Analyze this timeslip
 

Attached is my latest Timeslip
But first know my Dyno results were 233 HP & 222 TQ with an A/F ratio of 11.5.
I only have Intake and Exhaust.
yes, I have a manual.
The best I could manage was a 14.0 @100mph. I only got about 8 runs in and after adjusting tire pressure, spraying IC and figuring out a launch, I settled at 26 psi in the rear tires and launched at 3400rpms. I run susquential still at stock boost levels. How much room for improvement is there?
-feedback please.

Pics..

pic

The track sucked that day.. my best was a 14.5

I dunno bout you, but I get pretty good launches from 5000 rpms.

That's a good MPH. I bet you could bring the ET down a couple tenths if you launched it better.

Re: Analyze this timeslip
 

hmm......

The one and only time I've been to the strip, my best was a miserable 14.1 @100 mph. This was with a downpipe and RB exhaust and it was over 80 degrees.

I dynoed at 240 rwhp/225 rwtq. I also lowered my tire pressure to about 25-26 psi. Your 60' time is identical to my last few runs.

I guess we just suck at drag racing. :)

Not terrible. There is a some room for improvement if the car stays as is. If you upgrade the car more then the potential is limitless (to a point) :D

I don't think there is much room for improvement with your car and mods right now. You had a pretty good launch that time. I've only been to the track 1 time and I had a hard time with my launch although I had it perfected on the street. I just got a little nervous and wasn't used to having to be ready so quickly after staging. My best was a 2.2 60 time and I could tell that the launch wasn't perfect but it felt pretty damn good so I was shocked that it was not a near 2 flat 60 foot time. I had intake, dp, catback, pettit ecu, very mild streetport and ran totally stock boost and got a 13.5 flat on that run which was my best with that setup.

So I think you did all you can do with your mods and you are a pretty good driver. If you don't have a downpipe then that will be a huge upgrade for you. After that and the same 60 time I see you getting a 13.7

good job man

That is almost identical to what I ran with down pipe and high flow cat.
Now I have added a Racing Beat cat-back and a Power FC running the base map and with a passenger I ran 13.94@102.5 and 13.99@103. Following that I got kicked out for being in the 13s and having a passenger.
I know I suck at drag racing, and since these runs came about a year after the last time I had drag raced I am probably not getting any better. Maybe could be a bit better had I remembered to drop the air pressure in the rear tires.

Well thanks for the input.. The thing that made me question everything is my friend has an S2000.. with just Cold Air Intake ran a 13.8 @100mph.. Dynod right after my car and put down only 207 HP 143TQ. So explain that one! sure he wraps it out to 9k rpms. but if the weight and most everything else is similiar (body spec wise) and I have a huge advantage on power and torque... why is he doing so well? (without drivers - S2ks = 2900lbs / my 7 = 2800)
*TurboGXL.. which car was yours? I dont think I ran into you? is it red like in the pic? next time we'll have to meet up.
I got all my runs in early.

It's all in the launch. I ran a 13.954@99.45 mph on my very first pass ever with my FD with a passenger, outside temps were in the 75-85F range (don't really remember).

The next two runs without the passenger were 14.2 and 14.1.

A year later I took my now DP, Efini y-pipe and cat-back wearing FD to the same strip. First pass was a 13.97@100mph:(. A few runs later I slipped the clutch just slightly more out of the hole and turned a 13.58@102.85mph.

What I'm trying to point out is not what the fastest time someone ever turned with XXX mods, but what a difference just slight changes in launching made.

Jeff

What was the weather like that day at the track? Remember.. you are turbocharged/intercooled so air temps will affect the output of your car much more than an S2000. Especially after a few runs and the car just sitting after each run, the intercooler can heatsoak quickly.

Turbojeff, Im curious to know what you launched at and how much more 'feathering' you did?
Oh I kept my IC and other piping plenty cool with Ice and a spray bottle.

u guys must be at high elevation or have high miles. A FD with some light mods like that should run low 13s pretty easily. I ran 12.7 @ 111 mph with intake full exhaust and power fc on street tires..i know people with the same setup that run low 12s on ET streets.
When are you guys shifting (rpm)? how r u launching?

My launch is why I am slow. I let the clutch out too quickly because I dont want to burn it up, it has 74k miles on it now and I want it to last about 10k more.

How exactly do you launch to get a 12.7 on street tires with so few mods?

i dropped the clutch at 2700-3000rpms..tire pressure at 25 lbs..i cut a 2.003 60' time. this was my second attempt at drag racing so i am sure i could have done better. at first i tried 3500 rpms and got huge wheel hop..bad..very violent on the car.

i think another imprtant factor is that my car had under 25k miles last summer when i took it to the strip...it would be logical to think that a car with 70k miles wouldnt run as well.

hey......
 

my first tiime at the track...

all stock with boost leak coming from my bov. wasnt getting 10-8-10 or even close to it.

my 60 ft was 2.3.

1/4 was 14.0 at 101 mph. pretty hot day..almost 80.

looks like i had a better top end than you..just that i had boost leak and my 60 ft sucked due to wheel hop. :(

it should be better now...hopefully 13s. :cool:

Heres another question..
I tend to shift at 7k rpms. Do to the fact that my dyno showed power loss dropping fast by then. So need to wrap it out to 8k+ right?
and you guys who are running mid 13s with only a few mods, what your launching techniques?

I usually launch at about 4K rpm and get a little wheel spin, the one time I tried launching at 3k or below I bogged really bad. I have about 30k on my motor so it isnt tired yet, I think it is all in the driver skill or lack of driver skill in my case.

my observation
 

I've made few bone stock touring passes with a couple different 3rd gens.

My first try was a 13.9 @ 105mph, 1700ft, 80F, stock tires, wheel hop, 3000 rpm launch.

High 13s / Low 14s seem to be fairly typical from what I've observed if you get a half way decent launch and you hit the shifts. With a bad launch and a missed shift add a good second to the time.

My best 60' was 2.19 and that wasn't really a drag launch at all. I ended up running a 14.11, had to let off because the water temp was rising (on stock gauge). Didn't help though, she still overheated and popped the rad. :(

Wanna know the best way to launch? Rev it up to about 5k RPM's and then let the clutch out but your only half peddling it when you let it out, once you start going floor it! Now if you do this right you wont burn out at all and you wont get wheel hop and you'll be well on your way to having extremely fast runs along with launch improvements of your own. ;)

EDIT:I was just looking over everything else and noticed EVERYONE is only launching at about 3k RPM's........ why? You should be launching at around 5k RPM's like I said. You have to get the turbo's spoolin really good so when you take off you really take off, that's what the LSD was made for. It takes a lot of practice to get it just right at those RPM's, but it's very worth it when you look at your times afterwards. You may not get it just right every single time, but you'll have other runs you can do. At least try it out some before you start yelling at me for some reason, not sure why you would but thses are just my suggestions to you as I'm trying to help you on your launch, you don't have to take my advice. Have fun practicing and good luck on improving your times.:p:

Well, mine is 90 turbo, and I burnt my clutch up that day.

o......

OMG, I can't believe I'm going to agree, sort of, with you.

My launching techinique is hard on the clutch, you need to have the second turbo on-line when the clutch hooks up. That means I agree with the above method. Slip clutch slightly(like mostly hooked up, clutch foot releiving a little grip) while feeding in lots of throttle, keep it as close as you can to 4500rpm. You've got to do this fast of course, if you don't you'll really melt the clutch.

This opinion is based on an ACT street/strip clutch. If you have a stock clutch it'll do a lot of the work for you, by slipping on its own. If you have a metal clutch slipping it is hard and will destroy the flywheel and PP.

I also run about 22psi in my tires.

Jeff

See, I'm not throwing crazy shit out there, but it can even be done with a stock cluth.....I wouldn't recomend doing it more than once. But getting a stage 2 or higher clutch, with light mods a stage 2 will do just fine, is one of the best launch improvements you can make, along with getting a better LSD.;)

And everyone is shifting at 7k rpms?
since power drops off at that time.
And did I read that TurboJeff is getting 2ndary boost in first gear? I sure dont.

i get secondary boost in first gear...
i shift at the beep ~7500
the power fc makes it so u hold boost till redline

You should defintely get 2ndary boost in 1st gear. Make sure your 1-2 switch on the tranny is hooked up and working properly.

Jeff

1-2 switch..what is that?

this could be a whole other post in itself but wheres that switch at?

supposed to be at 10 at 3000 rpms and then 8 at 4500 and back to 10 at 6000

I'm pretty sure of this


I have a streetport so I shift 7500 always

thats crazy. I always figured it was supposed to be Primary Turbo only in 1st gear with stock ECU, cuz I have hard enough time with traction in 1st anyways. Can anyone else touch on this 1-2 thing to check out?

I don't really get much boost in 1st gear either. Every other gear I do, but not 1st. Maybe because it goes by so fast, but I never really see more than a few PSI in 1st. Like, 2-5psi max.

Here just so heat treated may read my previous post if he hasn't read this. In order to get rid of your traction problems in 1st gear and improving your launch, read up! :D If you get a stage 2 or 3 clutch and a upgraded LSD you'll definately improve your launch by doing what is written below.....happy boostin :D ;)

There is something wrong then cause you should be getting 10 psi.....here's how the pattern should be on stock twins and stock boost: 1k to 3k rpms should be 10 psi 3k to 4500 rpms should be 8psi for cross over and then from 4500 to redline should be 10 psi. So if I were you I would check into this and see if maybe there is a problem, boost leak maybe or somthing. Good luck.

thanks for rephrasing what I said
I bet it helped him a lot since you explained it nicely

there is a problem for sure if you aren't getting boost in first gear. How can you have problems with just a few psi in first gear a lot of people run 15 psi at the track on street tires?

oops, sorry snook.....I didn't read your posts carefully :p: my bad.

I get boost in 1st gear, just not 10psi...

Also, my boost pattern (when my car was last running) was 10-5-7. I didn't really get a good reading since the last time I really checked it out was at the track. I pulled a 14.11 @ 99.5 with the 10-5-7 pattern.

I'll be getting her back on the road, and probably buying a mityvac & compression tester to start troubleshooting the boost (mityvac) and to settle my worries (Compression tester)

You hit the nail square on the head. Launching is critical to ET. Anyone can MPH what you did, but low 60' will get you the golded numbers.
Sequential turbo launhes are a bit strange. You don't want too much rpm, because you will go into the secondary mode, but you also don't want too little rpm or you will simply bog.
I believe the best rpm is just under 4200 rpm. If you let out the clutch slowly and floor it at the same time, you can pretty much slip the engine just enough to pull hard, but stay in primary mode until you gain traction.

Only problem with this is you'll still lose traction. Like I said what you want to do is half peddle it or give it enough gas just to keep the RPM range between 4 and 5k RPM's and then when the last amber light hits let the clutch out all the way while you are still half peddling it then once your going floor it right away and again, if you do this right you will have a damn near perfect launch with little or no traction loss depending on your tires, LSD, and clutch. a kaaz LSD, slicks, and a stage 2 or 3 clutch will get you extremely fast launches using this technique!

my best time was a 13.5 @ 101mph shufting at 7500 rpm so i can stay in the max power range of the engine in the next gear! my 60' on that run was a 1.9 on street tires!

My only time out in my fd before it got into an accident was 13.2 @ 108 60ft was 2.3. I just bought the car a few weeks ago and i only had one run. I had full exhaust intake and pfc running 12 psi i think. My friend with a bone stock fd with just a dp ran 13.8 at 100 mph. You have to slip the clutch to get a good 60ft, but you have to punch it at the right time, too soon and you spin your tires, too late and you burn something out.i've never realy perfected the technique, my 60ft is usually 2.0. The act street disc holds up pretty well to this type of abuse.

my 93 rx ran a 13.6 at 109 mph. and that was rolling on a set of 18 inch adr wheels. other modifications at the time were apexi intake system, and the racing beat cat-back exhaust. i was launching at just over 4 grand. since than other modifications consist of sr motorsports intercooler, lowered suspension by 2 inches. apexi blow-offs, apexi digital fuel controller and boost controler. i also picked up a set of 8.5 m/t drag slicks. hopefully at moderate boost levels i will be hitting low 12's.

Well, I checked my 1-2 tranny clip. Everything looks ok there.
And do clarify somethings. My boost pattern in every gear but first is the 10-8-10. but in 1st gear, I only get 10psi Primary boost and then it drops off to like 3psi. Only in this gear.
Im gonna take you guys advise and try a launch of about 4500rpms and slip the clutch a bit more off the line. Thanks alot for the advice.

You suck at driving, I put down 220 completely stock and ran a 13.40 @ 102mph completely stock.

Damn Eric, bring out the dead why don't ya? lol
You're really pushing for the drag queen specific section aren't you? :D

I've got the fever :rlaugh: