james.jamble New Member 8 Member For: 9y 6m 27d Posted 15/05/15 02:58 AM Share Posted 15/05/15 02:58 AM Hey guysI have a bf2 with ZF auto. It makes 372kw at 20psi. When I hold flat and the gearbox changes gears the boost spikes from anywhere from 23 to 26 psi. While it's in gear it's perfectly fine though. Is this normal with the auto? Is it something I should be worried about?And are there ways to fix this?If it matters It has 4 inch dump pipe to 3.5 exhaust and complete plazmaman intercooler kit. Hot/cold side and 4" intake where battery used to be. Stock turbo. Link to comment Share on other sites More sharing options...
discostig Manual mode ________________________ All day, erryday Donating Members 13,798 Member For: 17y 2d Gender: Male Location: Probably above atmospheric pressure Posted 15/05/15 04:00 AM Share Posted 15/05/15 04:00 AM (edited) NormalThis is a stock BFIIAs for fixing it, Nizpro have an overboost valve you can set to crack at desired pressures but it's a bit exxy. Edited 15/05/15 04:02 AM by -Stever- Link to comment Share on other sites More sharing options...
boost69 Donating Members 737 Member For: 19y 6m 8d Posted 15/05/15 04:17 AM Share Posted 15/05/15 04:17 AM It's normal for boost to spike between gear changes on an auto... Link to comment Share on other sites More sharing options...
james.jamble New Member 8 Member For: 9y 6m 27d Posted 15/05/15 06:55 AM Author Share Posted 15/05/15 06:55 AM So I shouldn't be worried about it at all? I just thought 6 psi extra is a bit much. Link to comment Share on other sites More sharing options...
JETURBO ...JD TUNING ADELAIDE... Gold Donating Members 23,708 Member For: 16y 5m 27d Gender: Male Location: Adelaide Posted 15/05/15 07:05 AM Share Posted 15/05/15 07:05 AM Mate 6psi ontop of 20 is fhuck loads to much It will go bang sooner or later with that much psi 370rwkw off 20psi is as gay as my haircut, way to much boost for power Sounds like u need to visit a reputable workshop for a re tune 3 Link to comment Share on other sites More sharing options...
FiftyOne Bronze Donating Members 1,145 Member For: 11y 4m 25d Gender: Male Posted 15/05/15 08:52 AM Share Posted 15/05/15 08:52 AM 20 pound is way high. Just sayn. Spikes are a norm thing though. There is a time required to get the diverter valve to open Link to comment Share on other sites More sharing options...
discostig Manual mode ________________________ All day, erryday Donating Members 13,798 Member For: 17y 2d Gender: Male Location: Probably above atmospheric pressure Posted 15/05/15 01:33 PM Share Posted 15/05/15 01:33 PM Good point by Jet, forgot to step back and look at the overall picture of boost for power delivered. Link to comment Share on other sites More sharing options...
james.jamble New Member 8 Member For: 9y 6m 27d Posted 17/05/15 12:34 AM Author Share Posted 17/05/15 12:34 AM It was tuned by castle hill performance. I thought they were recommended. Link to comment Share on other sites More sharing options...
james.jamble New Member 8 Member For: 9y 6m 27d Posted 17/05/15 03:43 AM Author Share Posted 17/05/15 03:43 AM Would 18 psi be more appropriate? Link to comment Share on other sites More sharing options...
bjc Donating Members 2,823 Member For: 21y 2m 23d Gender: Male Location: Townsville Posted 17/05/15 10:36 AM Share Posted 17/05/15 10:36 AM If the wastegate hasn't been ported then this will be why the high boost vs power is what it's at... Either that or your commenting peak boost and not boost at peak power? Link to comment Share on other sites More sharing options...
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