Awesome setup joe. But there seems to be alot of turbo lag, what turbos are you running, GT35r's, also, about where in the rev range does boost come on?

 

Joe is using EVOMS' GT800 turbos, same as I. The compressor is a Garrett GT30. The dyno video does not accurately reflect the lag, as they were not accelerating at WOT. Rather, they did not go WOT until well into the rpm range, at which point the turbos kicked in quickly. These turbos unquestionably lag more than k16s, k24s, or even the GT700 turbos which use a GT28 compressor. On the other hand, they make more power when they kick in. They tend to spool in the 3200-3400 rpm range. By comparison, the GT35 turbos have even more lag, but make even more power.

Craig

 

Well said Craig.

 

I have a gt35r on my evo 8 that runs low 10s.... its on a 2 liter motor. I really like it. we put in the 30rs on evos that road race the cars and gt35rs and up on cars that 1/4 and or street race....
this is a pick on engine with a set of gt35rs.... I had a choice and could have gone with a set of gt30rs... but went for big power since I do not road race the car... BTW_ Alexander has the same turbos....

 

There is no doubt that a GT35 equipped turbo will make more power than a GT30. Larger compressors generate more power. However, larger compressors also lag more. I have driven briefly in Alexander's awesome 996TT with GT35s. It has more lag than a 996TT with GT30s. On the other hand, it makes more power when the turbos hit. EVOMS tested GT35s on one of their shop cars, and was so displeased with the additional lag that they switched back to the GT30s, at the sacrifice of additional power.

Personally, I chose the GT800 turbos (GT30 compressor) as a balance between power and lag. EVOMS would gladly have strapped on a couple of GT35s if I wanted them (they have a set laying around that they removed from their car). I personally did not want any more lag. That being said, I certainly understand why you and Alex went with the GT35s. They have considerably more upside power. My car will never make as much power as yours or Alex's car. Joe and I have basically pushed the GT30s to their absolute limits at around 900 hp (+ or -). In order for us to generate more power, we would need to go with GT35s. At present, I am not willing to accept the additional lag. Of course, that may change once my current set-up loses its thrill (just as my previous set-ups did).

On the other end of the spectrum, the GT700 guys are constantly raving about how quickly the boost comes on with their smaller, yet mighty powerful, GT28 based turbos. These guys would probably be disappointed with even the GT30 lag, let alone the GT35s. The GT700 owners have sacrificed even more power in order to have nearly instant boost. Having used a K16/K24 hybrid for a while that spooled incredibly quick, I can relate to the thrill and excitement of minimal lag.

There is no right or wrong answer. It is all a matter of personal preference, and achieving the balance that works for you. Just as Alex loves his GT35s, I suspect you will as well. Who knows, maybe I will join you there one day, begrudgingly accepting more lag in order to generate more power. However, for now, I personally like the balance achieved by the GT30 based GT800 turbos from EVOMS.

Craig

 

Craig, once again you have articulated your position well and gave good quality information. Great Post..

 

Originally posted by Craig
.......Who knows, maybe I will join you there one day, begrudgingly accepting more lag in order to generate more power. However, for now, I personally like the balance achieved by the GT30 based GT800 turbos from EVOMS.

And our motors and fuel systems were built to handle the gt35r's if need be.It will be a easy turbo swap and file download if you choose to do so.Also our setup has only lost about 25 hp down low as compared to a GT700 while still producing 200hp more upstairs!!

 

Thanks Kenny.

Craig

 

Thats true Joe. We have plenty of excess capacity, both inside our engines and out.

Craig

 

I agree with you guys... and the shop that builds evos like mine installs gt30r all day long... and Craigs headwork is a one off and I think his car can handle the extra extra power... and then some more... plus, since we have crazy heads we can not only flow alot more air but also go +8000 rmps... which means that even if u have LAG down below... now you can take it up to 8K b4 you shift... you gain the extra 1000 rpms up on top but sacrifice it below... thats exactly how my evo is... I have 9800 rpms. Todd K told me that with these redone heads the power does not taper off like it does on stock heads... so my HP will keep increasing as the rpm range goes up... all the way to the end. BTW- Alexander is going in for the GT40rs... very very soon... From what I was told Chad is as well.
I think both set ups are very good... Im scared to go to gt40rs... things break.
Since some of you guys have really good access to evoms... you really should, if not done yet, get those puppies(gt30rs) water cooled... serious.. and not because I have it... but because it prolongs the longevity of the turbo by keeping it cool.
I stephen mentioned that anyone interested he has the set up to do it.
just my honest suggestion from already blowing one gt35r in my evo 8. I learned the hard way.

 

Mark,

We are tuning for GT30R's and GT40R's. The 30's for the track and the 40's for the strip. Our motor will withstand 1500 hp.

Back to your's. Your motor is the cutting edge of 996tt science now. The most anyone before had was GT3 exhaust cams. You have GT3 intake and exhaust cams and GT3 heads. This is a first for the 996tt. I would expect having the experience of Alexander's car along with mine that in a few weeks your car will be the fastest 996tt currently running. We also can't understate our tuner and in you case engine builder ......... Mr. Todd Knighten.

Our motors will be simular yet different. Our CID is much larger (bore and stroke), we use NOS to eliminate the lag below 4200 rpm's, our crank, rods and pistons are probably 40% lighter, oil system is proven to service 1500 hp Porsche motor's, the internal case windage in minimal, the heads flow about the same but our heads will run about 800 degrees cooler and the valve train is about 50% lighter. Our cams use the same number of pointers but our lift is about 100,000ths higher and our duration is shorter.

The good part about your's is at the rate we are going your motor may be worn out before I get mine in the car.

As a side note, you should be seeing my axle's any day now.

With the exception of a few people, most don't yet really undertand or appreciate the class your motor and ecu really is in. I will be rooting for you. Can't wait to see where she comes in at.

 

And the best thing about it is, all of you guys are knowledgable, push the limits and raise the bar, are friendly with each other and very humble, what more can the Porsche world ask for

 

Chad,
thanks for the gt3 cams.. couldn't do it without them... and the axles...
it will be interesting that's for sure.

 

We have never personally met, but we are beyond friendly. In Markski's case I provided cams and axle's when requested. Alexander and I have shared what I would call secret information and Todd has assisted us in cam pointer development/placement in conjuction with keeping the 996tt ecu while using GT3 type intake and exhaust cams.

Markski's motor is using the exact same technology, as a matter of fact, they took our cams and came up with an answer re: making them work with the 996tt ecu. We had been working on this one item for over six months with little success, multiple cams, pistons, valves and tappets being custom made and discarded. It is hard to describe the magtitude of this success.

Grab a seat and enjoy the show because when Markski publically announces the results, everyone will understand what I am talking about.

 

Markski,

What have you done with your gearing. The stock first and second will be worthless.