Drag Racing Questions - Page 2

gtfpv · 16-05-2006, 11:04 PM

Quote:

Originally Posted by Chris

Firstly everyone, sorry about the late reply's, but bear with me, i will get to everyone.

The 1/78 difilippo is not a trick - just smart engineering. Modern engine building theory tells us to use the smallest primary to do the job, build up airspeed and increase scavenging.

So why go the 1 7/8??

Modern theory does go out the window when you have a unique, somewhat hybrid engine in a very narrow engine bay. The airspeed lost by going to a larger pipe is more than made up for by the larger cross sectional area at the head flange. If we were talking hot rods, where you could run a pipe straight off the head a few inches before it turns, you would be more confident with the smaller primary. However, the BA is very limited in its space, and loves the 1 7/8 pipe.

We notice that we run faster down the quarter than our closest rival in ET and MPH, and we run a 4:1 and they i believe are using a try y.

Thats good enough for me.

Editing the cars will make improvements over each mod, so it is recommended that a competent tuner aid you in editing each and every step of the way, to maximise efficiency.

thanks . that explains a lot now i understand , its not just try y's versus 4:1s but the right size as well . cheers.

Craig · 16-05-2006, 11:13 PM

Quote:

Originally Posted by DABOSS

Put an Auto into craig, Then take the rear part of the exhuast off and drive it down melton Rd. :evilsasmo

Well mate i now have a new clutch and the exhaust is all gone from the headers back, it's a semi drag car this weekend.....

DABOSS · 17-05-2006, 08:35 AM

Quote:

Originally Posted by Craig@ACE

Well mate i now have a new clutch and the exhaust is all gone from the headers back, it's a semi drag car this weekend.....

Nice.

ratter · 17-05-2006, 08:49 PM

Quote:

Originally Posted by Noddy

What sizes can you get the mickey t in?

SOFT DRAG TIRE COMPOUND FOR SUPERIOR TRACTION ON THE DRAG STRIP

RADIAL CONSTRUCTION FOR EXCELLENT RIDE CONTROL ON THE STREET
D.O.T. APPROVED, STREET LEGAL
LOW VOID DIRECTIONAL TREAD PATTERN ELIMINATES FEATHERING
SPECIAL SIDEWALL CONSTRUCTION FOR QUICK LAUNCHES

P235/60R15

P275/50R15

P255/60R15

P275/60R15

P325/50R15

P295/65R15

P315/60R15

P255/50R16

P275/40R17

ratter · 17-05-2006, 08:54 PM

Quote:

Originally Posted by Craig@ACE

Well mate i now have a new clutch and the exhaust is all gone from the headers back, it's a semi drag car this weekend.....

I predict a new 3 valve record this weekend:dr_Evil:

AUSGTI · 17-05-2006, 11:44 PM

Quote:

Originally Posted by Chris

Jase, i would recommend using just standard "auto" mode, as when my car was in the same "trim" as yours, it seemed to work the best.

As for the launch, be wary of holding the ION 4 spd on "stall" for too long, as they rapidly build up temperature.

Tyres, well all different cars with different setups require differing remedies, but i remember kwinana to have a nice startline. I would agree and say persist with 28-32psi, see what works, maybe avoid excessive burnouts, maybe 1st, then 2nd until you see the "haze" (that is, haze, not cloud), then let the car roll forward with your foot nearly right off the gas until you feel the tyres bite with a little screech. Guys around here manage 60's in the 2.0's using this method.

Err on the side of more than less PSI, as a flatter tyre will take more HP to turn.

Thanks for that mate, i will give it ago next wednesday... I managed a 13.8 tonight still with a 2.2 60 foot still with 32psi. I am aware of the rapid temp increase from stalling, so yeah im trying to avoid it.. There will be a tranny cool fitted at the next service soon. Will let u know how i go!!

Cheers

**Chris** · 18-05-2006, 08:40 AM

Quote:

Originally Posted by In2Xr8

Thanks for that mate, i will give it ago next wednesday... I managed a 13.8 tonight still with a 2.2 60 foot still with 32psi. I am aware of the rapid temp increase from stalling, so yeah im trying to avoid it.. There will be a tranny cool fitted at the next service soon. Will let u know how i go!!

Cheers

Good luck mate - next time we speak, i'll dig up some timeslips for my ride when it was in same config as yours, we'll compare notes.