Gregg K

Thank you for posting on your turbo project.

This is something I did back in 1979 with a car. I ran propane, and pressurized into the carburetor. I had issues with fuel delivery during the transition from normally aspirated to turbo pressure zone.

I've thought about how fun it would be to do this to my 928, but was worried about getting into a project like this.

So I'm living through your post. And it's pretty cool!

mickster

Dude-that is awesome. I've owned 2 cars with factory turbo (VW/Audi 1.8 Turbo from 2000-2003 and my current Subaru 2.5 Turbo) and both are mated to a 4 speed automatic. You knew when the VW was kicking in but not the Subaru. With a stick it's far more critical where the boost kicks in.

Are you building this for street or track?

ptuomov

The plan is to add some instrumentation and data logging first. Then the idea is to blow up the stock engine, hopefully without blowing up the transmission. Little destructive testing, just to see where the limits are for John's system with completely stock long block. After that, the hot rodded low-compression motor built by Jim Morton will go in. Those are the near term (2010) plans.

John's system is very well engineered. Still, it's a hug project for him to do an install. It's all John for now, but when I swap the engine I will have the opportunity to do almost a complete uninstall/install in the process.

This 100% street car, but I'll do some track testing. It's for spring and fall commuting to work, and maybe some fun runs. During the summer months, I am driving the wifey's 997 C2SC and during winter months the M5.

Those of you in the 200 mph club, here's a question: What's actually involved in driving at 200 mph in some timed setting? Just fill the gas tank and press the skinny pedal, or are there some bogus rules and regulations about "cages" and stuff?

Gregg K

I forgot to mention something that also plagued me. Cooling.

I'm curious what cooling issues have been noticed/addressed. My guess is that it will be an issue.

edit- I mean, detonation.

ptuomov

Working on it: https://rennlist.com/forums/928-foru...-tasteful.html

When I blow up the stock engine, I am hoping to blow it in some more interesting way than detonation. I don't think there's much to be learned from experiencing an engine being destroyed by detonation.

blown 87

There is little new ground there, that is for sure.

IcemanG17

Tuomo
My best guess is the stock engine will hold past 650whp.....maybe 750 when it starts to fail...but again it is highly dependent on tuning.....sure if you want to run 20psi on the stock bottom end using street gas...ya its gonna BLOW big time...but with race gas and proper tuning the power gains are really staggering....with sharktuner you really could make two profiles...one for street gas and say 1 bar and one for race gas and who knows how much boost....

As for the ORR cars breaking 200mph...there are SERIOUS safety rules...basically a full cage, fire system, fuel cell race car....I think the rules for the 1 mile events like Texas Mile might be a touch less....but not much....that might be a good venue for testing your machine

I must admit the thought of a 600+whp street car is pointless to me...since it will be SO powerful there is no way you can ever safely test it on public roads...since the speeds it can attain in seconds are super illegal....for example my M3 with under 400whp is a lot on the street.....it gets hyper illegal in nothing flat and I'm a COP...but I still worry....

However regardless of its "usefullness" I still think its a killer project....

Abby Normal

I don't care who you are, that's funny!


Great to see your project coming to the final stages.

dprantl

I bet the stock bottom end of a 928 is good to like 1500whp. It's not the bottom end that's the problem, it's the transmission, driveline and heads.

Dan
'91 928GT S/C 475hp/460lb.ft

Imo000

Well done but if the engine blows the "wrong way" it can take out the turbos too. Then if the cold side flys apart, it will send impller pices into the take, taking out the MAF and who knows what else.

ptuomov

Possible because of FOD from the disintegrating turbo on the turbine side. Overall unlikely since I will not be overspeeding the turbo and since I have the turbo speed measured, so FOD is the pretty much only way to destroy the turbos. Intercoolers will catch the crap from the disintegrating compressor if that happens, so MAF is safe. I don't have race turbos on it, so the impellers and whatnot will not be shooting thru the hood and bellypan in any case.

But anything is possible, and yes engine blowups have a lot of collateral damage.

FREAKINHEAT

Why hasn't someone made a plastic replica of this front mount intake? Aren't there hp gains to be made with a cai?

blown 87

How do you think the rest of us feel who do not have a "Get out of Jail free" card.

The chances of you going to jail for running triple digits is remote at best, they catch my white *** running 125 and I am going to jail.

Not that I have a problem with giving LEOs a break, it is just a fact of life, call it professional courtesy, unless a different department or some other LEO has a hard on for you, in most cases they are going to let you walk with nothing but a slow down.

Bill Ball

If you mean the open road race 200MPH club, only Marc and Susan Thomas and Tim and Cheryl Dey are in the 200MPH club, but I'm trying to get there this year with George Suennen. The rules primarily deal with safety equipment. No gauge or other bogus requirements. 200 MPH requires full roll cage, fuel cell, fire supression system, head restraint system, arm restraints, safety harness less than 2 years old, tires less than 2 years old, standard fire suit, gloves, etc. Also, there are rookie requirements that mean you must complete a few lower speed classes first.

ptuomov

I was just kidding around.