less boost after wastegate adjustment Topic is solved

Post by **jblackburn** » 05 May 2011, 21:07

From a cold start, drive gingerly under 2000 rpm for 5 minutes. Half the boost level is 5 psi. I borrowed a boost gauge from a friend with an rx7 to help calibrate mine, but really keepin it under 3500 rpm at a bit less than half throttle seemed to do the trick for me.

Post by **Juan62** » 06 May 2011, 04:47

Still confused... Do I pull over at a dead stop and accelerate the car up to 5 psi and hold for 5-7 seconds? or do I drive on normal street fro 5 minutes, then get to highway and accel to 5 psi, then decel to 30 mph../.and repeat this process 4 times, go home, turn off engine for 12 minutes...then do all over again (second time)?

Post by **jblackburn** » 06 May 2011, 06:57

Second one.

Post by **LamboSE5** » 30 Jun 2011, 12:45

Good thread.

I'm surprised that CBV (diaphragm) wasn't in that list of things that could cause low boost.
Now, I'm not as sure (as I thought I was) about my issue being the CBV diaphragm. I have this strange problem with boost pressure. It's like late, fluttery, (or maybe just low) boost. It seemed like something that could stem from a torn or old "hole-y" diaphragm.

It's difficult for me to describe. I made a (very) long post in which this was one of the problems I listed. I'll find it and link (if anybody cares to perhaps...speculate or suggest

) to it.

Also, very much related if not the same problem, is; If I press the gas peddle to any specific position, arriving at that position quickly, and then hold it exactly there, I notice that the RPMs go up and over where they seem they should be - because then then they fall below where they should be, and then (if I remember correctly) they go back up and level off somewhere in the middle of the two.

Doing the same thing, usually from a stop and only giving it enough gas to accelerate normally (not trying to burn rubber or anything AT ALL) the car/power/boost will stutter... much like the equivalent of a person stuttering I suppose. So... if someone who were not used to driving my car were to accelerate from a red light, for example, they might feel the initial small amount of peddle pressure was insufficient and press it more only to then accelerate more than wanted because the boost/power was "catching up" to the initial gas peddle press. If that makes sense.

I know - I need a code reader. I really do.
Broke right now though.

Thanks for this thread. Glad John20 got it sorted out!

Post by **Juan62** » 01 Jul 2011, 06:17

Lambo, you may need to change your CBV (spring). IPD has an HD-kit with three type springs. Get it installed.

Post by **jblackburn** » 01 Jul 2011, 07:11

^If you're not holding boost, that is one of two possible reasons, and a good improvement anyway. I've got one waiting to go in my car, but I haven't had time to get around to it.

Also, very much related if not the same problem, is; If I press the gas peddle to any specific position, arriving at that position quickly, and then hold it exactly there, I notice that the RPMs go up and over where they seem they should be - because then then they fall below where they should be, and then (if I remember correctly) they go back up and level off somewhere in the middle of the two.

Um...take a video maybe? Sounds like the torque converter in 2nd/3rd gear doing its job. It tries to put the engine in its torquey powerband (2500-a tad over 3500 RPM) until the transmission catches up.

Post by **Juan62** » 01 Jul 2011, 09:43

My newHD TCV and CBV from IPD has finally trained itself, or me being the trainee. Took it after reset and followed instructions. Finally got it up to 14psi and held 7-10 seconds. The furthest its ever been, using the new CBV spring (RED). One day, I may put the blue in. This does include IPD ECU upgrade (years ago, and custom dual exhaust). NO tires smoking yet, even at takeoff, and while the wastegate was set at two full turns. Dunno if thats good or bad. CAM checking/adjustment next I guess.

dbm123 · Post by **dbm123** » 01 Jul 2011, 12:41

jblackburn wrote:From a cold start, drive gingerly under 2000 rpm for 5 minutes. Half the boost level is 5 psi. I borrowed a boost gauge from a friend with an rx7 to help calibrate mine, but really keepin it under 3500 rpm at a bit less than half throttle seemed to do the trick for me.

I went through this learning routine with mine and my city gas mileage went from 21 mpg to 12 mpg. jblackburn recommended rebooting the ECU... which I did and my gas mileage went back to normal. Should I have gone through the "learning" sequences again after rebooting the ECU???

dbm123 · Post by **dbm123** » 10 Jul 2011, 22:40

Still interested in opinions about my question....

Post by **LamboSE5** » 17 Aug 2011, 07:22

Juan62 wrote:Lambo, you may need to change your CBV (spring). IPD has an HD-kit with three type springs. Get it installed.

I plan on the new diaphragm and spring when I can, from vivaperformance (mitsubishi 'upgrade'). I can't do IPD, I live in Canada, and they have...freakin' rediculous shipping costs. I'll continue to say so until they change that

jblackburn wrote:^If you're not holding boost, that is one of two possible reasons, and a good improvement anyway. I've got one waiting to go in my car, but I haven't had time to get around to it.

Also, very much related if not the same problem, is; If I press the gas peddle to any specific position, arriving at that position quickly, and then hold it exactly there, I notice that the RPMs go up and over where they seem they should be - because then then they fall below where they should be, and then (if I remember correctly) they go back up and level off somewhere in the middle of the two.
Um...take a video maybe? Sounds like the torque converter in 2nd/3rd gear doing its job. It tries to put the engine in its torquey powerband (2500-a tad over 3500 RPM) until the transmission catches up.

I'll try n' do that if I get the chance soon