Dyno looks like EKG

[CBLEGUY]

My trip to the dyno looked more like a trip to the doctor.

Right after we left the dyno, my O2 sensor went, blowing my EFI fuse.

The motor is stock minus Titan MHG, ARP studs and a downpipe. I am not doing any upgrades until I get it running right. I am going to put it on the dyno again with a new O2 sensor. I went to buy another sensor, the Bosch book is incorrect. The model of O2 sensor my car takes appears to from a pre 89 model according to the bosch book with pictures. What brand should I buy?

I know that my AFR is affected by a bad O2 sensor, but what could be causing my boost to spike to 9psi, then drop to 6 after shift?

I built one of the boost leak contraptions, and am not leaking boost from any of the piping. I can hear the air going into the motor, but I believe of my plumbing is relatively leak free.

 

[JustAnotherVictim]

I like the second one, lol.

 

[CBLEGUY]

I like the second one, lol.

Thanks for your support LOL!! I know it is pretty pathetic, good news is my heart is not showing any anomalies..

 

[Nick M]

Looks like a fuel injection hault to me. Pull codes and look for 34.

 

[mattjk]

you must still have a boost leak. spray brake cleaner everywhere while idling, see if you hear a change in idle.

 

[CBLEGUY]

Looks like a fuel injection hault to me. Pull codes and look for 34.

have been pulling codes. Only code was after O2 went, and thats 21. Before we fixed a boost leak it was throwing 34, but we got that one fixed, it was a knarly leak outta one of the pipes below the intake.

I am not sure what is going on with it. Turbo feels good, no shaft play.

 

[WeDgE]

I like the second one, lol.

Nananananananana BATMAN!

 

[yrallofthenamestaken]

Wow. What kind of boost controller are you using?

 

[bowsercake]

 

[conundrum07]

Id wonder if the wastegate is failing and blowing open. Either that or boost leak.

 

[CBLEGUY]

This is all fun and everything, but I need help..

I am using a MBC on it's lowest setting, thats all.

I am going to start modding this car, and am trying to basically normalize the how its running.

 

[bgrieger]

you drive an automatic...that might be the bypass valve failing, or the manual boost controller not working so well at the low end of it's range. Remember that slush boxes don't really drop boost while shifting, so any misrelease would cause a spike. If you have the O2 problem solved, take the MBC out of the equasion and try again. Carry a spare good bypass valve as well as this can be changed in seconds on the dyno to rule it out. Finally, check the vacuum lines to the valve...you never know.

 

[Nick M]

What did the dyno operators say? Was it strapped down tight, were the wheels spinning? You are losing power, and there are only two choices, the car or it is slipping.

 

[Ric]

Aids.

 

[yrallofthenamestaken]

Lose the mbc.

 

[MattOneDizzle]

12 mph to 108 mph??? Looks like the car shifting to me. Next time run your 1/4 mile pass on the track, not the dyno.. lol

 

[foreverpsycotic]

did you have the sniffer on? what to the AFRs look like.

 

[yrallofthenamestaken]

did you have the sniffer on? what to the AFRs look like.

afr's are on the first sheet

 

[CBLEGUY]

What did the dyno operators say? Was it strapped down tight, were the wheels spinning? You are losing power, and there are only two choices, the car or it is slipping.

Now that you mention it, he did say something about the tires slipping a little, he let off.

I am going to get this cleared up, which I am sure it will once I start putting my parts on, partially because I am replacing the BOV, intake, IC piping, injectors/Lexus upgrade, turbo elbow and dp as well as the fuel pump.


S

 

[boostindoo]

hey, have u fixed the problem yet? my dyno sheet looks very similar to urs at the top end. thanks