losing power!!! dyno and afr chart inside

[aznrib]

I went to the dyno a couple of days ago and my numbers were not what I would have expected. My setup is a basic sr swap with just simple bolt ons. I'm running 13 psi untuned. I have a hks actuator and a turbosmart manual boost controller. I am going to elminate the turbosmart boost controller but I did not have the time yet. Basically my first run was looking good until it hit 5000 rpm. My second graph shows my first run vs my last run and as you can see my power dropped significantly. It seems like when I hit 5k, I am running way to rich which is robbing the motor of power. I believe I should be arounds 12s after 7psi hits. I know this can probbaly be fixed if I were to get the car tuned but if there is still something broken then it would just be bandaid. Can this also cause it to bog after continuous runs? I am totally stumped. If someone can point me in the right direction, I would greatly apprciate it.

What I tried:-replace bov-perform boost leak test and found a leak on the core replaced IC-changed plugs from bkr5e to bkr6e gapped to 0.28-replaced cts-tried 2 different MAFs-tried 2 different o2 sensors-no codes on ecu

My setupsr20det /w t25 @13psiHybrid front mounthks actuatorturbosmart manual boost controllerGreddy rs bowcircuit sport elbowrsr ex-mag exhaustngk bkr6e gapped 0.28

[Emperor_Tha]

T25 falls flat after 5k rmpYour powerband looks right for your setup. Most average t25 @ 15psi will make about 200hp and 180lbs tq at 6500-7k rpm.

[aznrib]

Oh i see. Any reason why my third run was like 20whp lower?

[DrifterProdigy85]

Im taking a guess you have a Walbro Pump on stock fuel pressure regulator? You'll get more power by lowering the fuel pressure down so you can be in the mid 11's AFR.

[aznrib]

yea i got a walboro with the stock sr fpr. So I should pick up an adjustable fpr?

[DrifterProdigy85]

Definitly buy an adjustable fpr. With that AFR, i can see your running over 50psi fuel pressure. Its typical from the walbro pump on a stock FPR setup.

[pauliedrft]

Well im kinda doing the same thing(walbro /stock fpr on a notch top) but im doing a t3t4 top mount set up .Wouldn't i just need to up the boost a little more to lean it out some until i could afford fpr/ fuel set up ? I havent even dropped my engine in yet so i dont want to change a bunch of stuff and have problems so i want to run it on the break in period stock fpr/ ijectors.Just to make sure engine starts and i break in the clutch .Thanks
Modified by pauliedrft at 5:38 AM 5/28/2009

[aznrib]

I'm less concern abot my afr. I'm more concern about the consistency of each pull. Does anyone know why it dropped so much on the third pull? I only peaked at 180whp. Do you guys think its a leak or some sensor?

[pauliedrft]

It could be a leak why don't you check for one . If you have ideas of what it could be then why are you asking us the questions .

[aznrib]

I'm just wondering if it could be something different then what I have in mind. The more suggestions the better.

[DrifterProdigy85]

Well im kinda doing the same thing(walbro /stock fpr on a notch top) but im doing a t3t4 top mount set up .Wouldn't i just need to up the boost a little more to lean it out some until i could afford fpr/ fuel set up ? I havent even dropped my engine in yet so i dont want to change a bunch of stuff and have problems so i want to run it on the break in period stock fpr/ ijectors.Just to make sure engine starts and i break in the clutch .Thanks

Modified by pauliedrft at 5:38 AM 5/28/2009

It doesnt work that way. The ECU is setup to read the MAF voltage and Load of the engine. With those two being known, you have your fuel table and ignition table.

[DrifterProdigy85]

Power dropping could very well be a boost leak.

[pauliedrft]

I agree with above . definatley check for a boost leak . And thanks for the info