i want to run in the 10's "help"

[CHEVYMATT]

it's been a while but im in thought .i have a 416 5.7 rod 666 solid roller 13 to 1 bowtie raised runner intake 210 fully cnc'd afr's 400 turbo 4000-4500 stall . i ran it sat it ran a 11.11 qt with a 7.1 1/8th it had a 1.52 60 foot. it seemed to hook fine and went thru the traps at 6200 with a 4.10 gear and 28 12.50 15 ,im running a 950 hp vacuum carb . .............. can you help me getter in the 10's . im thinking to try a 850 but i have a 4500 dart intake and a 10.50 dominator i could try but dont want to swap inakes if i dont have to ... or do i need more gear so i get out harder and pull thru them end at a higher rpm...im thinking the vacuum secondary is hurting my 60 foot because it's only two barrel for a second. ive thought about caltracs but it runs a good 60 foot with 11.11 qt. i ran the 1/8th at 7.1 with 104 mph but only 122 mph qrt. any thoughts of help would be greatfull. im open to try anything. i was at 32 degrees timing but im going to 36 next.. thank you guys.

[CHEVYMATT]

i think the engine has enough to go deep 10's but im open . my biggest down fall is 1.5/8 headers to 3" exhaust.

[davis419b]

I am not a door car guy but i run a drabster with a 565 over a 1000 hp and i run a 4.10 gear. I would think you need at least 4.56s or maybe 4.88s. Motor should be capable of a good bit more RPM at the stipe.

[mcracecars]

Is this a street car, or race car?
122 mph is good for 10.80s to 10.90s, according to my moroso speed calculator...you are getting close.
4.88s would help. What tire are you running?, Car?
Trim some weight off of it. Fiberglass hood if you dont already have one.
A good double pump carb, I think the dominator would be too big. Good gas and bump the timing up 2 degrees at a time and watch the plugs.
It is very difficult to give tuning information over the internet without seeing the car....
good luck

[dcarr511]

With a 7.1 1/8 and 104 MPH it is really pulling hard from the 60' to 660' and then starts to fall off it seems.

Out of curiousity what size headers are you running since it wasnt mentioned ?

How much fuel pressure do you have in the 1/4 lights ?

[hammertime]

More gear would help matters
spin that motor up a bit motor, I wouldnt try the 1050 it'll be to big. Get rid of the vac. secondary stuff. I think a gear change would find the et your looking for.

[lively]

GEAR CHANGE FOR SURE!!!!!!!----AND IF IT ISN'T A STREET CAR THEN NO VACUUM SECONDARIES--- :idea: :idea: :idea: :idea:

[CHEVYMATT]

thanks guys. ok im not sure of the fuel pressure at 1/4 lights im running 7 psi at carb with a bg220 system im only running 1 inch 5/8 primaries with 3 inch collector and 3 inch race magnums. im running 28/12.50 et streets with 12lbs of pressure. im running the 950 vacuum because it was all i could get on a budget but i have a 950 dbl i can borrow. im sure the headers are hurting me. IT IS IN A 91 S10 SO ITS HARD TO GET A GOOD AFFORDABLE HEADER FOR IT . BUT IM GOING TO SOON .I MIGHT TRY A 456 BUT THOUGHT IT MIGHT HURT BUT THIS ENGINE SEEMS TO LIKE RPM. I DO DRIVE IT ON THE STREET AND TO AND FROM TRACK. IM NOT AFFRAID OF DOUBLE PUMPERS ON THE STREET . I WILL TUNE IT PERFECT . I JUST LIKE HEARING FROM SOME GUYS WITH A LITTLE MORE EXPERIENCE. THANK YOU

[chevguy65]

Along with the gear change mentioned above, it probably wouldn't hurt to go to an 1 7/8 primary, not sure but I think a 2" might be to big, but correct me if I'm wrong.

[slowman]

make one change at a time. change the timing go up 2degs and then 1 deg at a time to see were it is. give as much timing intill the mph falls of and then pull it back a deg. most 400's that i have had on the dyno with about the same combo you have like about 35-37 deg of timing. lock out the timing i have and always lock out the dist on the street or track. if you pointer is dead on then you should see max power at or around this deg's of timing. double pumper carb of the same size that you have now or the 850 if it's a mech sec. the headers should be fine. if you want pull the header and make sure the header tube is the same size or bigger then the exh port and it will be fine. if the exh ports on the heads are bigger then the header tubs you have a problem.. if the car starts slow cranking because of the locked out dist then wire the ign box so you can crank the car and then flip the switch for ign and you should have no problems. good luck

[lively]

MAN SLOWMAN!!!!!---THAT WAS A LOOOOOOT OF GOOD INFO IN A SHORT AMOUNT OF TIME :lol: :wink: :lol: ----IT PAYS TO ASK ??????--- :idea: :idea: :idea:

[dcarr511]

With him having an 1/8 MPH of 104 doesnt that say something about the power he is making already ?

He has the MPH to be running 6.50's - 6.60's yet he only runs 7.10's. For whatever reason it is falling off after the 1/8

[slowman]

yes dcarr, the mph is the biggest facter in hp. i do agree with you that when the bugs are worked out it should be there. i think it was his first time at the track and if was i think he's doing a great job. there's a little to make up in a few spots and if he works on one at a time then it will fly. there could be 3tenths in just locking the dist and setting the timing then add a mech sec carb you could see 4tenths in the front half.

[CHEVYMATT]

thanks guys for the info thus far. i have always locked dis and usually like 38 degrees but for some oddball reason i jumped from 32 to 40 i had it at 32 because i had a back fire thru exhaust when i let out but i fixed that with header leaks.after my 104 mph run with 32 degrees and 77 front jets with power valve and 92 rear jets with pv plugged i looked at plugs and they were white so a old racer at the track told me to go with the factory specs for the carb of 84 squared with valves so i jumped to 85 with valve and 95 with out . my 60 foot went to 1.63 and my 1/8th was 100 and my qt was 11.28 at 120 but i also had jumped my timing to 40. . my plugs looked gray to black and it ran like crap. so i went down to 80 front with pv and left 95 rear alone but i ran out of track time. im firly new to racing . i had an old 73 camaro that i had dialed in nicely to a 11.40 but im trying to the first of my small local group to hit the 10's i know this combo is capable but i have some tuning to do.my old 406 liked 1.3/4 pipes with 3.5 exhaust and slowed to a 11.60 on 3 inch exhaust . i will be keeping a close eye on this site so i can learn and tune it better . im leaning on 36 timing, slicks and no et streets ,4.30 or 4.56 gears and 1.3/4 to 1.7/8 headers and run them open at track and back to 3 inch on street. what ya think... thanks again

[CHEVYMATT]

two more thoughts one i run at a local track that is a bit on the cheap side with light that need adjusted every now and then and has not time read outs . but i can get 20 runs in 4 hours if i wanted. but i try to run it 4 or 5 times a trip. the other is that im going to try a 950 dp as well thanks

[slowman]

make small adjustments at a time stop jumping all over the place with the tune. set the timing at 34 to start and work your way up from there 1 deg at a time. i think you would be surprised if you seen some engines dynoed and seen the power fall off in power over 1deg in time or 1 size in jets. you will never find the tune by making to big of a change all at once. the best advise i can tell you is slow down and it will come changing gears from 4.10 to 4.30 will do nothing. headers may help some but making the car run right will be worth more then a gear or headers. i would put a mech sec carb on it before i spent the cash to replace the gear and headers. just a f.y.i i ran 1 7/8 to 2" step header on a 1000hp small block with 3.5 exh pipes and mufflers.

[CHEVYMATT]

thanks for help . i'll be doing some changes carb is definately first because it's free. and tuning is as well. thanks slowman

[slowman]

keep us updated with the car it should fly just take your time. remember rome wasn't built in a day, i always whated to say that lol.

[CHEVYMATT]

no rome was'nt built in a day but they wished it was so they could go racing. thanks

[lively]

PATIENCE GRASSHOPPER PATIENCE!!!!!!!! 8) 8) 8) 8)

[Dragginby]

I am building an s-10 too. I had a 406 that made 587hp @6700 rpm, that went 9.94 @ 135 in a 65 elco that weighed 2800lbs. My 406 had almost everthing that yours has. My cam was a Ultradyne 279int 281exh @.050 and 630 lift, 13.5-1 comp, Victor Jr. Demon 1050, 1-7/8 2" step, 1.5 rocker, AFR210 fullport. It made it's most power @ 38 degree, @ 36 it made 584, @ 6500.

I blew that motor up and went to a 434sbc. with all the same valvetrain. It made 602hp @ 6300rpm, and 559lbs @5000rpm @ 33 degrees timing. I dynoed it with 2 sets of headers.... the 602 came from a set of 1-7/8 step 2" with 28" primairies, I switched out the headers to the HedmanHustler S-10 fenderwell 2" primairies, and 24 long primaires. It lost 50lbs and lost about 15hp. This motor needs 28" primaires tubes, and a nice collector.

Your motor probably needs a good header and a better carb, leave the 4.10's. I am running 4.10 in my truck. Try 34degrees of timing and go up or down 1 degree. You should be running around 125-130mph.

[billhendren]

Go to www.dynojet.com and enter your location,they will tell you all the locations of there chassis dynos in your area. rent an hour of time and you will have your answerers on timing and jetting. unlike an engine dyno with a variable load control valve the Dyno jet unit has a fixed weight you accelerate so it doesn't change run to run,you can see any change at all.at the track there are to many variables to find just a few H.P. on the dyno one degree timing change will show up and you can overlay the graphs from run to run and see any gain or loss.Bill

[bbchevy]

Hey Z,
I ran almost the Same Combo as you last season,KINDOF?
89 S10 bck-half,9"Ford 4.86 Gear,400 Turbo 9"Coan 5000 Stall,355 SBC 13 to 1 590 Solid roller,Brodix track 1's,Super Victor,MSD 6al Blaster coil,MSD Billet Dist.,Aeromotive SS F/Pump,750Holly D/P 4779,3100lbs.
The Truck would Leave with the Tires 8 to 10"s up,1.40 60',6.84 1/8 108MPH.And it would only go thru the Traps at 5800.Theres no doubt in my Mind that More gear,i ran a 31 tall tire.So,with a 5.43 and a 1050 Dominator,6.40's would have been with-in Reach!
Later
Greg 8)

[CHEVYMATT]

well i picked up a set of custum made gary cook 1 3/4 to 1 7/8 step headers tuned and with 3.5 collectors . i guess i'll start there

[CHEVYMATT]

well
i have the glide in . it feels a little differant but it still come out hard on the streegt. lite those et streets up. im running a 4.10 . since i ran my 11.11 i have installed 1 3/4 step to 1 7/8 headers and 3.5 exhaust from 3 inch. i have also installed 1/2 aluminum line from 8an that had a 3/8 repair line. i have also installed a holley 125hp pump because my bg220 was not keeping up. i have also installed a 950 double pumper with 80 front jets and with power valve and 84 rear with power valve . i have also installed a powerglide with 4500+ convertor but feel i need a 456 gear or greater thanks for the help.i run 28,12.50 et's thanks guys