needed. I also wanted a 2 circuit build at the time and he once again insisted on a 3 circuit. he's the pro on these carbs so I just followed his lead.
PRO is a relative term................
Posted By: mopar dave
Re: dominator lean tip-in - 09/01/14 05:43 PM
at this point, you are correct. i'll give him a second chance and if it wont tune right i'm callin blp.
Posted By: Thumperdart
Re: dominator lean tip-in - 09/01/14 06:22 PM
Not saying they aren`t good just maybe a bit behind the times..............kinda like some guys on here............ 
Posted By: MR_P_BODY
Re: dominator lean tip-in - 09/01/14 06:43 PM
Quote:
Not saying they aren`t good just maybe a bit behind the times..............kinda like some guys on here............
Dom.. I know your snide remark was directed to me..
but I have had and used a A/F meter years before you
bought yours last year.. but now that you have a new
play toy your the PRO... thats fine by me
Posted By: B3422W5
Re: dominator lean tip-in - 09/01/14 06:51 PM
To the OP....
Had great luck with the pro systems 1100 dominator on my old stroker.... At the track.... It wasn't well suited at all to the street, loaded up... But I am not a carb tuner guru at all.
That all said, the best all around street strip carb for that same motor was the race demon 1025 rs 4150 carb. Ran same as dominator at the track, and way better on the street.
I was an idiot for selling that carb..... Super sweet piece
Had great luck with the pro systems 1100 dominator on my old stroker.... At the track.... It wasn't well suited at all to the street, loaded up... But I am not a carb tuner guru at all.
That all said, the best all around street strip carb for that same motor was the race demon 1025 rs 4150 carb. Ran same as dominator at the track, and way better on the street.
I was an idiot for selling that carb..... Super sweet piece
Posted By: mopar dave
Re: dominator lean tip-in - 09/01/14 07:49 PM
I was looking for a used 1025 when I bought the dominator. couldn't find a used one for less than 750. sure do hold their value.
Posted By: Thumperdart
Re: dominator lean tip-in - 09/01/14 08:12 PM
Quote:Quote:
Not saying they aren`t good just maybe a bit behind the times..............kinda like some guys on here............
Dom.. I know your snide remark was directed to me..
but I have had and used a A/F meter years before you
bought yours last year.. but now that you have a new
play toy your the PRO... thats fine by me
Not saying you Mike and respect most of your opinions and it was not directed at any one person at all. I got my wide band 4 years ago and I`m definately no pro YET!