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I was just going to quote you and your successes with twin scroll Rod. I know you were using them quite a few engines ago starting with the street car. That's why I went with the same turbo on our race engine based on your previous 3ltr Chris White block.
Is this what you used with the 16v long tube headers?
Have to admit I'm quite looking forward to Penguin getting his car on the road now. It's tempting to say he should have done this and that to it, but it was built for marathons rather than sprints. I'm guessing he bought his turbo around the same time I did, so it's probably worth 3-4 times as much now. So modifying it hasn't all been money down the drain.
Have to admit I'm quite looking forward to Penguin getting his car on the road now. It's tempting to say he should have done this and that to it, but it was built for marathons rather than sprints. I'm guessing he bought his turbo around the same time I did, so it's probably worth 3-4 times as much now. So modifying it hasn't all been money down the drain.
Ha...that's an interesting thought. You've potentially made money by doing nothing about modifying the car.
Penguin racer, "The GTX35 with a 0.83 will be amply large for a 2.7 running a big cam, throttle body & short runner intake.
-Will you be running this set up?
Patrick,
That is likely the single-most beautiful piece of **** in 944 history. This thread inspired me to read about the twin scroll. Interesting technology, but I see how much larger it is on your engine.
I get that twin scroll improves response & the torque band...but I'm done with spending more money on this four banger.
The sort of engineering...and I mean thoroughbred engineering... which is increasingly interesting me is with V12 engines...a configuration increasingly being relegated to the history books...but there are a few people keeping the flame alight:
Plenty of M120 goodness...and I also have a massive soft spot for the M275...but let's not get off topic.
I would agree that V12 engines are great, plenty of low down torque and some proper top end shove, but why bother with some German unit when this is what Italians do best?
As for not spending more money on your 4 banger you will wish you'd have gone for a 16V head... which brings the top end capability of an Italian V12, and you can trust me on this.
I would agree that V12 engines are great, plenty of low down torque and some proper top end shove, but why bother with some German unit when this is what Italians do best?
As for not spending more money on your 4 banger you will wish you'd have gone for a 16V head... which brings the top end capability of an Italian V12, and you can trust me on this.
Just when I decide NOT to pursue my 16v build, I read comments like that lol
My 2.5 made 293 whp on 1bar with a gt3076.
bolting on the gtx35g2 next week.
Sorry to hijack, but I'd like to know more details, since this is a similar sized turbo to what I have on my 2.5 on otherwise relatively close to stock build.
At the time of dyno
-What cam
-What exhaust
-What boost level
-Any mentionable mods
-Do you have a graph of the torque curve?
I'm striving for Intake Boost Pressure ; Back Pressure ratio of ideally 1:1 and hopefully not more than 1:1.2
The GTX35 with a 0.83 will be amply large for a 2.7 running a big cam, throttle body & short runner intake.
Aiming for back pressure to be the same as boost pressure obviously comes at the price of a higher boost threshold - something I'm prepared to live with as this isn't a daily driver.
If this car doesn't wake up until 4K, that will be acceptable to me given how I'm planning to use it. The cam is optimised for 4400 - 6900 rpm but I'll observe the stock redline for the stake of durability.
Thanks for sharing the pictures of your build. Very nice.
I think you will be there or thereabouts with the 4k spool on the larger turbo and good (low) back pressure too with that turbine wheel. In my experience though the 8v heads (mine included), no matter what we do seem to peak around 5750rpm so stretching the rev limit all the way to 6900rpm doesn't do much good as the engine is more or less done by 6k and torque drops off fast after that. Maybe your intake will help shift the power curve a bit more to the right but even with a Milledge cam on mine it made little difference, just more torque.
05-25-2023, 09:28 PM
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