Gstt

Just got back from the track.
Gs in full motion on slippery track.

couldn't get traction when power braking, spun all the way from 1to 2 to 3.

ran 15.6 @ 95mph on 94octane.
Last time : 15.1 @93 mph. on 110 octane.

My friends 1.9L SIR busted 13.8 @102mph and on the street start he's only half a car ahead of me. I keep up nice.

I felt big difference without the system in the trunk, and on usual 94 compared to last time i was at the track.

i'm thinking i could have hit 96-97mph if i griped.

2000 gs400
SRT intake + chip

does this sound right???????
what are typical runs with this setup( 1/4 + mph)??????

Guru

I say try going back to stock and see what you get. I bet you get better times.

JBrady

The 95mph is encouraging. When I spin hard I am way in the 15s with an actual 16 on one pass

Getting traction out of the hole is not easy with an open differential. Practice, practice, practice. When you can get consistent 2.2s or less you are going to be deep into the 14s. You may wish to get a spare set of wheels and mount some drag radials. You could get near 2.0s on a perfect lauch.

Gstt

My car is dyno's at 255hp and 260lb's of TQ (RWh)
its 4 sure faster than stock where i got 229hp and 235lb's

I launch perfectly at street start, the track that day was crazy.

so much rubber and everyone is doing burnouts,
when i do a crazy one i slip even more on launches, dono y?

roenick7

The better the launch the lower usually the MPH will be. FYI. And the better the ET will be.
Notice your 15.1 was at a lower MPH because you had a better launch. Read you printout and see the 60' time;1/8mile;.... this will be your best friend on what to do. The ONLY way the octain helped that much would be if your 60' times were the same on both runs and you progressivly got faster as you went down the track. I don't think that happened. Please post the times I would be interested to see.

Good Luck Go Fast!

JBrady

If you can post the entire slip as there is a bunch of data that can help point to faster times.

I agree that quicker runs can result in slower MPHs but that is more accurate on a car that is yielding consistent results. My cars quickest AND fastest pass were one in the same. Generally the quicker 60ft time will hurt MPH but ususally only slightly. With 255rwhp you should be seeing high 90s to 100mph. Do you have a bunch of extra stuff... stereo, golf clubs, weight set... in your car? For optimum times you want the lightest race weight. Go with 1/8 to 1/4 tank of gas, no spare or jack, empty trunk, ect.

GS400_PUSHER

Scan your time slip and post it. Your hp and torque is close to mine so you should run low 14s on those 17s. What was your 60ft times...please post them that would help. Also let some air out your tires at the track, I think I had 24 psi in mine.

Gstt

Here it is:
1ST RUN 2ND RUN
R/T: 1.340 0.173
60': 2.923 2.792
330: 7.830 7.101
1/8: 11.353 10.472
mph: 71.54 73.53
1000: 14.285 .000
1/4: 16.709 15.765
mph: 93.86 94.91

both times ****ty, both runs i'm burning out in 1st and 2nd gears

2nd run i left right before the light dropped so thats why i got a 0.173 reaction time

i'll try to find track times with the 110 octane gas. I busted a 15.1 at 94mph with full system. good traction though. So i thought i was just the octane and system hurting me.

but this time (no system, and on 94octane pump gas) No traction

roenick7

I would still want to see the 110 octain run.

definitly a better launch AND pull on the second run. Maybe you didn't get seconds as bad and was able to put the power to the ground better after the 1/8 mile it was pretty even only the MPH helped you out going into the 1/8 on the second run to beet the 1st runs 1/8-1/4 time. So what ever happened in the first 330' or so really helped your second run. I would bet your other runs would be more like run 2 if you were to race 3-5 times. (average)

Good Luck!

JBrady

Next time start WITHOUT powerbraking at all. Spinning through 2nd gear is KILLING your ETs and MPH. Once you master launching without powerbraking then slowly add powerbraking in until you can launch with just a slight spin AND I mean SLIGHT.

Here is my 14.5 run for comparision

R/T - .636
60' - 2.229
330 - 6.222
1/8 - 9.468
MPH - 76.00
1000' - 12.252
1/4 - 14.577
MPH - 97.29

Notice I am almost a full second faster through 330 feet and more than a second faster through the 1/8 and these are on my mediocre 2.22 60fts. If you can equal my 60fts (practice but very doable) you should beat my time.

roenick7

I disagree with NOT Power braking. If you do it right you will get a better launch. Hense "Launch control modules" which activate off a button.

RT .786
60' 2.1
330 5.892
1/8 8.84
1000 11.331
1/4 13.45 @ 105.8


nos NOT ENGAGED until after 60' (power brake launch @ 2200rpm)

good luck!

Gstt

I am pretty good @ launching my car, at the track this time i had no traction. I know my car was faster, and i know on 94 the car runs better than on 110. my MPH was much higher even though i did not change gears perfectly without going to the rev limiter.

also apexi rev-speed;apexi SAFC do how much for your car???
Can be combined with SRT intake to run better?

DrRick

good job, bro. alot of people talk about how fast their car is, but few have actually timed it down that 1320'. it sounds like the track was terrible, by indication of you 60' times. try brake torqueing it at about 1500 or so, if the conditions are that bad. or maybe even just a regular launch with no brakes. by looking at your mph, it seems that you are making pretty good power. you just need to get that launch down. for comparison , here is mine from about a month ago.........



R/T .... .888
60 .... 2.261
330 .... 6.246
1/8 .... 9.498
mph .....75.3
1000 ..... 12.288
1/4 .... 14.618
mph .... 96.6

hth...


Doc

roenick7

I ran the apexi SAFC with the srt intake minus the ecu chip. I found that with other mods mainly exhaust this control helps. If you have stock or just diff. mufflers and the new SRT ECU/intake the HP is about the same.

I would rec. the Apexi SAFC only if you do not have an upgraded ECU ----OR---- have done other MODS which change the air fuel ratio, back pressure (exhaust). Again mufflers don't count.

JBrady

I said start without powerbraking and slowly add it as he gets the feel of it. Burning through 1st AND 2nd indicates TOO much enthusiasm

BTW, was your 2.1 closer to 2.10 or 2.19? I would have thought 2.0s or even better would be doable with LSD and TC. What gears? Have you considered drag radials? I was able to cut 1.96 with my old V8 TBird with LSD, 3.55s, 314rwtq, on plain old Discount Tire 245/50-16 radials with a 5 speed manual and clutch. My 2.2s (fairly consistent) are with my LS is peg leg, stock TC, 225/60-16 RE33s... I gotta believe with gears, LSD and TC that I would be 2.0s??? Can't say for certain until I do it but that is my gut feeling.