First Start E85-16lbs Smoothboost & IW

[Ruiner46]

Sounds like throttle timing might be a better way to deal with the aggressiveness no?

Not really, it's all about the transition from vacuum to slight amounts of boost, which can vary in throttle position depending on rpm, load, etc. Basically, it doesn't always happen at the same throttle position. Maybe it could be managed with the torque tables and/or speed density model in the tune, but it seems like it would be simpler to just slow the action of the bypass valve by controlling it with an actuator like the smoothboost. I've tried using a restrictor in the vacuum line, but I didn't find a good size for a restrictor in the limited amount of testing I've done.

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[DougS550]

I don't have the need to run the boost up and down alot. I just use the accelerator pedal for that. My setup is simpler I suppose.

Even when I was 11lbs on 93 I didn't like the vacuum bypass valve erratic spontanious. opening and closing. It just wasn't a smooth boost increase but rather all at once boost which I did not like. I guess I'm just picky.

 

[illtal]

Even when I was 11lbs on 93 I didn't like the vacuum bypass valve erratic spontanious. opening and closing. It just wasn't a smooth boost increase but rather all at once boost which I did not like. I guess I'm just picky.

I only got throttle surge on my 2650 on cruise pulling a hill in high gears. The vacuum pill did help with slowing the response on regular driving. But I guess it's not the same for auto and manual cars.

 

[illtal]

Not really, it's all about the transition from vacuum to slight amounts of boost, which can vary in throttle position depending on rpm, load, etc. Basically, it doesn't always happen at the same throttle position. Maybe it could be managed with the torque tables and/or speed density model in the tune, but it seems like it would be simpler to just slow the action of the bypass valve by controlling it with an actuator like the smoothboost. I've tried using a restrictor in the vacuum line, but I didn't find a good size for a restrictor in the limited amount of testing I've done.

Auto or manual?

 

[Ruiner46]

Auto or manual?

Manual - T56 swap with a Whipple 2.9

 

[DougS550]

I only got throttle surge on my 2650 on cruise pulling a hill in high gears. The vacuum pill did help with slowing the response on regular driving. But I guess it's not the same for auto and manual cars.

I didn't notice you have a manual. If mine was a manual I am pretty sure I wouldn't have or even notice this issue

 

[Torinate]

I’m in for the results on the smooth boost!

Love the idea… not the price tag though! They’re not cheap!

 

[DougS550]

I’m in for the results on the smooth boost!

Love the idea… not the price tag though! They’re not cheap!

Well, I look at it this way. The boost bypass valve needed to be high quality and reliable. I actually think for what I got for my money was well worth it and priced accordingly. But that's just me for I only buy or try to buy the highest quality par6s for I cannot afford for them to prematurely fail. Pay once replace once. Hopefully. Lol

 

[Torinate]

That’s why I’m in for the differences it makes with your setup.

So basically for me though, in funny Canadian dollars I’m looking at almost 3k because I’ll need the controller and a new tune and device to do it right. That’s with me installing. So it’s a chunk of money.

But if it works…

 

[DougS550]

That’s why I’m in for the differences it makes with your setup.

So basically for me though, in funny Canadian dollars I’m looking at almost 3k because I’ll need the controller and a new tune and device to do it right. That’s with me installing. So it’s a chunk of money.

But if it works…

I already had my tuning device and Wengerd for all of tunes. And since Canada has more cooler days then me here in Indiana nd I can see traction being an issue.

 

[John Papageorgiou]

My car started and idled absolutely smooth and It has never done that before on the Whipple bypass. If it works like I think it will, I will be able to do WOT runs with TC OFF at minimum setting without having to worry about curbs or ditched. Then I would be able to turn it up a little at a time to find that "Safe" WOT sweet spot for driving on the street.

I have a whippled 10R80 s550 in Australia. Are these smooth boost bypass kits tunable via the factory ecu for say boost by gear? Wengerd has remote tuned my car so I'd get him to do the follow up tunes with smooth boost if possible.

 

[wingnutt]

I have a whippled 10R80 s550 in Australia. Are these smooth boost bypass kits tunable via the factory ecu for say boost by gear? Wengerd has remote tuned my car so I'd get him to do the follow up tunes with smooth boost if possible.

devils advocate here…but maybe just buy a centrifugal instead, and not need all the accoutrements to make it act like one

 

[Ruiner46]

devils advocate here…but maybe just buy a centrifugal instead, and not need all the accoutrements to make it act like one

Are you trying to tell us that the max boost of a centrifugal isn't controlled by the size of the pulley? Can you control boost by gear with a centrifugal?

 

[Ruiner46]

To answer the original question, you can control boost with a potentiometer or a smoothboost module that accepts a PWM input. You'd have to do something custom/special to add that control with the factory ecu. Probably possible with Pcmtec's custom OS but I'm not sure where you'd get the PWM output from the factory ecu. Keep in mind you can also add buttons to boost scramble or cut pretty easily. I planned to add a steering wheel button for a boost scramble. That way I can launch with low boost and after shifting to 2nd, hit the button for full boost

 

[Joshinator99]

I have a whippled 10R80 s550 in Australia. Are these smooth boost bypass kits tunable via the factory ecu for say boost by gear? Wengerd has remote tuned my car so I'd get him to do the follow up tunes with smooth boost if possible.

Yes as Ruiner says below. Would need a way for the ECU to output a PWM signal though…

devils advocate here…but maybe just buy a centrifugal instead, and not need all the accoutrements to make it act like one

Smoothboost works great on a centrifugal too FYI… ;)

Are you trying to tell us that the max boost of a centrifugal isn't controlled by the size of the pulley? Can you control boost by gear with a centrifugal?

Agreed, Smoothboost would let a centrifugal run “race” pulleys even in street use.

To answer the original question, you can control boost with a potentiometer or a smoothboost module that accepts a PWM input. You'd have to do something custom/special to add that control with the factory ecu. Probably possible with Pcmtec's custom OS but I'm not sure where you'd get the PWM output from the factory ecu. Keep in mind you can also add buttons to boost scramble or cut pretty easily. I planned to add a steering wheel button for a boost scramble. That way I can launch with low boost and after shifting to 2nd, hit the button for full boost

Yep

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