PvillKnight7

iTrader: (16)

I just got my Haltech installed on my 87 TII (fmic, T04, street port and free flowing exhaust) and was running a real rich base map ( the one for the s4 with T04 from Hitmans website) and was trying to tune it with my friend. I had already tuned it real good for idle and free reving. I was running the lowest boost (12psi) I can with my boost controller and was trying to tune the on boost off boost transition with my egt gauge and a/f gauge. It felt fine and the car was running real good, real strong and smooth but the 02 gauge was showing it runnign lean for a sec. before boosting but I read that is normal. Anyway, I was still trying to richen it up a little for saftety until I find someone with a wideband I can borrow to fine tune everyhting. I made a run through 3rd, everything was fine and I was only shifting at 5.5k. When I slowed down to make a turn and down shifted, it felt like I had it in 5th coming out of the turn because the motor bogged down reall bad and I hardly had power. I got it almost back to my house ( less then a mile) when I took it out of gear it died. Started it up and it made a real loud knocking noise, idled low, bad vibrations. Drove it the rest of the way home, wouldn't boost, excelerated real bad. No power. Anyway, I did a compression check and the front housing was 20-20-20; overall 75. Rear was 25-25-25; overall 110. So it looks like I blew it Sucks.

Anyone have any ideas as to why it blew when I was making a turn ?! And why would it making the knocking noise and vibrate after it stalled and I started it back up?! I'm guessing the knocking noise is because of a blown seal...? That sound right?? If so, did it break when I made the run then come loose at low rpms? Why didnt it start knockig right away?? Sorry for the long post, but this is my first blown motor and I just want to understand a little better what the hell happened.
Thanks,
Ryan

MtnRacer

What kind of turn was it(L or R) and how much gas was in the tank?

Steve

5 point whoa

sounds just like you blew an apex seal, or maybe 2 of em

PvillKnight7

iTrader: (16)

left turn at about 10-15mph. half tank of gas. running premix at 1:100 ratio if that matters...

PvillKnight7

iTrader: (16)

What do you mean, two seals on the front rotor? I thought 100-115psi was good compression and the rear was about 110...??

eyecandy

iTrader: (19)

Compression does not matter when you have predetenation, it can be brand new and have that happen.

BTw I feel you pain, last week I blew to apex seals in the rear rotor.. Due to a low rpm detenation..