Jean

This is the typical way I do it. If you look at the speed on the chart and how the red line (acceleration in Gs) compare, you will know when the acceleration starts. Typically I start at around 40-50mph and smash the throttle, nothing much happens then, it takes 1/2 second or so

Kerosene Kid

Hi Guys, great to see some likeminded owners on here. Thought I'd put my car into the mix for comparison. Started life as a 1994 993 Carrera 2 (I know that makes it not really a 993 Turbo, but it is a Turbo 993!) It has 993tt running gear, gearbox(clutch is std friction plate, with GT2 cover plate and an RS flywheel), torque tube, front hubs, wheels, brakes etc, PSS 9 suspension, and a GT2 type stiff axle kit. Engine wise, it has a late 964 engine (better bottom end than 993) with a TPC Turbo 'S' conversion fitted to it. A Motec M48 Pro ECU with datalogging, and an AVCR boost controller take care of the electronic side of things.

Now for the important bit! I did a few runs the other day, and got a 60 - 130 time of 7.53s, I obtained the time from the Motec datalog, took the the time from the computed RPM for 60 in 3rd, to the computed RPM for 130 in 5th. Also took some speedo video which was fairly close at 7.4s, but I put a little more faith in the datalog!

I did have the car dyno'd a while back, but the blow off valve was leaking, power was still 525hp even with that! I do have some more improvements to make, until I'm fully happy with things, ball race turbo, better headers, wastegate etc, but all in all it's still a pretty awesome car I think!

Regards.

TB993tt

Find your flat stretch, wait for it to be clear start off 1st then 2nd then into 3rd by 35mph then flatten it and set your hair on fire -you get used to knowing when 130mph comes up -according to your power level it is some time after you change into 5th gear -jump on the anchors and hope noone saw you

TB993tt

KK welcome to the forum.
What weight are you running ?
If you are 4WD to run 7.53s you need a lot of power (#depending on weight) and a sizeable power band which in itself would cause your standard clutch friction plate with stock GT2 cover to smoke itslef as the torque comes in. Can you get access to a GPS device like the AX or Driftbox ?

Jean

KK,
Welcome! Always good to see another performance addict willing to share openly!

If you let us know where you live, we can try to arrange for an AX22 to go your way.

To get that sort of performance your car must be seriously lightweight or have beyond 550+BHP if it is not that light.

What RPMs are you reading from on Motec if you don't mind me asking and what are your tire sizes?
Also, what turbos do you have on your car?

Welcome again and looking forward to see pics on a new thread.

Jean

I thought I would post the data that we already have graphically...
A couple of these runs I don't have the AX22 logs for therefore I need to update the distance once I receive the information.

The first grpah is not very clear, many lines out there, I will think of a way to make it cleaner. There is a lot of analysis that can be drawn from this and the next chart that shows the time needed to reach 60-130mph as well as the distance needed. All the runs are based on 2 shifts to make them more comparable. Woodster has only a three shift run. His times will be better if he gets a 2 shift run.

Things like weight, 2WD vs 4WD, shifting time (in my case with the sequential, I have an advantage), temperature and aerodynamics all have a substantial impact when estimating how much "good" HP each of these cars is making. It is not that difficult though

996s and the 930 do the runs in 2-3-4th gears while 993 do them in 3-4-5th as mentioned earlier. Certainly acceleration in lower gears is stronger, giving an advantage to the 996 and 930.

Kerosene Kid

Hi Jean & TB

Got to admit I don't know the weight of the car exactly, a little more than a standard C2, and a little less than a standard Turbo would be my best guess! As for your questions Jean, the RPMs are 4286 in 3rd, which I make to be exactly 60mph, and 5614 in 5th, at 130mph, the 3rd gear ratio is 1.56, and 5th is 0.94, with a diff ratio of 3.44 and 265/35 18 tyres, those are the figures I used along with the datalog to arrive at my times. The turbo is a single hybrid Garrett T36, which TPC produce in house.

TPC claim 570 hp at the wheels at 1 bar of boost, and that is without the benefit of Motec.

I'm in Southern England, and I may have already sourced an AX22, but if you have any nearby I could use, that would be great too!

Regards

Jean

Thanks KK.

I guess you mean T3-60 turbo or is it T36?

If you are in the UK, maybe be either TB993TT or Guy can lend you their AX22...

Bill S.

Jean,

You may wish to double-check the CGT. We measured a faster time...

Acropora

I hear that with the divider network 650hp is the limit. Kevin's old bud K24madness hit 530rwhp on the dynojet which apparently equals 650fwhp. Right about now I 'm wondering what 3.8 jugs, 60# injectors and evo cams were good for if the maf is the limiting factor.
Sounds like my smaller T04E 46 trim compressors at 1.2 bar should get within 50hp of your your 50 trim turbos at 1.11 bar. My current T04E's should be good for 690hp based on their flow.. Anyway, planning a 60-130 run after getting back from vacation and installing a new BMC air filter.
On the driving track the current combo definitely kicks booty.

KPG

Jean, that chart looks like a labor of love and sadly only 2 times do not have distances.... here they are KPG 8.59 in 1241.20ft 9Eleven 8.42 1223.84ft

Jean

Bill, thanks for the correction, it did look too slow. I will do the changes and repost.
KPG, thanks, I knew you would chime in

Acropora. If K24Madness had the horses he thinks he has, he would be in the mid 7.0s. with 4WD and stock weight. If he has 530RWHP in the dynojet, he is closer to 530FWHP real life, that's more like it, and his time would be in the high 8s. seconds with stock weight and 4WD maybe.

NineMeister

Jean,
Not checked this thread out for a while after being sidetracked with our g discussion.

Your last post raises an interesting question - with the excellent data you now have, in theory if we assume an average drag number for a 930/965/993tt it would be possible to produce a chart with weight of the car on the x axis, time on the y axis and giving "estimated flywheel power" as the result on the Z axis. Alternatively there may be a simple formula that can take the variables time & weight and output the flywheel hp. Is this something that you could work out? If you could it would be a very interesting development tool and performance comparator.

Red9

Colin- I am glad you suggested that-- I am relunctant to keep suggesting more work for Jean!! It is a good idea to gather data in one place that has a consistent credible check made that can be used as a comparative tool . It may save many repetitious questions and posts also.As another observation-- a considerable distance has already been travelled on the path to accuracy thanks to those that have challenged questionable claims and also those that have posted data and made it available for scrutiny.

NineMeister

Yup, easy to suggest it ..... but not so easy to remember physics 101 from university all those years ago!
An empirical approach should be fairly easy using the results Jean already has, a mathematical approach based on the empirical data may take longer to derive and I do not want to put any pressure on Jean to pick up the gauntlet, so to speak.