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[QUOTE=911st;5540427]Just a note, if 5 cylinders were at 11.5 AFR and one at 13.5 AFR a single O2 would probably indicate a safe 11.8 AFR.


That's why you would still need to read the spark plugs. Then you can detect the lean cylinder. Plug reading is a must for tuning any engine, wide band or not.
Old 09-03-2010, 05:08 PM
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Agreed.

I am not sure but I suspect there is an art to doing a 'reading'.

I think you are supposed to do a WOT run, shut the car down, coast to the side of the track, and pull the plugs for inspection.

If we just do this with our valve adjustment I suspect that things like a bad valve guide that is passing oil might show up pretty well (a solid contribution of detonation). However, if one had a injector that worked well at idle and cruse but is restricted at WOT, this might not show up or it might be to late by the time one gets to there next reading.
Old 09-03-2010, 05:28 PM
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Quote:
Originally Posted by willtel View Post
Very impressive. Your dinosaur is faster than the latest $400000 super car from Japan.

YouTube - Drag Race: 2012 Lexus LFA vs 2010 Nissan GT-R
Such a very amazing link!
Thanks you for the post.
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Old 09-03-2010, 07:35 PM
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Andy930:

Got to ask; were you able to do a burnout? These pups axle hop like crazy - what did you do?
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Old 09-08-2010, 10:42 AM
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Quote:
Originally Posted by 911st View Post
Agreed.

I am not sure but I suspect there is an art to doing a 'reading'.

I think you are supposed to do a WOT run, shut the car down, coast to the side of the track, and pull the plugs for inspection.

If we just do this with our valve adjustment I suspect that things like a bad valve guide that is passing oil might show up pretty well (a solid contribution of detonation). However, if one had a injector that worked well at idle and cruse but is restricted at WOT, this might not show up or it might be to late by the time one gets to there next reading.
On our turbos I would not shut down the engine right after a WOT run with our turbos spinning 100k+ rpm and no oil pressure. This method is fine for a NA car or a turbo car with a big oil accumulator.

Just making sure everyone is aware of this.
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Old 09-08-2010, 12:52 PM
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Hi Craig 930 RS. Yes, about 40feet before the stage lights there was some water on the pad. With slicks on and being wet the wheels spin easy,like let the clutch out at 1500RPM and they break loose. Keep them spinning just long enough for them to dry out and grab the sticky surface. I can assure you they wont break loose again,well at least with my power level anyway. Axle hop seems to be a problem only if the tyres break loose. Street tyres will break away causing that problem. Besides, a massive burnout in a porsche just doesnt seem to look right anyway...
Old 09-09-2010, 05:22 AM
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Andy, I managed a 1.77 60' friday night at the drag strip. The KEP stage 1 works beautifully.

11.79 ET
119mph

I kicked an LT1 Camaro and '05 mustang GT's butt out there.
Old 12-05-2010, 12:56 PM
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That's an awesome time, you're only .3 secs off a 997 turbo...

Do you have any idea what power you're making?
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Old 12-05-2010, 01:48 PM
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Last dyno showed 388 rwhp. Car and me just over 3100 lbs
Old 12-05-2010, 02:39 PM
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Egt

They need to make something like this in an AF/R gauge flavor:

WESTACH ENGINE ANALYZER
6 CYLINDER EGT KITS from Aircraft Spruce
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Old 12-05-2010, 04:00 PM
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Any more 1/4 results?
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Old 03-05-2011, 07:38 PM
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Red face

What I wonder is how the shifting is handled to get these great 1/4 mile times? Do you just keep the throttle pinned and power shift it, or let up, shift and then back on the gas? I'm assuming it's a rather abusive power shift! Do these cars have any kind of factory rev limiter?

Too, how does the tranny respond to really fast shifts? On my car, a quick 1st to 2nd wouldn't be too bad, but it's nailing 3rd that would be the trick .... I don't like the vague feel of the gate under normal shifting speeds.
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Last edited by Maxx1; 03-07-2011 at 06:01 AM..
Old 03-07-2011, 05:58 AM
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I don't power shift, I lift throttle on each shift..
Old 03-07-2011, 11:45 AM
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Congrats!!!! DR.

But, I think your nuts doing that to your car..

I like the 60-130mph.. Have you ever timed it etc.etc..

Walt
Old 03-07-2011, 12:55 PM
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I haven't done any 60-130 times although I would like to.
Old 03-07-2011, 01:13 PM
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Andy, nice numbers! Very encouraging for us cis guys. If you don't mind my asking, what CR are you running with those 3.4 Mahles?
Old 03-07-2011, 02:21 PM
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Quote:
Originally Posted by JFairman View Post
In the old days we removed the spark plugs and looked at the color. If you know how to do that it's pretty accurate.

To visually read the mixture in each cylinder more accurately at high rpms shut off the motor at high rpms, put it in nuetral and coast to a stop before removing and reading the plugs.
Wouldn't that be hard to do on a turbo car considering you are supposed to let it idle before you shut it of?? f... ... otherwise it sounds like a great way to see what your mixture is doing under hard conditions. I used to do this on my dirt bike.
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Old 03-07-2011, 04:26 PM
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Hi e170drvr, 7.5 to 1 is the c.r. Gear shifting is done in the normal fashion with out
slamming it in. Correct oil,gearbox temp and no worn syncro rings along with plenty of practice is how its done. cheers.
Old 03-07-2011, 11:23 PM
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Back to subject. I did few runs at the strip, not official times but performancebox and radar sniped 121mph-118mph and ETs were lowsy 13.8-14.5 cant get second gear when WOT?
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Old 09-06-2014, 09:24 AM
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Not good times but you are flying!! Can't get second as in bad synchros? Shift linkage getting miss aligned due to the torque?
Old 09-06-2014, 09:31 AM
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