Henz Tampon inserted, Auto Acquired, next purchase a new handbag Legacy Donating Member 9,946 Member For: 18y 6m 3d Gender: Male Location: Vic Posted 06/08/12 09:11 AM Posted 06/08/12 09:11 AM Normally 16-17 is were they start to float, and especially with that many kms. My bf2 springs showed signs of float at 17psi, then after 12months started to float at 14-15.
Robos F6 Legacy Donating Member 407 Member For: 17y 6m 21d Gender: Male Location: Vic Posted 06/08/12 10:30 AM Posted 06/08/12 10:30 AM I made 304rwkw at 13psi with just a hi flow cat as well. I then fitted 3.5 dump to the hi flow cat with no over mods. Got a re-tune done and it made 314rwkw at 15psi. The peak power only increased 10rwkw which doesnt sound much but it picked up 40rwkw in the middle which makes so much difference. The car now feels so much faster when it comes on boost. I say go for it. Still running stock valve springs. 1
XR6menace BANNED Banned 1,462 Member For: 19y 4m 26d Gender: Not Telling Location: banned Posted 06/08/12 12:01 PM Posted 06/08/12 12:01 PM Miss ya robbo
AirStrike Legacy Donating Member 387 Member For: 17y 10m 1d Gender: Male Posted 06/08/12 12:09 PM Posted 06/08/12 12:09 PM thanks for such a useful post!I don't understand, if it needs springs then do them. Why would you worry about the exhaust? I'm making 350+rwkw with a stock dump and exhaust, only upgraded cat. 1
stee3 Member 194 Member For: 15y 2m 29d Posted 06/08/12 01:31 PM Posted 06/08/12 01:31 PM I've been running ~17psi with the same springs and about 180k on the clock and no noticeable float. Just wondering what the PSI limit is with the BFll springs and is there much risk of valve damage etc?We had 420kw out of it on the dyno with the same springs.Never really thought much more about it until reading this.Im with you I have seen over 400rwkw with BF valve springs on at least 6 cars with no problems what so ever.Who is tuning your car? Something is not right mate. You have a BF manual and only 300RWKW with all the mods in your signature? - Personally I think something else is wrong, I think its your fuel pump pressure relief valve. Good luck with it!
The Outsider Legacy Donating Member 1,205 Member For: 15y 4m 8d Gender: Male Location: Burwood, NSW Posted 06/08/12 02:37 PM Posted 06/08/12 02:37 PM intune?
discostig Manual mode ________________________ All day, erryday Legacy Donating Member 13,798 Member For: 18y 9m 30d Gender: Male Location: Probably above atmospheric pressure Posted 06/08/12 03:18 PM Posted 06/08/12 03:18 PM 170,000km2007 BFII15PSI / 317rwkw (or 322 on new dyno, same tuner) since 100,000kmValves confirmed for going soft and need replacing. I often drive around under boost just to hear the flutter... might have contributed It won't happen overnight, but it will happen.
FAST-XR EVIL T Member 259 Member For: 17y 9m 14d Gender: Male Location: Liverpool NSW Posted 06/08/12 10:52 PM Author Posted 06/08/12 10:52 PM no problems with tuner, saw a 30kw drop off at top end when we went from 14 to 15psi, so we then dropped it to 13psi to be safe...thanks for the replies, looks like we can confirm that valve springs can go soft and be limited to 15psi even in a bf mkII, and upgrading the exhaust will not help much... so springs will need to be done.
STAINLESS again plz You've changed man.... Legacy Donating Member 8,142 Member For: 15y 8m 27d Gender: Male Location: 2 Fuchsia Court, Narre Warren. 3805 Posted 07/08/12 12:14 AM Posted 07/08/12 12:14 AM Or you could just do valve springs.1st reply
cizzink11 Member 352 Member For: 14y 1m 23d Gender: Male Posted 07/08/12 08:17 AM Posted 07/08/12 08:17 AM The only thing I think you will accomplish with a larger dump pipe will be a laggier turbo. The power won't go anywhere it will just come on harder at a higher rpm.
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