LSX / Supra classification

[yarp]

I can't find your previous post about the pumps. what RPM are you getting cavitation issues at?

[dw230]

2.5'(feet) of exhaust clearance should be plenty. Almost Tropy Truck territory.

DW

[redhotracing]

I can't find your previous post about the pumps. what RPM are you getting cavitation issues at?

6,200+ for prolonged periods (back when we had 3.42 gears)
can cause cavitation. We are under-driving the pump and run
2.47 gears; we're over for 6K for short blips 1st through 3rd
then going through the traps at 200+ mph. The pump being
under-driven can take nearly 7K now without issue, but like
I posted before, that's not advisable on a stock LS motor.

2.5'(feet) of exhaust clearance should be plenty. Almost Tropy Truck territory.

DW

No kidding, Dan. Surely he meant 2.5" but still funny. Ohio and Maine
are smooth enough, that should be plenty. Maxton? You would still
drag here and there 

[greenjunk]

what does gear ratio have to do with pump cavitation?  was it the acceleration of the motor doing it?

[redhotracing]

what does gear ratio have to do with pump cavitation?  was it the acceleration of the motor doing it?

Taller gears -> we're lower in the RPM range in 4th gear with the 2.47 gears.
LS1/T56 and 3.42 gears we were pulling higher revs for longer durations. Now
we hit 200mph right at 6,000RPM in 4th gear. Even 220mph is right at 6,500.

[yarp]

2.5'(feet)

shazbot, didn't catch that

*snip*

that still with a t56?

[redhotracing]

Our T56 would've died long ago. We got
a great deal on a rebuilt Jerico RR4 and
Lakewood bellhousing, Dave (greenjunk)
hooked us up with a Quartermaster 7.25"
clutch.

Clutchless shifting = BLISS 

[yarp]

I look forward to meeting you guys.
you've all been very helpful.

[redhotracing]

I won't be there til the July meet, but Dave
(green junk) will be trying to win the HRM
jackets... Best of luck to them and all of the
racers this weekend.

[gkabbt]

I won't be there til the July meet, but Dave
(green junk) will be trying to win the HRM
jackets... Best of luck to them and all of the
racers this weekend.

Luke, To bad your not here this weekend. Your -20 suit would feel REAL good.....Kinda chilly here!
I left NC this morning wearing a t-shirt and shorts and rapidly changed as soon as I got to the hotel! LOL!
Here's hoping the Maty boys will repeat for the HRM jacket!
See you guys in July!

Gregg

[redhotracing]

You too, Gregg! Pop by WS on your way home
if you'd like. Have a great weekend in Ohio!

[yarp]

121.1306

She was bouncing off the rev limiter for the last 1/8 mile in third gear and never saw overdrive.
Melted down the fuel pump relay...lol
I had to steal one from Joe Grier to get home. Hope I can contact him and return the part or favor somehow.
Guess I have to get control of this 4l60 and see what she'll really trap.

Thank you, everyone.

[gkabbt]

Joe, 121.1306 is a good start.....Unfortunately, now you are hooked so get ready to spend some money! 
I got several pics of your car and the links are in the 2014 Kickoff thread under ECTA General Chat.
Gregg

PS
I'm the old dude with the moustache that talked with you several times Friday and Saturday.

[1leg]

With the stock LS pump the thermostat is in the inlet of the pump causing a restriction to the pump. Something to try is removing the thermostat and plugging the bypass port. This may help your cavitation issues.