Is there another tuner in the world making this type of power/torque with a 996tt motor? The result of a <1.9 second 0-60 mph launch with stock internals.
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We ran into another problem. I could not use the Carrillo rods because they are for a 996tt crankshaft. We are using a GT3R crank. The journals on the GT3R crank are wider and the counter balance weights have a much narrower diameter. The GT3R motor uses titanium steel rods and these rods will not take the torque and hp of the motor we are building.

Carrillo needs six plus weeks to special build and we do not have that much time prior to the shootout. What do you do?

Rob King of S Car Go Racing contacted Pauter. Pauter said if we sent them a GT3R Titanium rod and a new stock 996tt rod they would design a rod for our motor. Pauter asked to examine the bent rods to determine how much power the prior motor was developing and approximately what amount of power it took to bend the stock rods. The new rods are being designed for 1000 hp. The good news is Pauter will ship the new rods one week after they receive the parts they have requested. The parts were air mailed today thanks to The Racers Group providing us with a titanium steel GT3R rod. :) We had extra stock rods thanks to EL750.

CJV,


I understand the GT3R rods are titanium steel, but what do Carrillo make their rods from to achieve the added strengh???


forgive me if you have covered this, or if it is a stupid quistion....:o

Fatigue is the major cause of connecting rod failure. At Carrillo Industries, we use proprietary steel, manufactured and forged to our own custom specifications. After experimenting with virtually every other reasonable material, we have found this chromium / nickel / vanadium / molybdenum FORGED alloy to be the best product to meet our stringent requirements for strength and durability.

Our connecting rods are fully machined to guarantee the removal of all surface imperfections in the forging. After heat treatment, each connecting rod is 100% magnaflux inspected and hardness checked, then machined to final size. Each set of rods is balanced and then shot peened to achieve the ultimate in strength and fatigue properties.

One of the most susceptible points of failure in conventionally designed connecting rods is the fastener system. At Carrillo, we have exerted a great deal of effort into developing rod bolts for specific applications. This effort has led to the utilization of four different bolt designs. The largest bolt available is a 7/16 inch diameter thread, fabricated either from AISI H11 tool steel or Multiphase® material. Many questions are directed to us regarding proper bolt selection. Briefly, the H11 bolt (WMC7 and WMC6) is a high quality, aircraft standard fastener, applicable to most high performance uses. Under racing conditions, we suggest that the H11 bolts be changed periodically. In comparison, the Multiphase® bolt (SPS-CARR) is designed to be a non-replacement type fastener.

Our manufacturing procedures at Carrillo Industries are fundamentally simple in nature: we blend the accuracy and repeatability of computer assisted machinery with the craftsmanship and attention to detail offered by qualified and concerned employees.

From Carrillo website www.carrilloind.com

Could you use the TT crank and Carillo rods (you already have) with the GT3 case?

ebaker,

The case is the same. Yes, you could use the 996tt crank and the carrillo rods. However, be prepared to limit your redline to about 7100 and the hp to about 750 at the rear tires. I would also suggest you shuffle pin the case. :)

Besides, I can't use the Carrillo's now, :( sharkster bought them.

Well, we should have our new rods from Pauter one week from today. The next part we need is the pulley/dampener. We are going to check again with The Racers Group to see it they have one so we can examine it for dimensions. If so we will have one made from aluminum. :)

Well, the rods have become an issue. Pauter finally started building them, however they require six to eight weeks to deliver. We will see them sometime between October 15th and the 30th.

Once we sent them the titanium GT3RS and stock 996tt rods it was discovered the GT3RS rods are .030 longer. To use that design would raise the compression ratio a full point which would be too much even thould our pistons were designed for a slightly lower than stock 9.4-1 compression ratio. In addition the GT3 crank's journals are wider in addition to the radius of the counter weights being shorter.

The new rods using the 996tt case with the GT3 crank will be a special breed 8100 rpm lower end, designed for the 996 turbo application. The rods are being designed for 1000 hp.

I'll have some pics as the work proceeds.

The rods have become an issue. Pauter started them one week ago and we will not have them until sometime between October 15th and the 30th.

The GT3 rods that go with the GT3 crank are .030 longer. If this lenght is used the compression ratio would raise a full point. We don't want to cut the tops of the new pistons down. In addition the GT3 crank has wider journals and the radius of the counter weights is smaller.

Will post some pics as soon as we have them.

Correct, the width is that of a 964 bearing, however the radius is smaller.

Yes, but the lenght of the GT3 rod is also different from the 996tt rod. If I had not already had the pistons built to the turbo specs we could have simply reduced the height of the pistons.

Actually we did reduce the compression ratio a bit when we had the pistons made, however not to 8.4-1. :(

Correct, Sorry I should have been clearer with my point. the GTIII rod is longer, however if the radius was the same on the GTIII as the 964 rod you could use the older rods instead of custom. The length of the 964 rod would have been just right. Moot point I know.

Stephen,

We looked at that, however the wrist pin size is also different. I believe 22 versus 23 mm? We can't afford any weak links with the power this motor will be generating. We want all the meat we can get around the pins.

Is the rod journal diameter of the 996TT crank the same as the GT3RS? Is there any difference between the street GT3 and GT3 RS rods/crank?
I was thinking that you could use stock GT3 rods/crankshaft to upgrade a turbo but apparently this is not the case (without getting custom height pistons).
What are the best and most economical rods to upgrade a stock turbo bottom end for a 700 - 850 HP motor? Carillo? Titanium? Are there are other lesser known custom rod makers that will custon make rods for Nascar etc. that would make a custom 996 rod?

964 is a 23mm. Same as the 3.2, 3.3 Turbo, 993 etc.