IHADAV8.com - Turbo Buick Tech, and Nonsense
Tech Area => General Buick Tech => Topic started by: Shimy87 on July 16 2021, 04:05:58 PM
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Track day Sunday!!! I'm attaching a couple logs from some test passes on the street. Probably a touch rich but what do ya think. some knock on the one but dont know if I should be concerned?? the one run that shows 9 lbs boost was set at a 2 bar map sensor so shows low boost pressure, was actually 23-24 lbs. run 3 I lowered 1st gear fueling to 124.
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Okay, I only looked at run three.
It is still too rich in low gear. I would aim for less than .800v. I also would add some timing to first gear. that may help get the O2s more inline. You might try that first and then adjust the fueling after seeing what effect that had.
That does not look like detonation to me...at that boost, it should ramp up if real.
I would try for 25 psi of boost. That will, of course, lean it down.
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Is there an Apple program that will open & display those data logs?
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No. You can download Powerlogger software from the Turbotweak site. Windows only.
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Thanks Steve, never messed with timing before. What would you suggest for first gear timing?
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Try plus 2 degs in low as a test
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To put it in order.
Raise the boost to 25. Add two degrees of timing to Low gear. Adjust the fuel to get the O2s below 800 thru out the run.
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Thanks Steve, I give it a go a let ya know what it ran Sunday!!
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👍👍
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Assuming ''race'' gas or alky.
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alky
I cant get pic of time slip to load, heres the numbers
60 ' 1.677
330 4.828
1/8 7.564
mph 89.5
1000 9.951
1/4 11.984
mph 110.31
log of that run attached, best of the day, it was humid and 85 degrees. Nothing amazing but finally hit the 11's so I'm happy.....Than ks Steve!!!
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Good start! I will look at the in log after while 👍
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Looking at the slip, I see it only gained about 20 mph in the last half. I would have expected more like 24 mph. It was picking up rpm so I am guessing it was losing it in the converter. I think I would consult the guy that built the converter and ask him if you should lock it up about 80 mph?
It is still way rich in first and second and I noticed that you did not add any timing to first...at least on this run. My experience is that any time the o2s are over 800, the car is slowing down. I am guessing there is quite a bit more to get out of first and second. I was hoping that more timing would bring it alive and burn more fuel thus bringing the o2s down.
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Didn't get many runs, the waves of knock at the end of run had me scared to do much more...was probably false? I expected better mph also...I will contact the converter guy.
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That was not actual detonation. Good start to the year👍👍
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Talke to Husek and he said not to lock converter with a switch. I have to check my logs at home but I think the car was shifting and going thru the lights at about 5200 rpm...shouldnt it be closer to 5400 on the shifts and at the line?
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Looking at Sunday's log, it shifted to second at 5280, to third at 5200, and you let off at 5066 when you hit the line.
Another couple of hundred rpm would not have hurt. I was always too slow to manually shift out of first. Floated the valves a few times.
I am not sure what effect will happen if you get it leaned down other than faster acceleration in first and second. It will probably still try to shift at the same rpm but you may gain some rpm in third at the line.
I don't recall what cam you have in the car if you changed it. The stock cam was pretty much over with by 5200-5400 rpm as I recall. You could trim the governor a tiny amount and bump it up a little.
You might calculate the speed it should have been going when you crossed the line and compare that to what it was actually indicating to see how much slip it was incurring and ask the guy if that is what he expects.
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its got a 206/206 cam. I'll have to figure out the slip thing :)
The calculators I find say about 2% slip???
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Okay, for the 206 cam, I am guessing you should be shifting about 5600 rpm.
2% does not sound anywhere close to being correct. The powerlogger mph needs to be corrected for tire size. It is reporting what the speed would be if it was a 26" tire and I think you have a taller tire. I don't recall what tire you are running but I would guess the actual speed is closer to 8% faster than being reported on PL
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2% is probably wrong :) I used the 110 MPH on the time slip, 5066 at the line, 27.8 tire height, stock 3.42 rear and 4th gear is 67:1 ( I think)
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You were in third gear I think at the line so you should use 1.0 as the gear ratio.
Anyway, kicking the shift points up should make it quicker, I think
I suspect it will still be accelerating at 5700 rpm for that matter.
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RPM Calculator
Gear Ratio :
3.42
Trans Gear:
1.00
Tire Diameter:
27.8
Inches
MPH:
111
MPH
Converter Slip:
9
%
Input DATA Please
Your RPM is 5,003.09 RPM
according to wallace
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If you use 0.67 for trans ratio it's 3400 rpm
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So, with 9%, we know the converter is doing its job.
It appears to me that we have to get further up on the cam in first and second so the car can run on up in third before the line.
So as said previously, get the timing up in low, see how that affects the fueling. If necessary, pull more fuel out of first so it will rev faster, shift at 5600 or 5700 from first to second and second to third. Hope that allows to cross the line at 5400 or better.
I think 26 or 27 psi should not be a problem with boost either. but first, I would work to see how the higher shift points work. They might actually drop the boost??
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Btw, did you install the new ic?
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Not sure if your 206/206 cam is flat tappet or roller but that grind's power curve ends around 48000/5000rpm's. The roller may be 5200 rpm's.
Check your cam card or look up the brand and model #. After the power curve the hp level drops pretty fast so make all your tweeks before you get to that point.
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Yes. New IC
Flat tappet cam
After a long talk with Husek, the converter guy, he said the same thing. get some timing in first to get it to rev, he also suggested 26-27 lbs on boost. Said to really watch the fueling when messing with timing
I'm at a weird crossroads with the car. I love the racing/tuning stuff. I also love the car and not being boastful but its like new inside and the paint/body are perfect also. I'm the OCD car guy that is constantly polishing and cleaning..... Racing it is nerve racking but my goal was an 11 second car. I know thats not that impressive but that was my original goal and I have made it....barley but its there. In my head, I know I'm never getting in the 10's, so whats the point of pushing the car just to get to mid, maybe low 11's?? Is the risk of tearing up the car for a few more tenths worth it?
Dont know what I'm going to do, just talking to you guys for some feedback. I love the racing and I have a 2011 Camero thats not that fast but also fun to race and I have no "concerns" when I run that one.
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looks like your numbers are pretty good. I wouldn't worry about getting higher rpm's with that cam. Get your 60ft time in the 1.5's and add a little more boost and timing as Steve mentioned and you should hit 11.40's
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here is what TA says about their 206 cam.
VALVE LIFT
- STOCK 1.55 RATIO:
IN: .434”
EXH: .434” - TA ROLLERS 1.60 RATIO:
IN: .440”
EXH: .440”
DURATION
- AT .050
IN: 206
EXH: 206 - ADVERTISED
IN: 260
EXH: 260
- LOBE CENTER: 112
- POWER RANGE: 1500-5500
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You have done a good job if that’s your first time for you GN to go to the track.
What turbo is on it? I’m green with envy with your 60 foot time and it being rich.
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Been to the track a couple times a year for the last 6 years. When I first started going the car was in the 14's. If I make it to the track again this year plan on adjusting low gear timing, and manually shifting from 2 to 3.