More 1/4 mile help please!
Record Breaker
Joined: May 2005
Posts: 1,023
Likes: 0
From:
RE: More 1/4 mile help please!
after all that, some things to try; Scootch yer seat up a couple of notches closer to the wheel but be comfortable, Scoot the pax seat full forward and tilt up, Lay the rear seatbacks forward, Take out floor mats/any junk, Adjust tire pressures 40+ rear, 22-20 front, HOLD the throttle STEADY at 1500, Let the clutch out quick as possible while feeding in the gas. Dont dump the clutch. Get gas to the floor as quick as possible. (Sounds rudimentary I know) Results should be something of a skitter from the front wheels but not a full blown smoking burnout. Also, have the clutch partially out to just before the engagement band when you start. I can wot shift the 1-2 and 3-4 but I gas off clutch shift the 2-3 IMO it's just too tricky to complete the 2-3 without a little more time and a throttle cut. I have way too many times thought it popped into 3rd when it did not and crunched, but maybe that's just me. You can shift a little early like at 5500 on the 1-2 but the rest should be done at 5800-6000. You could also take your spare tire out, but I ran a 13.86 with mine in and a 100% stock engine. That's up to you. In the old days of super stock, if the car came with a spare tire, you had to run with a spare tire. That's why I kept mine in. Just to be old school about it.
Record Breaker
Joined: Apr 2004
Posts: 1,204
Likes: 0
From: ewa beach, hawaii
RE: More 1/4 mile help please!
you mean the land of p**s water.
ORIGINAL: posthondaremoval
As pressurecooker mentioned, I think it sounds like your ecu is pulling timing, as well. It has been found that the engine just doesn't like 91 octane.
To see : Try some gasoline additive like lucas octane booster to stop it pinging. Do a full tank of additive enriched gas. After filling up, get it somewhere you can park it and unplug the negative on the battery for around a half hour, so the ecu reserts. After that give it some gradual learning for a few miles, and start doing a couple full 3rd gear pulls on the highway. Once you have done all this, you will be able to try your 1/4 mile run and see if timing is the issue, here. I feel bad for you cali guys in the land of 91 octane super.
ORIGINAL: Andy4.7
91 Octane, Shell. 91 is best we have in CA. It's pretty cool out, was probably mid 50s low 60s tops. Temp gauge at normal temp. I did all the runs pretty much back to back. A couple minutes of light driving inbetween.
One other note, I first went with the airbox lid off... I took it off last weekend and loved the sound so I been driving with it off. After a few runs I thought maybe it was having a negative affect, so I went home put it back on and did a few more runs. Ran pretty much the same with it on and off.
Heres the charts from gtech.
Lid off
[IMG]local://upfiles/19457/A95ACC95F37A4DA8B6A1B84EC1E9C5AA.jpg[/IMG]
Lid On
[IMG]local://upfiles/19457/A5293DDCF04D4829A14DC169D87DA76D.jpg[/IMG]
ORIGINAL: Pressurecooker
Sounds like the computer was pulling back timing. What octane fuel are you using? How hot was it outside? How hot was the engine? Were you doing back to back runs without cooling?
Sounds like the computer was pulling back timing. What octane fuel are you using? How hot was it outside? How hot was the engine? Were you doing back to back runs without cooling?
One other note, I first went with the airbox lid off... I took it off last weekend and loved the sound so I been driving with it off. After a few runs I thought maybe it was having a negative affect, so I went home put it back on and did a few more runs. Ran pretty much the same with it on and off.
Heres the charts from gtech.
Lid off
[IMG]local://upfiles/19457/A95ACC95F37A4DA8B6A1B84EC1E9C5AA.jpg[/IMG]
Lid On
[IMG]local://upfiles/19457/A5293DDCF04D4829A14DC169D87DA76D.jpg[/IMG]
To see : Try some gasoline additive like lucas octane booster to stop it pinging. Do a full tank of additive enriched gas. After filling up, get it somewhere you can park it and unplug the negative on the battery for around a half hour, so the ecu reserts. After that give it some gradual learning for a few miles, and start doing a couple full 3rd gear pulls on the highway. Once you have done all this, you will be able to try your 1/4 mile run and see if timing is the issue, here. I feel bad for you cali guys in the land of 91 octane super.
Thread Starter
|
Captain
Joined: Aug 2005
Posts: 561
Likes: 0
From:
RE: More 1/4 mile help please!
Well guys, tried the booster today, so far not much of a change in the times. I'll post the full times later, I'm going to try again after I burn off some more of the gas tonight. But basically, 2.4 60fts and 14.5@98 is consistantly what I'm getting.
I'm starting to wonder if it's just the launch... Assuming a gain of .2 for ever .1 in the 60, a 2.1 could mean a 13.9-14.1 I would think. So I guess the question now is, what are the 60fts for guys running around 14.0?
I'm starting to wonder if it's just the launch... Assuming a gain of .2 for ever .1 in the 60, a 2.1 could mean a 13.9-14.1 I would think. So I guess the question now is, what are the 60fts for guys running around 14.0?
Captain
Joined: Sep 2005
Posts: 504
Likes: 0
RE: More 1/4 mile help please!
I'd have to look back andy, but it seems that I had a 2.3 60' and run a 14.1 through the quarter. I think my trap speed was 99.xx. I remember that i didn't reach 100. I remember my 60' time being high, because if I had just lessened the 60, just a little, I would have been into the 13's. I'm guessing that your trap speed is a little low, but why, I dunno. Are you sure those gtech things are accurate? You really ought to take it to the track to see what it can really do. Also, I would try to make sure that I was doing my testing on the same road and same temp's, if I could. I wish I could give you some advice. The things that Pressure told you to do, I tried, and it helped me. I didn't take off any weight, and I forgot to lessen the air in my front tires, but the advice he gave is very good. Did you try the additive that PHR advised? If so, could you tell any difference?
Thread Starter
|
Captain
Joined: Aug 2005
Posts: 561
Likes: 0
From:
RE: More 1/4 mile help please!
Ya know, I'm starting to hope maybe the gtech isn't accurate. Though I can't imagine it being .3+ off I've always heard they're atleast within a tenth. But I guess never testing it at the track I can't know for sure. As I've said before, I've only been driving a manual for 3500 miles now so I probably don't compare to a pro but I'm good at this type of thing I believe and on these runs I'm hitting the shifts smooth and I really can't imagine it going much better - minus the launch.
Wednesday night drags are done for the year, but I think they might still have the test and tune on saturdays I'll have to check. $50 vs $15 but I'd really like to know where I stand for sure stock.
Wednesday night drags are done for the year, but I think they might still have the test and tune on saturdays I'll have to check. $50 vs $15 but I'd really like to know where I stand for sure stock.
Record Breaker
Joined: May 2005
Posts: 1,023
Likes: 0
From:
RE: More 1/4 mile help please!
Well, looking at some old time slips this is what I have; First I'll list the 60, then its corresponding qtr.
2.21@13.98, 2.31@14.16, 2.23@14.17, 2.23@14.09, 2.21@14.07, 2.12@14.88(missed 3rd), 2.15@14.00, 2.19@13.95, 2.17@13.86. So you can see the correlation between the 60 and the e.t., but note also my best 60 was my worst e.t. due to a botched shift.
A 2.1x 60 will almost guarantee a 13.9x qtr if all else is up to par.
2.21@13.98, 2.31@14.16, 2.23@14.17, 2.23@14.09, 2.21@14.07, 2.12@14.88(missed 3rd), 2.15@14.00, 2.19@13.95, 2.17@13.86. So you can see the correlation between the 60 and the e.t., but note also my best 60 was my worst e.t. due to a botched shift.
A 2.1x 60 will almost guarantee a 13.9x qtr if all else is up to par.
ORIGINAL: Andy4.7
Well guys, tried the booster today, so far not much of a change in the times. I'll post the full times later, I'm going to try again after I burn off some more of the gas tonight. But basically, 2.4 60fts and 14.5@98 is consistantly what I'm getting.
I'm starting to wonder if it's just the launch... Assuming a gain of .2 for ever .1 in the 60, a 2.1 could mean a 13.9-14.1 I would think. So I guess the question now is, what are the 60fts for guys running around 14.0?
Well guys, tried the booster today, so far not much of a change in the times. I'll post the full times later, I'm going to try again after I burn off some more of the gas tonight. But basically, 2.4 60fts and 14.5@98 is consistantly what I'm getting.
I'm starting to wonder if it's just the launch... Assuming a gain of .2 for ever .1 in the 60, a 2.1 could mean a 13.9-14.1 I would think. So I guess the question now is, what are the 60fts for guys running around 14.0?
Thread Starter
|
Captain
Joined: Aug 2005
Posts: 561
Likes: 0
From:
RE: More 1/4 mile help please!
Thanks for that. Looking at all the numbers I'm starting to think it's just comming down to driver error.
Later tonight I cut two 14.4@98s with a 2.3 and a 2.4 60ft. So again, assuming .1 in the 60ft is .2 in the 1/4 a 2.1 60ft could reasonably drop me to around 13.8-14.0
I'm going to quit worrying about it and just get more practice driving and working on the 60ft and see what happens.
Later tonight I cut two 14.4@98s with a 2.3 and a 2.4 60ft. So again, assuming .1 in the 60ft is .2 in the 1/4 a 2.1 60ft could reasonably drop me to around 13.8-14.0
I'm going to quit worrying about it and just get more practice driving and working on the 60ft and see what happens.
Legend
Joined: Jul 2003
Posts: 9,543
Likes: 2
From: United States
RE: More 1/4 mile help please!
The launch and the weather make all the difference in the world with these cars. Everyone knows what a pain the SRT-4 is to launch. I've seen a car (stock '02 WRX) go from a 15.8 in the 1/4 mile (as did every stock WRX from new to used at that track) to a 14.7 in the 1/4 mile (on a hot run immediately after a 2 hour drive) just by going from one track to another, so weather can make a huge difference on a turbo car.
Record Breaker
Joined: Jun 2004
Posts: 1,740
Likes: 0
From: Phila, PA
RE: More 1/4 mile help please!
ORIGINAL: Pressurecooker
after all that, some things to try; Scootch yer seat up a couple of notches closer to the wheel but be comfortable, Scoot the pax seat full forward and tilt up, Lay the rear seatbacks forward, Take out floor mats/any junk, Adjust tire pressures 40+ rear, 22-20 front, HOLD the throttle STEADY at 1500, Let the clutch out quick as possible while feeding in the gas. Dont dump the clutch. Get gas to the floor as quick as possible. (Sounds rudimentary I know) Results should be something of a skitter from the front wheels but not a full blown smoking burnout. Also, have the clutch partially out to just before the engagement band when you start. I can wot shift the 1-2 and 3-4 but I gas off clutch shift the 2-3 IMO it's just too tricky to complete the 2-3 without a little more time and a throttle cut. I have way too many times thought it popped into 3rd when it did not and crunched, but maybe that's just me. You can shift a little early like at 5500 on the 1-2 but the rest should be done at 5800-6000. You could also take your spare tire out, but I ran a 13.86 with mine in and a 100% stock engine. That's up to you. In the old days of super stock, if the car came with a spare tire, you had to run with a spare tire. That's why I kept mine in. Just to be old school about it.
after all that, some things to try; Scootch yer seat up a couple of notches closer to the wheel but be comfortable, Scoot the pax seat full forward and tilt up, Lay the rear seatbacks forward, Take out floor mats/any junk, Adjust tire pressures 40+ rear, 22-20 front, HOLD the throttle STEADY at 1500, Let the clutch out quick as possible while feeding in the gas. Dont dump the clutch. Get gas to the floor as quick as possible. (Sounds rudimentary I know) Results should be something of a skitter from the front wheels but not a full blown smoking burnout. Also, have the clutch partially out to just before the engagement band when you start. I can wot shift the 1-2 and 3-4 but I gas off clutch shift the 2-3 IMO it's just too tricky to complete the 2-3 without a little more time and a throttle cut. I have way too many times thought it popped into 3rd when it did not and crunched, but maybe that's just me. You can shift a little early like at 5500 on the 1-2 but the rest should be done at 5800-6000. You could also take your spare tire out, but I ran a 13.86 with mine in and a 100% stock engine. That's up to you. In the old days of super stock, if the car came with a spare tire, you had to run with a spare tire. That's why I kept mine in. Just to be old school about it.
Very well posted.
I run the same way, but I personally hold the engine at 1800-2000rpm's. either way - very good advice in there.