Looking for some help on my install. I put a 62-1 with a .68 hot side on my FD and car starts and runs fine until I put enough of a load to get close to 0 psi. Then it starts back firing and stuttering and it won't boost past 0 psi. Anyone have any thoughts on this? I removed the rats nest and all the solenoids and the car is a 93 R1. Thanks in advance. I did a search but haven't found anything yet.

 

Did you change your ECU by any chance or are you running the stock ECU, because your car won't run right with everything removed and a stock ECU

 

check all your bolts and piping, you could be losing power from a leaking coupler or from the gasket between the manifold and turbo...

 

for starters, your hot side is way too small, but thats not why you arent getting any boost. what ecu are you running?

 

We need details on the full turbo kit, wastegate, stand-alone (hopefully you have one), maybe pictures. That turbine housing is pretty small for a rotary...

 

I forgot to mention it is a Pettit Racing ECU. I got the small hot side for very quick spool but I doubt this has anything to do with my issue. I just wanted it for street use, nothing crazy for the track. I was told by a friend that some of the solenoids with the colored connectors need to stay attached. Is this true? I have no check engine and was considering trying the stock ECU. ?? All clamps are tight, I have the map sensor, fuel pressure regulator and the actuator near the throttle body all connected with vacuum hoses to the intake manifold. Sounds like the BOV is leaking when I am near 0 psi on my boost gauge.

Thanks guys

 

I don't know anything about that ECU, but is there a chance it is stuck in a 1 bar mode? Can you look at your map and see what the tune is like for positive manifold pressure?

 

Its probably got a missave boost leak somewhere. Check the I/C piping and manifolds over really close for leaks.

 

I have no clue how to check the map. The car is pulling normal vacuum at idle, so I don't think I have any leaks. It has the problem as it approachs 0 psi, atmospheric pressure. Seems like a big boost leak but I don't think it is.

 

can u hear any air escaping while trying to boost?
do u have a vacuum hose hooked up to your BOV?
take of the intake and ensure the compressor wheel spins freely.

 

It sounds like your car is in limp mode. You can check the codes just like the stock ECU. You are going to get a lot of codes if you removed all the solenoids without adding resistors.

 

I have the vacuum hose attached and can't here air escaping, Compressor is free, spins good at idle.
A friend mentioned limp mode and told me to just clip all the solenoids back on to their connectors. I think that is next on the list to try out. Does anyone know if vacuum is still required on the solenoids? Or I have access to resistors if that is easy to try out.

 

If its running fine and your just not getting boost, it'll be a leak somewhere. Either check all your couplers for the I/C piping or check EVERYTHING on your intake manifold.

Trust me, I've been there. I thought everything was hooked up properly and I was getting no boost.....turns out 1 clamp wasn't tightened at the I/C and it was leaking out like crazy once you'd step on it. It looked hooked up, but it wasn't.
Silly mistake.

 

No it is in limp mode I cant believe you are running a single turbo on that ecu It can be done but you shouldnt be boosting with that ecu anyways. You didnt install resistors in the wiring harness and since the Pettit Ecu is just a soldered/rechipped stock computer the car is in limp mode.

Save yourself the $2k+ you are about to spend on a motor rebuild if you try to boost on that ecu and buy yourself a Power FC and commander and pay to have the car tuned.

In case you didnt understand your car is in Limp Mode. You need 330 ohm 1/2 watt resistors in the 7 different colored connectors underneath your upper intake manifold that are all in a line together attached to the wiring harness and it will stop going into limp mode. However, if you boost more than 5-7 psi the car will likely go into permanent "limp mode"= blown engine.

 

Ughhh, yeah, don't waste your time, go get a full EMS.

 

Thanks for all the info. guys. I ran 14 psi on this ECU on the stock twins so I was hoping 10 psi with this turbo would be ok. I can see about getting a softer spring in the wastegate if you guys think that would be best. I really can not afford anymore money right now.

 

You were extremely lucky you didnt blow the engine on 14lbs with the stock twins. Sell the Pettit For $350.00 Shipped then save up an extra $250.00 and buy a pfc used here on the forum. If not. you will be spending way more in the near future