Whats Wrong?

[Darkspyder4g63]

Hey everybody im new to DSM so i dont know if i did something wrong, but here is my problems. I have a 1999 spyder gst, it has an KN Intake, Greddy type s BOV and Hard pipes, 3" cat back exhaust. The car will run rich and the at about 500 rpm it will run lean. I have not touched the boost at all, it is at 15 psi, my friend has the same mods and his car only runs 12psi and does not run lean at all. I took the car to the dyno and it did 167 hp and 205 tq. I dont know if that is a good hp and tq for what i have done but it seems low, but hey im not real sure.So any ideas or suggetions on what the problem is would be awesome.I also have lifter tick, could the knock sensor pick that up and retard the timming?
Thanks

 

[harjms]

Hey everybody im new to DSM so i dont know if i did something wrong, but here is my problems. I have a 1999 spyder gst, it has an KN Intake, Greddy type s BOV and Hard pipes, 3" cat back exhaust. The car will run rich and the at about 500 rpm it will run lean. I have not touched the boost at all, it is at 15 psi, my friend has the same mods and his car only runs 12psi and does not run lean at all. I took the car to the dyno and it did 167 hp and 205 tq. I dont know if that is a good hp and tq for what i have done but it seems low, but hey im not real sure.So any ideas or suggetions on what the problem is would be awesome.I also have lifter tick, could the knock sensor pick that up and retard the timming?
Thanks

167 hp? thats sounds kinda bad...i know stock they have like 205 hp...at less psi. is your BOV recirculated or vented in atmosphere?

 

[Defiant]

The car will run rich and the at about 500 rpm it will run lean.

According to what? What else haven't you told us about?

 

[PaleDSM]

Exactly, how do you know it is running rich or lean?

 

[Darkspyder4g63]

The way i can tell it is running lean is i have a A/F gauge, i know your not susposed to rely on it, but the guy at the dyno told me that i was running way to rich from 1500rpm to 4500 rpm and then at 5000rpm it goes right to lean. My BOV is recirculating.

 

[PaleDSM]

What a/f do you consider lean? 11:1, 12:1, 13:1?


With a setup like that and if is running really lean only above 4500 I'd look at the fuel pressure regulator first and make sure it is raising fuel pressure correctly.

 

[Darkspyder4g63]

Well it goes to 2 bars of red left on the A/F gauge im not sure what that works out to be

 

[Defiant]

The way i can tell it is running lean is i have a A/F gauge,

That's what I was afraid of. You should wire that to a speaker output, not the ECU.

i know your not susposed to rely on it, but the guy at the dyno told me that i was running way to rich from 1500rpm to 4500 rpm and then at 5000rpm it goes right to lean.

And how did your dyno guy make this determination?

 

[Darkspyder4g63]

Yeah my dyno guy told me that i was running to lean at higher rpms, and to rich in the low, and you dont have to be a smart ass about it. I just want to get the car running right.

 

[Defiant]

you dont have to be a smart ass about it.

Ah, you're new here, aren't you? We had to ask before you told us about the A/F gauge, and still, so far, all you've told us is that "your dyno guy told you". Was that a guess on his part? Was he just covering for having no clue why your power output wasn't what he thought it should be? Were those number at the wheel or at the crank?
We're keen on helping you, but at a distance of 2000 miles we really have to get all the information you have to have as much of a clue as you aspire to. Whatever's wrong, it's already apparently been enough to stymie someone who can owns, but possibly can't properly run, a dyno. Is this "dyno guy" familiar with working on DSMs? Did you put in new plugs and wires before doing a dyno test? We can't do a thing for you if you're going to pull a Portugese lift on us.

 

[Darkspyder4g63]

Ok sorry being an ass, the dyno readings were at the wheel. The dyno is located at a turbo porsche tunning shop. My dad takes his car there so i figured they must know there shit.So the are no familar with dsm. I could not be in the room when they did the dyno runs. I could only watch through a glass window. The guy just told me that i was running to rich at low rpms and lean in the highs. And actualy before i went to the dyno spark plugs and oil were changed. The dyno was call a mustang dyno. I think its a brand of dyno. What i dont get is why does the car run 15psi, my buddy got the same mods and same car, and same year and he runs 12psi, and what would cause the rich/lean problem.But you have to admit somthing is wrong with 167 hp and 205 tq, but the car does pull hard through all the gears. I have taken other gst with around the same mods, and the wernt bad drivers. but with those numbers i feel like a HONDA :thumbdown . I do have a SAFC but it is not installed till i figure out this problem first. Is there any other info you need. Because i just want to figure this problem out.

 

[boostin_2_high]

I have the same problem. When i log my car (WOT, 3rd Gear pull) the low end is fine and it continues to richen as the rpms grow untill i hit around 4,200 rpm where my O2s drop dramatically...? It doesn't matter what boost i'm running, the problem still pops up on extremely low boost. I didn't have this problem until recently. My mods are below...

'98 GST
CFDF Clutch
MBC
Walbro 255hp/rewired
stock FPR
14b
stock injectors
UIP w/Greddy BOV

any help will be appreciated....

 

[oldman]

Correct me if I'm wrong but doesn't 167 whp sound about right for a almost stock setup?

 

[Catbox_95]

If the car is an automatic (again, something else we don't know about this car), where there is more parasitic loss through the drivetrain, 167 at the wheels sounds about right. With some proper tuning with say, a wideband O2 and INSTALLING the SAFC you already have, you will get a higher hp number, no doubt. You said you won't install the SAFC until you get this figured out, yet the SAFC will help solve the problem.

I say the car just needs to be tuned properly. An A/F alone provides no help. And we STILL don't know how the guy at the dyno knows when you're running rich/lean.

 

[Darkspyder4g63]

The Car is a manual, i have know clue how the guy new that is was running rich and lean, is there somthing the hook up to the car that could tell that. I figured if they tune high end cars they knew what they were doing. I meen my dad has taken his cars there and they always seem to tune them to get good numbers, but then again those cars that they are familar with arent dsm.Plus they didnt tune mine they just got numbers.

 

[Defiant]

Ok sorry being an ass,

Nah, we understand the frustration. I'm glad you do, too.

the dyno readings were at the wheel.

As said above, then they're not all that far off.

The dyno is located at a turbo porsche tunning shop.

Ah. That tends to make me suspicious, because Porsche people might find DSMs a bit.... cheap. Which I'd think would shade how much they'd really put effort into it.

My dad takes his car

Oooh, a rich dad. Has he considered the many benefits of adopting?

there so i figured they must know there shit.

Well, they probably know their Porsches. But imagine how much tuning help we could give them.

So the are no familar with dsm.

Which is why you're now here.

I could not be in the room when they did the dyno runs. I could only watch through a glass window.

Yeah, baloney. They should let you in, but that's that.

The guy just told me that i was running to rich at low rpms and lean in the highs.

Damn. Y'see, that doesn't really mean much to us. I'm sure that just as a part of their air-cooled cylinder setup, Porsches run a lot more rich at high rpms than DSMs do, and I don't know if that guy has enough exposure to modern powerplants that use liquid to cool the whole block to recognize what's "rich" and "lean" in our motors.

And actualy before i went to the dyno spark plugs and oil were changed.

That can matter a lot more than you'd suspect, so at least that's out of the equation.

The dyno was call a mustang dyno.

That's the one they have on Two Guys Garage. It's a good show, because they use old people on it.

I think its a brand of dyno.

Yup.

What i dont get is why does the car run 15psi, my buddy got the same mods and same car, and same year and he runs 12psi,

Either of you running an MBC, or have you done the boost controller solenoid mod, or do you know?

and what would cause the rich/lean problem.

Eh. I still don't have proof there's a problem.

But you have to admit somthing is wrong with 167 hp and 205 tq,

Not once it gets to the wheels, necessarily.

but the car does pull hard through all the gears.

That's the main thing.

I have taken other gst with around the same mods, and the wernt bad drivers.

Don't speak of that here.

but with those numbers i feel like a HONDA :thumbdown .

The threat of A Little Knowledge.

I do have a SAFC but it is not installed till i figure out this problem first. Is there any other info you need. Because i just want to figure this problem out.

Sounds to me like you may not have a problem. Check your fuel pressures.

 

[oldman]

Some one call 911, I think some thing is wrong with defiant. :laugh:

 

[Darkspyder4g63]

Yeah i dont think they liked my car at the dyno, when they drove it through the shops they kinda looked at it like, what the hell is that. Alot of the cars there were 996 turbo witch is a liquid cooled porsche, but that is beside the fact. Well what i think i might do is do it all over again at a dsm place i found. ill hook up the safc and see what that does. I have not down the boost selinoid thing at all, and the old lady im sure didnt she was the only owner of the car. she did not even know it was a turbo.