Results of the LT4 78mm turbo 20psi :)
12-01-2008, 02:50 PM
#21
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Thanks Dr. Turbo!
If you have a spare moment take a look at the graph. the dip in the curve even trying several things only seemed to move a little bit. it got better with more timing but the end result is what you see there.
In my opinion I am reaching a point where the wastegate is being forced open. boost drops off there as well but then comes back up following the graph. My guess is after the gate gets pushed open and boost drops, exhaust pressure drops and the gate closes again and the turbo begins making more boost thus the boost curve and the power curve come back up.
the drop in boost is 18psi at the low point down from 20psi the set point. I am looking into the Eboost2 and hoping it will give me enough top port pressure programability on the gate to get through to redline on a straight boost setting! and extend my power band across that dip or even maybe give me another 100-200 RPM of useable power.
what is your take on that?
Chris
If you have a spare moment take a look at the graph. the dip in the curve even trying several things only seemed to move a little bit. it got better with more timing but the end result is what you see there.
In my opinion I am reaching a point where the wastegate is being forced open. boost drops off there as well but then comes back up following the graph. My guess is after the gate gets pushed open and boost drops, exhaust pressure drops and the gate closes again and the turbo begins making more boost thus the boost curve and the power curve come back up.
the drop in boost is 18psi at the low point down from 20psi the set point. I am looking into the Eboost2 and hoping it will give me enough top port pressure programability on the gate to get through to redline on a straight boost setting! and extend my power band across that dip or even maybe give me another 100-200 RPM of useable power.
what is your take on that?
Chris
12-01-2008, 03:52 PM
#23
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wow, great job. I have a very very similar set up going in my 96 impalla SS now that I have replaced it with a 5.3 awd van for the family. I already have everything and was hoping I could run 12.0's at around 120, but with results like that it ll be easy.
Thanks for the kick in the pants to get busty.
Thanks for the kick in the pants to get busty.
12-01-2008, 04:34 PM
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Chris
12-01-2008, 04:36 PM
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wow, great job. I have a very very similar set up going in my 96 impalla SS now that I have replaced it with a 5.3 awd van for the family. I already have everything and was hoping I could run 12.0's at around 120, but with results like that it ll be easy.
Thanks for the kick in the pants to get busty.
Thanks for the kick in the pants to get busty.
No problem man!!! I had a metallic green 95 and LOVED that car always wish we had kept it because it would have made one hell of a sleeper with a set of turbos on it and a built motor.. you will enjoy the sleeper effect it has for sure!!!
Chris
12-01-2008, 08:27 PM
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Sultan,
Thank a bunch! I hope to have some better numbers up very shortly and then I will try with some more turbo to get her on up to the 4 digit mark! then it will finally be time to put an automatic in it and some suspension and get her to the track.. if you can get these C4 corvettes to hook, they do well because of the weight and small frontal area!
Chris
Thank a bunch! I hope to have some better numbers up very shortly and then I will try with some more turbo to get her on up to the 4 digit mark! then it will finally be time to put an automatic in it and some suspension and get her to the track.. if you can get these C4 corvettes to hook, they do well because of the weight and small frontal area!
Chris
12-01-2008, 08:54 PM
#29
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Man if you don't mind I will take you up on that offer just for an evening to tune them in on the street and then for the subsequent days dyno session. the Eboost2 is on the way as of today as is the new MSD box, so with some luck maybe this weekend I will be able to strap it down again. this time I am going to run an open downpipe and try it with the filter off and try and add 2,3,4,5 pounds more boost.. I want to see what I can push this combination to powerwise.. gotta put the LTx motors on the scoreboard..lol
Chris
Chris
the eboost 2 shuts down , turns off, plays up if there it too much "noise"
use the msd noise filter to help the eboost
ash
12-01-2008, 09:00 PM
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Crashly, good to know! I run dfi Gen 7 so I have the dual synch distributor in the back have gotten rid of the factory coil and ignition control module and use the MSD 6a to fire the coil and add some juice to fire off the mixture at higher boost levels. any more info on what filter to use? or is it pretty easy to find?
My stock tach is driven off the MSD and you can see it in the videos it is all over the place bouncing around.. drives me nuts!
Chris
My stock tach is driven off the MSD and you can see it in the videos it is all over the place bouncing around.. drives me nuts!
Chris
12-01-2008, 11:47 PM
#31
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yeeh mate,
here is the link to noise filter.
http://www.msdignition.com/product.a...d+noise+filter
your tach,
where is it getting the signal?
coil or msd ?
ash
here is the link to noise filter.
http://www.msdignition.com/product.a...d+noise+filter
your tach,
where is it getting the signal?
coil or msd ?
ash
12-02-2008, 09:46 AM
#34
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Crashly, good to know! I run dfi Gen 7 so I have the dual synch distributor in the back have gotten rid of the factory coil and ignition control module and use the MSD 6a to fire the coil and add some juice to fire off the mixture at higher boost levels. any more info on what filter to use? or is it pretty easy to find?
My stock tach is driven off the MSD and you can see it in the videos it is all over the place bouncing around.. drives me nuts!
Chris
My stock tach is driven off the MSD and you can see it in the videos it is all over the place bouncing around.. drives me nuts!
Chris
How do you like the Dual Sync?? I have one for my Lt1 build, but have heard conflicting reports on it when searching for big power. Some have said its better to use a crank trigger rather than the dual sync for timing referance.
12-02-2008, 11:01 AM
#35
Launching!
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your tach,
where is it getting the signal?
coil or msd ?
where is it getting the signal?
coil or msd ?
currently I get it from the MSD 6a but wonder if the DFI might be able to supply the signal in a better form then the MSD box... have to look into it.
John Wigger is cool, he can build a DSM Are you on NABR? Im an old DSMer at heart, nice placement of the turbo, got any build pics?
Yeah Joh is a great guy, he and I spent countless hours putting that DSM together the result was a VERY nice setup, one of the nicest I have seen or heard about. But I think his project will be very similar,, he got inspired to put some TLC into it after my project was done. I look forward to heloping him get it back on the track!
How do you like the Dual Sync?? I have one for my Lt1 build, but have heard conflicting reports on it when searching for big power. Some have said its better to use a crank trigger rather than the dual sync for timing referance.
Chris
12-03-2008, 08:34 PM
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eh.... that's cool and all, but you'd be way cooler if you did it with an opti still in place.
great numbers... A+ #1
we have seen many eboost controllers do that on the dyno...does it dip like that on the spring?
we have seen many eboost controllers do that on the dyno...does it dip like that on the spring?
Chris
12-04-2008, 08:12 AM
#40
What are the springs set for for minimum ? I know you can't go too far up on the springs maybe double not sure so sometimes you need to go up on minimum to hit higher boost.
On my 97 talon had like 10 or something and could only go to 20psi. then put in 20psi minimum so could go to 30psi or something like that.
You can try a quick test carefully by disconnecting the gate vacuum lines so the gates don't open. And seeing what max boost will go to.I said carefully! and just as a test.
On my 97 talon had like 10 or something and could only go to 20psi. then put in 20psi minimum so could go to 30psi or something like that.
You can try a quick test carefully by disconnecting the gate vacuum lines so the gates don't open. And seeing what max boost will go to.I said carefully! and just as a test.