setup - itr with greddy turbo kit (18g) and toda cams. Big injectors and uberdata.

I was driving home yesterday and the car shut off on coastdown to a stoplight. (This happens rarely to me, but it does happen with my base map.)

No big deal, but I tried to crank it while still coasting and the clutch in... it kept turning over, and then reluctantly turned over slowly with an erratic idle. Then it was making a horrible whirring noise... and THEN IT idled at like 400 rpm and produced 20psi!? WTF?!

Then got scared and cut it off! That was crazy.

So I'm sitting at the stoplight and the light turns green. But the car now won't start. I'm cranking it, but getting nothing..... So I put on my hazards, thinking I shredded a timing belt or blew up the motor or something...

Then it starts right up like normal and I continue on home without any incident.

Weird, I know.....

It drove fine on the way to work this morning.

But I'm wondering wtf, and why it got 20psi of boost at such a low idle...

Maybe the cranks spun backwards and it got that psi in the intake manifold, but not in the charge pipe so it couldn't be released by the bov?

I'm stumpZ0rD!

 

if the guage is electrical i would guess it would have something to do with the guage getting a higher voltage (therefore reading a higher psi) when the car was being started before i would think the crank would be spinning backwards

sorry i couldn't be of more help

 

That's not physically possible. Just probably a voltage draw some where and screw up your boost gauge. Try check your alternator, it may be on the way out.

 

did it back fire?

 

I highly doubt you got 20psi of boost.. I mean your turbo wasn't even spooling! If you did you block would be toast by now.

Either you gauge was malfunctioning or Uberdata was going AWOL. I say, get a decent fuel management to start with...

 

I think you exhaust valve sucked in the gases from another chamber and when the intake open it whent to the intake manifold reading pressure between the tb and the head. There is little oxygen left in that air so the car will choke or idle realy low.

I will make sure the cams are installed properly. I could happen again. Its is recomended to use tubular turbo manifold.

 

A few times before I was boosted I went to start my car and I would crank it just right and my boost gauge would read like 5psi, but then quickly jump back to 0. Maybe thats just what happend to you. Get your basemap tuned, good luck

Blaze

 

I have the same issue but my boost gauge sticks at 2 bar. all I do to get it unstuck is roll into boost about 5 psi and it jumps back