Need some thoughts on this. Totally could be me... Maybe it's because this world of supercharged cars is new to me and I oversold my personal expectations ... but I do have a history with cars and building them and something seems "wrong", or at least "not right"...
I have a new Whipple 2.9 on a 2012 w/ big TB and BAP. (Stage 3 setup - for details see build thread)
How do you know if the bypass valve is not closing under boost or only closing partway (or fluttering)? I'm asking because of the size of the TB and intake, you can't see the bypass valve like the manual says to check that it's opening and closing...
Tonight I installed an Autometer boost/vac gauge spliced into the BAP line - to help troubleshoot this...
Sometimes when you get on it there's almost a "surging" that feels like boost / no boost...
Tonight with the gauge I did 4 hard hits to about 3/4 throttle on some country roads, here's what each one did:
* got the weird surge 1 time and the boost gauge was about 3-5psi
* had a really hard pull, SC really made that sweet whine sound, gauge showed 9psi. This was awesome...
* 2 others were "smooth" w/o surge but didn't feel as strong and the gauge was at 5psi
(It IS possible I hit it harder / faster the one time I got full boost, it's hard to look at RPMs, boost, same petal pressure and not hit something)
I feel like I'm going crazy... to me, this seems like the power difference and the whine / lack of whine suggests the bypass... but I have NEVER even heard of that as an issue...
The other question is - could a bad auto transmission part of the tune cause the surging (I know that wouldn't cause the boost psi differences tho)
Last data point - everyone talks about how with this blower I'm gonna need new wheels and the cheap Goodyears I have now should never hookup, even with traction control on... um, from a full stop, 100% drop the hammer WOT, with traction control on... the tires will break free, some... stock 18" and 3.15 gears. My built up expectation was w/ 93 octane - 1st would make rubber pudding for me... so... maybe people exaggerate, dunno.
FWIW - I have a dyno session set up for May 11 - but if it's something mechanical, that's a waste. I schedule the dyno to figure out if it's driver or vehicle!
I have a new Whipple 2.9 on a 2012 w/ big TB and BAP. (Stage 3 setup - for details see build thread)
How do you know if the bypass valve is not closing under boost or only closing partway (or fluttering)? I'm asking because of the size of the TB and intake, you can't see the bypass valve like the manual says to check that it's opening and closing...
Tonight I installed an Autometer boost/vac gauge spliced into the BAP line - to help troubleshoot this...
Sometimes when you get on it there's almost a "surging" that feels like boost / no boost...
Tonight with the gauge I did 4 hard hits to about 3/4 throttle on some country roads, here's what each one did:
* got the weird surge 1 time and the boost gauge was about 3-5psi
* had a really hard pull, SC really made that sweet whine sound, gauge showed 9psi. This was awesome...
* 2 others were "smooth" w/o surge but didn't feel as strong and the gauge was at 5psi
(It IS possible I hit it harder / faster the one time I got full boost, it's hard to look at RPMs, boost, same petal pressure and not hit something)
I feel like I'm going crazy... to me, this seems like the power difference and the whine / lack of whine suggests the bypass... but I have NEVER even heard of that as an issue...
The other question is - could a bad auto transmission part of the tune cause the surging (I know that wouldn't cause the boost psi differences tho)
Last data point - everyone talks about how with this blower I'm gonna need new wheels and the cheap Goodyears I have now should never hookup, even with traction control on... um, from a full stop, 100% drop the hammer WOT, with traction control on... the tires will break free, some... stock 18" and 3.15 gears. My built up expectation was w/ 93 octane - 1st would make rubber pudding for me... so... maybe people exaggerate, dunno.
FWIW - I have a dyno session set up for May 11 - but if it's something mechanical, that's a waste. I schedule the dyno to figure out if it's driver or vehicle!