5678TA

holy crap. you gained 31 mph out the back door. on my best run, i picked up 25mph. 92mph - 117mph.

you did 88-119 loooooowwww 11's here you come.

1bad91Z

iTrader: (1)

119 mph ...holy crap! That's easily good for mid 11's.

Did you feel a difference with the high-flow lid?

Do yourself a favor and just fix the throttle body and make another pass before you install a bigger MAF. You're going to have quite a bit of tweaking in the PROM to get that bigger MAF to act right.

Orr89RocZ

iTrader: (20)

What happened on that run compared to the other runs? 119 is a HUGE difference in 108-112 and even 116.

If that is infact a true mph for that car, then you have the power to go 11's. I'm just shocked its not if its getting 60's that good. 1/8 mile mph/et is down from where an 11 second car should be tho. Should be in the 90's mph in the 1/8 if your trapping 116+. Gaining 31 out the back door is quite impressive and not normal from most cars i've seen

joeblue83

iTrader: (8)

its really a stumper, once I get the throttle body fixed it will be running right hopefully

Big Dog Chevy

Yeah the mph seems to show that somthing was changing during those high mph runs. Maybe you stomped the gas harder to open the tb up more or had a head/tail wind on some runs. I've never seen a car pick up that kind of mph with no changes during the runs, but NOS in third gear! lol

joeblue83

iTrader: (8)

yeah thats what I thought. And its running NA, and will probably stay that way. I was thinking that sometimes the throttle body was opening up more sometimes than others, that is why I have to make a better bracket for it.

5678TA

looking at your time slips, something is happening after the 60ft. its almost as if 2nd gear is slipping really bad.

for the trap speed and 60ft you have, you should be crossing the 1/8th at slowest 7.3 @ 93mph. and crossing the strip under 11.40.

i have a 0.1sec slower 60ft and lower trap speed but i beat you to the 1/8th by .4 sec. time for a tranny rebuild, i think?

joeblue83

iTrader: (8)

Its just been rebuilt last year and maybe has 1000 miles on it. Its a probuilt rebuild kit that suppose to handle 550 horsepower.

Orr89RocZ

iTrader: (20)

How bad is converter slip? maybe its blowing through it abit?

Either way I agree, the 1/8 mile vs 1/4 mile stats just dont seem right.

One run you have 91 mph in the 1/8 which is moving pretty good and only hit 108. Came out the hole great then top half shut down alot.

Far right 2 runs you have similar 1/8 mile, similar 1000 and then somewhat similar 1/4 mile ET's but the MPH are 6 different. First run is comparable to these, just with a bad 60 foot, but the 1/4 mph is closer matched to the 119mph run. Sounds like the power is there just something is cutting out on the car whether its slippage or throttle body issues still


Need to get that TB fixed and re-run with 100% for sure WOT. And back it up with several passes

NatesZ/28

this is why you need to datalog your runs in a notebook. Is your launch sequence exactly the same? Are you deep staging some times and sitting shallow on others? Did you get out of the groove?

Im looking for any inconsistencies. I agree with the others that either your converter is causing problems or its in the TB. Have someone videotape your runs too its very informative.

Is your converter an off the shelf piece, or is it something you ordered from a company that was built to spec? I know for a fact that several people had problems with off the shelf converters being inconsistent by 3-400rpms.

I had a Yank converter in my last car and it was sent back and forth before it was exactly what was needed

joeblue83

iTrader: (8)

Just found out the problem with my car. The o ring on the fuel pump was not there and was leaking pressure I guess. I was getting only 35 psi to the fuel filter. I put in a new walbro pump with the o ring and it jumped up to mid to upper 40's. I am working on tuning it, because before it started to run real lean above 3000. I am taking it to the dyno tomorrow and hopefully racing it on either saturday or sunday. Hopefully I will get that 11 second timeslip this time. I will keep everyone updated

Orr89RocZ

iTrader: (20)

So some of those runs it must have had pressure and you trapped well, then bleed off other runs. But did you notice it going lean at the track on the higher mph runs?

joeblue83

iTrader: (8)

not at all. But on the dyno, it was ridiculus

Big Dog Chevy

OK, that would do it. I always say, most of the time it's the little things that hold us back. lol

joeblue83

iTrader: (8)

didn't go racing last weekend, but did go to the dyno. Here is the graph. I am hoping that I can go one more time before the season is over

Orr89RocZ

iTrader: (20)

looking good! very strong motor there, you got about same hp as my old 383 but over 20lb feet on me

Thats a mid 11 second car next time out

1989GTATransAm

iTrader: (3)

I agree with Orr. Eleven second runs are in your future if you can hook up. Interesting that you are making the power with Dyno Don short tube headers. They do not seem to be hurting a thing. My experience also.

Orr89RocZ

iTrader: (20)

Good point i didnt notice..i had long tubes and he's still got more torque than me

Big Dog Chevy

That's a pretty good dyno run Joe. With your power you should be mid to low 11s when you dail in your driving tech. I myself really didn't think you gain or loose much with long tubes vs shorties at 500 and lower hp levels. I always focused on the collectors sizes/lengths and the header back system. I have shorties on my 88' and it makes plenty of power, I just tuned the collectors for my motor setup and it works fine for me.

1989GTATransAm

iTrader: (3)

"I always focused on the collectors sizes/lengths and the header back system."

I believe that is the key to the whole thing. Also a well constructed set of shorties like Don's doesn't hurt.

joeblue83

iTrader: (8)

thats what I have been saying for years. Instead of losing some ground clearance and many headaches with long tube headers, I always recommend using a good set of shorty headers. You may lose a very small amount of power, but they are worth it.

Orr89RocZ

iTrader: (20)

I'd love to try a set of shortys on my old 383 to see what would happen as my clearance was HORRRRIBLE.

I got shorty type headers on my motor now tho Dont need to worry about collector length, just use turbos to make exhaust move... thats my philosophy.

Joeblue, whens the next track date? Still have my throttlebody if you wanted to try a 58mm

joeblue83

iTrader: (8)

hopefully going the last weekend in oct if the weather can hold. I think the 52 mm is enough for me though. thanks

1989GTATransAm

iTrader: (3)

A 58mm won't hurt a thing. It will either do nothing or add power. This of course may depend on how well your cold air intake flows.

Orr89RocZ

iTrader: (20)

You ran a monoblade right and it didnt hurt anything? May not show anything problems on a dyno and infact increase power, but what about the street? Is there hesitation or lack of power feel with larger air flow (lower velocity) from the throttle body?

1989GTATransAm

iTrader: (3)

Hi Orr

No problem at all running my mono-blade on the street. However like my daughter said "when you give it the gas something happens". You just adjust and get used to it like anything else.

joeblue83

iTrader: (8)

going to the strip on halloween. Its suppose to be in the high 40's to low 50's, should be a good day of racing. I can almost feel that 11 second slip

smier

Awesome thread, hope you finally get it, post up the results!

joeblue83

iTrader: (8)

was digging in my file cabinet and found this. This is what my car put down before I did anything to it. It had a mini ram, zz9 cam, edelbrock heads, and a 3 inch edelbrock catback, along with edelbrock shorties and y pipe. The only part that is still on there is the mini ram and the catback

joeblue83

iTrader: (8)

just went out today, nice and 50 degree day. First few passes I was hitting off the rev limiter, I adjusted it and then started running low 11.70's here are a few of the passes. My best of the day was 11.722. I also had a 1.51 60ft but can't find that slip.

joeblue83

iTrader: (8)

here is a better pic

joeblue83

iTrader: (8)

my computer is not working right

Orr89RocZ

iTrader: (20)

Bingo! i knew you had 11's in that thing! Congrats!

1989GTATransAm

iTrader: (3)

Yes, congratulations. Looks like you have things sorted out. That is a good 60' time.

joeblue83

iTrader: (8)

here is a video someone took

http://www.facebook.com/video/video.php?v=321308130257

joeblue83

iTrader: (8)

finally got the car out and raced last weekend. Got a new best of 11.70 with a 1.55 60ft. Went from a 3 inch cutout to a 3.5 inch cutout and swapped from an electric water pump to mechanical and picked up close to 1 mph. I also swapped my mt et street radials to mt et streets, and was very consistent on my 60ft, ranging from 1.55-1.58. I still need to work on my shift points. I am shifting at 6200 right now, but my best run I shifted at 6000 into second and the car seemed to like that best. Hopefully I can catch my new goal of 11.59 or quicker but not faster than 11.49...no cage. Just a average street car that gets 19 mpg.

5678TA

congrats dude!!!

joeblue83

iTrader: (8)

took it out for the last race of the season. It was 65 and sunny little wind so it was gorgeous to race. I thought I would try something different this time. I started by having the cutout on instead of off. I got a 12.20, the next race I took it off and ran a 11.64. Just shows how restrictive a 3 inch edelbrock cat-back is. I also got a new best of 11.64, my old best was 11.70 a few weeks ago. The only thing I did differently was lower the shift points from 6200 to 5900 and seemed to make a little difference. Come next year I hope to get to my goal of 11.5x. And this car is a daily driver in the summer, and based on how I drive it can get 18-19 mpg's.

1989GTATransAm

iTrader: (3)

Sounds like you need a 3.5" catback.

1bad91Z

iTrader: (1)

Congrats!

Now all you need is some exhaust work and the ram-air boxes to feed the high-flow lid!

That should get you the 11.5x

Big Dog Chevy

Makin some good power and getting faster every time out. You need to bring your car to me so I can buiild you one of my custom tuned exhaust systems

joeblue83

iTrader: (8)

the car is actually tuned with the cutout off. I don't think I would pick up to much by changing my exhaust. Right now I am working taking some weight off my car and myself. Don't have to many places left to take weight off.

Orr89RocZ

iTrader: (20)

I think your getting about as much as you can out of that setup considering the cam size. Converter and gear seem well matched. Running pretty good for that combo.

joeblue83

iTrader: (8)

I was debating on getting a little bit bigger cam, but then my goal is to go no quicker than 11.49, I don't want a cage in my car

Orr89RocZ

iTrader: (20)

Sounds like your combo is pretty good then. Not much more to change to get 11.49 max ET.

joeblue83

iTrader: (8)

Looking to go a little quicker now. Still trying to get into the 11.5x. What I am thinking of upgrading is my cam. Currently have TPIS ZZ409 cam. Very streetable and able to run pump gas, and get 19 mpg. What I am wanting is still be streetable, run on pump gas. I was looking into TPIS ZZX cam. Any suggestions

1989GTATransAm

iTrader: (3)

Do you know the specs of the ZZX camshaft? A MiniRam will want some rpm.

joeblue83

iTrader: (8)

239 duration .558 lift 112 lobe separation

1989GTATransAm

iTrader: (3)

IMHO for some streetability that cam will be on the large size. Maybe an XFI cam with the 236/236 lobes. That should do the trick. We have cars locally running the MiniRam with the XFI 230/236 cam and making 400rwhp in there 355 motors. By the way I have a Mike Jones custom 233/233 camshaft with 368 cubic inches and it is very streetable. However I have 11.12:1 compression. Also running the 11.5's you are searching for. So maybe that camshaft would work for you.

Orr89RocZ

iTrader: (20)

IF your willing to swap springs, one of the high lift lobes from comp sound good to me. 230 with .603" like i ran on my 383. 1.6 rocker. Else run .565 but I think those heads will do ok with abit more lift and smaller 230 duration. Tighten the LSA, minirams like overlap. Cam it like a LT1 car. Some of the better combos I've seen run 110 and less with about 230 deg on intake. 234-236 on exhaust would do. 108-109 lsa would rock, still be streetable.

A shelf grind I like would be AI's 230/238.566/.566 110 or 234/242 .576/.580 110. Both rock in LT1 cars. Or have them custom grind one but that will be 450 bucks. You can have Jones do one for 330, or someone else.

ZZx is also a great cam. Proven to work well with superram 406's and miniram combos too. It looks big but it should be fine on a 383. Idle should be fine, as overlap really determines idle quality and low rpm driveability. I ran more overlap on my 383 than that zzx. My 401 has a cam similar to that ZZx, although few deg short at .050 its similar at advertised. Its a baby cam in my 401, and on a 383 it should do somewhat similar.