launch comparison

The first video is with about 10% nitro and 4:30 gears. 1.13 60' 5.16 ET 7440 rpms.

The second is on 100% methanol and 4:86 gears 1.11 60' 5.15 et 7260 rpms. This the same track 2 weeks apart on passes , weather very close but a little better air on the nitro pass.

we'll need a 10% nitro with 4.86 gear to compare. converter likes the 4.86 gear better looks like,or maybe it dont like nitro.

Either a 10% nitro/4:86 gear tnt, or a 100% meth/4:30 gear tht under similar weather conditions would probably be the next step an "A-B-C" testing.

It's not an apples to apples comparison but I wonder what gear direction & nitro percentages the injected nitro dragsters running in the top alcohol dragster classes are using?

I have no idea Dave , but they are probably running a clutch where they can manage and keep the added torque.

800 ft lbs of engine torque on methanol with a 10 % mixture increases roughly to 848ft lbs, 12% to 857 ft lbs and 20 % increases to 898 ft lbs. I would say 20 % would act close to a 200-250 hp shot of nitrous , that kind of load might need a dedicated torque converter.

did the mph change any? the 4.30 will load your converter harder anyway you look at it so 10% the 4.86 is worth a try.

Lee ,the mph only changed less than a mph . I got to slowly bring the high speed in on the nitro because that tuneup is a little rich on the top end.

you may need a converter adjustment for the nitro tune. the way your hot rod moves out you should put a 10"converter in it so it'll calm down some.

cool40 wrote:you may need a converter adjustment for the nitro tune. the way your hot rod moves out you should put a 10"converter in it so it'll calm down some.

Lee I have been saying that his converter is wrong for years... this just proves it with that much of a change it should have made a heck of a notice in ET and MPH it almost did nothing so that says his Engine is over powering the converter

Coug the 60' is what slows with the 4:30 gears its just the simple law of physics and forces being applied from different ends of the drive train and how they react and work together.

The big question is what is the circumference of a 105" tire at 135 mph ? That is a huge change in what the converter sees on the big end and the nitro or m-5 is the direct cause of the rpm increase at the finish line not the gears.

I am not saying it might not could use some tweeking , but there is a lot of load placed on a converter from aerodynamic and gearing forces . If it was simply overpowering the converter it would shift into high gear before it got off the launch pad .

KY....call me....I'd be proud to have lunch with you

Where we going to eat at

the Coug wrote:

cool40 wrote:you may need a converter adjustment for the nitro tune. the way your hot rod moves out you should put a 10"converter in it so it'll calm down some.

Lee I have been saying that his converter is wrong for years... this just proves it with that much of a change it should have made a heck of a notice in ET and MPH it almost did nothing so that says his Engine is over powering the converter

Coug i was just fun'en with KY about a 10"converter.i do think with the nitro he could use a little tighter converter,kinda like you'd do with a nos car.hard to say for sure but he's got a damn fast ride as is!

One can always try the hygard hyd oil to snug the converter up a tad, it aint much much its a cheap easy test to see what it wants.

when i went from the cui brand hyd oil AW-32 to the hygard i didnt see mutch differance.sence then i have seen cui AW-68 hyd oil should be heaver wt if i need to tighted up my new 9.5 converter some in the future im going to try it.