Sprint Booster review for 370z 7 speed AT

Zeto · 10-20-2010, 09:21 AM

Quote:

Originally Posted by NXTAZEE

Ok, so the SB increases throttle input percentage. So then if you have it in race mode you will attain full throttle at about 75% of throttle travel. Now, if you mash the throttle down in this mode will it not reach WOT in less time? Assuming we are pressing the throttle down equally as quick in each case, it would take longer to achieve WOT in the stock setting. If this stands to reason then improved throttle response would be the result. Would it not?

This is it exactly!! I bought the sprintbooster with doubts but let me tell you, I am now a believer.

ChrisSlicks · 10-20-2010, 09:24 AM

Quote:

Originally Posted by NXTAZEE

Ok, so the SB increases throttle input percentage. So then if you have it in race mode you will attain full throttle at about 75% of throttle travel. Now, if you mash the throttle down in this mode will it not reach WOT in less time? Assuming we are pressing the throttle down equally as quick in each case, it would take longer to achieve WOT in the stock setting. If this stands to reason then improved throttle response would be the result. Would it not?

No. I can get my foot to the floor in 1/10th of a second (100ms), most of that time is in initiating the movement. At best you are possibly saving 0.01 seconds - not perceptible. I don't doubt that it makes the car feel more responsive in other partial throttle situations, but that is mostly perception - i.e. you got more go from a smaller movement. The problem that people like Digi are talking about isn't going to be fixed by a pedal, it is the ECU programming.

Westwood · 10-20-2010, 01:53 PM

Quote:

Originally Posted by Zeto

This is it exactly!! I bought the sprintbooster with doubts but let me tell you, I am now a believer.

its the way it should be.

Zsteve · 10-20-2010, 04:01 PM

As one of the graphs displayed showed, this is all about voltage. At WOT there is about 5 volts, half 2.5 volts etc. So what Im thinking is the booster just adds more voltage sooner so it is imulating WOT at half throttle. I think someone said something about messing with resisters which will change voltages. Now if it is also doing some other change I dont know and if it is Im not sure what it could be at the pedal. I would be curious to drive my car then one with the booster in to see what it does.

DIGItonium · 10-21-2010, 07:08 AM

Quote:

Originally Posted by Zsteve

As one of the graphs displayed showed, this is all about voltage. At WOT there is about 5 volts, half 2.5 volts etc. So what Im thinking is the booster just adds more voltage sooner so it is imulating WOT at half throttle.

Pretty much. I'm assuming the pedal has a potentiometer whose reference voltages vary from 0-5V. The response should be linear with pedal travel. SB pretty much alters this "linear" voltage curve with one that is adjusted with a quicker curve. The ECU is programmed with its own throttle control map that takes these reference voltage levels and apply throttle control according to numerous factors (emission, engine, environmental, safety, etc.).

With cars being so "smart" nowadays with practically full computer controls, the ECU tries to operate the engine in a manner that is the most efficient.

It's all within the programming of the system. I'm pretty sure a 3.7L engine with high compression is capable of producing more low end torque, but at the expense of other factors. It's pretty unfortunate, but I'm pretty sure that's how we get the extra 1 MPG despite having more power.

So depending on these factors, our sense of 80% pedal travel and expecting 80% throttle won't be the same all the time.

elmz · 10-21-2010, 10:52 AM

I'm still waiting for mine to arrive and I'll do a comparison video. I think the main issue here is people keep talking about how it "just" amplifies throttle response by X amount percent. But what others are trying to say is, it shaves off the actual lag it takes for the engine to start reving from the second you pound on the throttle, AS WELL AS amplify throttle response. The fact is, when you are rolling at a very slow pace or even at idle, and floor it, the engine doesn't even begin to really rev until 2-3 seconds later, and that is with the throttle all the way down. It just doesn't wind up like it did in my 350Z, and anyone who previously owned one will know this.

I'm not sure if this has been posted before, and he maybe a member here, but he has a video displaying the lag. When I get mine, I'll do one with the SB installed so we can all "see" the difference. But if someone else who already has a SB installed wants to do it, it would save me the trouble

elmz · 10-21-2010, 10:54 AM

Hehe I forgot to link the video

http://www.youtube.com/watch?v=R6W_39sKb2s

VinZ · 10-21-2010, 12:07 PM

Ok, I ordered mine after reading the reveiws here and because I also hate the dreaded 1 sec delay when u hit the gas. I got it with the discounted group buy from the link posted in this thread

. I installed it yesterday and it is everything that people are saying. The car just seems way faster and practially getz rid of the delay. It's definatly not as pronouced as before. I'd say it is worth the discounted price that I paid and makes the car more enjoyable to drive. It feels like it's always ready go, where before it felt a little lazy. Overall I'm happy with it.

ChrisSlicks · 10-21-2010, 01:01 PM

Quote:

Originally Posted by elmz

I think the main issue here is people keep talking about how it "just" amplifies throttle response by X amount percent. But what others are trying to say is, it shaves off the actual lag it takes for the engine to start reving from the second you pound on the throttle, AS WELL AS amplify throttle response. The fact is, when you are rolling at a very slow pace or even at idle, and floor it, the engine doesn't even begin to really rev until 2-3 seconds later, and that is with the throttle all the way down. It just doesn't wind up like it did in my 350Z, and anyone who previously owned one will know this.

I'm sorry, it cannot fix this. It does not alter the ECU in any way, hence correcting any ECU lag (whatever the reason) is impossible. It only amplifies throttle response - read their information, it is very clear in this regard.

elmz · 10-21-2010, 02:25 PM

Quote:

Originally Posted by ChrisSlicks

I'm sorry, it cannot fix this. It does not alter the ECU in any way, hence correcting any ECU lag (whatever the reason) is impossible. It only amplifies throttle response - read their information, it is very clear in this regard.

Sounds good man, that's why you're not going to order it. But I am.

ChrisSlicks · 10-21-2010, 02:29 PM

Quote:

Originally Posted by elmz

Sounds good man, that's why you're not going to order it. But I am.

Knock yourself out. Just saying that the money can be better spent on a tune, where they actually can address some of these issues.

Zsteve · 10-21-2010, 02:33 PM

I guess the real test would be on the 1/4 track, doing somer before runs and afters runs and see if it actually helps. Im sure it may improve the fun factor, and trust me that is a big thing, and it might be worth the intro price just for that alone. But for me to believe I would have to drive my car which has the CBE and Cobb tune and then the SB car. Now the delay everyone is talking about I only feel if Im in regular drive and low rpms and stomp on the gas, then it takes a sec to kick in. But if I know I want to zoom zoom, I put it in paddle mode and drop a gear or two to get the rpms up (just like a stick shift would have to do) and when I step on it then the car just goes. Even a stick will be slugish if its not in the right gear and rpms.

wishihadnav · 10-21-2010, 02:42 PM

you can get uprev tuned for around $500...why buy this?..just spend a little more for the tune and your set.

DIGItonium · 10-21-2010, 03:53 PM

Quote:

Originally Posted by Zsteve

Now the delay everyone is talking about I only feel if Im in regular drive and low rpms and stomp on the gas, then it takes a sec to kick in. But if I know I want to zoom zoom, I put it in paddle mode and drop a gear or two to get the rpms up (just like a stick shift would have to do) and when I step on it then the car just goes. Even a stick will be slugish if its not in the right gear and rpms.

Yea, but my problem is that I can literally floor it in 1st and 2nd and it doesn't pull hard at all. You can view my YouTube video in the Gas Pedal Delay thread. I recorded some clips showing how I can break loose my tires on a roll in 1st when "cool," record the speed the car revs up in 1st and 2nd, and then show it again when things are "hot." The video will show you that on a roll in 1st and 2nd, the car revs up slow as if throttle isn't even opening up. That's why I don't think SB will help my situation.

I'm perfectly fine with the throttle response of this car immediately once the car warms up after start up. Then after driving for awhile the throttle response becomes sluggish to the point I find myself trying to give it more gas to get it to go anywhere. It's bad when temps are hot out there.

Sorry for going OT in this thread, but just to make things clear about throttle delay versus not getting power when applying 50-80% throttle on a roll. I'm going for another test drive with the tech this afternoon since it's warmer.

[EDIT] Drats... had to reschedule. Hopefully it doesn't get any colder.

Zsteve · 10-21-2010, 07:04 PM

Quote:

Originally Posted by DIGItonium

Yea, but my problem is that I can literally floor it in 1st and 2nd and it doesn't pull hard at all. You can view my YouTube video in the Gas Pedal Delay thread. I recorded some clips showing how I can break loose my tires on a roll in 1st when "cool," record the speed the car revs up in 1st and 2nd, and then show it again when things are "hot." The video will show you that on a roll in 1st and 2nd, the car revs up slow as if throttle isn't even opening up. That's why I don't think SB will help my situation.

I'm perfectly fine with the throttle response of this car immediately once the car warms up after start up. Then after driving for awhile the throttle response becomes sluggish to the point I find myself trying to give it more gas to get it to go anywhere. It's bad when temps are hot out there.

Sorry for going OT in this thread, but just to make things clear about throttle delay versus not getting power when applying 50-80% throttle on a roll. I'm going for another test drive with the tech this afternoon since it's warmer.

[EDIT] Drats... had to reschedule. Hopefully it doesn't get any colder.

could what you are describing, (after things get hot) be heat loss? I dont know if that would affect throttle response or not but I do know it robs you of hp and the ECU changes settings to try and compensate.

10-20-2010, 04:01 PM	#64 (permalink)
Zsteve A True Z Fanatic Join Date: Sep 2009 Location: TX Posts: 3,298 Drives: the 2 balled club Rep Power: 21	As one of the graphs displayed showed, this is all about voltage. At WOT there is about 5 volts, half 2.5 volts etc. So what Im thinking is the booster just adds more voltage sooner so it is imulating WOT at half throttle. I think someone said something about messing with resisters which will change voltages. Now if it is also doing some other change I dont know and if it is Im not sure what it could be at the pedal. I would be curious to drive my car then one with the booster in to see what it does. __________________ 2010 LS3 C6 Silver coupe corvette

10-21-2010, 10:52 AM	#66 (permalink)
elmz Track Member Join Date: Feb 2009 Location: San Diego, CA Posts: 674 Drives: 2014 Porsche Boxster Rep Power: 17	I'm still waiting for mine to arrive and I'll do a comparison video. I think the main issue here is people keep talking about how it "just" amplifies throttle response by X amount percent. But what others are trying to say is, it shaves off the actual lag it takes for the engine to start reving from the second you pound on the throttle, AS WELL AS amplify throttle response. The fact is, when you are rolling at a very slow pace or even at idle, and floor it, the engine doesn't even begin to really rev until 2-3 seconds later, and that is with the throttle all the way down. It just doesn't wind up like it did in my 350Z, and anyone who previously owned one will know this. I'm not sure if this has been posted before, and he maybe a member here, but he has a video displaying the lag. When I get mine, I'll do one with the SB installed so we can all "see" the difference. But if someone else who already has a SB installed wants to do it, it would save me the trouble Last edited by elmz; 10-21-2010 at 10:58 AM.

10-21-2010, 02:33 PM	#72 (permalink)
Zsteve A True Z Fanatic Join Date: Sep 2009 Location: TX Posts: 3,298 Drives: the 2 balled club Rep Power: 21	I guess the real test would be on the 1/4 track, doing somer before runs and afters runs and see if it actually helps. Im sure it may improve the fun factor, and trust me that is a big thing, and it might be worth the intro price just for that alone. But for me to believe I would have to drive my car which has the CBE and Cobb tune and then the SB car. Now the delay everyone is talking about I only feel if Im in regular drive and low rpms and stomp on the gas, then it takes a sec to kick in. But if I know I want to zoom zoom, I put it in paddle mode and drop a gear or two to get the rpms up (just like a stick shift would have to do) and when I step on it then the car just goes. Even a stick will be slugish if its not in the right gear and rpms. __________________ 2010 LS3 C6 Silver coupe corvette

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10-21-2010, 10:54 AM	#67 (permalink)
elmz Track Member Join Date: Feb 2009 Location: San Diego, CA Posts: 674 Drives: 2014 Porsche Boxster Rep Power: 17	Hehe I forgot to link the video http://www.youtube.com/watch?v=R6W_39sKb2s

10-21-2010, 12:07 PM	#68 (permalink)
VinZ Base Member Join Date: Jun 2009 Location: Florida Posts: 47 Drives: 2009 370Z PG Sport Rep Power: 15	Ok, I ordered mine after reading the reveiws here and because I also hate the dreaded 1 sec delay when u hit the gas. I got it with the discounted group buy from the link posted in this thread . I installed it yesterday and it is everything that people are saying. The car just seems way faster and practially getz rid of the delay. It's definatly not as pronouced as before. I'd say it is worth the discounted price that I paid and makes the car more enjoyable to drive. It feels like it's always ready go, where before it felt a little lazy. Overall I'm happy with it.

10-21-2010, 02:42 PM	#73 (permalink)
wishihadnav A True Z Fanatic Join Date: Nov 2009 Location: 90090 Posts: 1,851 Drives: Force Fed Nismo Rep Power: 183	you can get uprev tuned for around $500...why buy this?..just spend a little more for the tune and your set.