atb

https://rennlist.com/forums/showthre...ar+mount+turbo

Old & New

Dave,

Do not try to teach a pig to sing. You are wasting your time and it annoys the pig.

Herr-Kuhn

O/N, where have you been good buddy? The BS gets thicker and thicker on this thread as time goes on.

Dave, for your amusement I did go and get the Battle of the Boost article from the August issue of Hotrod Magazine. This compares the power output of a CS, Turbo and Roots style blower. For what we 928 owners use, the roots portion of this doesn't count because the TS units used on the 928 kits are far superior to the roots unit tested in this article. Additionally, the roots unit used ran lower boost pressure then the CS and turbo, so the comparison is not equal there.

So, this brings us to the CS vs turbo. Both systems were non-intercooled. Both systems ran 9.5 psig maximum boost pressure. CS was a Paxton Novi 1200 (a known high performing unit), the turbo is most likely a Garrett, though it does not say. The engine is a mildly worked over 5.0 liter Ford...the same engine loaded on the same load dyno under the same conditions.

Here are the results for you to think about:

Peak torque CS: 561 ft-lbs at 5,200 RPM
Peak torque turbo: 617 ft-lbs at 4,200 RPM
Advantage: Turbo by 56 ft-lbs

Peak HP CS: 617 HP at 6000 RPM
Peak HP turbo: 600 HP at 6000 RPM
Advantage CS by 17 HP (but over only 250-300 RPM...this is where you shift)

Average HP 2,500-6000 RPM CS: 412
Average HP 2,500-6000 RPM Turbo: 460
Advantage turbo by 48 HP

Average torque 2,500-6000 RPM CS: 494 ft-lbs
Average torque 2,500-6000 RPM Turbo: 564 ft-lbs
Advantage turbo by 70 ft-lbs

Average race HP 4,000-6000 RPM CS: 518 HP
Average race HP 4,000-6000 RPM turbo: 555 HP
Advantage turbo by 37 HP

Average race torque 4,000-6000 RPM CS: 542 ft-lbs
Average race torque 4,000-6000 RPM turbo: 585 ft-lbs
Advantage turbo by 43 ft-lbs

So, many people who read and post on this board would automatically go straight for the highest peak HP number and say "617 is more than 600, so the 617 HP car must be faster" WRONG, dead wrong! You must consider powerband width and this is where the turbo is so clearly superior over the CS. In fact for street driving the TS is also superior. This is the reason you see both compressors of this style on factory forced induced cars.

From the article:

"Now forget the peak numbers and check out the rest of the curve. From 2,500-5,700 RPM, the turbo posted significant power gains over the Paxton. Given equal vehicles, the turbo would easily motor away from the centrifugal in an accelleration contest".

Dave, you claim it doesn't matter until it is proven on a 928. I've already done that and showed how a turbo 3-spd 4.5 liter was 0.3 seconds quicker across a 1/4 mile than an equally boosted 4.5 liter CS car with a 5-speed. 35% less time 0-60 and 15% less 1/4 mile time. Can you say the same of your setup?

What else is possibly required to come to an educated decision on this matter?

You are just mad because someone has the facts to prove you wrong. Get over it and be prepared to back up your bogus statements the next time you make them.

Ketchmi

Yup, right down the tubes but I expected it also. Most people are so tired of reading it that they won't bother to respond but I had to say something.

John, until you actually get your *** into a 10psi+ CS car and see what the hell I'm talking about, I'm done with you.

Imo000

John,

This is called MAGAZINE RACING. Kids on the Honda borad love doing this. Evenin that artivle the total difference is less than 50hp. Is it worth spending almost twice the amount of money for only 48hp?

At 10psi either boosting method will result in very littel traction. Therefore, comparing the 2, in reallife conditions will make the difference hardly noticable.

Ketchmi

Don't bother, he just doesn't get it.

BC

I resemble that comment.... I mean its not anymore. Well, its getting better. Way Better. As in I'm at 95 at the same place I was at 82 or so on my "test road". California has these - they are called the stop lights to get on the highway entrance ramp.

Old & New

I just dream of a board where the thread starter has admin rights... <insert lightning bolt here>

It would be sweet to stay on topic once in a while.

heinrich

Brendan, that was the US car

heinrich

Bill is back with a bang.

Jim_H

Jim_H

Unfortunately...
Originally Posted by heinrich
I for one LOVE thread hijacking, it's wht life's all about We're a bunch of people, and some of us are friends. We talk. We are not here to compile an encyclopaedia

Herr-Kuhn

Perhaps more discussion over tea and crumpets is in order?

hacker-pschorr

These are German cars - Wienerschnitzel & Beer is more appropriate