That thing sounds nasty!

Doug

 

Not to stir anything up but I was talking with a group of friends last night about low timing. Your car came up along with a couple others. One guy said, the combustion process isn't complete yet, too little of timing, blowing it out the hole, Im surprised he hasn't melted an exhaust valve out of it yet.

So I was cruising through your thread again and saw that you infact melted an exhaust valve. Im interested in any comments from Martin / Tick Performance as to what caused it??

 

I did not melt an exhaust valve, I bent one. I destroyed a plug with detonation and the the remainder of the plug bent the valve on the way out and also damaged the turbine wheel. I was on 15* of timing, 18 psi and MS109.

I am running 13-14* right now. It is not super high, but there are guys running less.

Mike

 

Oh I read this post of yours, must have missed another post?

I was curious on what fuel, MS109, thanks!

 

Not sure. I really cannot say what happened on the pass either, because I was not datalogging. I can tell you one thing, the car was not rolling coal on those passes. I think it leaned out on the oxygenated fuel, got too hot and detonated. That killed the plug, completely removed the porcelain, and the rest is history. I had terrible electrical issues back then as well, but I have cured them all. I don't expect a repeat of that experience.

Mike

 

*HUG* your 8 sec pass is in the very near future mike. you got this.

 

LOL, I hope so. I do have a slip that says I went 8.75....if you want to believe it.

Mike

 

that abortion of a slip dont count your making the power just need to get legit back to back runs.

 

We have ran VERY low timing and never melted an exhaust valve, talking sub 5 degrees on quite a few hits on different cars.

 

I've always run really low timing too . But only on Ls engines .

 

john and martin are all about the slam timing train lol

only until recently they joined up the sloppy team and saw the light that low timing = reliable

 

You make the best koolaide Matt.

 

hahah

 

when i was a young internet warrior everyone on the internet tried to tell me timing makes the power in the LS motors, the only thing timing will get you is broken parts, read this entire thread if you disagree lol

 

Sure.

 

what you need to do is if your car makes say 700whp, 18psi and 14deg timing on teh dyno if it can nail that down 2x in a row and not blow up, you should take two deg out of the motor, and see if it makes the same power.

if it does, you have too much ignition on the car, lower it and try again

likewise if you make a dyno pull at 15 and 15... and it does 550, and you toss in 1deg and it picks up 25rwhp...

keep adding timing till it drops do like 10-15whp per degree. once these motors quit making power easily they start to ping

you can do the same thing with a stock corvette and hptuners..

22deg 305rwhp 310tq

23deg 305rwhp 300tq

tq will fall off

24deg 308whp 292 tq

25 pinging *****...

then you get it off the light roller and on the highway and it pings face at 22deg and you end up with a safe 21deg where it made best gains without going over center.

if you read the plug strap staying a little low on center is always your safest bet for gas quality, temp control and etc etc variables.

in my world the tune that you drive to the track, race, and drive home, then do 1000ft burnout, is the same tune.

 

i used the same method to safely tune a totally different honda D series single cam turbo engine

25psi and 7deg of timing - low center on the strap, good power per degree

im not an expert but these methods work, take what i say with a grain of salt.

 

0:16-0:24. Know what the timing was that entire time?

Tell em Miley...

NEGATIVE



And I drove the car home, no melted exhaust valves. LS1tech myth 102, busted.

 

I stopped breaking stuff when I surrendered to my addiction to timing. Passages Sloppy helped me limit my timing to just 11* and 18psi. Trapped 139 at 3900lbs.

According to LS1tech, there's about 107 WHP being left on the table because I don't have 18* and 18psi in my motor.

 

I have never hurt my engine ever..

19 to 22* gave me 2mph at the track

Br7 are great hardly ever even pull them

E50, my own tuning