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View Full Version : can someone explain these 1/4 mile times???



Nate_V6
10-27-2008, 09:41 PM
so i was just looking at the database and the supercoupes are all over the map for 1/4 times and power. one guy ran 12.480 with a 2L twin screw with 244rwhp and 349rwtq while another guy runs 13.9 with 269rwhp and 339rwtq and then another guy runs 12.300 with 379rwhp and 403rwtq! its all over the place and i cant judge whered id be with a 300rwhp mpx in a 97 mustang auto with a J-mod and 3.08s (3200-3300lbs?). im going to use 3.08 due to someone said that with these cars the lower gear is much better because you stay in the power band longer? yet the 2L twin screw guy is using 4.10s which explains some of his good 1/4 time, but the guy with 12.300 is using 3.55s. im so lost with these numbers, is it the IRS? can someone explain possibly?

nickleman60
10-27-2008, 09:51 PM
The first you better worry about is traction. My friend, Roadhawg, has a '95 mustang with a MPX fed supercoupe motor putting 343RWHP/420TQ to the wheels and a j-modded 4r70w and 3.73's. He is having big time traction issues but he's working on solving it.

David Neibert
10-28-2008, 12:42 AM
so i was just looking at the database and the supercoupes are all over the map for 1/4 times and power. one guy ran 12.480 with a 2L twin screw with 244rwhp and 349rwtq while another guy runs 13.9 with 269rwhp and 339rwtq and then another guy runs 12.300 with 379rwhp and 403rwtq! its all over the place and i cant judge whered id be with a 300rwhp mpx in a 97 mustang auto with a J-mod and 3.08s (3200-3300lbs?). im going to use 3.08 due to someone said that with these cars the lower gear is much better because you stay in the power band longer? yet the 2L twin screw guy is using 4.10s which explains some of his good 1/4 time, but the guy with 12.300 is using 3.55s. im so lost with these numbers, is it the IRS? can someone explain possibly?


The list don't make any sense because they haven't been updated in a long time and the dyno rules are not the same as the timeslip rules. Dyno list doesn't allow ARs, turbos, nitrous, alky injection....Fastest SC rules do.

Best bet for figuring what mods make what power or times, is to look at the member page for mods, and look at the person's signature for dyno numbers and track times.

David

Nate_V6
10-28-2008, 01:36 AM
i did , thats where i got those numbers lol, but i guess the biggest problem would be your guys IRS im assuming.

83GT460
10-28-2008, 01:42 AM
i did , thats where i got those numbers lol, but i guess the biggest problem would be your guys IRS im assuming.

You need to read a little closer. The 12.48 you mention is my car and the time was run with my home ported 95 blower and stock IC with around 320 hp, the 2.0 AR is listed as future plans and not on the car yet.

Charles

Nate_V6
10-28-2008, 03:35 AM
you are completely correct sah! but it did said 244rwhp lol. so 320rwhp and you ran that time? now the times are making sense! and i noticed to the others that seemed not right were manuals so driver error. so from the looks of things with the lighter mustang and 3.08s with 300rwhp that should definetly put me into 12s and then maybe mid 12s with a shift kit.

rzimmerl
10-28-2008, 07:26 AM
I am making 285RWHP on a 100%, 110K mile stock block, and am able to push a full weight SC to 13.3 (or lower, to be determined this weekend). Figure the weight of the Mustang with 285RWHP and I'd be in the 12's no problem.

Roadhawg
10-28-2008, 07:47 AM
Figure the weight of the Mustang with 285RWHP and I'd be in the 12's no problem.

With traction

XR7 Dave
10-28-2008, 08:24 AM
With tractionI think that is a general assumption when speaking about any 1/4 mile time, particularly one in the 12's. A v6 powered Mustang will not have any worse traction problems than a V8 with a 150hp nitrous shot which a lot of people run very successfully in Mustangs.

Changing to 3.08 gears so that you "keep in your power band" is a silly notion as how to keep from spinning tires. Spend the money on some good tires instead.

XxSlowpokexX
10-28-2008, 08:32 AM
I generaly get less traction with a 3.08 as oppossed to a 4.10,,It does make sence..Really.

Also gearing in the manual SC transmissions are different thus why certain gears may be reccomended.

CMac89
10-28-2008, 10:54 AM
Traction and driver error will be the key factors in the randomness of people's ETs. Driver error is most common with stick cars.

Buy slicks and you won't have much traction problems at all. I definitely wouldn't sacrifice gearing for traction. What you think you gain, you lose somewhere else.

A cute, little, 300rwhp pony can run 11's.

David Neibert
10-28-2008, 03:15 PM
i did , thats where i got those numbers lol, but i guess the biggest problem would be your guys IRS im assuming.

IRS only creates problems for the manual transmission guys, and in most cases it can be dealt with by using the proper tires and launch technique. That being said, an automatic is almost always quicker beyond the 300 rwhp level.

David

VicRattlehead
10-29-2008, 03:46 AM
Spend the money on some good tires instead.

why people try to go out setting speed records on street tires still amazes me. completely stupid if you ask me.

old_coot
10-29-2008, 10:18 AM
why people try to go out setting speed records on street tires still amazes me. completely stupid if you ask me.

Not wanting to set speed records but some of us actually drive our car "on the street" and want to know what they are capable of---without Johnny Law reaching out and touching us. Some of us think its kind of stupid to know what your car is capable of on slicks and have no idea what it will do on the street.....................Dan

Nate_V6
10-29-2008, 11:49 AM
and after that, touche!

ScrapSC
10-29-2008, 12:02 PM
Yep, Im with old Coot on this one. Some people want to know.

Jamez
10-29-2008, 12:03 PM
So even if traction is a problem, wouldn't you see the potential in the MPH? What was your MPH Roadhawg?

Roadhawg
10-29-2008, 12:19 PM
So even if traction is a problem, wouldn't you see the potential in the MPH? What was your MPH Roadhawg?

Well I still had traction issues with a set of MT 275/40 r17 DRs.
I'm sure the ET and Mph do not match. (1/8 mile)

2.0 60ft
8.4 ET
86.7 Mph

Quik95SC
10-29-2008, 03:49 PM
Well I still had traction issues with a set of MT 275/40 r17 DRs.
I'm sure the ET and Mph do match. (1/8 mile)

2.0 60ft
8.4 ET
86.7 Mph


I am running 7.97 in the 1/8 at only 85 MPH with a 1.73 60ft time. Absolutely no spin off the line with 26X10.5X16 ET Streets at 15 psi.

Just another example.

Smitty

Quik95SC
10-29-2008, 03:58 PM
Not wanting to set speed records but some of us actually drive our car "on the street" and want to know what they are capable of---without Johnny Law reaching out and touching us. Some of us think its kind of stupid to know what your car is capable of on slicks and have no idea what it will do on the street.....................Dan

Dan,
That is why you have normal daily driver tires (255/45/17 Nitto NT555's) and your track only tires.

My only question is when was the last time you were timed on the street? I blast mine on the street every now and again, but I have no idea how fast it is, no way to really tell. All I do is sit and spin at anything over 1/4 throttle anyway, so why bother putting the car and other parts through the suffering for nothing.

The exception to that is to see the face of some kid in a parent bought Mustang GT or new Pontiac G8 quit smilling. That is the only way I know of to see what it is capable of on the street, it has to be personal satisfaction at that point.

Anyway I do see your point, but just tough to measure it.

Smitty

Ira R.
10-29-2008, 04:27 PM
Traction? On street tires? What the heck is that?? Never happens. Any numbers I would get on the street would be totally misleading. Sort of like when someone asks me the car's 0-60mph time. Who knows and it doesn't tell me anything.

All I do know is the last time I ran street tires at the track the car ran 15's.

Ira

XR7 Dave
10-29-2008, 08:42 PM
i guess the biggest problem would be your guys IRS im assuming.No, the "problem" is the fact that there is a pretty small pool of SC owners from which to draw conclusions. Our "Fastest" list contains everyone who ever submitted a time slip to SCCOA so you can see that on the whole there just isn't much real interest in drag racing and 1/4 mile times. Most of the time slips that don't seem to make sense reflect people who have not put the time and effort into getting the most out of their cars.

Dan McEwen ran 13.40 with about 285rwhp on pure street tires with his full weight car (sans A/C) and he only goes to the track occasionally and certainly wouldn't be what you would call a 'die hard' drag racer.