Alright guys I have have my car running since June, and have been troubleshooting my boost problem ever since break in was up. The car feels like it wants to go at tip in, but then falls on its face. I figured it to be ignition, and I have checked everything that involves ignition except for the TPS and the knock sensor that I just installed 2 weeks ago. So, tommorow I will test the knock sensor and the TPS after that I have no idea what to do. I have been trying to sort this thing out since July basically and cant seem to figure it out. So do you guys think I should try and put it on a dyno and see if I can locate the source of the problem from there?

 

What makes you believe the problem is not part of the turbo control system, or the map sensor??

 

I have swapped the MAP sensor, and have thoroughly went through the turbo controls. I actually numbered and/or numbered all actuators, vaccum lines, and solenoids at time of disassembly. And before I blew the motor everything ran fine on the car. On top of that, my boost reads fine on the gauge. I have a proper boost pattern besides a spike after transition which is fine because I know to port the wastegate for that. And the turbos are brand new 99 efinis that I put on the week that the motor blew so I know that they are soild.....

 

So based on what you are saying, you have good boost but have no power? What is your symptom?

 

Well at tip the car just will not accelerate, I know that does not help you understand much but it is hard to explain. It basically feels like when I once blew apart the accordian style hose off the bottom of the intercooler. And also intermittently it will miss, backfire, and bog down when getting into the throttle.

 

Someone say MAP sensor

 

What are your mods???

 

Scorpio, Say already tested(MAP sensor)! Read prior posts. My mods are: new pineapple built motor w/stage three oil mods, new rotors, new housings, all cryotreated, and slightly ported,also new oil injectors and lines, and fuel injectors flowed and matched by Marren fuel injection, m2 dp, m2 ecu, greddy exhaust, short shift, fluidyne rad., new 99 efini turbos, greddy turbo timer, type s bov, dual K&N filters, magnecore 10 mm. wires, NGk 8&9 plugs, silicone vaccumm hoses, ACT 9.5 lb flywheel, RPS carbon-carbon street clutch, cosmo fuel pump, and probably a few I missed but you get the idea. The worst thing is that before I blew the motor the car boosted fine with like 100,000 miles on it. And now that I have spent all this time and money building the motor and upgrading responsibly I cant get the damn thing to run properly. SOOOO frustrating! The car runs great around town its just acting up under boost....

 

make sure the hoses going to the map sensor are connected at the right place, i did that about a week ago and started freakin out, i would floor it and the rpm's would drop

 

My rpm's hold fine, its really strange the car runs great, idles beautiful holds boost it just does not accelerate the way it should....

 

im far from an expert, but could it have something to do with fuel delivery?

 

^ agreed. if your building boost and it is indeed holding, but you are saying you are not feeling any power gained at all.. you are either

1.) Running extremely Rich

2.) Running Extremely Lean

i would check your fuel pressure under load.

 

sounds like it is extremely rich to me.

 

I actually talked to a Pettit tech on the phone yesterday and told him that all I had left to test in the ignition area is the TPS and knock sensor. He told me that he believed it to be fuel as well, but since I have already almost checked everything in ignition to test the TPS and knock sensor. He then told me after that the he would recommend moving on to troubleshooting the fuel system. If anything is to do with the fuel I would imagine it to be more rich than lean. Seeing that everything in the fuel system is new and clean, (flowed and matched injectors, cosmo fuel pump, m2 ecu, and a fresh filter, all new!) So if it was to rich, how would that be adjusted with a regular style ECU on the car?

 

rich, for sure, check behind you when it startes to sputter or bog down, do you see any black smoke, if so its definately rich....

 

Is there a way to adjust that safely myself, if that is the problem?(rich)?

 

Power FC?

 

No, I am running the m2 ecu. But my good friend has a FC on his FD.....

 

The M2 ECU is "plug & play" w/ no adjustments.

1)Can you uninstall your knock sensor? Maybe that is retarding timing too much?
2)I'm also thinking that you might not be getting enough spark. Try and find someone running an HKS ignition amp and tryin on your car and see if that clears up your issue.
3)Install Grounding straps. Maybe your not getting enough voltage

 

IMO,

I wouldn't install an HKS Ignition amplifier. Why? This problem shouldn't happen with the stock ignition (if it is an ignition problem).

Aside from verifing that the TPS is adjusted, get a cheap fuel pressure gauge and make sure you aren't dropping fuel pressure in the higher rpms.

A dyno would be nice to verify a problem does exist, but not necessary.

 

I had a Jacobs ignition amp on the car, when I started to troubleshoot the ignition in july I ripped it off. I have checked the grounds, and swapped the knock sensor of my friends car. Tonight we are going to test the knock sensor and the TPS, after that I guess we will start to troubleshoot the fuel system....

 

Mahjik, if the problem is that im running too rich, how would I adjust that with having an M2 ecu?