Nats failure

AllKiller · Post by **AllKiller** » Tue Jul 30, 13 6:55 pm

Well after changing my cam yet agin to get the 11 I know is in the car

I just broke into the 12's with an off the trailer 12.9 @105 it looked promising ...car has run a PB of 12.4 @109 on the motor alone
and 12.00 dead @ 118 and 121 on the drugs

But after 3 attempts of 13.0 @ 103-102 I started to lose faith
Comp cams recommended a cam saying it would put me right in the ball park of 11's with my engine/trans specs

My 60's are 1.8 same as ever, not great.... I might have been launching at to low rpm and I was shifting at 5800/6000 cam does go to 7K as my Cuda regularly does

So whats going on feel free to voice your opinions before im swinging from the rafters in my garage

Even letting my Son Harley have a go 3 times netted no better time 13,1x 2 and a 13.00 in his VERY FIRST EVER drive in the car ....he had never driven the car until the journey down the fire up road

Crower cam 12.4 with a 575 585 lift. 265 267 dur @ .50
Comp cam 12.9 with 540 558 lift 252 260 dur @.50

Pete · Post by **Pete** » Tue Jul 30, 13 7:01 pm

I think it pays to have a drink or two before you tie the knot and jump off...........

For a 383 the shift point sounds very low, but then again I tend to batter any engine.

It will lack torque over its bigger cousin, so your only recourse (other than the drugs) is to spin it up more....

Mossy68 · Post by **Mossy68** » Tue Jul 30, 13 7:02 pm

Bloody sure I see you run an 11.7 on the euro dragster web cam ????
I was delirious due to a week of no sleep and excessive alcohol though.
Nope. Swear that's what I read. I noticed it more cause it showed your mma number !

Pete · Post by **Pete** » Tue Jul 30, 13 7:02 pm

...and I assume you were holding it on the convertor as opposed to flashing it?

What happens when you try the latter?

Mick · Post by **Mick** » Tue Jul 30, 13 7:03 pm

What are the full engine specs, converter, rear gear, weight etc ?
Mick

GTXJim · Post by **GTXJim** » Tue Jul 30, 13 8:02 pm

I would have stamped on the gas and shifted at 6500, 383's need to rev. What are your gear ratio's, tyre height and stall?

AllKiller · Post by **AllKiller** » Tue Jul 30, 13 8:27 pm

I flashed it at around 1500...I think I should have pushed 3K and hit it also I think I was short shifting...couldn't remember cam spec

but I didn't abuse it like I normally do ?

Bananarama! was an 11.7 mate send me the link i'll check

No drugs used as my fuel solenoid went Capput due to not being used for 2 years

Cannonball · Post by **Cannonball** » Tue Jul 30, 13 8:29 pm

AllKiller wrote:I flashed it at around 1500...I think I should have pushed 3K and hit it also I think I was short shifting...couldn't remember cam spec
but I didn't abuse it like I normally do ?

Bananarama! was an 11.7 mate send me the link i'll check

No drugs used as my fuel solenoid went Capput due to not being used for 2 years

blinkin eck steve thats tickover stall, told ya i wanted to hear it scream,

AllKiller · Post by **AllKiller** » Tue Jul 30, 13 8:29 pm

Jim its a JW 3800 stall 4.10s 28 x 10 slicks 114 race fuel 12.5 comp motor

anything else that might help ?
damn heavy car too 3600 with me in it

AllKiller · Post by **AllKiller** » Tue Jul 30, 13 8:30 pm

Dunc yeah I F***ed up this weekend big time..heat and hayfever got to me

AllKiller · Post by **AllKiller** » Tue Jul 30, 13 8:31 pm

Cannonball wrote:
AllKiller wrote:I flashed it at around 1500...I think I should have pushed 3K and hit it also I think I was short shifting...couldn't remember cam spec
but I didn't abuse it like I normally do ?

Bananarama! was an 11.7 mate send me the link i'll check

No drugs used as my fuel solenoid went Capput due to not being used for 2 years
blinkin eck steve thats tickover stall, told ya i wanted to hear it scream,

It did scream in the burnouts though

Pete · Post by **Pete** » Tue Jul 30, 13 8:40 pm

I think you have got to wring its neck, Steve.

Without the extra cubes and resulting Torque it sounds a tall order, especially as it is quite a heavy car.

I am sure you do not wish to keep throwing money at it, but maybe a 440 source 383 stroker unit could be an answer if you want to retain the existing block - unless you are close to completing your big stroker...

AllKiller · Post by **AllKiller** » Tue Jul 30, 13 8:55 pm

agreed mate...
Stroker next.. Pete might wring its neck at the HRDs then do the swap

go 505 as planned

Mossy68 · Post by **Mossy68** » Tue Jul 30, 13 8:58 pm

Don't think you can review a live stream Steve ??
Couldn't see lights at end of strip but time came up at bottom.
Prob the car next to you !!!

( must keep taking the pills )

Dave-R · Post by **Dave-R** » Tue Jul 30, 13 9:38 pm

Did I read this right? You fitted a SMALLER Comp cam and expected to go quicker?

The Crower cam (your previous cam?) was about the same lift but more duration than my old cam.

Crower cam 12.4 with a 575 585 lift. 265 267 dur @ .50
Comp cam 12.9 with 540 558 lift 252 260 dur @.50

My old cam was 0.570 intake/0.579 exhaust lift and 237/242 degrees duration @ 0.050". Much less duration for the same lift.

It still was not quite enough but 12.2s were regular and I did run an 11.9 once. When the engine was Bananarama! actually ran 12.2 on it's first ever run on the BFG Radials.

But I think several things went a bit poor in the engine after that.

My best 60fts were done from idle on the lights and just mashing the throttle. Converter used to flash up champion and a good pump shot and mechanical secondaries ironed out any suggestion of a bog.

I shifted at 6500rpm but the cam duration actually called for it to be a bit higher. You need to shift past peak HP so that on the gear change you are making an equal amount of power as you were at the shift point. So you are only using the peak of the HP curve.