Just need a bit more

[ozzymaxwedge]

Hi all,
My son and I have a 70 4 door Aussie Valiant that we drag a bit, at the moment we are setting up for our Australian version of your Drag Week, ours is Drag Challenge.
the event will be end of Jan over 5 race days with over 1000 miles of street in it. We last done the event in 2019 and finished 2nd in class just, so looking for a bit more.
The class we run is Small 9" Radial Naturally Aspirated Street registered.
Car is 3650 lb and runs 1.40 60', 110 mph 660' and 9.82 136 mph. 528 wedge, 12.6-1 KB, Molnar crank, 360 cfm indy sr's, 280 108 with about 700 lift solid roller with Huges 1.6 rockers, matched Indy tunnel with 2 new 950 APD carbs.
Gearbox is kitted 727 with a good TCE 5000 convertor, 3.5 gears, it flashes to 5000 rpm off the foot shifting at about 6800 and traps at 7000. All this is fresh.
Can anyone see some improvement to be had ? We Know there is a few guys running in 70's and would love to keep up with them.
Will put pics up next post.

Cheers

 

[ozzymaxwedge]

 

[RemCharger]

Might have to re look at shaving some weight?

 

[GTX JOHN]

I would experiment with total timing to see if
it would tolerate a bit more. Carb tuning and
maybe where cam is put in at. Also shift points.

Do you have a racepak or any data acquisition
system on board?

 

[ozzymaxwedge]

Might have to re look at shaving some weight?

We just can’t see what area’s, sort of need everything

 

[ozzymaxwedge]

I would experiment with total timing to see if
it would tolerate a bit more. Carb tuning and
maybe where cam is put in at. Also shift points.

Do you have a racepak or any data acquisition
system on board?

Have done the timing many times, likes 37 , we are locked at that.
Last time out we picked up 1 mph with some extra jet, we have an Innovate dual 02 sensor gauge sitting around 13-1 most of the track. This is as highly tech as we get

 

[ozzymaxwedge]

This were the cam was put

 

[dvw]

More gear and a looser converter will get you there easy.
Doug

 

[BSB67]

What a cool car!

 

[GTX JOHN]

13:1 is pretty lean. I would try 3 or 4 steps more jet?

 

[ozzymaxwedge]

More gear and a looser converter will get you there easy.
Doug

OK Doug you have my attention. Can you elaborate ? So more gear as in go to 3.7 from 3.5 ? Converter go to 5500 from 5000 ?
We did have 3.7’s in it but was trapping at nearly 7400 so went with 3.5.
Give us some numbers please Doug.

 

[rumblefish360]

Was there any ET difference between the gears?

 

[ozzymaxwedge]

Was there any ET difference between the gears?

Sorry.
Well it ran 9.92’s with the 3.7’s but to be fair we have changed jetting since the gear swap as well

 

[dvw]

OK Doug you have my attention. Can you elaborate ? So more gear as in go to 3.7 from 3.5 ? Converter go to 5500 from 5000 ?
We did have 3.7’s in it but was trapping at nearly 7400 so went with 3.5.
Give us some numbers please Doug.

No way it should be at 7000@136 with a 3.55. I'm assuming it has a 275 MT radial? i'm guessing 89"cicumference. They have close to zero growth. That puts it over 17% slip. Part of that is not enough gearas it's probably still accellerating well past the 1/4 mile finish. More gear will actually lessen the slip. However the converter itself may not be very effecient. What RPM does it fall back to on the shift? I would've never believed my 15-1 580" motor would need a 6200 converter to run its best.
Doug

 

[ozzymaxwedge]

No way it should be at 7000@136 with a 3.55. I'm assuming it has a 275 MT radial? i'm guessing 89"cicumference. They have close to zero growth. That puts it over 17% slip. Part of that is not enough gearas it's probably still accellerating well past the 1/4 mile finish. More gear will actually lessen the slip. However the converter itself may not be very effecient. What RPM does it fall back to on the shift? I would've never believed my 15-1 580" motor would need a 6200 converter to run its best.
Doug

Doug we are only on a 235/60/15 so more like 26” or 81.5 circumference

 

[dvw]

Doug we are only on a 235/60/15 so more like 26” or 81.5 circumference

Ok that makes more sense. Then the gear is close. I'd bet there is something to gain in the converter though.
Doug

 

[ozzymaxwedge]

Ok that makes more sense. Then the gear is close. I'd bet there is something to gain in the converter though.
Doug

Ok so do you think I talk to the converter shop about something with more flash ? Like 5500-5800 maybe ?

 

[dvw]

Converter guys are smarter than me. But I'd bet 5800-6000. Someone there can make you the proper piece.
Doug

 

[Tex013]

FIDDY SHOT !
that should fix it Al .
Weight seems a little high , is that with driver ? My Satellite is 3643lbs without me , 3790 with . Thats with a World heavy iron block . Glass bonnet , front bumper heater/demister and no rear seat . You should have a race seat , aluminium ?
TCE are ok , so talk to them .

Tex

 

[ozzymaxwedge]

OK Doug, thank you, will talk to them today
Hi Tex, hope you are well, we are only playing naturally aspirated mate , NA 235 Radial and yeah we are with TCE