Walbro and KR questions
#1
Walbro and KR questions
First off I finally got around to putting in the Walbro I've had and it seems like the car is running rich.
Have any of you guys noticed a spike in fuel pressure or had to retune because of adding a pump?
My old one was really noisy, so I'm assuming it was fairly weak.
Second, I now am picking up around 4 degrees of knock retard at WOT.
Wondering if the added fuel (if it really is way richer) could be cause knock retard. I know that sounds backwards, but I've seen it several times tuning LS engines. When they're way too rich they wont take any timing without seeing KR, then when you get the AFR close to where it wants to be, the car will take more timing.
Car definitely feels weaker and I want to get this lined out.
I beat up on a cam, stalled, nitrous (150 shot) CTS V tonight, and a stalled, bolt on, 150 shot G8 GXP. I got a fast *** truck to race tomorrow night and want to get it running a little better.
Thanks
Have any of you guys noticed a spike in fuel pressure or had to retune because of adding a pump?
My old one was really noisy, so I'm assuming it was fairly weak.
Second, I now am picking up around 4 degrees of knock retard at WOT.
Wondering if the added fuel (if it really is way richer) could be cause knock retard. I know that sounds backwards, but I've seen it several times tuning LS engines. When they're way too rich they wont take any timing without seeing KR, then when you get the AFR close to where it wants to be, the car will take more timing.
Car definitely feels weaker and I want to get this lined out.
I beat up on a cam, stalled, nitrous (150 shot) CTS V tonight, and a stalled, bolt on, 150 shot G8 GXP. I got a fast *** truck to race tomorrow night and want to get it running a little better.
Thanks
#4
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I think it is possible to cause some problems to the tune. I would hook up a wideband and go from there
#5
If his old,stock pump was only capable of pushing lets say 30psi and he tuned it with that going on and now he has a new pump, the regulator would still allow it to bump up to 43. psi, which would add extra fuel.
I think it is possible to cause some problems to the tune. I would hook up a wideband and go from there
I think it is possible to cause some problems to the tune. I would hook up a wideband and go from there
very good point. pretty sharp for this early in the a.m. Im still half asleep, but id agree 100%
#6
That's what I'm thinking, if the old pump was never pushing the limit of the regulator and this one is now. IDK
Cant figure out why I picked up KR either, this is the only thing that has changed. Well besides a clutch.
Maybe the new clutch is loading the engine harder. IDK
Cant figure out why I picked up KR either, this is the only thing that has changed. Well besides a clutch.
Maybe the new clutch is loading the engine harder. IDK