help not reving out

[88omni2.5turbo]

well i got a 88 shadow es that had a 2.2 turbo and i swaped in a 2.5 turbo motor into it..but the problem was it was running to lean but ran ok and went like stink made good boost and so on.. so i bought a set of mopar performance +20 injectors casue i was worried about killing the motor and donavans garage said that +20 injectors solves the problem....but now the car at low rpm is great runs way better then before but now it will not rev past say 4-5000 rpm jsut sitting in park..and as soon as i take it on the road and get it under load it crpas out and if i hold the gas down it starts to make funny sounds and the rpm goes down...ive tryed everything i can think of like map ,vacume lines ,frel pressure is about 50 at idel and if i rev it up it almost goes as high as 70 psi. and it smells funny out the tail pipe..im out of ideas...any help would be great...thanks ...

[88omni2.5turbo]

ps i have a autometer air fuel gauge and it reads a bit on the starch side and when i rev it up a bit on the rich side...

[NAJ]

I am not into performance but....
You changed the injectors but did you change the Cal in the controller to compensate for the added fuel?
Static Rail pressure is 53-57 PSI,you will lose 1 PSI of rail pressure for every 2"HG applied to the FPR. Rail Pressure will increase 1 PSI for each lb. of boost.
If pressure is too high you may have a FPR problem or a restiction in the return line.
Also how much boost are you running? The stock MAP sensor will only read to 14 PSI and voltage will be 4.90.
Be sure that at idle you have 16-20"HG at the MAP sensor or the entire fuel curve will be wrong.

[88omni2.5turbo]

i havent changed anything so far other than the injectors....i was told casue im useing the 2.2 conputer with a 2.5 motor that the +20 injectors would compansate for it jsut about right on the nose within 3% so far i cant more then 8-10 psi before it craps out....and i got about 20 pounds of vacume to everything...im going to try another fpr today but i dont think that is it...thanks

[NAJ]

Connect your fuel pressure gauge and tape it to the windshield.Take a helper along to watch the gauge and drive the vehicle until the driveability concern appears and see what the fuel pressure and vacuum/boost is reading.You have to try to take readings when the condition is present.
Also be sure all of your basics are correct, cam timing,ignition timing,minimum of 25 kv from the ignition system etc.

[88omni2.5turbo]

ok thanks ill try that and ill let u know what happens..thanks

[88omni2.5turbo]

well i played with it tonight and tryed alot of things and i finally got it to run right by unplugging the fpr and now its great...runs a but towards the lean side..but not bad at all..so now i need to a get a afrp and i should be good..well that and i need to bypass the map now..14psi cut out..weak...lol....but thanks for the help

[crazymadbastard]

Something is not right, as the boost goes up the fuel pressure must go up. By removing the vacuum line, you will not feed enough fuel under boost. I would check the cam timing and ignition timing. Check out the Dodge - Motorsports, it is kind of tricky. I still have to tripple check myself. Check for a ground strap behind the intake manifold to the firewall too. Clean and tighten all the electrical connectors too.

[88omni2.5turbo]

it seems to ba a bit rich stil at idle and when i get boost its a bit on the lean side...so im thinking if i get the afpr then i can hook up the vacume and i can adjust it too where it needs to be...im thinking the injectors are just to big for what i have setup on the car and its flooding it out as soon as the fuel pressure rises..but i will 4 sure check out all the grounds and connectros too..thanks...

[88omni2.5turbo]

ps what kind of afpr should i get..any better one..thanks

[91shelby]

I would definitly try to find a 2.5 comp or recal the one you have, because the 2.2 and 2.5 have different curves

[NAJ]

I was also wondering why you stated you were going to "Bypass the Map Sensor"?
MAP Sensor is Dominant fuel control and the vehicle will not run without it.
From what I understand if you are running above 14lbs. of boost you need a 3 bar Map and will have to re-cal the controller to read the additional boost.
If I am incorrect someone please correct what I am saying.

[88omni2.5turbo]

i tryed to find a 2.2 puter down here and i cant find anything ..2.2 stuff everywherebut no 2.5 stuff....and for the map sensor on donavins garage page he says u can put a dioide in the map harness between 2 wires to get more boost and not have it cut out...if thats wrong please let me know before i do it..i want more boost..14 is weak.lol...thanks