1/4 mile time estimate

[komninon]

68 charger
520 ci
indy ez heads porter racing hyd. roller 596hp  621tq
tko 600 modified by libertys gears
dana 60 354 gears
295-50-15 bfg
this is the first time going down the track
what do you think it would run?

[cdr]

Your ET / MPH computed from your vehicle weight of 3900 pounds and HP of 596 is 10.89 seconds and MPH of 122.97 MPH
BUT THERE ARE LOTS OF VARIABLES

[justcruisin]

Those BFG's will hold you back some, my guess is a low 12 - high 11.

[komninon]

i was thinking around 13sec because it is a stick car and not too much experience.
what rpm should i shift?
thank you.

[BSB67]

If that 600 hp was on Dwayne's dyno, I too would go with the 123 to 125 mph.. If you are not experienced with launching and racing a manual transmission, your et could be anywhere.

[komninon]

Dwayne did the heads , intake ,carb , and cam. it was dynoed at a diferent shop in chicago.
i drive manual trans for 20 years, but never raced.

[c00nhunterjoe]

Driving and racing are 2 different things with a stick car. The tremec is much easier to speed shift though but you have a lot of torque.  If it hooked and if you car is set up to handle that power it will go 10s easy. On bfg's you won't get traction in any gear with that much power..... I want to see some pics and videos! That car should be sick! 

[randy73]

New or old tires?

What shape is the suspension in and are you setup for the track?

I would say anywhere between mid 11's to high 14's,

[komninon]

tires and suspension is new.   car is lowered, has  caltracks, frame conectors , torque boxes.
do you think it is a waste to go with street tires?

[c00nhunterjoe]

Street tires will never give you a good grip at he track. Fresh suspension, connectors and caltracs is a plus. Pick up a set of stickies for it. Worse case run it on the bfg's and get a mph idea at the track. Your et will suffer big time but the mph will give you a better idea of the cars potential.

[Cooter]

Why guess? I mean you dyno'd it, Take it to the track and no more guessing.

[firefighter3931]

George....it's making enough power to run into the high 10's (MPH) but the ET will depend on traction, gearing and the driver's ability to efficiently shift the transmission. 

You'll need a descent set of sticky tires to effectively launch the car. If you can get it to 60ft in the high 1.40's it'll run high 10's 


Ron

[1970Moparmann]

George, wheres the pictures?  High 10's is sick...

[komninon]

thank you guys,
i will try to get some pictures soon

[komninon]

 i just got back from greatlakes dragway
first time in my life....did 3 runs with bfg radial spining 1st gear   

60'  2.159
1/4 13.406
mph 107.51
am i going to see a big difference with slicks?

[JB400]

Yes, you will. You'll notice a difference with more practice as well.

[Cooter]

Don't be surprized if that Tremec begins to get hard to shift on Slicks. If you've never driven a stick car on tire, it can be hard to pull gears.
also, from your ET, what was the reaction time?

[komninon]

r/t     .560

[JB400]

r/t     .560

Your going to have to work on that.  Got anything to practice with, or do you count down at the stop lights on the way to work?

[BSB67]

i just got back from greatlakes dragway
first time in my life....did 3 runs with bfg radial spining 1st gear   

60'  2.159
1/4 13.406
mph 107.51
am i going to see a big difference with slicks?

Did you have fun?  Sounds like a real blast!!!  Got any stories?

My recommendations will probably be different from everyone else's.  I suggest that if it is a street car, work with what you have.  When everything else is right, the tire won't make the difference between a fast street car and a slow street car.  Said differently, a 600 hp street car IS fast, it will just be a little quicker with slicks.

I don't think your launch and 60' ft times (i.e. the items that the slicks will improve) account for the difference between where you're at, verses where you should be.  Were there any other issues down track either operator or equipment related?  What shift RPM?

My initial, equipment related recommendation would be to check your fuel pressure at WOT.

[cdr]

Did you have fun?  Sounds like a real blast!!!  Got any stories?

My recommendations will probably be different from everyone else's.  I suggest that if it is a street car, work with what you have.  When everything else is right, the tire won't make the difference between a fast street car and a slow street car.  Said differently, a 600 hp street car IS fast, it will just be a little quicker with slicks.

I don't think your launch and 60' ft times (i.e. the items that the slicks will improve) account for the difference between where you're at, verses where you should be.  Were there any other issues down track either operator or equipment related?  What shift RPM?

My initial, equipment related recommendation would be to check your fuel pressure at WOT.

bsb67
very nicely said ?

[c00nhunterjoe]

A 600 hp car should have a lot more mph then 107.
did you "sissy shift" the car?  Gear changes in a stick car can make a huge difference. No offense, but most people can't "shift" a stick car.

Cutting a 2.1 60' on bfg radials behind a 600 hp stick car is very respectable, especialy for your 1st time.

As stated above, and assuming the fuel pressure isn't dropping off, sicks won't make the car a whole lot faster on most applications. Once you learn how to "drive" the car down the 1\4 slicks might pick you up a few tenths. The key here is your mph, and in my opinion, its way too slow your your build.

[komninon]

i launched at 3000rpm and shift 2-3-4 at around 5000rpm.
i am going to use my cousins  mt et street radial 275-60-15 next week.

[cdr]

you have something not right here,ether the dyno was about 200 hp off or you have a really bad tune and or other issues as BSB67 & others have said,I WOULD NOT RUN THIS CAR a full pass until i checked fuel flow & pressure,timing,air fuel ratio. call & talk to the person that runs the dyno & see what he says about the #s that his dyno produces compared to how other cars have run  if starving for fuel you WILL be building another engine

[cdr]

also check that you are getting full throttle ,have someone push accelerator to floor & look at carb to see if it is wide open,with engine NOT RUNNING

[six-tee-nine]

going fast with a stick car mean being rude to the ting......

when the light goes green you plant your right foot all the way down and keep it there untill you cross the line. changing gears means tipping the clutch and violently slamming the stick towards the next gear.
From what I've been told these cars should be able to hold up to that violence. Ronnie sox did it all day long


http://www.youtube.com/watch?v=nKfPiVjUdjU

[Cooter]

going fast with a stick car mean being rude to the ting......

when the light goes green you plant your right foot all the way down and keep it there untill you cross the line. changing gears means tipping the clutch and violently slamming the stick towards the next gear.
From what I've been told these cars should be able to hold up to that violence. Ronnie sox did it all day long


http://www.youtube.com/watch?v=nKfPiVjUdjU

But Ronnie had a tractor trailer load of fresh engines/transrears free from Chrysler, so he didn't give tow sh*ts if he blew something up... Therefore, he got good at it.

[komninon]

cdr you were right. pushed accelerator to floor & look at carb it is not wide open.it is way off. we could not  fix it with my bracket, so
i ordered hly20-112 bracket . i should have it by Friday. we will see......

[firefighter3931]

cdr you were right. pushed accelerator to floor & look at carb it is not wide open.it is way off. we could not  fix it with my bracket, so
i ordered hly20-112 bracket . i should have it by Friday. we will see......

That's definately a problem....good that you figured it out.  If you don't have the 20-7 throttle adapter make sure to get one of those too ! 

George....how much does the car weigh ?


Ron

[komninon]

i think i have this 20-7 bracket, but do i need it with hly-2--112? i am using aftermarket lokar throttle cable ......
i do not now the exact weight, but would think 150lbs lighter than stock.

[firefighter3931]

i think i have this 20-7 bracket, but do i need it with hly-2--112? i am using aftermarket lokar throttle cable ......
i do not now the exact weight, but would think 150lbs lighter than stock.

The Holley 112-2 is listed a base plate....not sure why you would need to change that part ?

With a Lokar cable and the 20-7 adapter you will be able to achieve wide open throttle with the pedal on the floor. It's just a matter of adjusting the cable properly. 


Ron

[komninon]

just got back from greatlakes dragway again
did 3 runs again only difference i fixed the throttle cable.

60'  2.132
1/4 12.9
mph 109.99
next week i will try et street radials

[BSB67]

just got back from greatlakes dragway again
did 3 runs again only difference i fixed the throttle cable.

60'  2.132
1/4 12.9
mph 109.99
next week i will try et street radials

Fun meter still on high?  I'm having fun and I'm not even there.  Keep it up.

It is important to compare this to the last time out.  First, you need to standardize the results to make it an apples to apples comparison.   The short version is this:  The weather conditions were a lot better yesterday than they were on September 15 accounting for much of the improved results.  Yesterday, the DA was like 150 ft, and on the previous time out it was like 1700 ft.  Apples to apples, yesterday was 12.9 @109.9, and the past run was 13.15 @ 109.6 when adjusted to standard conditions.  The carb opening made almost no change  (per the mph difference) and most of the et improvement was likely due to driver technique.


Have you checked the fuel pressure at WOT yet?

[1970Moparmann]

George, next year I would love to meet you at the track.  I never been either.  Two Chargers down the track would cool. 

[cdr]

i just got back from greatlakes dragway
first time in my life....did 3 runs with bfg radial spining 1st gear  

60'  2.159
1/4 13.406
mph 107.51
am i going to see a big difference with slicks?

it did pick up some

just got back from greatlakes dragway again
did 3 runs again only difference i fixed the throttle cable.

60'  2.132
1/4 12.9
mph 109.99
next week i will try et street radials

[firefighter3931]

i just got back from greatlakes dragway
first time in my life....did 3 runs with bfg radial spining 1st gear  

60'  2.159
1/4 13.406
mph 107.51
am i going to see a big difference with slicks?

it did pick up some

just got back from greatlakes dragway again
did 3 runs again only difference i fixed the throttle cable.

60'  2.132
1/4 12.9
mph 109.99
next week i will try et street radials

It did improve slightly but that was probably due to the lower DA....2.5mph & 4 tenths is definately going in the right direction George   

I'm thinking fuel delivery   

My old 446 made a lot less power than George's new stroker and it would still pull 115-116 mph at 4100 raceweight.   



Ron

[komninon]

that would be great 2 chargers going down the track. i was there for 2 hours and was the only mopar .
also, Ron i fixed the cable your way. i have to adjust it little more since i have a hard pedal right now.

[cdr]

i just got back from greatlakes dragway
first time in my life....did 3 runs with bfg radial spining 1st gear  

60'  2.159
1/4 13.406
mph 107.51
am i going to see a big difference with slicks?

it did pick up some


just got back from greatlakes dragway again
did 3 runs again only difference i fixed the throttle cable.

60'  2.132
1/4 12.9
mph 109.99
next week i will try et street radials

It did improve slightly but that was probably due to the lower DA....2.5mph & 4 tenths is definately going in the right direction George  

I'm thinking fuel delivery  

My old 446 made a lot less power than George's new stroker and it would still pull 115-116 mph at 4100 raceweight.  



Ron

i would agree on fuel ie tune issue ,timing ??