1979 RX7 + JY LS 5.3 + S400SX3 (75mm) = 9.66 @ 144. (Street Legal)

[meaclez]

didnt he go 8.80s?

 

[forcefed86]

8.68 @ 164mph

 

[forcefed86]

Made the 8's!


New best... 8.93 @ 153. Boost peaked at 25.8lbs. 22-23lbs through most of the run.... 15* of timing.

Went to make a final pass and the car died on the line. Did the burn out fine, hit the T-brake and made about 15lbs, and it shut off. Something locked up, not sure if its motor or trans/converter yet. Had to tow it home.

Oh well, had a great year!

 

[forcefed86]

So maybe I should have sprung for a new timing chain... Looks like the chain let go. Destroyed everything in a hurry. Even took out the cam, block and heads!

Already have 2 replacement motors ready to play with.

Got the new heater installed, ready for winter!

Choices choices.... at $500 each I had to buy them both! 2008 5.3. Alum block even.... And a 2006 4.8.

 

[forcefed86]

The 2008 Alum. 5.3 I picked up for $500 had a slight miss according to the previous owner. He said he hoped it was a coil pack but swapped out coil packs with daily driver and they all tested fine. He didn't trouble shoot any farther.

Looks like the #1 cyl was oiling up the plug or not firing for one reason or another. Pulled the motor all apart and didn't find anything horrible. I should have checked compression on that cyl but it's a little late now.

Other than that it looked great. Took all the DOD (Drive On Demand) junk off. Seems simple enough. All of the lifters were in great shape. Looks like the DOD is only on the inner cyls so faulty DOD can't gum up the #1 cyl.

Heres a good plug compared to the #1.

Fancy 243 heads (aka "the good ones")

DOD junk (I'm eliminating all of this with a 2008 4.8 valley cover $28 new from GM)

 

[TURBOPOWERED68]

8.93 @153. Driven to and from the track.

Basic run down...

Chassis

79 rx7 back halfed.
Currie 9 inch with 35 spine moser axles and spool 3.10 gears 29" tires.
competition engineering ladder bars
Front factory struts with power disk brakes


$220 junkyard 5.3 (all orig fastners on rotating assy)
Rings gapped at 26/29
ARP head studs
LS9 GM MLS HG's
Cheap OEM ZR1 Cam
PAC 1218 valve springs.
317 6.0 heads. (slightly hand ported by myself, OEM pushrods)
AEM EMS PNP
120lb injectors
Magnafuel 750 pump
1/2 fuel lines
E85 Fuel
Power glide. PTC 9.5" converter
BW S400SX3 turbo. (75mm) 1.10 AR T4 exh. housing.
Turbo kit consists of stamped SS 98 F-body manifolds. and 2.5" Mild steel piping.
Cheap 12x32x4 Ebay intercooler

9.66 @144 is the best so far only had it to the track twice. Lazy 1.5x 60'. 17lbs of boost Never reved over 5400rpm!

(Will add pictures soon, exceeded my bandwidth on photobucket for the month)

to read it

 

[forcefed86]

4.8 short block all cleaned up and ready to go. Waiting on my degree wheel to arrive so I can double check the cam. Can't believe the amount of carbon and crap that builds up on these pistons. Cyls/bearings all looked great. Gapped rings to 20/24 and slapped everything back together.

Takes more time to clean everything that it does to assemble the motor.

Tore the old motor down as well. I don't know if my oil pickup was being uncovered or not. All the bearings with the exception of the #6 rod bearing looked great. The #6 was eating itself. Not sure why. It looked great when I assembled the motor.