Dyno Problems

[TheRocket300zxtt]

Can anyone tell my why my car is doing this and offer a solution? It should be making far more power for what I have added.



Mods:JWT Single Pop ChargerHKS Hi-Power Cat-Back ExhaustUltimate Z Split Flange DownpipesUltimate Z High-Flow CatsJWT Reprogrammed ECUUnorthodox Racing Underdrive PulleyApollo Racing Front Mount IntercoolerHowe Racing RadiatorTurbo XS Type RFL Bov'sHKS Turbo TimerInjen Intercooler Hard-Pipe Kit

[elwesso]

Can anyone tell my why my car is doing this and offer a solution? It should be making far more power for what I have added.



Mods:JWT Single Pop ChargerHKS Hi-Power Cat-Back ExhaustUltimate Z Split Flange DownpipesUltimate Z High-Flow CatsJWT Reprogrammed ECUUnorthodox Racing Underdrive PulleyApollo Racing Front Mount IntercoolerHowe Racing RadiatorTurbo XS Type RFL Bov'sHKS Turbo TimerInjen Intercooler Hard-Pipe Kit

whats wrong with the dyno, what do you think is wrong?

[evildky]

have you verified what level of boost your running yet?

[TheRocket300zxtt]

whats wrong with the dyno, what do you think is wrong?

I should be making a lot more power with the mods I have added. And also the huge drop in acceleration at roughly 3,700 rpms on the first run.

have you verified what level of boost your running yet?

Not yet. My boost gauge should be coming in soon. I still have to check the BOV's like you said before. I think that I will get around to it this weekend.

[TheRocket300zxtt]

bump

[PalmerWMD]

Very good torque curve..

Maybe something not right w/ hp to torque conversion?

[nsrZ32]

wow that's REALLY low on power. Check for big boost leaks.

[TheRocket300zxtt]

I will have to do that.

[accel junky]

Do a compression check as well. Then you will know if your rings are shot.

[TheRocket300zxtt]

I finally put in the boost gauge last night. At idle it says -18 psi. Does that mean that I have a boost leak somewhere? Also I went for a test drive and the gauge never went past +5.

[evildky]

-18 is your idle vacume it's suppose to pull vacume at idle and at cruising speeds, as for never going past +5 you either have wastgate actuators that are opening at 5psi or you have a major boost leak happening at 5 psi, I'd say you got a mother of a leak, you can pull the intake filter assy off and install a large plug with an air fitting or schrader valve and pressureize the system to 7-10 psi and the leaks should become very easy to find

[evildky]

oh yeah third possile problem, turbo's that won't spool due to "coking" of the turbine shaft or excessive turbo wear

[cville300zx]

Check your BOV's. Turbo XS BOV's tend to vent under presuure if you dont have enough washers in them to keep the spring compressed.

[TheRocket300zxtt]

Check your BOV's. Turbo XS BOV's tend to vent under presuure if you dont have enough washers in them to keep the spring compressed.

Yeah I've heard that also, but I think I have lost the washers . The BOV's seem to sound pretty loud still, but I think this would be the easiest to look at first.

-18 is your idle vacume it's suppose to pull vacume at idle and at cruising speeds, as for never going past +5 you either have wastgate actuators that are opening at 5psi or you have a major boost leak happening at 5 psi, I'd say you got a mother of a leak, you can pull the intake filter assy off and install a large plug with an air fitting or schrader valve and pressureize the system to 7-10 psi and the leaks should become very easy to find.

Thanks for the great info. How would I fix the wastegate actuators if they are opening at +5 psi? I am going to have to try pressurizing the system when I get around to it. I am thinking that I have a huge leak somewhere as well. I can remember exactly when the turbo's felt weird for the first time. I was merging onto I-83 and I pressed the gas and the car just lurched forward and had no pick-up whatsoever. From then on, it has felt the same way.

Thanks again guys,-Chris

[paemt6220]

I am thinking that I have a huge leak somewhere as well. I can remember exactly when the turbo's felt weird for the first time. I was merging onto I-83 and I pressed the gas and the car just lurched forward and had no pick-up whatsoever. From then on, it has felt the same way.

Yeah, that sounds like a boost leak to me! I don't remember, are you still running two intercoolers or 1 FMIC. I don't know much about the Z32 but correct me if I'm wrong, the 2 sides are independent of eachother when running the stock IC's, aren't they? If you have a boost leak or a bad turbo(or wastegate), the other side will still be boosting to a higher pressure. That would make it easier to isolate the problem.

Like I said, I could be wrong!

Chad

[evildky]

if the actuators are opening at 5 psi just add boost jets or a boost controler of your choice to regulate the pressure getting to the wastegates or you could simpley replace them with new or even adjustable wastegate actuators, also make sure that the wastegate flappers rest in the completely closed position, I've seen the mounting brackets get bent so that the rest position was not completely closing the wastegate flapper, hard to make boost when the wastegate flapper is cracked open

[Dagfasho]

My freind lost his washers too, I think he uses quarters

[TheRocket300zxtt]

My freind lost his washers too, I think he uses quarters

That's a great idea! I will have to try that, thanks!

[TheRocket300zxtt]

I went driving around town last night on the York, PA circuit and I was getting about 15 psi in first gear. It was the best my car has driven in 3 months! Does this still mean that I have a boost leak?

[evildky]

if your peaking at 15 psi there is a reason, your turbos won't spool up, you got a leak, or your jets are too large

[TheRocket300zxtt]

I am pretty sure that my jets are set to 12 to 14 psi.

[evildky]

then it sounds like your problem is solved, and either your boost gauge is a bit off or the boost jets are allowing 15 psi

[TheRocket300zxtt]

I am still confused though because I really didn't do anything to fix it. Maybe the colder air temp is helping out also.

When it ran well, I gave it proper warm-up time and would not let the turbo's spool up until the oil pressure goes down to around 15-30 psi. Maybe that helped also,but who knows, it's finally fun to drive again!