60 ft blues

[Tim Hensley]

first pass

[Steve Wood]

Tim, which wide band are you running so I can set up PL, and how tall are your tires so I can figure the speeds (I assume you have not changed the speedo gears)...thanks

[Tim Hensley]

AME  tire is 28 X9-15 pro bracket I think the log showed 3 mph slower than slip

[Tim Hensley]

AEM my bad

[Steve Wood]

The mph is kinda strange.  It's only a couple percent off and it should be closer to 8%.  It reads like my car did with 28 inch tires and a 27 tooth speedometer gear instead of the stock 30 tooth gear.


The short time is slower than I would expect, but, it may simply be the track prep.  I don't know how sticky the track is and that makes all the difference.  Looks like the tires are breaking loose a little right after launch according to my look at the mph/rpm curve bump.


The top end mph is probably about right because you are not running very high boost and the car looks rich to me.  If it were me and I was looking for more performance, it would set it to 27 psi for a look.  The boost control is still a bit wonky at launch for some reason.  Kinda wonder if that comes from a bit of wheel spin that drops the load on the engine a little for a short time.


Given the above, I don't think I see anything really wrong with the run, or the car.  It's probably running about right for the boost level.


Not knowing anything about  your local area, is the humidity high?

[Steve Wood]

one thing I just noticed (if I calculated right) zero slip in the drivetrain should have given you about 131 mph...  or about 11% slip.  I guess that is not that bad after thinking about it.  Probably cost a lot to get much less. 

[Tim Hensley]

Thanks for your kind words
Speedometer is close 255 -60 tires and the radar speed limit sign is 1 or 2 mph off think I have a 27 tooth. It’s a Turbo smart controller I can probably tune that spike out , might go away if i turn it up to 27.
Yes that pass wideband correction is 10.8 last pass 11.0 slip looked the same just 1 mph slower at1/4 and 1/2 mph at 1/8 mile
Hawai’i is humid 60% today I think it was over 50 on Saturday track is close to sea level temperatures 85 88 max.

[Steve Wood]

humidity never helps as it takes up some of the room that air molecules could be occupying but that is not too bad.  Long ago, you said Lonnie or someone said bump up the stall and that would help because it would probably like leaving at more boost and rpm, but, I would practice driving and being consistent since you are not contesting anyone in particular.  Enjoy the car for awhile 

[Tim Hensley]

Always good advice on this form. Enjoy the car is just what I’m going to do.

[Scoobum]

You have to flash the convertor to 3900 minimum to get into the 1.5's. Bring up the gauge panel on PL and have a look. Go one frame at a time until the MPH moves to 1...and then go back one frame at a time till hit hits zero...then look at your RPM's.

[Scoobum]

Looking at your PL file you only flashed the convertor to 3025.

[Scoobum]

And your low gear fueling is in the 870's. You need to drop it to around 780. I'm gonna write an article on how to launch these cars with no money.

[Tim Hensley]

Thanks for taking the time to look at the logs.
It’s definitely rich at takeoff,Alky is spraying like mad.
I have a log with Alky off it was low 800 same 3000 rpm
Do you have any theory  why RPMs do flat just before the 1-2 shift?
Been down the last two track sessions going next week,setting takeoff boost to 15 lb and try to hold 3100
Looking forward to your article

[Scoobum]

Julio has his default alky start spraying at 6 psi and you left at 11 psi. Alky is a fuel...so it's prolly bogging the engine down at takeoff. These engines rolled off the assembly line running 14 psi with straight pump gas. Julio has an adjustment for the turn on point...and also for volume. When I ran my SMC kit I had it coming on at 12 PSI...dependin g on how accurate the knob was.


What turbo are you running...what size exhaust housing...and journal or BB? What convertor is in it...and what's the stall rated at. We'll start with that.

[Tim Hensley]

1 5857 .63 af precision ballbearing
2 Lonnie at Extreme Automatics’s,converter rated 2800 I think it a little higher none locking