1.7 bar x 22-23 hrs = ka BOOM!

 

David:

Yes thank you for taking the time to provide so much information. Your numbers are at the upper end of what we see and discuss in this forum, so there is naturally lots of curiosity about what has been done to engine.

You will have you hands full in DE - I think maintaining a reasonable engine temperature is going to be a challenge. Short bursts are one thing, but running lap after lap...well that's a lot of heat that needs to find a place to go.

I didn't see it on your list so forgive me if you already have it, but an auxiliary oil cooler would be a smart addition prior to taking the car to the track.

 

Jeffrey,

It is a pleasure to go on this board and discuss our passion for our Porsches. This is my hobby and I enjoy it. Yes it costs a lot of money to play with Porsches but it is what I have always wanted. To answer you question. I am going to install C2 bumpers to allow for a Mocal oil cooler up front. I am well aware of the heat that is produced with an engine like this. I will be running 15psi boost and Mocal oil cooler. I am glad this has all the interest it is fun to talk about. By the way if anyone has been to a PCA event these guys make me look like small potatoes. Huge trailers and GT2, GT3 as well as 911, and 930’s. These people spend huge amounts of money on there cars. Why, because they enjoy the sport and their Porsches.

David
.

 

PCA Racing had very modest beginnings - lot's of stock cars modified just enough to get them within the rules. Those races today, are serious stuff with people spending as much as professional racing and for what? For the thrill of competition and love of the marque.

DE events are more subued until you get up into the advanced groups. In those groups. yYou better have good stuff lest you want to spend your track time with eyes glued on your mirrors.

Out of curiosity, why the C2 bumper? Why not a Ruf or RSR bumper?

 

Jeffrey,

I like the stock look. I think they look clean same as your car.

David

 

In my car, the oil coolers are positioned in the front wheel wells with the auxillary (RSR) located right in front of the A/C condensor. There was no way to place it in the front middle without a major hack job.

 

David - Even at 15psi, you're car is going to be very fast compared to most in the beginning groups at DE. You want you to make sure that you spend time learning to line & how to go fast in the turns. Plus you don't want to scare your instructor. I'd consider dropping the boost even lower.

Have you upgraded the suspension or brakes at all? If not, you might want to consider that as well, from a safety point of view.

 

Colin,
I have my upgrades early in this post. Coilovers, Big Reds, Rollbar Teamtech Harness ect. I know about making the instructor nervous and I have some race experence, so I know how to hold my lines. Be cool don't be a fool.

Thanks for the advice

David

 

Wow,

Those numbers are crazy, in a good sort of way!!!

Looking at the speed correlated to the hp and torque, from 89 - 99 mph the number jump over 200 for hp and 181 for torque.

How does it drive? From the dyno graph. I hope you keep it pointed the right direction when you squeeze that throttle.

Tinker

 

Glad to hear you've dealt with the whole package. There is nothing scarier than getting into a student's car that has more power, but stock everything else. Sounds like you've got an awesome track vehicle.

One question on the dyno graph...why does it curve back to the left at the upper RPMs as they fall off? That just seems a little odd.

 

It seems everyone thinks their dyno is the best. This could almost become a thread unto itself, but what makes you say "Dyno Dynamic are more realistic" and "Dyno Dynamics is one of the best"? (Hell, the people in the link you posted use a Mustang.)

I had read at one point that the "roller" style dynos could be inconsistent because of polishing and resulting slippage. In that 993 video you posted the car almost launches itself off the dyno (damn, seems to me the hub-attaching dynos are at least far safer!) and is only spinning one roller at the end. Running on one roller is a lot less resistance, no? Might that also throw off the measurements?

 

Based on Geoffrey's (our EFI guru) comments: "As far as RWHP numbers from a Dynojet, they are known to read higher than they should be since they are using estimating torque from the acceleration rate of a known mass (the heavy roller). I would expect a Dynapack or Dyno Dynamics dyno to read lower."

Not that I understand why still

I still think the only real dyno is rolling acceleration performance. Looking forward for some 60-130s from the Essa Tech monster engines.

Dr. Jupeman, your avatar is amazing. I have seen a few before , but this is the best PLEASE let me know where I can have one done.
Thanks

 

Jean,

A Dynojet dyno measures the acceleration rate of a known mass and uses the formula F=MA to calculate torque. The 'known mass' of a dynojet is the large heavy roller the tires spin which acts like a flywheel and does not really load the car which is one reasons you see turbo cars which have difficulty making boost properly. The Dyno Dynamics dyno (one of my two favorite dynos) measures actual torque and uses an eddy current brake to control load. They Dynapack (my other favorite) uses hydraulic fluid as a brake to control load. BOTH of these dynos are very accurate and repeatable with proper torque numbers. Remember that HP is a calcualtion HP= torque * RPM / 5252. They will read lower than a Dynojet because they do not have the intertia of a heavy flyweel helping the car along.

 

Charlie,

I never said it was the best I said one of the best and I was basing some of what I said on Geoffreys input on Dynojets. I will stand behind the repeatability of a Dyno Dynamics it is very good and excellent for tuning a car. I will have to find out if the rollers are connected and if that would make a difference. I think the hub attaching dynos are the way to go for the reasons you stated. When I started this car all I wanted was a well built fast car and I got carried away. I don't care if it has 600hp or 700hp it is fast, it runs well and it is a gas to drive.

Jean,
When I get a camera hooked up I will post the video.

Tinker,
I have only driven the car with 17psi boost. Before I had the Quaife differential the car got squirrelly in second gear when the tires would let go as the boost came in, but now it is controllable in second with the Quaife. I am going to run some 114 Gas this week I will get a video and let you know what the car does with 23psi of boost.

David

 

Colin,

I believe that is the result of the boost creep. ( Tial 46 wastegate being to small)