1st pass (in the mark)
- Thread starter stock97lsc
- Start date
changing the fuel filter definatley wouldn't hurt.....
you will have to keep "that change" in mind when comparing/evaluating your ET's.
Since the Filter is "st00pid" easy to change..
I would go to the track and make two passes, to get a good baseline.
Then swap the fuel filter and go make some more passes.
...then compare notes.
That'll tell you IF the filter was "holding you back".
you will have to keep "that change" in mind when comparing/evaluating your ET's.
Since the Filter is "st00pid" easy to change..
I would go to the track and make two passes, to get a good baseline.
Then swap the fuel filter and go make some more passes.
...then compare notes.
That'll tell you IF the filter was "holding you back".
jbird97
Registered
I went 14.7 with a 2.1 60' in my 98 LSC. Only thing I had was 17" Cobra R's with 255/40/r17 BFG KDW2's all around. I know the tires helped the 60' but because they are a smaller diameter it made me hit the rev limiter in 2nd towards the end of the track. On that run I even lifted at around 5k rpm in 2nd hoping that with the hesitation maybe the car would shift instead of bounce off the limiter. It had been hitting the limiter a little ways before the line, so I was thinking shifting might actually be faster. I know the tires helped, but did they really help that much? It was a 14.7001 run, so not 14.6 but close enough that it aggrivated me a lil bit lol.
jbird97
Registered
I was told it was stock, I doubt it has gears as I know its an open diff, and I still finish the 1/4 in second.
I did take out the spare tire, and some other tools and stuff that was in my trunk, and turned off air ride, but yea... thats it. I know that everything else I can see is stock, maybe theres some internal work but I doubt that, as it doesn't seem to cam at all and who would do internals without touching anything else. I guess maybe it could have a higher stall converter, I could check that, what is it, parking brake on, foot on brake and gas till it stalls out the car in drive? And that rpm that it dies at is the stall speed? I forgot if thats how its done, I could check that Thursday, I have school all day tomorrow.
I did take out the spare tire, and some other tools and stuff that was in my trunk, and turned off air ride, but yea... thats it. I know that everything else I can see is stock, maybe theres some internal work but I doubt that, as it doesn't seem to cam at all and who would do internals without touching anything else. I guess maybe it could have a higher stall converter, I could check that, what is it, parking brake on, foot on brake and gas till it stalls out the car in drive? And that rpm that it dies at is the stall speed? I forgot if thats how its done, I could check that Thursday, I have school all day tomorrow.
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Something doesn't add up here... I have NEVER seen a stock geared Mark VIII go 14.7@91.X let along with a 2.1 60ft. They were always at 95/96/97 and especially with the larger heavier wheels.
It certainly sounds like either gears... or converter were changed.... but you did mention that you finish in 2nd hmm... since most LSCs finish in 3rd ...
Do you have the timeslip I want to compare your 1000' 1/8 mile etc with mine, this is very interesting.
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a 2.10 60 compared to a 2.25 60' would be a substantial hit on the ET.
Usually .1 in the 60' winds up being .15 on the big end.
So a .15 improvement in the 60' could easily be .3
Take a 15 second 2nd gen and have a 2.10 60 rather than the 2.2-2.3 60 and it could easily be 14.7 run.
I agree the MPH seems low
Usually .1 in the 60' winds up being .15 on the big end.
So a .15 improvement in the 60' could easily be .3
Take a 15 second 2nd gen and have a 2.10 60 rather than the 2.2-2.3 60 and it could easily be 14.7 run.
I agree the MPH seems low
jbird97
Registered
It wasn't a flat 2.1 60'. The mph is low because it hit the rev limiter and bounced off of it untill I let off, it actually felt like I had hit the brakes you could feel the car "lunge forward". I think it started out as a quick run, just at the end ran into the limiter and thats why the mph is so low.
I'm not at home so all I have for now is this online slip. It does round the times very slightly, i.e. I ran a 14.7001 not 14.7. If you want the actual slip I can scan it later when I get home, I'd take a pic, but I lost and the yellow paper makes the times hard to see in pictures.
http://myslips.com/viewtimeslip.php?id=745
Does anyone know how to check the stall speed? I don't think it has a tune either, what would be some ways to check that?
I'm not at home so all I have for now is this online slip. It does round the times very slightly, i.e. I ran a 14.7001 not 14.7. If you want the actual slip I can scan it later when I get home, I'd take a pic, but I lost and the yellow paper makes the times hard to see in pictures.
http://myslips.com/viewtimeslip.php?id=745
Does anyone know how to check the stall speed? I don't think it has a tune either, what would be some ways to check that?
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46callaway
Registered
To check the stall speed, put your foot on the brake and bring up the rpms, once the tires start to spin and burn out that point is where your stall is.
stock97lsc
Registered
mine finished in 2nd gear at 6500 rpms. a shorter stickier, tire = a lil higher gear ratio and better 60'. Almost 2 inches shorter would be like having at least 3.55's in the car.
jbird97
Registered
Well somebody's car has to be the fastest, right? Maybe yours is one of those one in a thousand cars.
WOOT
Well the car will be up on jackstands until weather settles down. I read in my automotive book today to: apply parking brake, foot break, put in low, and accelerate. When the speed stops climbing (on speedometer if I read right) then that rpm that that happens at is the stall speed. I'll try that tomorrow.
As far as it finishing in 2nd, it did that with stock wheels and tires too, just with those I didn't hit the limiter.
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How exactly does a stock engine rev beyond 6000? Computer prompts shifts at 5800 or so.
Because at WOT, the shift takes longer than 200 RPMs to complete.
The PCM "commands" the shift at a particular RPM, but the car doesnt "deliver" that shift at that RPM.
It takes time for the fluid to "push" the accumulator and to filll the "oncoming clutch".
All this happens quickly, but it doesnt happen with a 200RPM window.
For instance...
on my 373 car, my commanded shift is at 6K but the shift doesnt occur until almost 7K.
Almost 1K rpms between "commanded shift" and "delivered shift" on the 1-2.
the 2-3 doesnt take "that long" because the engine isn't accelerating at 1K per second.
You may be on to something there....
A stock PCM with no raised rev limit would indeed bounce off, or tickle the rev limiter during the shift.
Might just "lay down" a little as the shift comes up... hard to say.
stock shift point is 5800 cant remember what the stock revlimit is.. because it's been "so long and so many miles" since I drove with a "stock limiter".
A stock PCM with no raised rev limit would indeed bounce off, or tickle the rev limiter during the shift.
Might just "lay down" a little as the shift comes up... hard to say.
stock shift point is 5800 cant remember what the stock revlimit is.. because it's been "so long and so many miles" since I drove with a "stock limiter".