91_B4C_RS

thanks.
not yet man. got a lil stuff to get done. need to build an exhaust. lol

prolly wont dyno it. i use the 1/4 mile dyno lol

mw66nova

iTrader: (13)

nice and strong. i like it

91_B4C_RS

3" duals summit 2 chamber mufflers will put sound clip up soon
Love the way it idles. Engine doesn't shake around as much as my 383 sbc. Surprisingly it is more mild sounding. It's a lil better matched combo than my over cammed 383 lol







Homemade throttle bracket

daniel92345z28

I'm loving your hole set up idles really well considering the cam it has.

itsjustabird

iTrader: (1)

Sounds great and revs up fast! Goodluck with it. Any idea when youll be testing?

91_B4C_RS

Hope to have at the track april 4th.

Got to fix the popping out the exhaust at idle and cruising. It is backfiring slightly out the exhaust plugs at charcoal black but not wet with fuel. Tr55 plugs gapped. 040" 33degrees timing. Maybe the carb is way off? Already messed up a set of tr6 plugs to the point it wouldn't start.

Any suggestions

xpndbl3

iTrader: (5)

turn in the mixture screws for a start. On a cold engine with no choke it shouldn't even run without pumping the throttle for a minute. If it starts up no issue, then it's super rich. Toss a wideband on it or learn to read spark plugs, and you'll go through a lot of them.

91_B4C_RS

I may have a blown power vhalve it back fired through the carb pretty hard when I was trying to start it when my plugs were messed up.

Should I stick with tr6's or go with an autolite racing plug?

mw66nova

iTrader: (13)

how much compression?

i have 11.5:1 and am running a tr6 plug with no real issues. it takes a little while to get the carb right on these motors

91_B4C_RS

Just over 11:1

zacharyhorn

iTrader: (1)

What did you use to mount the rear of the exhaust to the body? I'm about to try and find a way to mount my 4" y-pipe at the rear and am coming up short on ideas. Sounds really good BTW.

91_B4C_RS

Thanks

http://www.summitracing.com/parts/WLK-35913/

Mounted behind back seat with 3/8 bolts

91_B4C_RS

found my problem. the black dry soot plugs were from the power valve. i guess sometime over the years i removed the power valve to plug it. when i did i double gasketed the power valve paper gasket with a rubber one. this allowed fuel to enter intake at idle. threw my tr55 plugs away. threw a set of autolite 5245's gapped at .050" in it (stock heat range), fresh gas, adjusted 4 corner idle screws with a vacumn gauge. set idle at 1000 rpm. was able to get 11" of vacumn at idle. no black smoke at idle. doesnt burn my eyes at all. took it for a spin. holly cow this thing pulls hard up top. pulled plugs after a 20 min cruise and some wot hits. plugs look clean and brand new

91_B4C_RS

another shitty video lol

exhaust clip

itsjustabird

iTrader: (1)

sounds great Im excited for you lol. really cant wait to see some times!

91_B4C_RS

Thanks man. Will be at the track april 4th. Gonna run some 1/8 mile runs, then run it out the end on my last pass hopefully they tell me not to come back till its caged lol. Hope to get in the 6's in 1/8

mw66nova

iTrader: (13)

Should jump into the 6s with both feet.

91_B4C_RS

Track results

Leaving off brake at 3700rpm

Best run was 60'. 1.657 330'. 4.962 1/8. 7.730 Mph. 88.36 1000' 10.112 1/4. 12.153 Mph. 111.80

Shifting between6500-7200 rpm had no effect on mph.

Feels like it doesn't like anything over 7000 rpm. It originally was cutting out at high rpm so I jetted up 4 sizes from 76/84 to 80/88 helped a lil as far as missing out up top but no help in mph or et.

Did a hot compression test

All cylinders 190-200 psi

What gives guys?

xpndbl3

iTrader: (5)

that thing is WAY down on power, what is your timing curve like? you running 93 exclusively? come on up here and i'll take a look at it


I'd start with TR6 plugs gapped at .035 and take a look over that 60' too, that's horrible.

mw66nova

iTrader: (13)

listen to steve on this! how much timing? it took me a little while to get mine dialed in, but my first hit was still an 11.7x at 115+

91_B4C_RS

Timing is 35* straight across

Wasn't really concerned about 60' times. Its a given I can get them back into low 1.50's for sure. I was really just concerned about the mph. I think it should be at least 10mphI quicker in 1/8 and 1/4. 111mph is a bolt on ls1 car lol

Yes 93 octane.

xpndbl3

iTrader: (5)

what did plugs look like after a single pass?

how was fuel pressure going down the track? what's the fuel setup as well?

what air pressure in the slicks? drag radials?

91_B4C_RS

I need to upload the pics of the plugs.

Fuel set up.
hole drilled in bottom of stock tank. Bulkhead fitting to a 90* barbed fitting to 3/8 fuel hose to holley black to inline filter to stock tpi fuel line under car. I have a holley regulator with guage on it mounted on drivers inner wheel well. No return. 8psi at idle. I have no way to check it going down the track. Was plenty to feed my old 383 with same carb.

13psi in tires only checked them one time was more worried about mph than 60foot.

rough

Amazing engine build!! I see you live down by Indy, where do you get your N20 Bottle filled? I live up north and can't find a single place to fill it.

mw66nova

iTrader: (13)

too much pressure. 6.5lbs at most. you're pushing beyond what the float will properly regulate. the guys at quickfuel explained this to me though don't ask me to explain it, lol! all i know, is i had 8psi, turned it down to 6.5psi and picked up a bunch of mph, like 4 or better if i recall (it was before i was logging stuff so strictly)

xpndbl3

iTrader: (5)

well if timing is locked, then i'd imagine you're running out of fuel pump and it's going lean on you. You running 10 gauge wire direct to battery for the MSD setup? Also stupid question but you have the proper amount of trans fluid in the trans too right? I've seen cars be 1 quart low and down on mph as well, then add a quart and pick up several mph

91_B4C_RS

Thanks lol not so awesome as far as track results right now. I live on the westside of indy. I have never ran nitrous. I do know that automation on sourhside fills tanks

rough

Thanks for the automation tip! Ive looked and looked for a long time, seems all places that use to do it, quit filling bottles.

91_B4C_RS

Check ed trans fluid before I left to go to track all good. Msd Not wired directly to battery but based on how well it drives and how clean plugs look it is deff doing its job. Im kinda wondering if my cam timing is indeed set up right, but id think it would run funky

mw66nova

iTrader: (13)

hey hey, you may want to ignore my fuel pressure thing, but there's truth to it. turn your pressure down...

91_B4C_RS

Lol I didn't even see ur post. I will give it a shot

xpndbl3

iTrader: (5)

no wideband i'm guessing, i'd definitely get a better hold on that a/f ratio before running it again. If your ignition is "fine" like you say but it felt like it was missing, could be lean. Not to mention you should have started at 28 degrees of timing and slowly added it, based off mph and the plugs. Having tons of timing, and lean are just asking for trouble.

91_B4C_RS

thanks for the pointers guys. guess im gonna have to go back to the drawling board and sort this thing out

mw66nova

iTrader: (13)

if i can also second a couple things that steve said:

-start at 28* timing. i think the ls3 type cylinder heads like less timing than cathedral stuff, don't touch it till you get the carb right...lean and lots of timing with your compression will make for a very expensive paperweight
-take it to 6200 or so at first
-6.5psi of fuel pressure
-keep adding jet size in 2 size increments (2 front, 2 back) till it slows down, then go back one step, then bring more timing in in 2* increments
-once you get the carb and timing setup working right, start adding 250rpm's to your shift point.
-make sure you are checking tire pressure every pass, it's a good habit to get into
-write down EVERYTHING!!! make sure you record things like DA and weather conditions too.

tuning systematically like this is the only way to see real progress.

91_B4C_RS

may have found a big part of whats wrong. I AM NOT GETTING WOT WHEN PEDEL IS ON THE FLOOR!!!!!! didnt have linkage adjusted right

secondaries are about 1/8 of the way open.

that would explain weak 60ftlow mph, and not pulling up top?

mw66nova

iTrader: (13)

lol, get it right and back to the track! Keep my systematic check list though. Don't blow this thing up

Also, I don't like your throttle bracket...looks really flimsy and like it'd get in the way of the primary accelerator pump arm. I know you made it, and that's cool, but I don't think its beefy enough

91_B4C_RS

Yup that's the plan. Timing is corrected.

I did some adjustments to the bracket since I made it. I didn't like how close it was to the accel pump either

Next time I can get to track is the 15th!!!!

xpndbl3

iTrader: (5)

haha i didn't mention check throttle opening because you made your own throttle bracket and I didn't want to sound like a dick if I asked if you checked that very important part of a custom bracket

itsjustabird

iTrader: (1)

Don't lose hope just yet. This thing is gonna run takes times to work out the bugs sometimes.

91_B4C_RS

yea lmao extra set of eyes is priceless sometimes.

jbenge

iTrader: (2)

I'm pretty sure Promax refilles nitrous bottles too. They are located on the west side right in gasoline alley.


91_B4C_RS,
You may want to think about going to a bigger fuel line. I started having fuel starvation issues with the stock fuel line once I got into the mid to low 11sec range.

mw66nova

iTrader: (13)

i second that also. my 305 was having fuel volume problems into the mid 12 second range. went from 12.6x to 12.4x range when i replaced the mechanical pump and factory 3/8" line with an aeromotive s/s pump and -8 line. go ahead and do a -10 to the pump and -10 to the regulator now so it's setup for future mods.

91_B4C_RS

1.531 60' 6.991 @98mph 10.97 @ 124mph Off transbrake 30 degrees timing shifting at 7200 rpm.

Need to lower instant center. Front end goes up imediately. Feels like it needs more forward push than going up.


Currently have lower control arms at lowest position on rear end and higest setting on front torque arm.

mw66nova

iTrader: (13)

Try moving the lca's to the middle hole, this should decrease the amount of hit the tires get.

Good job dude, this is where we all expected it to be.

91_B4C_RS

thats what i am gonna try next time out see what happens.

i pretty happy . but i know there is more in it still. meet my goal on my first full track day

xpndbl3

iTrader: (5)

how did the plugs look? Now you have a chance to jet up for max mph and do the same for timing in 2 degree increments.

91_B4C_RS

didnt have the chance to mess with jetting at the track. i went back to box settings on the proform 850 76/84 6.5 pv since i was now getting WOT.

did not mess with timing left it at 30* all day left off the transbrake at 4500 rpm all day. never plugged laptop in.

the only thing i changed was tire pressures (12.5psi worked best) and shift points. ( 6500-7200) it liked 7200 the best so far. got the most mph out of it. didnt try to spin it any harder.

plugs look ok but i eally need a wide band setup

91_B4C_RS

itsjustabird

iTrader: (1)

Congrats glad its coming around!

92z28rockinmaro

this is a street legal car?