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NG900 & OG9-3 Performance, Mods & Tuning Covers Tuning & Performance modifications for the NG900 (1994 to 1998) & OG9-3 (1999-2002) & '03 Convertible

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  #1  
Old 20th September 2013
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The Ridge The Ridge is offline
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Default Tune a rev hang remedy?

I was wondering if anyone had noticed a reduction in rev hang (rpm's hold for a second when shifting) after having a tune done/installed. Its getting on my nerves. Its looking like my DIC is starting to die but I do not think they are connected as the hang has been there since I bought it (8months).
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  #2  
Old 20th September 2013
ranzeroxklaus ranzeroxklaus is offline
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Quote:
Originally Posted by The Ridge View Post
I was wondering if anyone had noticed a reduction in rev hang (rpm's hold for a second when shifting) after having a tune done/installed. Its getting on my nerves. Its looking like my DIC is starting to die but I do not think they are connected as the hang has been there since I bought it (8months).
couldnt you like shave the flywheel at a machine shop?
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Old 20th September 2013
BobSaabit BobSaabit is offline
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I think it's a T7 thing. I've been trying to pin it down, as have others... no one seems to have a solution. It's not shift technique as I drive my T5 the same way and it doesn't happen - although getting off the throttle as soon as you can helps. It's not the BPCv and I don't think it could be the BOV (although I've been thinking of swapping just to check).

It has been suggested that it's there to make sure you burn the gas when you go off throttle, but I can easily jump 500 RPM on a shift. That's way too much.
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Old 20th September 2013
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Originally Posted by BobSaabit View Post
I think it's a T7 thing. I've been trying to pin it down, as have others... no one seems to have a solution. It's not shift technique as I drive my T5 the same way and it doesn't happen - although getting off the throttle as soon as you can helps. It's not the BPCv and I don't think it could be the BOV (although I've been thinking of swapping just to check).

It has been suggested that it's there to make sure you burn the gas when you go off throttle, but I can easily jump 500 RPM on a shift. That's way too much.
I was hoping doing the bpcv bypass would help, guess not. I know its part of the OEM programming to do exactly what you are saying. They have it overrun to burn off remaining fuel. Its totally annoying though. Makes casual driving less smooth. I have no doubt its a T7 thing as it probably relates to some MAF and drive by wire values. The T5 wouldnt be able to do it without really manipulating the IACV.
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Old 21st September 2013
saabkid37 saabkid37 is offline
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http://trolltuner.com/?p=219

do that.

made a large difference on my old viggen.
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Old 21st September 2013
BobSaabit BobSaabit is offline
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Originally Posted by saabkid37 View Post
http://trolltuner.com/?p=219

do that.

made a large difference on my old viggen.

I tried that - no difference at all in the rpm rise on shift. I'd be interested if The Ridge gets different results.


I wouldn't mind so much if it was just an RPM hang, but I get 200-500RPM boost.
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Old 21st September 2013
saabkid37 saabkid37 is offline
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oh i didnt read the part where you had a climb in rev's and he had a hang. that mod definitely works for a hang, as it takes ecu action out of the circuit.
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Old 22nd September 2013
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I'm grasping at straws, but It's not a vacuum leak is it.?

every now and again I pop a vac hose and I can tell straight away because my revs hang and go up a bit .....

I put the vac hose on again ...Presto.
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Old 22nd September 2013
BobSaabit BobSaabit is offline
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I'm grasping at straws, but It's not a vacuum leak is it.?

every now and again I pop a vac hose and I can tell straight away because my revs hang and go up a bit .....

I put the vac hose on again ...Presto.
I've checked and rechecked... my hoses are new... unless it's something like the BOV with a funky external leak. It seems to close properly when manually tested.

Maybe I will go over it again...
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