Is it possible to get lower boost in 1st gear on auto?
Is it possible to get lower boost in 1st gear on auto? Combating my traction problems I thought about decreasing boost in 1st gear (auto tranny). Is this somehow possible? I know PCM knows what gear is the tranny in, is it somehow possible to get that output to boost controller?
Or to retard timing in PCM itself maybe, although that would create a lot of boost and heat...
Any ideas?
Or to retard timing in PCM itself maybe, although that would create a lot of boost and heat...
Any ideas?
Combating my traction problems I thought about decreasing boost in 1st gear (auto tranny). Is this somehow possible? I know PCM knows what gear is the tranny in, is it somehow possible to get that output to boost controller?
Or to retard timing in PCM itself maybe, although that would create a lot of boost and heat...
Any ideas?
Or to retard timing in PCM itself maybe, although that would create a lot of boost and heat...
Any ideas?
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
Your easiest way is to fit a solenoid into the boost control plumbing and arrange it so you only achieve wastegate pressure only with the solenoid energised
Although you'd need to figure how to ensure it only happened in 1st gear. Ive no idea whether the OEM ecu is capable of that or not.
Or you could just wire it to a simple push switch inside the car, say on the gearstick or something.
Just hold it down and low boost is enabled. Let go and it's normal
Although you'd need to figure how to ensure it only happened in 1st gear. Ive no idea whether the OEM ecu is capable of that or not.
Or you could just wire it to a simple push switch inside the car, say on the gearstick or something.
Just hold it down and low boost is enabled. Let go and it's normal
Your easiest way is to fit a solenoid into the boost control plumbing and arrange it so you only achieve wastegate pressure only with the solenoid energised
Although you'd need to figure how to ensure it only happened in 1st gear. Ive no idea whether the OEM ecu is capable of that or not.
Or you could just wire it to a simple push switch inside the car, say on the gearstick or something.
Just hold it down and low boost is enabled. Let go and it's normal
Although you'd need to figure how to ensure it only happened in 1st gear. Ive no idea whether the OEM ecu is capable of that or not.
Or you could just wire it to a simple push switch inside the car, say on the gearstick or something.
Just hold it down and low boost is enabled. Let go and it's normal
Also any solenoid will burn very fast if constantly engaged so it would be better to energize it in 1st gear only to bleed off some pressure, I guess
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Like this.... 
Teching In
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TECH Apprentice
Joined: May 2006
Posts: 311
Likes: 3
From: Omaha,Ne
Here is your clue..you have what you need to decode first gear, for your boost controller.
I have boost by gear and it works!!!
but, I am running a Microsquirt on my 4l80, it talks(can bus) to the MS3, and the MS3 controls boost by gear.
I have boost by gear and it works!!!
but, I am running a Microsquirt on my 4l80, it talks(can bus) to the MS3, and the MS3 controls boost by gear.
If he is using hondata K-Pro he does have boost by gear with the factory pcm. If wont control auto trans tho.
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
Yes that's what I'm trying to figure - how to get electrical signal when tranny is in 1st gear. Push switch is fine but you can't really know when tranny switches into 2nd or back to 1st on bad track, so you may end in 2nd gear in low boost.
Also any solenoid will burn very fast if constantly engaged so it would be better to energize it in 1st gear only to bleed off some pressure, I guess
Also any solenoid will burn very fast if constantly engaged so it would be better to energize it in 1st gear only to bleed off some pressure, I guess
That way you could easily have a boost reduction below say 30mph, or whatever speed.
Is there anything on the car to indicate what gear is currently selected ?
Something like this would do for starters. Then use a simple solenoid on the boost control system so you only see w/g pressure
http://autospeed.com/cms/title_Frequ...0/article.html
http://autospeed.com/cms/search/inde...switch&x=0&y=0
http://autospeed.com/cms/search/inde...switch&x=0&y=0
or possibly one or two of the switches. ie, above 4000rpm and below 40mph activates low boost. That way it would only ever come on in 1st gear ( obviously you need to define the parameters )
Damn some of you guys rock. I asked some tips so I could use MY boost controller and you suggest me OTHER boost controllers that would cost me $1000 and still don't do what I want )) Specifically - boost by gear with auto tranny
)) Specifically - boost by gear with auto tranny BUT this boost-controller changes between Hi/Lo boost modes when it's pins are shorted momentarily, so I need to solve this electric puzzle nowstevieturbo, yes, thought of getting frequency signal from front ABS sensor, but still it's not very accurate since tranny can shift early for instance and I'll be in low boost in high gear
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
it seems so BUT this boost-controller changes between Hi/Lo boost modes when it's pins are shorted momentarily, so I need to solve this electric puzzle now
stevieturbo, yes, thought of getting frequency signal from front ABS sensor, but still it's not very accurate since tranny can shift early for instance and I'll be in low boost in high gear
BUT this boost-controller changes between Hi/Lo boost modes when it's pins are shorted momentarily, so I need to solve this electric puzzle nowstevieturbo, yes, thought of getting frequency signal from front ABS sensor, but still it's not very accurate since tranny can shift early for instance and I'll be in low boost in high gear
Cant the factory ecu do anything like this ? As I said, is there any sort of visual indicator to tell you what gear you are in as some modern setups can have ?
I guess I should clarify, my friend's car was a stick and he was running hondata and all that jazz. Sorry for leading anyone the wrong direction. He did have boost by gear though. If I remember right 1st and 2nd were like 4 or 5 pounds 3rd was 8ish and then 4-6 were the full 12. It wasn't a crazy setup by any means since he was on a stock block and internals. He got rid of that car a few years ago and just has a stock s2k now. He got tired of fixing stuff all the time.