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+--- Thread: What not to do to a Turbo II (/showthread.php?tid=1650)
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What not to do to a Turbo II - JackoliciousLegs - 01-27-2005
I totalled my car...
just kidding! Thanks SO MUCH to scotty and hunter for talking me through my car problems last night.
Before I start... here's a timeline
1. Bought car
2. Car felt strained at high rpms (could be clogged cat or fuel cut)
3. bought fuel cut defencer (FCD) (car felt a little better) - thought it was fixed
4. bought straight through exhaust (felt a little better)
5. limited boost so it wouldn't creep
6. car felt slow and still strained at high rpms
7. put car on dyno to achieve a whopping 14:1 A/F ratio (SUPER LEAN)
So, there I was trying to figure out why the hell a more or less stock tii was getting such a bad A/F ratio.
After a month of diagnostics from rx7club and a long dinner of discussion with scotty and hunter, I was going to check the FCD and the readings off of the pressure sensor that it hooks into. It was FREEZING this morning so I decided to just yank the FCD out and see what happened.
Immediately, A/F ratios read richer on my o2 readout. I thought, "uh oh, I think I might have found it." Finally, the car was warm and I did a pull from 2500 rpms. BAM! super torquey! PULLED SUPER STRONG!! I haven't boosted this car for a long time, but gawtdayum that car felt faster than I remember it! o2 readings were at 13.0 but I didn't get to look at o2 readout which is more important (not extrapolated) because I got to work REAL fast.
Either way, the car feels like a new machine. I'm still going to check the readings from the pressure sensor and make sure that it's giving proper readings.
If I can confirm readings from my o2 and that they're going significantly higher than before, I probly won't dyno it, but if my results are not 100%, it's time for me to shell out another $120 for use of a wideband.
PS... it felt super fast peaking at only 8psi. (stock is around 9 and it hits 9 much faster than creeping up there)
- Mike - 01-27-2005
wanna race?
congrats
so basically you pulled out the thing that you installed?
- ScottyB - 01-27-2005
good deal Jack! and you thought the boost rot had faded....
- JackoliciousLegs - 01-27-2005
yeah, so the original problem wasn't fuel cut, it was the cats being clogged. I just didn't remove the FCD before I did the exhaust so I had no way of telling it was cutting out the signal from the pressure sensor.
- ScottyB - 01-27-2005
JackoliciousLegs Wrote:it was cutting out the signal from the pressure sensor.
sorry man you lost me. so the cat being clogged was messing up your pressure sensor signal?
- JackoliciousLegs - 01-27-2005
no, the cat being clogged was the original problem, not fuel cut. The FCD must be faulty... or just not sending a signal to the ECU (limp mode)...
but since my car was like this since I got it, I never noticed the difference. People riding with me were like, it still feels quick!
- PDenbigh - 01-27-2005
Jack,
I have a LM-1 Wideband O2 setup if you'd like to check it out. PM if interested! (This goes for anyone local on this list as well)
- CaptainHenreh - 01-27-2005
PDenbigh Wrote:Jack,
I have a LM-1 Wideband O2 setup if you'd like to check it out. PM if interested! (This goes for anyone local on this list as well)
As in, one for purchase or one for use? Because I'd LOVE to have one for about a day when I take out the Supra, to check my AF ratios and configure my TTimer/O2 Sensor readout.
I'm tempted to build my own permanent wideband 02 sensor, though...
Anyway, congratulations Jack-o. I thought your car seemed awfully slow when I drove it...
- JohnC - 01-27-2005
Nice work Jacko.
- JackoliciousLegs - 01-27-2005
Well, i don't want to celebrate early. Need to get a wideband on it.... but thanks everyone
FREE RIDES FOR ALL! BOOST INCLUDED!
- .RJ - 01-27-2005
Are exploding rotor housings included in the show also?
- JackoliciousLegs - 01-27-2005
rotor housings never asplode
- bluhayz - 01-27-2005
So wait a second.... your car is even faster now than before? Has it always been considered slow or am I crazy? I just remember it being pretty quick when we were test driving my friend's 7 over in kingstowne...
I need a ride to check this out, and you're gonna give it to me :-p
- PDenbigh - 01-27-2005
CaptainHenreh Wrote:As in, one for purchase or one for use? Because I'd LOVE to have one for about a day when I take out the Supra, to check my AF ratios and configure my TTimer/O2 Sensor readout.
I own one, and I say "for use" with constraints. I can't have 50 peopel asking to borrow it. So, it's not for sale, it's for my use, and if you need to try it out for a day we can work something out!
- Dave - 01-27-2005
Good work Jack. I'd like a ride to see if that pile is actually fast now :-D
Just don't blow it up before I get that ride :-p
- ScottyB - 01-27-2005
so is it back to it's old flame shooting shenanigans?
p.s. as your official counselor i want a ride
- JackoliciousLegs - 01-27-2005
well, with my narrowband o2, i'm reading around .8V which is still a little lean, but it feels better.... i'll let everyone know what happens after I strap it with a wideband tonight...
- JackoliciousLegs - 01-28-2005
10.3 at WOT in top gear. It was indeed the FCD. Showed no leaner than 12.0 under boost. Thanks pete for dealing with me in a hurry!
Oh, and I hit fuel cut. That scared the piss out of me. Time to get my wastegate ported.
PS. We took one 5 minute run with the o2 ducktaped to the exhaust. ONE RUN... and the ducktape was melted... lol
PPS. I shot 2 gynormous flames out the back.... at once. LOL
- CaptainHenreh - 01-28-2005
JackoliciousLegs Wrote:PPS. I shot 2 gynormous flames out the back.... at once. LOL
I need to get my camcorder on that shit. High boost run and then drop throttle...
Why not get a bigger turbo instead of porting the 'gate, jack? Get a bigger turbo with an external gate, and then you won't have to worry about any boost creep problems.
- JackoliciousLegs - 01-28-2005
hey everybody!!! Rex is now going to be paying for our modifications!!!