general tuning question about boost when compared to load and temperature
Thread Starter
Honda-Tech Member
Joined: Dec 2001
Posts: 18,151
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From: Hollywood Babylon
general tuning question about boost when compared to load and temperature
what are the effects of load when building boost? such as if you are driving on an incline or decline, will it effect how quickly max boost is reached? could this sort of thing cause boost spikes?
secondly, Ive been having some issues with boost cut recently and through troubleshooting and research, so far it seems its probably related to the colder weather. how does cold air increase the chances of boost spike? I understand that colder air is more dense and will help produce more power, but why does it seem to make boost increase? is it because the motor is making more power from the cold air, thus spooling the turbo quicker and carrying boost up to and sometimes past the boost cut?
secondly, Ive been having some issues with boost cut recently and through troubleshooting and research, so far it seems its probably related to the colder weather. how does cold air increase the chances of boost spike? I understand that colder air is more dense and will help produce more power, but why does it seem to make boost increase? is it because the motor is making more power from the cold air, thus spooling the turbo quicker and carrying boost up to and sometimes past the boost cut?
BCICAN
Joined: Jan 2005
Posts: 3,218
Likes: 1
From: Cincinnati, OH
Re: general tuning question about boost when compared to load and temperature (RTW DC2R)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RTW DC2R »</TD></TR><TR><TD CLASS="quote">what are the effects of load when building boost? such as if you are driving on an incline or decline, will it effect how quickly max boost is reached? could this sort of thing cause boost spikes?
secondly, Ive been having some issues with boost cut recently and through troubleshooting and research, so far it seems its probably related to the colder weather. how does cold air increase the chances of boost spike? I understand that colder air is more dense and will help produce more power, but why does it seem to make boost increase? is it because the motor is making more power from the cold air, thus spooling the turbo quicker and carrying boost up to and sometimes past the boost cut?</TD></TR></TABLE>
in a nut shell: cold air=denser air, denser air=more air (on the same spring), more air=more boost, more boost=boost cut. Just lower the spring or control by a couple pounds during the cold months to remede the problem. Also, the angle of incline or decline of the road should not be causing boost spikes.
secondly, Ive been having some issues with boost cut recently and through troubleshooting and research, so far it seems its probably related to the colder weather. how does cold air increase the chances of boost spike? I understand that colder air is more dense and will help produce more power, but why does it seem to make boost increase? is it because the motor is making more power from the cold air, thus spooling the turbo quicker and carrying boost up to and sometimes past the boost cut?</TD></TR></TABLE>
in a nut shell: cold air=denser air, denser air=more air (on the same spring), more air=more boost, more boost=boost cut. Just lower the spring or control by a couple pounds during the cold months to remede the problem. Also, the angle of incline or decline of the road should not be causing boost spikes.
Thread Starter
Honda-Tech Member
Joined: Dec 2001
Posts: 18,151
Likes: 2
From: Hollywood Babylon
thanks. previously before I installed my boost controller(profect B spec 2), I was tuned on just the 9lb wastegate spring. it would hit 9lbs and slowly creep up to about 12 by redline. now if I turn off the controller and just run on the spring, Im getting readings of up to 16psi on a 9lb spring. does that sound possible? getting that much more creep on the wg spring now compared to when it was warm out? or does it sound like Im getting an incorrect reading of 16psi on the controllers gauge?
BCICAN
Joined: Jan 2005
Posts: 3,218
Likes: 1
From: Cincinnati, OH
Re: (RTW DC2R)
That is possible, yes. Typically the question is: what exhaust manifold do you have and also what wastegate are you using?
- People have have creeping issues with the DRAG manifold (myself included) and also with the Deltagate wastegate as well (myself included again).
- The best way to correct this problem is buy a manifold (whether it's a log style, EQ Length, or top mount) that has the wastegate centered over all the exhaust runners (not just one like the DRAG). Also, the Deltagate wastegate can also add to the problem. A Tial 38mm is comparable and much better. Those two things will more than likely solve a creeping problem.
- People have have creeping issues with the DRAG manifold (myself included) and also with the Deltagate wastegate as well (myself included again).
- The best way to correct this problem is buy a manifold (whether it's a log style, EQ Length, or top mount) that has the wastegate centered over all the exhaust runners (not just one like the DRAG). Also, the Deltagate wastegate can also add to the problem. A Tial 38mm is comparable and much better. Those two things will more than likely solve a creeping problem.
