to start, been running at the track all season, havent run lower than this though.
Its a GM FastBurn Motor 385 w/ Lt4 cam and 1.6 rockers, fastburn heads and a holley 750 carb....
Tremec TKO600 Tranny w/ a Stage 3 Ram Clutch
Ford 9" Rear w/ 3.89 Gears
Full Race Suspension and Roll Cage, 8pt.
Weighs in at about 3800lbs

Im launching at 3500
Power Shifting at 6500


Best Time on Slicks
R/T - .101
60' - 1.830
330 - 5.596
1/8 - 8.699
mph - 77.84
1000 - 11.312
1/4 - 13.502
mph - 103.46

What am I doing wrong, or is this about the max I can pull out of this setup. Should I be running faster than this, I know there are guys with this setup running mid 12's,
Should I launch at a higher rpm or should I shift at a lower rpm like 5500.

 

That's gonna be about right at your heavy weight and crate motor hp. takes alot of grunt to move heavy cars.

try leaving at a higher rpm, try shifting at a lower rpm...never know unless you try or dyno the thing to see where it'd be optimum to leave/shift at.

 

well i'd say at only 385 crank hp, through a 9" and 3800lb car, you're not doing too shabby. Drop some weight and play with shift/launch points. Also with a 3500 launch on slicks i would suspect it to do better than 1.8 60's, so maybe try messing with your tire pressure as well.

 

Launch harder... With a 9" and a TKO600 on slicks, even though the car is heavy you shouldn't be breaking anything. The mph does seem low, but playing with shift RPM can help. Also losing any weight that you don't need would be a good start.

 

Your ET and MPH come out to roughly the same HP. The weight is killing you. Knocking it down to 3500 pounds would get you a 13.14. Knocking the race weight down to 3200 pounds would get you a 12.75

 

im running 11psi in 26 inch tall slicks, but i dont know where I can shed weight... most of it is suspension and the cage... cage is about 300lbs... kinda wish i didnt put it in now...lol...
so i guess im not doing too bad then, just seemed kinda slow, maybe its time for a roots charger from procharger... just need the cash,lol

 

How is your cage 300 pounds lol? I think my 10 point cage weighed 70...

 

Do you have a LT4 std cam or a HOT cam?

 

its a hot cam which i guess is the zz4 cam but gm calls it an lt4 cam idk why... and as far as the cage is concerned the car weighed 3350 without it and 3600 with it and new sway bars, at the truck weigh in so im guessing around 300 but that seems about right.

 

my 6 point weighed 70 pounds IIRC, subframes were another 55

 

you have two (related) things killing you.

1. your car weighs 3800lbs.. thats ALOT.
2. you're only doing a 1.8 sixty... street driven 3rdgens should be doing 1.6 or faster.

you need to fix your 60.
you need to take weight out of the car.

get them both down, and you'll be knocking on a 12.

then make some more power...

 

Just curious what are you running for an exhaust system ? I am no expert by any means, but have been told that my flowtech short headers and homemade y-pipe wouldn't support the hp my motor is supposed to make. The local exhaust guy said they are probably costing me ~40 hp

 

xpnd, i have the subframes also with full suspension, lotta weight... as far as an exhaust its just a 3" dynomax through the y pipe, but i have an exhaust cutout just after the ypipe so its almost like running open headers...
maybe its just the weight issue, just dont know where I can loose a 100lbs or so.
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i could get rid of the A/C condenser, rear seats are already gone.. idk how to lose more weight...

 

best 60ft i ever pulled was a 1.734
that wasnt on slicks either...
What are you guys running for tire pressure in slicks, ive been playing around with 11 1/2 and 12psi... should it be lower like 7-8psi

 

slicks work best on heavier cars with higher pressure-- 13-18psi is around where i'd be looking, start at 18 psi and drop it 1 pound every time as 60' improves, then when it no longer decreases add 1/2 pound and that's optimum.

 

I ran 15 lbs in mine. That was with ET streets.

 

I dont think they offer the HOT cam in that engine standard. Its a upgrade I think. Does the car idle smooth or does it have a bit of a chop to it?

 

What size are the Flowtech headers? By the way I ordered some Flowtechs for my 2000 Tahoe OBS and they had flashing where the pipes go into the collector. If it was not cleaned out it would hurt the flow. I had to send them back (twice) for a number of reasons. Went with another header.

Edit: One of the reasons I sent them back is I wanted 1 5/8" headers and they kept sending me 1 1/2" headers. The numbers on the box and packing list were correct for the 1 5/8" headers but infact they measured 1 1/2".

 

Tire pressure in slicks is no different than in a street tire. Do a burnout and leave a strip of rubber on the pavement, look to see where the contact patch is. If it's leaving rubber along the sides of the tire and none or very little in the center then increase tire pressure.

Finding the best tire pressure is trial and error and heavy cars don't like low pressures. Start with 10 psi and keep going up 1/2 or 1 psi at a time. your 60' times should drop. When the 60' start to increase go back to the last tire pressure. You want as much tire pressure as possible before the tire starts to lose traction. That's the best tire pressure.

Is your 3800 pounds a race weight? You, fuel, etc in the car? I sure hope so. A full cage in a 13 second car is overkill since it isn't required until you hit 9's. Although you don't need a 6 point bar until you get into the 11's, even a typical 13-16 second street driven third gen can use a roll bar to help stiffen the unibody.

I guess everyone thinks they have an 11 second car until they get that first time slip.

 

vwdave, its an upgrade for like 600 bucks, its got some chop with just the headers but its smoother with a cat back on. engine still rumps well though

 

stephen, 3800 is race weight with me in it. the cage is in there to stiffen the frame along with a set of subframes, but to tell you the truth I did think i was gonna run mid 12's till i got the first time slip.lol ill get there eventually

 

When I needed to run faster, I had my skinny friend drive my car, saved about 200 lbs.

 

Well, first thing I would do is chassis dyno it. Its rated at 425, so figure 20% that brings us to roughly 340whp. If your car measures under 300whp, you know there is a engine performance problem. Your ignition timing could be off, you could be running too rich. Also having it dyno'd with a wideband on it is a very good tool to have.

 

Maybe I missed it in the above posts, but are you running headers designed for the FastBurn large raised d-port exhaust?

If you are running stock-type cast iron manifolds on the FastBurns, there is your problem. I would almost guarantee, if you have the cast-iron manifolds, you are blocking 1/3 to 1/2 your exhaust port.

Even if you have headers, especially the smaller, cheaper versions, you are still covering about 1/4" to 1/3" of your exhaust port.

I bolted a set of SLP 1-3/4" headers up to a valveless FastBurn head I had setting on my workbench. Even the 1-3/4" headers covered about 1/4" (at the top) of the exhaust port.

Just a thought.

jms

 

Well with your MPH, the car is capable of 13.1's / 13.0's
At 103 hp and 3800 lb weight that puts you at roughly 340 crank hp. However I really doubt your car weighs 3800, though I could be wrong..

Your 60ft could deffinetly improve, the biggest thing is make sure you are not bogging at all.. That kills a pass.. keep the car in its powerband all of the time. I would not be too concerned about only making 340 flywheel.. 385 is a corrected figure.. Go hit some sea level air and you will pick up alot depending on your current altitude and weather. Ie: corrected DA.
Keep at it, try new things! you will get faster. as you get more effecient the MPH will increase as well some..

 

the car is running with hedman headers right now 1 3/4 to a y pipe....
87ta- the car is about 420 at the fly, prob about 340 at the wheels just like the guys above said..
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im running tommorrow night so im gonna try some new stuff,,, like 15-16psi in the slicks, launch at 4000rpms, see if that changes anything... will update tommorrow night, thanks for the tips guys.

 

[QUOTE=kelham;3435216]the car is running with hedman headers right now 1 3/4 to a y pipe....
87ta- the car is about 420 at the fly, prob about 340 at the wheels just like the guys above said..
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If only trapping 103 you are no where near 420 flywheel, sorry..

420 Flywheel will yield you around 112 trap speed in a 3800 lb car.. That is using corral forum calc. which has proven mine as well as several other combos to be very close to actual flywheel numbers..
Many people on here confuse flywheel and WHP!
The corral calc is very close and will tell you what an effecient car at that trap should run..
According to corral calc. My 3440 lb camaro which traps 142 best produces 798 flywheel - wherew othes would say thats whp, if thats the case my car is making 1000 hp - sorry, not happening! The heads don't flow nearly enough to make that number..
It kinda goes along with everyone has an 11 sec car and makes 500 hp scenario..
You have a good combo and good runner, keep playing you will get it flying..

To further back that up, an LS1 with a few bolt ons, like exhaust,headers, lid, pulleys. will make just about 420 flywheel.. They weigh about 3750 with 200 lb driver and trap 108 stock, with above bolt ons will trap around 111-112.

Not saying you engine in not capable, just is not producing that number unless your killing it that bad with driving.


PS.. I Just realized you are from Pitt. Pa. - I race at PRP, You?
I was just there last night for Tnt. Did you have the nice Red formula with black wing? if so I was beside you at gates with the red 94 firebird being towed by Red Ram..

 

no that wasnt mine i saw that guy though, I had the orange one I was running out of lane 2 all night, you going up tonight for the bad boyz bad girlz at 8
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i did see your car just didnt get a good look b.c didnt you run slicks, I saw you driving around but slick lanes ran fst on wednesday didnt get a good look around... hopefully see you up there this week, nice car

 

No,
I won't be able to make it tonight - working night shift.
I don't think I will be there until the 24 fri or 29th wed.

On the 24th a guy on WWW.PITTSPEED.COM is renting the track from 12-4:00 and looking for 40 cars to join in. running 2 lanes, will be $50 per car.
Should get loads of passes. Not sure if I am attending that or just the reg tnt that night, I will more than likely go to the rental and maybe even the reg tnt.
Post up a pic of that car, sounds nice..

 

Ya know, that's what I was thinking this whole time. 3800lb is heavy, but 13.5 is not much for 425HP or so. Something isn't right there. I'd dyno it to see if you're down on power somewhere and work on that. Bring yourself up to the 425HP you think you have. I'd go for power before weight reduction, but that's just me.

 

87ta- thanks i think i might do that on the wednesday... ill post pic in next reply. problem is with going tonight a bunch of drunk ****s will be up there at 2am racing so im prob heading out a 12 for my cars saftey you know...
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/Users/kelham/Pictures/iPhoto Library/Originals/2007/Roll 1/DSC_0048.JPG
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[IMG]/Users/kelham/Pictures/iPhoto Library/Originals/2007/Roll 1/DSC_0048.JPG[/IMG]
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cant upload the pix files to big how else can i get it up on here