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SolaraGuy.com • View topic - more boost *update
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more boost *update

more boost *update

Postby kondo » Fri Mar 05, 2004 3:46 pm

I had been running the 4 psi pulley since blowing my knock sensors a while back from running a 7 psi pulley.(I have since changed the knock sensors) Any how I replaced my injen hot air intake witht the stock and a k&n and my car has been running very well. So I decided to break out my 5.5 psi pulley and I threw it on yesterday. So far so good no check engine light and the car seems to be pulling harder than with the 4 psi. The only thing i noticed is my car does not do burn outs as good with more boost. I tried doing a breakstand last night and it was not as good as with the stock pulley on the first try, the second one was better but i thought with more boost I would be able to really burn em. Has anyone else noticed less torque on the bottom end with more boost?
Last edited by kondo on Tue Mar 09, 2004 11:49 am, edited 1 time in total.
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Postby cdssolara » Sat Mar 06, 2004 1:29 am

No, not unless you free up the exhaust and eliminate some back pressure. I don't see how more boost alone would have any negative impact on bottom end torque.
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Postby kondo » Tue Mar 09, 2004 12:02 pm

Last night i was at a light blasting my stereo and a guy on a new 100 aninversary harley was sitting at the light next to me. When the lite turned we both took off the same then we both gunned it. I was even with him and then right when my car shifted to 2nd the dreaded check eninge light flashed twice and then stayed on. I drove about 20 miles to my buddies house and swaped the stock pulley back on as I have already blown both of my knock sensors once. After switching back to stock I disconnected my battery and hit the brake to drain the ecu. The check engine light has not came back on, so I think I might be in the clear but no more 5.5 psi for me. Any one want a 5.5 pulley give me a PM, I got it from pulley boys is the GB a while back and have used it for all of a couple of days, it still look brand new.
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Postby SC V6 » Tue Mar 09, 2004 12:11 pm

once a knock sensor is blown.. it will stay that way.. expect the check engine light to come back on... the knock sensors in our cars suck DI CK
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Postby Hsakuragi » Tue Mar 09, 2004 12:12 pm

kondo, would you mind to tell me what you have in your engine? besides the charger of course.
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Postby kondo » Tue Mar 09, 2004 1:04 pm

hsakuragi wrote:kondo, would you mind to tell me what you have in your engine? besides the charger of course.


Stock intake with k&n filter, S-AFC, Greddy exhaust.

As far as the sensors being blown I am hoping it wont come back, maybee it was something else, but i doubt it, i want to relocate my knock sensors so they wont blow as easily.
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Postby Mole » Tue Mar 09, 2004 1:57 pm

i think it's just repetitive abuse on the engine that's kicking the sensor's ass.
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Postby cdssolara » Tue Mar 09, 2004 3:16 pm

Even with 5.5 psi, you'll probably need some fuel mods like injectors or fuel pump to keep from going lean. However, I would be willing to bet that all of the noise from your car and the Harley helped set off the sensors. I'm getting the CEL now without even getting into boost, and that's with 100 octane gas making up at least a third of my fuel mix. So, I really think that with a heavily modified engine, the sensors can be set off by a lot of things besided knocking and pinging. It also seems to vary by car, because there are a number of people who aren't having these problems all the time. Of course, they are mostly people who can get access to gas with higher octane levels than is generally available here in CA.
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Postby kondo » Tue Mar 09, 2004 4:13 pm

yep i think it was a combo of my car my stereo on full blast and the harley, I am just hoping that it was a warning and that the sensors are not blown cause i just spent like $800 getting them fixed. I have considered the bigger injectors and fuel pump but I am not sure exactly what setup to go with. I think as long as I stick to the stock pulley I wont have any probleoms. The funny thing is I bought 5 gallons of VP 100 to run and I was going to wait till I went to the track to test it, but since reading that does not help either I am not sure what to try next.
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Postby Eric » Tue Mar 09, 2004 8:59 pm

The rear knock sensor on supercharged V6 cars does not funtion correctly and will always send a false and premature detonation signal to the ECU causing the limp mode and check engine lights. This information was given to me by TRD directly, as that is where I had the supercharger installed in my 99 Solara. At the very least it always causes the timing to retard prematurely and kills alot of the power on the bottom end.

The false signal is caused by mechanical resonance in the supercharger itself. The knock sensors are nothing more than a piezo microphone of sorts that listen for high frequency energy that signals detonation. Pre-ignition is knocking and detonation is a high frequency ping. The high frequency energy of the supercharger sets off the knock sensor.

I completed the modification that was suggested and the cars drivability improved dramatically and no more check engine lights. I was constantly disconnecting the battery to reset the ECU to original settings to get my power back.

The fix: Thee are two knock sensor inputs on the ECU one for the front sensor and one for the rear sensor. Connect the output of the front knock sensor to both inputs on the ECU. This takes about a whopping 20 minutes to complete.

Another modofication that improves drivability is to replace the coolant thermostat with a 160 degree aftermarket thermostat. This fakes the ECU into thinking the car is still not fully warmed up and it gives you a richer mixture improving driveability and reduces possability of detonation.
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Postby cdssolara » Wed Mar 10, 2004 12:50 am

kondo wrote:yep i think it was a combo of my car my stereo on full blast and the harley, I am just hoping that it was a warning and that the sensors are not blown cause i just spent like $800 getting them fixed. I have considered the bigger injectors and fuel pump but I am not sure exactly what setup to go with. I think as long as I stick to the stock pulley I wont have any probleoms. The funny thing is I bought 5 gallons of VP 100 to run and I was going to wait till I went to the track to test it, but since reading that does not help either I am not sure what to try next.


Within a half hour of responding to your post, I found myself at a stop light next to a Harley. I couldn't help thinking of your exprerience and wondering if I would get a CEL. Sure enough, when the light turned green, I hadn't even shifted into second gear before the CEL came on; and we weren't racing. My knock sensors are setting off the CEL every day now. I've got to get these sensors relocated, or find some less sensitive sensors. They seem to be picking up every sound.
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Postby 808Camry » Wed Mar 10, 2004 3:31 am

Since blowing my bank 2 sensor, it keeps coming back almost everyday for me, even when I'm not boosting. So I agree just the plain abuse on teh engine and the noise from the SC sends false noise to the sensors, I'm probably going to cut my bank 2 sensor output and input bank 1 sensor into both inputs. Cause I know I'm not knocking with just 4 PSI and my SAFC II making adjustments.
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Postby Mole » Wed Mar 10, 2004 10:05 am

geeze... this is starting to get severe...

sound proof the engine bay
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Postby SC V6 » Wed Mar 10, 2004 11:41 am

why doesn't someone just make a knock sensor simulator.. where all u have to do is cut the wire going into the ECU and make sure it has the same amperage as a regular knock sensor running good hearing nothing... that would work.. and it would solve problems,
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Postby Mole » Wed Mar 10, 2004 4:09 pm

you can do that, but would you want to risk it? if there is some serious knocking going on, it wouldn't report to the ecu since its being tricked as if everything is running well.
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