October 2012 was to be the highest and lowest points of owning my celica all in one drag strip outing...
What an epic couple of days!
I knocked off work midday Friday and loaded the Celica into the truck and headed for Benaraby Raceway for a couple of days drag racing. I had decided to do both the Friday night test -n-tune as well as the Saturday race meeting due to having several changed parameters and wanting to creep up on a tune. New intake manifold, increased water-meth volume, and the 17psi wastegate springs back in all told me to expect a few runs worth of tuning before getting the best from the old girl.
First run out on Friday night was 14.4 @ 98mph struggling with one of the gears. I reviewed the data log and decided to put a size larger jets front and rear to bring the AFR's back to the mid to low 11's. Second run I blew off the brake booster hose on the burnout and the car didn't want to run right so I crusied the track and was relieved to find the problem so simple back in the pits. Third time out I gave it 3 degrees more timing and went 13.4 @ 102mph. I had a baseline to start with or so I thought. I was with a group of mates and we camped in the back of my truck after a BBQ and much chin wagging!
Here is the dear old girl in the staging lanes Friday night:
Here is the old girl chilling waiting for some action:
Saturdays action kicked off with qualifying in the stinking 30something degree heat... I ran a 13.9 @ 100mph and pulling out my turbo excuse book found the heat of the day most likely responsible... Next qualifier the car didn't sound right on the burnout pad and wouldn't come up on boost on the start line. It turned out the dizzy internals had slipped retarding the timing to around 5 degrees advance - damn well no wonder the car wouldn't come up on boost... A quick rework of the clamp and some wire to help hold and I then had to carefully rethink my ignition strategy in the light of not knowing exactly what had been base timing for previous runs... Third qualifier netted me 12.76 @ 110.90mph with a reasonable 1.76 sixty foot time having given it an increase from 24 to 30psi boost. This time gave me the top qualifier spot for Street bracket.
There was opportunity for a fourth qualifier however I didn't make it past the burnout :rolleyes:. I went to pull a larger skid just because I love skids. There was a couple of pops as I pedalled it trying to keep it off the rev limiter followed by an almighty bang and the bonnet jumped several inches! It seems the part throttle high boost scenario ran cylinders lean causing a backfire which attempted to launch the carb hat through the bonnet (there is a large dent now) ripping out the material holding in the retaining nut.

At this point I was going to pack the car away and enjoy watching the racing as there was also fuel dripping from the rear accelerator pump indicating the diaphram didn't like the pressure spike either... A group of mates came over and produced gaskets and diaphram for the holley plus a large aluminium washer to attempt repair of the broken carb hat. After a couple of goes we got the hat to retain boost while testing on anti-lag so I was able to front for the first round of racing!!!
Repair:
First race I had a bye run and since the carb hats unfortunate incident and subsequent hasty repair I lowered the boost back to 24psi and gave her a couple more degrees timing. The time was 12.92 @ 109mph with a 1.67 sixty footer thanks to anti-lagging the launch. As the carb hat was still intact I gave it 30psi boost for the next run which netted me a breakout loss with 12.35 @ 112.66mph with a 1.61 sixty foot time! The run felt good with the car behaving nicely. Since all was still well with the carb hat I turned the boost knob up once again - it was either that or give it some more timing as it was still a little sluggish in the mid rpm range! Third race the car rolled the beam on the start line as I was anti lagging it (I knew it moved but the stage beams were still on) and hence a time card of 13.8 @ 115.5mph with a registered 3.352 sixty foot even though it left like a slingshot! If the sixty foot time had been the same 1.61 as the previous run and discount the extra 3mph then it should have been a 12.06 et minimum... There is always the one that got away...
http://www.youtube.com/watch?v=p0RU3j7yr7I
I was dirty with myself at the mistake so asked the meeting director if I could have another run once the finals were finished. Now I had not thought to take a glance at the boost gauge for the previous couple of runs so I can only hazard a guess as to what the boost may have been after winding more in again for this final run (north of 35psi). The car felt absolutely menacing this run as though it were out to eat me. The data log and the 60ft time of 1.63 both show some wheelspin off the line and from there it was the one of the wildest passes I have had bar none! I was fighting to keep the car in my lane while it was snaking first one direction then the other. Gear changes (all of them) unsettled the car nastily. My head kept saying get off it but my right foot was clamped to the floor with adrenlin. The tail was drifting somewhat controllably as I shifted into 4th and then all went quiet... I didn't think to put the clutch in or shift neutral but still ran 12.2 @ 96mph. Rounding the exit lane I stabbed the throttle a few times trying to see if there was life and was rewarded with the sound of gravel in a mincer. I knew what would be waiting so I popped the hood and looked around with my torch and found the newly created inspection hole is at the passenger side at number 1 cylinder position.
RIP the little 3TC that could.

I know I was being a little unjust this weekend as I just kept pushing the boundary so I feel a little guilty as though my dear little engine deserved better...
I'll do a post mortem and put up the findings some day but right now its somewhat fittingly a gloomy rainy day and I don't have the motorvation to unload the truck and get started.
Of course I'll build another bullet and go again, however I'm going to have a careful think about just how much better to build it. The way the car itself behaved with my last twist of the boost knob I believe I have found the limits of chassis and suspension - that is without spending money hand over fist on what is my daily drive with a sideserve of fun. The 115mph tune is well and truely enough for a mid 11 second timecard if I could convice the gearbox to accept nasty ripped flat shifts and the car still ran straight so I feel to build the engine with this as my goal post for reliability. Forged pistons and rods are a no brainer and cheap insurance but I think there will not be any need for serious changes to the combo at all.
Cheers,
Jason