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4am... highway 3.... Det cans.... Built LS-t

Old 04-04-2007, 12:26 PM
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Default 4am... highway 3.... Det cans.... Built LS-t

So someone tell me a better place to do some tuning...

It's 3am, and my buddy and i are chillin in the dorms, bored as ----.... and i get the genious idea....

LETS GO TUNIN ON THE HIGHWAY!!!! nO cars out, street lights are on, 4 lane highway (8 lanes total) for our tuning pleasure!!!!

So we grab my laptop, dataloggign cable, chip burner, det cans setup, and head out to Rt. 3 in Nashu, NH. (right next to our college.

So we do quite a few 3rd gear pulls.... My buddy wearing the det cans and hittin the record button on CromePro, and i'm sittin watching fuel, boost, and driving.

Runs way lean the first few pulls... (upper rpms are around 14.8 - 16 !!! And Mike hears some detonation around 4-5k... then it grows more and more and lots of det. between 6-7k.

SO>>>> pull out crome, dataloggin, do some auto adjusts... i think it needs more... i tweak some fuel curves and drop the timing way down... Slowly adding more timing and a little more timing...

Now... I have a real steady a/f of 12.6 in boost, and can't hear much detonation anymore...

Detonation sounds EXACTLY like rice dropping on tinfoil... (who ever came up w/ that analogy first is a genious, becasuse that's exactly it).
HERE'S MY QUESTION.... HOW MANY TIMES CAN YOU HEAR DETONATION SAFELY? Because i advanced the timing a little bit at a time... BUT... i am hearing "one piece of rice drop" just above 6k rpm.

Is just one rice drop ok? I think i'm going to pull it out anyway.

Dizzy's set to 16* btdc.
on the 450 dsm injectors @ 10psi right now....

Soon as ignition is 100%.... I'm puttin the 880cc's in, and goin for 20psi
Just hope my clutchmasters stage 3 will hold up

HORRAY FOR DET CANS!!!! I'm in love with them, and use them ALL THE DAMN TIME when i'm tryin to find out where a noise is coming from.

Ripper vids coming soon. Stay tuned.
Who needs VTAK?!?! i got TeRbough!!!

~Kevin
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Old 04-04-2007, 12:29 PM
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Default Re: 4am... highway 3.... Det cans.... Built LS-t

I must be retarded and slow this morning....what are Det cans? :1
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Old 04-04-2007, 12:30 PM
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Default Re: 4am... highway 3.... Det cans.... Built LS-t

I'm guessing some ghetto *** cans used for hearing detonation, I've heard them mentioned before. Would like links to more info because I'm hopefully tuning this weekend.

Not sure, has been in the 70s and 80s and this weekend it's supposed to be freezing temps, goddamnit.
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Old 04-04-2007, 12:33 PM
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Default Re: 4am... highway 3.... Det cans.... Built LS-t

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Det cans~~!!!!!

I'm just usein em here to locate a noise...

When drivin, u put the end of the hardline hose on the end of a pipe that you bolt to the block.

I used a 6" Brass nipple... crushed the end of it, put a hose barb on the end of it, and feed the hose out the back of the hood, in the window, and listen in the ear muffs.

Works like a CHARM!!!! SO much better at detecting detonation. I LOVE IT.
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Old 04-04-2007, 12:40 PM
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Default Re: 4am... highway 3.... Det cans.... Built LS-t

nice valve cover!
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Old 04-04-2007, 01:25 PM
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Default Re: 4am... highway 3.... Det cans.... Built LS-t

Originally Posted by ^^whatnoobsearchthengtfo
nice valve cover!
i <3 bondo
HMT style haha
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Old 04-04-2007, 01:51 PM
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Default Re: 4am... highway 3.... Det cans.... Built LS-t

i got MOOOVED! i thought i was just tellin a funny story about tunin on the highway~ not discussin engine management.

oops~
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Old 04-04-2007, 01:59 PM
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Default Re: 4am... highway 3.... Det cans.... Built LS-t

Ur DET setup looks pretty sweet.
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Old 04-04-2007, 05:55 PM
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Default Re: 4am... highway 3.... Det cans.... Built LS-t

I bought supplies to make my own. Got some muffs, some 3/8" ID tubing, 3/8" ID barb fitting for the ear muff part, some brass 3/8" OD tube to stick in the other end of the tubing (this will be crushed and bolted to the block), and an M6 and M8 bolt in case I needed either. I'll be taking my muffs apart and hooking up only one, it should be easier to use in the car this way. I only got 6 feet of tube, hopefully enough to run from the block through the firewall and to head level.
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Old 04-05-2007, 12:00 AM
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Default Re: 4am... highway 3.... Det cans.... Built LS-t

Run richer than 12.6:1, your lone pingie should go away.

I'm pretty unimpressed by running lean a time or two. ---- happens and it hurts nothing. You run lean enough and frankly there isn't any damage to be done; cylinder pressures drop off quick past 16.5-17:1 AFRs.

What ***** things up is idiots holding into the gas and not letting out - some local asshat was driving his buddie's car while I tuned, we had a boost controller problem where we were trying to go from 6 psi to 8-9 (on a stock MAP) and got 16 instead. You can hear audible detonation, wideband is going lean, I'm smacking the guy's arm and telling him to lift and all he can do is yell "YES! YES!" and hold into it, then grab the next gear just as hard as he can and hold into it some more. :1

What ***** things up is idiots beating on their cars when they don't run correctly. If you get the classic flat spots in powwer, where it feels like the car trailer hitches at WOT, it's because your AFRs are borderline and swinging between rich enough to make power and not rich enough to make power. Go out and beat on the car all night, then blame someone else when it comes apart.

What ***** things up is not making sure your cam and crank are in time after ---- has been decked/milled. Oh, you got the OEM marks lined up the way they should go? That doesn't mean anything. Two degrees off at the cam is a quarter tooth on most Honduhs, manifests as four degrees off at the crankshaft aka ignition timing, things get completely fucked when idiots try to use timing lights with advance features that have nothing to do with setting base timing or try to run D15 crank pulleys on D16 when they have incorrect markings, etc. I see a lot of centered distributors on cars that have no business running centered distributors, the owners swear they checked their timing. They'll show you how 0.030" decked D16 lines up to the 0 degree mark on a D15Z1 pulley with a timing advance light dialled to 16 degrees, and you don't know how to begin to explain to them it's they have no clue what they are doing.

What ***** things up is not tuning your timing under boost. You and your LS? You're fine. LS is very indifferent to ignition timing, and you hooked up a set of det-cans and gave things a swing. My favorite example for timing are D16's, the small bore engines have such small piston areas for combustion pressures to push against, and get really volatile. You can tell people all day to get on a dyno and play around with timing and see how power changes, but they pretty much don't. I'd rather street tune a 350-400 whp B-series and let it go than have a 250-275 whp D16 pass through my fingers without a dyno session to make sure it's a happy engine.
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