Got the car fired yesterday and went to the track today. The engine runs pretty good but is a complete dog off the line. Its really sputtering off the line so there is definately a few tenths in the 60' alone. It seems rich on the pump shot but it is set up pretty conservatively. Here are my timeslips. I tried several different launch techniques but it just didn't run clean on any of them.

60'........ET........MPH
1.89.....12.24....113.66
1.86.....12.22....112.92
1.91.....12.29....113.06
1.83.....12.23....112.42
1.92.....12.29....113.14
1.97.....12.39....112.72
1.92.....12.28....113.61

I am going back out tomorrow morning. 8)

 

Looks consistant enough to me to win a few bracket races. How were your reaction times

I wish I could be so lucky to get my car back together. The way it looks right now there's no way the engine will be together within a week and the next race after that is the season final on Sept 10/11. I'm trying hard to make that race but still not sure if it's possible.

 

Today was a TNT and the Fastest Street Car Shootout. I ran in Outlaw Street to support the even (and went out in the second round). Consequently, we ran a pro tree. The lights weren't great but were better than the other guys. I ran one test pass on a full tree and cut a .036. Tomorrow is the points race so we'll see what happens.

Also, what about going to Edomonton after the 10/11? I think they have two double weekends after that.

 

As much as I'd like some track time, I don't want to travel 3 hours with an untested package. If anything needs to be repaired or changed, it couldn't be done while out of town.

I'd love some runs against a pro tree just to see how well the car reacts. I already launch off the top bulb on a full tree so it wouldn't be much different.

 

Here are today's results:

60'.........ET..........MPH

1.89.......12.24.....113.65
1.85.......12.15.....113.20
1.81.......12.11.....113.41
1.87.......12.28.....112.23
---switched to 28*11.5 ET Streets for the last two runs--
1.90.......12.32.....112.14
1.99.......12.40.....112.19

I got a perfect light on the third and final test run. 8) On the next run (elimination round 1), I cut a -.007 and was out of the running.

The bigger tires didn't really help at all on the lunch. They actually slowed the car down. I changed the squirters on the carb and it runs a little cleaner but I am still dissapointed with the 60's.

Density altitude was about 4000' both days. Shouldn't be too hard to get it in the 11s with air alone.

 

How come with the stickies there was such a huge variance in the 60'? change routine, staging rpm? what the heck happened.

You get those figured out, you should have a competative car high 11's easily with air change.

 

The car was stuterring off the line on Saturday with 31s so I changed to 35 squirters. The car ran a little cleaner but not really any faster. I tried a few different launch techniques to get it to clean up but none of them really worked.

 

What carb are you running? VS or DP?

 

BG Speed Demon 750 DP. Jetted 76/79 with a 6.5 PV.

 

Why so small on the secondary jets? Stock is 76primary and 84 secondary

 

Would assume the way it's jetted he's running both front/rear PV's, personally I'd square them up if doing that, but that's just me. Have you had a chance to check mph with jet changes yet? or are you still in the rough in stages of getting it tuned?

How much play do you have between your accelerator pump and the arm. We usually shoot for .015 clearance before gas squirts out the squirters, sometimes we set them so when your checking clearance some gas may trickle out, you just dont want a bunch of clearance as it will lead to some bogging issues when you punch it.

Also if you have'nt done so yet, install the infamious vent tube hose, not having one often casues fuel to sloch out of the vent on a good launch and "flood the carb" just install it if you have'nt already to eliminate that possibly common problem.

I'd also go back to the 31 squirters also and retune. 35's are pretty big, but having run them on my old 355 with no problems in an 830 carb it should'nt affect your motor either, but it's alot easier to test from square one than have 3 or 4 different mods done to it at once since maybe one thing maybe the cause of the whole lot of problems due to snowball effect.

 

speaking of jetting. Would it seem odd to you(IHI) that an 850 demon on a 383 built similar to yours runs very lean with stock 85 primary and stock 93 secondary jets? I checked my plugs when I got home from last fridays RSD and they were white as a ghost.

 

Something is definatly wrong. my old 360 would 60` in the low 1.70 range and one 1.69 time.What brand converter are u using???I even have the same stall as u.

 

84firebird383 - I lent the carb to a friend that helped me with the car last year before he moved. He had it on his low 12s BBF. He had it jetted 76/79 and suggested I try that as my starting point. The car seemed to run alright down the track so I left the jetting as I wasn't sure whether it should go up or down anyways.

IHI - Just one PV. I didn't play with anything at the track except for the squirters. I just got it fired and wanted to take it out for a few shakedown passes. I haven't checked the pump/arm clearance or put in a vent tube hose. I'll do those though. Thanks for the tips.

daverr - The converter is perhaps an issue. It is modified powerglide piece that went 3200 behind a much milder 327. We figured it should go 3500 no problem behind this but it sure hasn't so far. The carb isn't clean on the hit so its hard to see what it really does. I calculated top end slipage at 4% though.



Here are a few pics courtesy of Blair at nitroimage.ca:

 

oh my, you'll be into alky jetting soon, and yes that seems very high unless air is stellar-like cordova ET finals last year that was my jetting, but the DA was -500' so I needed the extra gaz to keep from running lean.

How much jet playing have you done and what were the results?
What ignition are you running? MSD? I gave up trying to read plugs with the MSD ignition 3 years ago, and went right to the mph reading on the slip. When they're set up right I think the msd just burns that much hotter and it decieves you a little in plug reading, believe me, when I first went out years ago with the new MSD and 950HP I had same problems with brand new white plugs and 99 squared jetting. Talked to some other racers that had same problem in the past and they all recommended just watching mph and using that to tune. I did that and picked up quite a bit and it helped consistency also.

 

Yes I have MSD ignition.The 85 and 93s are what came stock with the 850 demon.I haven't played with jets at all yet .I just bought some 87's for the primary and 95's for the secondary next time I go to the track. Guess I wont know for a month if I'm running lean or not Thanks for telling me about the MSD tho. That probably is my plug reading problem.I quess I'm going to have to get some 83's and 91's also.IHI.Do your plugs ahve any tan color at all to them?

 

84firebird383 - you should just get the whole 64-99 kit. Much easier that way. I have a Digital 6 and MSD Pro Billet distributor. I'll have to pull my plugs and see what they look like too.

 

Trevor are you racing open exhaust or thru an exhaust system? If you are running exhaust what type?

 

I have Hooker long tubes into a symetrical 3" y-pipe that goes around the tranny into single 3" with a dump before the axle. I was running an open cutout all weekend. My y-pipe has flanges on all 3 ends for easy removal. I may be able to pick up a little bit of MPH by removing it and running open headers.

 

I was asking because I run a single 3" flowmaster cat back off of a mufflex y pipe. I pick up .6 when I run the y pipe only.I'm thinking your car should be at least as fast as mine if not faster.

 

What is your combo and best ET again?

There is definately more in the car. I literally got it running good in the garage, put a few miles on and drove it to the track the next morning.

 

I too am still tuning out gremlins,But I ran an 11.3@ 119.98 last RSD off the Y-pipe on used up slicks with a stock suspension.I Know there is more left in it.My combo is a 10.8:1 383 with brodix track 1s a crower solid roller that I dont remeber exact specs.(its 9 years old)I remeber its around 248/252@50 for duration and just over .600 lift ground on a 108 lobe separation.I have hooker long tubes 3.73 gears a th350 with a TCI super streetfighter converter.Oh yeah I have an 850 demon and a team G intake.

 

Well, my cam has about 10-12 degrees less duration, my heads are 195cc vs your 220s, and I am using a dual plane intake right now. I think I'll be hard pressed to match you. I have a Vic. Jr. intake but want to see what this one will do when tuned right. I also have a junk converter right now too.

 

My buddy has an 84 camaro with a 406 with the 195 AFR's and a comp cams 288 hydrualic roller that just ran an 11.29@119.But he has a tremec 5 speed and launches at 5500 and also has 4.10s. He started out in the low 12s high 11's and just keeps on getting faster.Whats really odd is there was an 85 camaro with a 385 that my buddy built that ran 11.3@118 with a stock car .450 lift hydraulic cam and unported vortecs on 3.42's!The car only weights 2860,but still.I think you will eventually be able to get your car into the low 11's

 

How much does your buddies 84 Camaro weigh?

 

He changed to manual steering , took the heater out and has a fiberglass hood.Thats about all he did to lighten it up,well except for a few rust spots I'm not sure of his exact race weight,but Its probably in the 3300 to 3400 lb rang.He also added a few pounds back with his SSM lift bar kit and ford 9 inch.

 

I have a modified 800 holley dp on my 383, and have it jetted 78 square with 45 squirters and brown cams. 50 cc pumps front and rear. No power valves. That's for 90 degree midwest temps and corrected 4000 foot air. When the air gets better say 800 ft I use 80s / 82s. Plugs do tend to look lean with msd. Another thought , are you running no lead race gas? It does make a differance on plug reading. I switched to no lead Turbo Blue this year, quite a differance on the plugs and pistons. On my 406 Pontiac, 830 holley no power valves 41/ 45 squirters, 93/94s for jets. Don't know what I'll use for jets yet in the cooler temps. My 383 does like a lot of pump shot to keep it clean. I get 1.40 60 ftrs if I can get bite.

 

My pump cam kit should come tomorrow. I'll have to play around with them at 'street legal' night tomorrow and see what it likes. Pick cam right now in it. I have it jetted to the factory 76/83 right now but it might want a little more.