just bought a gsx, unlimited stutterbox????

[george5366]

well i bought a 1990 gsx a few days ago with these modifications

B16g, MBC 10psi, 190 walbro, RC 550cc, 3inch Exhaust, FMIC, 2nd gen: MAF, Exhaust Manifold, O2 housing, SAFC, Socketed Eprom Stage3, with 2g maf and 550 compensation, Stutterbox at 5,000 rpm


well for a whole day i was boost leak testing the gsx, found leaks, and fixed them. well it still sputters funny like no power after 5,000 rpm. it got me thinking too, i noticed it only does it exactly at 5,000 rpms. that is were my stturbox stops me. is it like unlimited sttuter or wtf? i check the clutch pedal to see if its hitting that little switch and it does. so wtf? is the ecu retarded or what? i looked at the safc that it came with and it has no settings all zeroed out. its only boosting 10 psi also.

ok is the stturbox only suposed to come on when the clutch is engaged right? or can it also do it at a stop without pressing the clutch pedal? because mine still does it at a stop without me stepping on the clutch? any ideas?

 

[eclipsegsx1736]

That's a high stutterbox setting for FWD. It all depends on how the car was wired up. What was he using for the stutterbox? MSD igniton? ECU? It can be wired to anything; a button, switch, clutch pedal, whatever. I have mine to the clutch pedal and a switch so that I can disable it completely if I want.

EDIT: oops nvm the first sentence. Acually it's a pretty low setting for AWD

 

[george5366]

no its not fwd, i bought a 1990 gsx
B16g, MBC 10psi, 190 walbro, RC 550cc, 3inch Exhaust, FMIC, 2nd gen: MAF, Exhaust Manifold, O2 housing, SAFC, Socketed Eprom Stage3, with 2g maf and 550 compensation, Stutterbox at 5,000 rpm

 

[george5366]

anyone?
even when rolling if i just step on the gas its like a diferent tone when it gets to 5,000.

 

[olmytsi]

I would contact the owner and ask him about it. He will tell you if it did it when he drove it. You didn't test drive the car with him and take it past 5k? It could be the rev limiter set via the chip and you have to ask him how to change it to a higher value or check the website if you know which company your chip is from.

 

[george5366]

its weird, i dont know what it is, i tried disconnecting my speedo cable since that is what it goes by, and with that it stops me harder and keeps me there in gear at 5,000. so i hooked it back up. its weird it just looses all power, it still goes up but way slow but with no power. i lowered my boost to see what would happen but nothing,
in 5th gear at 55mph i floor the gas and it pulls me with all boost how it should untill it hits 5,000 then it just goes weird.

also when rolling in neutral and with no boost i step on the gas slowly right when it gets to 5,000 its like different tone.
help anyone?

 

[daren_p]

Not sure how they get the signal with your eprom chip but sounds like the wiring or clutch switch is bad.

 

[george5366]

ok i dont think its the speed cable because if i take it off it stops me even harder it actually holds me there while in gear, with it on it stops me but it lets me climb rpm slowly. i dont think it has step3 it has step 2.

 

[george5366]

can this also be signs of the coil pack going out also? i changed plugs and wires already

 

[george5366]

anyone?

 

[olmytsi]

Did you look into the chip by asking the previous owner like i suggested?

 

[olmytsi]

Or try putting the stock chip back in just to see what happens.

 

[george5366]

i cant contact the old owner, and i odnt have the stock chip, one thing though can it be possible that the knock sensor is bad? and is messing me up at that rpm?

 

[Eric_7810]

if it was the knock sensor your car would just be being robbed of all its power from timing loss, it would sound nothing like a stutterbox

 

[olmytsi]

Again, it's the stutterbox which means it's your chip/clutch wiring. Borrow an ecu from a friend (or a local dsmer that you can find on your local dsm club or here) and try it.

 

[george5366]

well it doesnt sound like a stutterbox, i thought it did, but more i listen to it it weird it feels like power is just gone
i did a quick log
rpms timing
3450 15
3513 15
3638 16
3764 17
3827 17
3889 17
3952 17
4015 18
4140 18
4203 18
4360 18
4297 18
4360 18
4454 18
4391 18
4454 18
4485 18
4454 18
4611 18
4580 18
4548 18
4580 18
4705 18
4705 19
4674 18
4768 19
4862 19
4862 21
4893 23
4956 23
4893 21
4987 20
5019 22
5050 22
4987 21
5050 20
5019 20
5113 22
5207 24
5144 24
5207 20
5144 19
5301 20
5332 22
5301 22
5332 22
5395 23
5364 23
5332 23
5332 24
5489 24
5301 25
5458 25
5489 26
5458 25
5427 25
5521 27
5521 24
5583 25
5615 25
copied it exactly how my logger gave it to me
i am also very new at tuning also, but these numbers dont look right

 

[olmytsi]

That won't show anything. You have to at least be able to tell us if its a stutterbox or no.

 

[george5366]

it is not the stturbox, its only a 2 step and it comes off once i am rolling, because it doesnt hold me there like it did when i disconnected my speedo cable, heres another log
rpm 02v timing air flow
3137 .89 14 53.00
3168 .89 15 54.00
3231 .89 16 55.00
3293 .89 16 56.00
3387 .89 16 57.00
3482 .89 16 58.00
3576 .89 17 60.00
3607 .89 18 60.00
3670 .89 18 61.00
3733 .89 19 62.00
3827 .89 19 64.00
3921 .89 19 65.00
3952 .89 20 65.00
4078 .89 20 66.00
4109 .89 20 68.00
4140 .89 20 69.00
4203 .89 19 71.00
4297 .89 20 71.00
4329 .89 20 73.00
4391 .89 20 74.00
4454 .89 19 76.00
4548 .89 19 75.00
4580 .89 19 75.00
4642 .89 19 78.00
4799 .89 19 79.00
4736 .89 20 78.00
4862 .87 21 79.00
4862 .89 19 80.00
4956 .89 18 82.00
4987 .89 19 82.00
5019 .89 19 84.00
5176 .83 23 81.00
5176 .87 22 82.00
5207 .87 20 81.00
5176 .77 23 81.00
5270 .87 22 84.00
5364 .85 23 78.00
5270 .85 23 75.00
5332 .85 23 81.00
5427 .85 22 83.00
5395 .81 22 77.00
5521 .81 23 76.00
5521 .79 23 77.00
5552 .81 24 77.00
5583 .77 24 78.00
5583 .81 22 76.00
5552 .79 21 79.00
5677 .77 21 77.00
5740 .79 23 79.00

 

[olmytsi]

2 step is a stutterbox. Again, a log won't show anything. Either you try another ECU or at least make a video or sound file of what it sounds like when it happens. I say try another ECU.

 

[kelvinb]

2 step is a stutterbox. Again, a log won't show anything. Either you try another ECU or at least make a video or sound file of what it sounds like when it happens. I say try another ECU.

isnt it weird that after 5k his 02 readings dont stay a steady .89?

 

[olmytsi]

Well, if it's running lean at that point, than no it's not weird.

 

[steve]

Showing us the Injector Pulse Width in the log might be more helpful.

Steve

 

[george5366]

a good friend said, if it was the ecu trying to hold me back the timing wouldnt be so advanced, it would be the opposite. i went and reached around back to my knock sensor and had a nice trail of goo coming from it. i ordered a new one from extremepsi along with an 02 sensor, since i dont know how long the one h i have has been there.
i also looked at my log for knock from the logger and i got this
rpm o2 knock
4862 0.89 1
4956 0.89 1
4987 0.89 0
5019 0.89 0
5176 0.83 0
5207 0.87 1
5176 0.77 1
5270 0.87 1
5364 0.85 0
5270 0.85 2
5332 0.85 2
5427 0.85 4
5395 0.81 4
5521 0.81 3
5521 0.79 3
5552 0.81 3
5583 0.77 2
5583 0.81 6
5552 0.79 5
5677 0.77 5
5740 0.79 7
5709 0.79 6
5740 0.81 6
5772 0.81 6

 

[Musclebishi]

I think you should try looking at the wiring on your stutter box. I had that same problem when I wired my in. Make sure pin 104 is completely cut and no ground is touching it except the wire that came with the chip. The long wire (stutter box wire) should be connected to pin 104 wire going to the ecu. When it is grounded you will have what you described, will only rev to 5krpm whether you press the clutch in or not. On the other side of the wire that you connect to pin 104 should have two wires, one have a diod and the other one don't. Cut the green or blue wire coming from the clutch switch connector and connect the one with the diod to the blue or green wire comming from the clutch switch and the other wire to the green or blue wire going to the harness wire. This hopefully should fix your problem. If I'm not making myself clear, check TMO web site to see how the wires are connected for better reference. I am pretty sure the stutter box wire was install wrong or it is grounded by not cutting pin 104 wire completely. Hope this helps.

 

[george5366]

thats the thing it does let me go pass it, if i hold on the gas it will let me go pass 5k, but hwen it does it has like no power, like if its knocking. it goes into a different tone, even when rolling, when the stutter box desanges while rolling, ill put it in neutral step on the gas and when it hits around 5k it goes into a different tone, with no boost no nothing, but it will still pass 5k but when it does it will sound different. anybody??? knock sensor?