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Dr. Jeff Harper

Supecharged 1UZ Project

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Friday, April 23, 2010 at 6:35PM
I ordered a pair of Mickey Thompson 11.00X28X15 drag slicks about 5 months ago and they finally arrived (sea freight). You have to plan in advance if you want to drag race in Thailand.
These Mickeys are a great fit for my race truck. The Goodyears are available here in Thailand in a similar size (10.5X28X15), but that particular tire happens to be for a heavy Super Stock drag car (stiff sidewalls), not my little 800 kilo thing. I would rather run Goodyears, but . . . . . they cannot make a drag slick for EVERY car combination.
These M/Ts combine for 23 inches of width. Nice.

The progress part: I have been in pretty steady contact with my shop guys and although the progress has been far from swift, it seems like all issues have been sorted. The starting and idling issues related to the fact that the Subaru injectors DO FIT the 1UZ intake manifold, but they do not fit well. . . . the rubber swelling issue is prevalent no matter what gas you use. So, the fix is to make some small aluminum "washers" top and bottom of the injector so that the rubbers are held firmly in place (the lower washer) and also to make sure the injector does not get jammed too far up into the fuel rail (the upper washer) to compress the rubbers so they have no room to expand (like the standard 1UZ injectors). I discovered this from other 1UZ racers here. What a hastle . . . but necessary. They do not suck air around the injectors now . . . and they will not allow boost to blow out either. With that done the thing starts up immediately, but still wouldn't idle below 2500 rpm . . . what's up? After a long search the throttle shaft of the throttle body was found to be so loosely fitted that it sucked gobs of air in there. I have a better, high quality throttle body to fit now. These little details . . . flaws of quality, have cost me a lot of time. So now I am only waiting for a day when I am off work and the dyno is open at the same time . . . . and I am not on vacation! That day looks like May 3, 2010.Wish me luck.


Last Saturday night we cranked up the little blown 1UZ HEMI for the first time. WOW, what a sweet sound! We had a couple of small sorting-out issues (a little oil weeping from here and there requiring tightening), and an oil pressure gauge not working (we pulled the oil line to confirm oil flow and pressure). Using the super-duper GT Unleaded Racing Gas (115+ octane rating), we didn't get a final tune in the ECU because the header collectors are so short we could not get a stable O2 reading, and there appeared to be a vacuum leak which yielded novel tuning outputs. Some collector extension pipes are being made this week (for tuning purposes only), and new rubber grommets for the injector bottoms are being fitted (the source of the vacuum leaks, we believe). We will go at it again this Saturday at noon . . . and hope we can run in that night's big program.
Art and his 'crew' from Voodoo Racing Inc. in Pattaya, Thailand were on hand Saturday night to trouble shoot the initial start-up. They did a good job.

Update on Tuesday, December 1, 2009 at 12:03PM by
On Saturday night (Nov. 28, 2009) we thrashed the little HEMI to get it running so we could race. But it was not to be: my 1UZ would not start and run properly - so no tuning map yet. We chased what we believed to be a coil wiring flaw, but ended the evening suspecting the fuel injectors (more than one) were hanging open causing the starting and idling problems: we were drowning the plugs. We did accomplish something: the 7 pound blow off valve sprng arrived and it was installed. There was a large crowd on hand to see the first NITRO funny car in Thailand (it smacked the wall right off the starting line), and this crowd eventually filtered around to my shop to stop in and admire my race car and the new V8. Oh well . . . "if you can't go fast, at least look good." I hope that is not going to be the theme of this race car. I am sure it will not be . . . I may have pop for NEW, and expensive injectors. Oh well.

Update on Saturday, December 5, 2009 at 10:34AM by
I spent another frustrating evening not getting my 1UZ to run. It popped, banged, and threw burning fuel out the header and onto the floor! Now that the injectors have been checked out as OK, it looks like I am back to the "coils are wired wrong" theory. I will have to get my tuner and the electrician at the car at the same time to sort this one out. I hope we didn't hydraulic the motor in the process. I had some time to take some nice pics though.
Details, details, details
High Tech air filter - designed to strain birds and large debris out of the high speed intake air column.
Looks good -- won't start, I got dem ol' new car blues!

Cutting edge air filtration technology pioneered by my friend John, a.k.a. 'The High Road Skulker'. It also doubles as handy track-side food strainer. Helpful hint: tell your wife prior to borrowing kitchen appliances lest she sees photos on your web page. Yes Dear, I'll take that trash out right now.

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