whas running ten pounds in the car and it was too much. Black exhaust and my dipstick shot out and shot oil all over the engine which also has a realy bad knock now. Yes my engine is f#$%ed. Mechanic won't be able to work on it for a while any ideas on what to do now? Oh well looks like a good time to put in a new shortblock.

98 Z28 Tubotech 60-1

 

OUCH!

 

<img src="gr_eek2.gif" border="0">

guess you didn't upgrade the fuel system, or get tuning, or run enough octane

sounds like you holed a piston, or atleast blew through a ring land. Plenty of crank case pressure

<img src="gr_sad.gif" border="0">

gotta pay attention to the details w/ boost

 

Man sorry to hear that. Now you guys know why I run the 100 octane most of the time. I may grenade the motor tomorrow but it wont be from lack of octane. You could get a set of 6.0 heads to lower the compression. How much power were you making with the t-60 and 10 psi? Harlan is right on with the fuel/tuning questions. if these are not corrected you may do it again. Can you give your setup and how long you were running the turbo
?

 

haha...what do you think I am stupid? (sarcasm)course I upgraded the fuelsystem with 38lb injectors and a inline pump I even had the computer programed by ed wright. Octane? whats that? I knew I forgot something...duh. Turned it up just a little too high, I'm such a dick. You should have felt the torque it was putting out, it was amazing all 6 seaconds of it. I'm realy not down about the whole thing though. Because we possess the technology to build it back stronger, faster, better than before! <img src="gr_grin.gif" border="0">

realy don't know how much power it put out though
it only made 350hp/422tq at 4 lbs of boost before who knows how much it was making at ten...sure felt like alot

 

Sorry to hear. <img src="gr_sad.gif" border="0">

How were you monitoring your A/F when at WOT?

 

with my trusty/POS (yet to be decided) autometer AF gauge. It stayed in the green.

 

Ed sets the timing pretty low so I am abit surprised. Harlan mentioned bosst being referenced from the manifold or the turbo.I'm guessing you are getting your boost numbers from the manifold. Its just odd to me that it blew. When i first got my kit put on, I had a couple of runs at 10psi that spiked to 11-12psi. This was on 93 octane but a max of 16.5 degrees of timing. Car ranblike ****. It runs much better with less boost and more timing.

 

[quote]Originally posted by gogogadgetcar:
<strong>with my trusty/POS (yet to be decided) autometer AF gauge. It stayed in the green.</strong><hr></blockquote>

I can believe that.

If you had the injectors and pump, it'll stay rich where it should

But, rich != safe. You can have all the fuel in the world, but if you're not running enough octane for the boost/advance combo detonation will kill things.

Sounds like exactly what happened.

Even if the tuning had low advance, you gotta remember the proper fuel. I run 10 psi all the time, but i also run as low as 14° of advance at peak torque (ie peak cylinder pressure) and 100+ octane at all times.

Even with 14°, i can't run more than 7 or 8 psi on pump gas, and that's 94 octane.

Detonation kills parts, and unfortunately you learned this the hard way. <img src="gr_sad.gif" border="0">

[ February 23, 2002: Message edited by: y2khawk ]</p>

 

when will you people learn that high compression and boost doesn't go together for a street car?

 

im betting its a cracked ringland like this. (copy and paste into new window)http://community.webshots.com/storag...uJecMrE_ph.jpg

this was from overboosting with not enough fuel 'oops'

but after more perf. motor and tuning from ed wright with the new motor it was still lean (very) and i had to send it back again.. at that point i was able to run 12psi on the t-60 on pump gas with a touch of octane booster at the track. honestly felt faster than the t-76 did but the 76 ran a mile an hour faster in the 1/8th the pass before i broke the rod.

did you ever wideband dyno or watch the fuel pressure under boost?

[ February 23, 2002: Message edited by: MIGHTYMOUSE ]</p>

 

Ya I imagine it was the low octane and who knows the car had 65K on it maybe something else was already starting to break. Had the turbo on for about 8K mostly highway driving. Fuel pressure was about 60 or 65 PSI.

 

Man you got to control the urge to crank the boost up, even though it feels so gooood.

Feel bad for ya, hope we all learn through your lesson <img src="gr_sad.gif" border="0">

 

Don't trust the Autometer A/F gauges unless you have them recalibrated for WOT. They don't work for WOT straight out of the box.

I prefer LS1 Scanmaster. Displays O2's & KR.

 

If you rad the instructions that came with your gauge, they state the lowest "green" led is actually indicating .750 for the O2 (way lean). You have to keep things at the 3rd green LED minimum.

I have some good news for you! You can buy my short block already built for turbo application if interested. Details are here: www.turbo-ws6.com/carpix.html

Short block - $3500 (shipped no core required)
Long Block - $5000 (shipped no core required)

Send me email if interested. Engine has about 1200 miles on it.

 

High compression and 10lbs of boost! WOW! Next time you do that let me know....I will use some vacation time to come see the fireworks. Just kidding, sorry to hear anybody having such troubles. A low compression engine is the only way to go.

 

It's not unheard of to run 10+ psi on a high CR motor.

You have to do it the right way, and this is an example of how not to do it. Sad to say it, but it's true.

Now i'm not saying go out and run 10 psi into you stock motor, but you HAVE TO PAY ATTENTION to the whole system

I've done it for 26k miles

 

ya I guess I had a major brain fart... I knew better than that to turn it up that far, but I did'nt know the last green bar on the AF gauge would be lean. If that was the case I had probably hurt it before because its been about two to four bars green since about November and maybe this was an accumilitive thing. When humpty dumpty finaly gets put back together again I'll deffinetly be posting alot with tuning questions so this never happens again.

 

I tried 10psi accidently this weekend. Accidently =turned boost controller 1/2 turn thinking I would be at 8.5 psi instead went to 10. Blew coolant out the overflow so I must have lifted a head. No permanent damage but only because of luck. I was running 100 octane with 24degrees. I can only run about 6 psi with 93 octane with 24 degrees of timing. with 100 octane it runs 8psi with no problems and 24 degrees of timing. When I get ls1 edit, I will do a timing curve like Harlans. You GOTTA be careful with the stock compression. I think an A4 car could run 10.90s with my setup at 8psi. I cant 60' any better than 1.7 without Harlans 2 step. I'm launching at 5500....no spin but the motor just doesnt have a lot of torque with no boost. I bet the cutout is hurting the torque as well on launches. Hopefully Colonel will report back that all is well with the 2 step and we can get them in March!

 

[quote]Originally posted by cablebandit:
[QBHopefully Colonel will report back that all is well with the 2 step and we can get them in March![/QB]<hr></blockquote>

like this https://ls1tech.com/ubb/cgi-bin/ulti...c&f=5&t=000769

Tracking down the fianl parts now <img src="gr_stretch.gif" border="0">