Clutch Slipping after 16G install

[ChvyKc]

FYI.. I tried reving the engine btw 5-6K to produce boost but saw maybe 1psi which dropped to -10 as soon as the RPMs dropped again.

I did datalog a race I ran a few weeks back and saw that after ~2secs of Studderbox set at 5K I built ~4.5psi of boost with my 50-trim. May have gotten a bit more had I more time to build boost, but in a race, such things are not always possible

You must be logged in to view this image or video.

That is the reason that I want to go with a stutterbox, it takes me longer to build 5 pounds than a couple of seconds. I always have problems building any boost when I am at the track. I usually don't have enough time before the tree counts down. If I had a stutter box that would be taken care of.

I am still working on trying to get a vid of me launching the car like that. I don't know anybody that has a digital video camera and I wasn't planning on buying one until next year (hoping to get one for christmas)

1000 RPM revs are not long enough to produce boost while free reving. This is way to hard to explain, I will just have to get something together so I can show you.

 

[ChvyKc]

Just wanted to let everybody know that I got a digital video camera and my firewire card is on order. It should be here next week and I will post a vid hopefully next weekend.

 

[Quasimondo]

I don't think you have a 2600 in that car. No matter how much boost you're pushing at launch, you shouldn't be able to slip that clutch. It's hard enough trying to make that thing slip when you're not launching.

 

[ChvyKc]

I don't think you have a 2600 in that car. No matter how much boost you're pushing at launch, you shouldn't be able to slip that clutch. It's hard enough trying to make that thing slip when you're not launching.

Yeah, I have already taken care of that problem. I am not able to slip the clutch anymore. The car had been sitting for a couple of weeks because I wasn't able to do the turbo swap all at once, so that could have been a factor in it. I ran my buddy in his LS1 camaro with 315 drag radials on the back and I yanked him two cars off the line, took him till the top of third gear to catch back up with me. The turbo and MAS upgrade really made a huge difference.

 

[ChvyKc]

Alright, finally got a video up and going. Let me know if you guys have any problems viewing it. I threw a clip in there that my g/f did so ya'll will know exactly how she feels about my car (listen at the very beginning) .

I was only able to launch the car at 7 pounds, but you can see that I did build 10 at one point. Sorry that the video is so shaky, I had to do it with one hand while I was holding the steering wheel.

Launch at 7 Pounds

 

[DSM90AWD]

Thanks for going to all the trouble to post that up ...the damdest thing I've ever seen WTF.

Still curious as to where your boost gauge source is plumbed (i.e. pre/post Throttle Body or off the compressor outlet itself).

As mentioned previously, a better "Race" launch approach (devoid a studderbox) would be to rev to 5K and do a fast abusive clutch-slip while applying more power. With my 50-trim, launching like that gives near-instantaneous boost at launch. If you can hold the brake pedal and slip the clutch slightly (power brake), you'd be able to hold a constant (+) boost until launching too

 

[ChvyKc]

Thanks for going to all the trouble to post that up ...the damdest thing I've ever seen WTF.

Still curious as to where your boost gauge source is plumbed (i.e. pre/post Throttle Body or off the compressor outlet itself).

As mentioned previously, a better "Race" launch approach (devoid a studderbox) would be to rev to 5K and do a fast abusive clutch-slip while applying more power. With my 50-trim, launching like that gives near-instantaneous boost at launch. If you can hold the brake pedal and slip the clutch slightly (power brake), you'd be able to hold a constant (+) boost until launching too

No, it's post throttle body. I didn't think that it was possible to measure vacuum unless it was tapped after the throttle body. I will have to look at this afternoon when I get off work (I'm in the Titan right now) to see exactly where the guy that had it before me tapped it.

I have tried launching it like you are saying, which is actually more consitant than the way that I do it, but as long as I let go of the clutch when the gas pedal is pressed down with at least five pounds built, then the car just leaps off of the line.

I ran my buddy with an 02 Z28 the other day with 315 drag radials on the back and got him two car lengths off the line. It took him till the top of my third gear to catch back up with me (the cars is sick fast for what little he has done to it, no way that I could keep up with him from a roll)

 

[weith1111]

Thanks for the video, but I'm still leaning towards the gauge being done wrong. There is no way I could just get in my car and rev it and get above 5 psi like you did. Actually, there is no way I could get above ZERO. The jury is still out on this one.

 

[ChvyKc]

Thanks for the video, but I'm still leaning towards the gauge being done wrong. There is no way I could just get in my car and rev it and get above 5 psi like you did. Actually, there is no way I could get above ZERO. The jury is still out on this one.

Alright, I will see where it is tapped and get back with ya'll on that. I don't see why it matters, it has no problem reading vacuum and boost when I am moving, but I would like to get this resolved.

 

[ChvyKc]

Gauge is tapped off the intake manifold, looks like the guy tapped the same line that goes to the FPR. Is this not right??? I don't understand how you can really install a boost gauge wrong. It's just one vacuum line and that's it, the other wires on the gauge are just for the light. I have done it plenty of times before, if you would like for me to change it to the same place that you have yours tapped and make another video then that is fine.

 

[97Boost4u]

Thanks for the video, but I'm still leaning towards the gauge being done wrong. There is no way I could just get in my car and rev it and get above 5 psi like you did. Actually, there is no way I could get above ZERO. The jury is still out on this one.

ok listen poindexter, get out your magnifying glass and watch again. The video isnt gonna lie for him. apparently you arent doing it right. Give us a break and admit you were wrong, how hard is that?

 

[97Boost4u]

You guys must be doing something alot different then the rest of us to build boost with an MT with no studder box nevermind 1-2 psi like mine studdering at WOT you guys are at 10 psi leaving the line

what is it that you do to try to build boost off the line?

 

[weith1111]

ok listen poindexter, get out your magnifying glass and watch again. The video isnt gonna lie for him. apparently you arent doing it right. Give us a break and admit you were wrong, how hard is that?

Listen, fella who has to call names because you have no idea what's going on. Any experienced tuner would be EXTREMELY skeptical of this. A 5 second video doesn't mean sh#t. I could make a video of me doing 140 mph in my garage. I'm not calling the video phony, I'm just skeptical about a couple things:

Notice the boost gauge reads near -30 vacuum=not normal.
Notice you don't hear the BOV after a build of 10 psi. But do after the launch and let off of the throttle.

The revving and launch sound similar to a normal AWD launch. A 10psi launch would rip you a new asshole. All I'm saying is I can go rev my ass off in the parking lot and I will hit 0 psi, and there are a few fishy things about the video/setup on the car as mentioned above.

edit: inappropriate

 

[ChvyKc]

Listen, fella who has to call names because you have no idea what's going on. Any experienced tuner would be EXTREMELY skeptical of this. A 5 second video doesn't mean sh#t. I could make a video of me doing 140 mph in my garage. I'm not calling the video phony, I'm just skeptical about a couple things:

Notice the boost gauge reads near -30 vacuum=not normal.
Notice you don't hear the BOV after a build of 10 psi. But do after the launch and let off of the throttle.

The revving and launch sound similar to a normal AWD launch. A 10psi launch would rip you a new asshole. All I'm saying is I can go rev my ass off in the parking lot and I will hit 0 psi, and there are a few fishy things about the video/setup on the car as mentioned above.

Thanks for the neg feedback by the way.

The reason that you can't hear the BOV at idle is because I am only at 10 pounds. The camera just doesn't pick it up well. Now, the reason that you can hear it after I launch the car is because when I get ready to shift into second I am at 20-22 pounds. There is a huge difference in the way the BOV is going to sound at 10 pounds as apposed to 20 or 22, it's just commond sense.

Trust me, when I let the clutch go, it sets you in the seat hard. Do you have any suggestions that I can do to make you understand that I am not lying????

 

[weith1111]

Do you have any suggestions that I can do to make you understand that I am not lying????

I'm not saying you are lying, but if you can clear up the -30 vacuum, I'll trust that gauge a little more.

You may very well be doing this, and are on to something new. It's just years of precedents and hundreds of others would argue it's not possible. You aren't going to come up with something new and have everyone just swallow it right off the bat. Let's get some other people that can do it.

Hell I'll give it a few more tries. How you described it and how it looked on the video are different. Can you take another vid showing the RPM's? Or explain it better? You made it sound like it takes repeated revs from 5-7, 5-7, 5-7, 5-7 ok go. In the video it looks like the first time you rev it your gauge is showing over 5psi.

 

[DSM90AWD]

I'm not saying you are lying, but if you can clear up the -30 vacuum, I'll trust that gauge a little more.

I did not catch that on my first look. I'm al most certain your boost gauge (VDO = crap) is junk as you should not be getting -28Hg vaccume at idle/off boost unless your running a huge vaccume pump or the internal boost gauge's spring is fubared allowing it to catapult way past the true readings

 

[ChvyKc]

I did not catch that on my first look. I'm al most certain your boost gauge (VDO = crap) is junk as you should not be getting -28Hg vaccume at idle/off boost unless your running a huge vaccume pump or the internal boost gauge's spring is fubared allowing it to catapult way past the true readings

Ok, if you two are not pulling at least 20 on vacuum when reving down then you have something terribly wrong with your car. At idle, I don't pull 28, but when the car is revving down then I do. I'm not exactly sure what I do pull at idle, but I don't believe that it is above 20. It's the same thing as when you are up in the RPM range on the interstate in like third or fouth gear and you let the car rev down through the gear, you should pull about 28-30. This is just normal, I pulled the same amount of Vacuum on my 89 and 86 Starions with an Autometer gauge in it.

The boost gauge came with the car, as I thought that I had already stated, but maybe not. It is not my choice, but it has worked perfectly for me so far. I know that RRE use to recommend this gauge a little while back, which is why I haven't gotten rid of it. I'm not questioning the gauge though, that is just rediculous. It's a simply mechanical gauge that does exactly what it is suppose to all of the time. If the spring inside of it was messed up then it wouldn't read boost right either.

I do understand that nobody is going to want to swallow a new concept that easily, but this is not really new to me, which is why I am trying to get it across that I am able to do this. I didn't even start this thread to argue about whether or not this can be done, I just thought that it was kind of strange that nobody but Holt, me and the guys that I run around with are able to do it.

As far as the first rev that I make, it's not from 5-7, it's more like from 3-7 and two thousand rpm revs are not going to build boost, that is just not possible. They need to be longer than that. I guess that I am going to have to make another video. Maybe me and Holt can get together so he can help me make it (kind of hard to do with one hand)

 

[97Boost4u]

Listen, fella who has to call names because you have no idea what's going on. Any experienced tuner would be EXTREMELY skeptical of this. A 5 second video doesn't mean sh#t. I could make a video of me doing 140 mph in my garage. I'm not calling the video phony, I'm just skeptical about a couple things:

Notice the boost gauge reads near -30 vacuum=not normal.
Notice you don't hear the BOV after a build of 10 psi. But do after the launch and let off of the throttle.

The revving and launch sound similar to a normal AWD launch. A 10psi launch would rip you a new asshole. All I'm saying is I can go rev my ass off in the parking lot and I will hit 0 psi, and there are a few fishy things about the video/setup on the car as mentioned above.

edit: inappropriate

First of, it annoys the sh*t out of me when a point has been proven and somebody has to be big balled and say hey i still think its bs just to be a jerk, second i do know whats going on, ive watched him do it and ive done it myself in my car. Also when i had stock cams i idled at 18-20 vacuum and with my crower stage 2s i still idle at 11-12 vacuum

 

[ChvyKc]

First of, it annoys the sh*t out of me when a point has been proven and somebody has to be big balled and say hey i still think its bs just to be a jerk, second i do know whats going on, ive watched him do it and ive done it myself in my car. Also when i had stock cams i idled at 18-20 vacuum and with my crower stage 2s i still idle at 11-12 vacuum

I actually pull right at 20 at idle as well.

 

[97Boost4u]

dave its no use to try any more, theres too many experts(although still under 300whp,how that happen?) on the thread

 

[ChvyKc]

dave its no use to try any more, theres too many experts(although still under 300whp,how that happen?) on the thread

I agree, I'm done with it. Just not worth it. I'm obviously doing something right to make enough power to jump from the dig like I do. Haven't been pulled off the line yet by anything with street legal tires.

 

[DSM90AWD]

dave its no use to try any more, theres too many experts(although still under 300whp,how that happen?) on the thread

Actually I'm more around 365whp now on 93oct , but yes, that still does not make me an expert.

ChvyKc.. Nice that you got your clutch thing sorted out, and you will like the Studder Launch, NLTS features. I'm actually going to be testing new code to pull timing during "Studdering" to get more boost at launch. Gonna need some slicks as can spin my 225s pretty good already with 4psi

 

[ChvyKc]

Actually I'm more around 365whp now on 93oct , but yes, that still does not make me an expert.

ChvyKc.. Nice that you got your clutch thing sorted out, and you will like the Studder Launch, NLTS features. I'm actually going to be testing new code to pull timing during "Studdering" to get more boost at launch. Gonna need some slicks as can spin my 225s pretty good already with 4psi

Hell yeah, let me know how it goes. Glad to see you got a 4-bolt swapped in