i going thursday night to run some qtr mile runs . they sell 110 octane &114 at the track but it is expensive .do you think this will help very much for the $.i'm planning on making several runs
1st run i will shift at 6000rpm's
2nd '' ''' '' 7000rpm's
3rd '' ''' '' 8000rpm's
4th '' '' ' ' redline
i want to see how the car reacts to different rpm's and see if it is pumping too much fuel for the car after 8000. someone posted earlier that shifting at or after8000 rpm's you lose speed in the 1/4 mile .i will post results friday morning.

 

Go to the tech section/do a search. I don't think that high of an octane is good for the car.

 

High octane isn't bad, but odds are the 110 and 114 is leaded gas so I don't suggest using it.

 

Really? I thought highest octane was always best? And after a certain level, it didnt matter cause there wasnt going to be any predetonation for sure...

 

Your not going to get a 14 anything at those shift points if that was your intent. To get the best time its MHO you have to shift at 9000rpms and be so quick about it, so quick that you might bounce off the tach because you got back on the gas too quickly.

Moving to Comp Racing.

 

I think he meant in different runs he was going to try starting from different RPMs, not shifting at those speeds in each gear.

I think.

 

ooooooo i thought he ment 1st 2nd 3rd and 4th gear and i was beating my head at him in that case, Make sure your spin the wheels before your drop!.

 

i find i got the best time reving to where the torque peaked and the sliped the clutch. just my 2 cents though


Oh and beware the super wheel hope if you got the stock suspension. LOL

 

I second the alert on the rear axle hop. Its a real pronounced bunner. Keep us posted as I am really curious s to your results. You may even want to have a freind film you and share it on this forum (if that's possible!)

 

C&L makes unleaded 116 octane fuel..try that...they sell them at some 76 gas stations...

 

please show some results, really interested

 

I have experimented with this theory about shift points with the 8, I have found out that 6000 RPMs is a better shift point. search some of the CZ unit threads and you will find AFR maps after 6000 it gets really messy and robs you of power which explained why I got better times shifting at 6000 rpms rather than 9000, that puzzled me for the longest time. Also tonight I'm going to my local 1/8th of a mile and I'm going to use my canscan tool from Auto Enginuity to log all the data. I'll try to post the graphs and data tonight or tomorrow.

 

what you get for a 1/4 mile shifting at 6000 rpm horse ?

 

we to the strip last night here are my times.temp was 64 this was my first time on a track so dont laugh too hard.
1st 2nd 3rd

rection1.398 .720 .966
60ft 2.248 2.415 2.361
1/8et 9.894 10.184 9.964
1/8mph71.77 70.64 71.54
1/4et 16.031 15.685 15.684
1/4mph62.92 85.35 ?

the first run was with dsc/tcs was ingaged droped the clutch at 4000rpm's shifted at 7000rpm's missed 3rd gear wheel hop was not that bad.
2nd run dsc was off dropped the clutch at 4000 wheel hop was so bad i had to let off the gas .then shifted at 9000 just to make up the the wheel hopping.
3rd run dsc off featheered out the clutch at 4000 wheel hop was not bad until i hit 2nd gear shifted at 8000 this felt like my strongest run besause i was in control the whole time and the car just ran good.mine is stock and with it being stock i don't think i can get into the 14's .

 

hmmz not bad , you only had 1 run ? .... you needa launch better ... seems like you were bogging or wheel hopping from your 60 time

 

IN 1st &2nd gear this car with dcs disappled it wheel hops so bad you have to let off the gas or it will shake your teeth out .i know my reation time sucks but it was my first time on a track .if you dump the clutch you are screwed you have to feather it out or your dead.it doesnot stop wheel hopping until you get into 3rd gear.

 

This wheel hop issue really drives me nuts. There has to be a better way of solving it without ruining your clutch on launch or having to replace the suspension and stabalizer bars.

 

Maybe tires could help a bit. Although, the mere thought of stickier tires gives me the creeps and makes me think of broken trannies and diff's.

 

Pettit has something they mentioned to tone down the wheel hop, I forget what it is but it was on their site. My best 1/8th of a mile is 10.3, and that was my first time ever, shifted at 6000.

 

After installing the coilovers (more damping and spring rate) my wheel hop is gone. When KYB, Koni or Tokikco (SP?) come out with adjustable shocks for the rear they might be useful in killing your wheel hop.

 

Ok granted the AFR richens a bit after 6000rpms but to shift at 6000rpms is just plain wrong, think about it. The max WHP you have at 6000rpms is around 150WHP give or take, opposed to the 180-190WHP you have at 9000rpms.

No matter how power efficent your AFR is (close to 13.5-7 in the 8) at 6000rpms its not going to rob you of 30-40whp.......... i just don't know what else to say.

 

well, I'm just saying what the timeslips told me.

 

Your timeslips are wrong. A 1/4 mile race is all about horsepower. You make more horsepower at 9000 rpms than you do at 6000 rpms. Telling people to shift at 6000 rpms will only lead to people running 16-17 second 1/4 mile times. You might as well tell them to start in 2nd gear while you're at it. :-)

 

Hey! that's my technique for Texas Winter Driving.... :p

 

Horse, you don't know what you're doing. Your numbers have proven that.

Sorry.