Spool better than a GT35R? according to who or what test results?

2.5L?

1997cc 85mm bore, 88mm stroke - stock 4G63

2270cc 85mm bore, 100mm stroke crank - stroked 4G63

2351cc 86.5mm bore, 100mm stroke crank - 4G64

2378cc 87mm (.020 over), 100mm stroke crank -4G64 .020 over

2433cc 88mm (.060 over), 100mm stroke crank - 4G64 .060 over

and you're still not at 2.5L, you plan on going .080 or .100" over?
or you can get a custom crank made with a larger stroke, or get the rod journals welded and offset ground.
Why do you say you will have cooling problems?

-Martin

 

With 2.5L, it'll have alot more exhaust pushing the turbine.

2.5 shouldn't be too hard. A 2.4L block bored. You can even stroke it for more, just need somebody to make custom crank.

I say, go the other way....De-stroke the 2L. Make a 1.8L that'll spin 12K rpms. Then you are into crotch-rocket territory.
Maybe with the new MIVEC coming out, the valve train could handle it....something to think about.

 

I'd speculate any reference to a cooling problem would mean that its possibly a sleeved block so they can indeed run a .080 or .100 oversize bore.. But sleeving the block could require siamesed cylinder bores and therefore potential cooling problems. But thats just my speculation (and how I'd try to do it) I'd probably also use a 2.4 block to start with to take advantage of the taller deck.

 

custom sleeves = $$$$ it can be done but we're talking a big budget motor. Hell if you have the time and money to do it, get 'er done!
I do believe they said they are only going .020" over though..so.....

 

i want details...
and a 2.5 motor.....if i get that...I'd be good to go!
supras skylines.....laterz for them..lol

 

Yah when I went back and read the first few posts I saw that.. If thats the case then its probably a 2.4 block with an overbore..

 

 

What makes this so much bigger than a 40R? Hell, it doesn't even look bigger than my GT3767... and if it IS so much bigger.. how the hell do you expect it to spool sooner? Physics ?

 

After many hours of talking to the manufacture of the turbo and running through different options we finally came out with something that can flow enough air to outlfow any other turbo that is being sold at this time from any other distributor. Then we looked at what we had to do to still make this thing somewhat streetable. Agian after talking to the manufacture they had some ideas they were willing to try out and so we went for it. We will know more within the next couple of weeks when we get it done.

Chris

 

Martin

I really want to say whats going on but you know what has to be done to get the displacement we are talking about. Nobody said it would be cheap thats for sure!

Chris

 

You never seem to not impress me!! All i can say about that!

Chris

 

OK so let me first say this. It does not flow as much as the GT42 (AMS cant wait!). I believe the GT42 flows 5lbs more then this turbo.

This turbo does flow around 20lbs more then the 35/40R though. And even though you are dealing with a heavier wheel to spin there are certain things you can do to help with spoolup. IE.. exhaust housings, tang devided to seperate the pulses in the engine, ceramic dual ball bearings, and a custom wheel itself that could lets say be 20-30% lighter then a normal wheel. Hmmm just a thought??

Chris

 

Martin:

I just wanted to say that your a great guy! There is allot of ways you can get to the 2.5L thats not a problem. Im sure you guys have thought about or are messing with the same things we are.

Anyway we will know more and should be able to give out everything in 3-4 weeks.

Oh and im not sure why i posted that .20 over thing on a earlier post dont know what i was thinking???

Chris

 

2667cc dsm has been built. 88mm is the max the bore can be. rest is stroke.

 

I would love to see a compressor map for this turbo. Also, typically when you take a larger wheeled turbo and cram it in a smaller housing to shorten spool times, you end up flattening the compressor map considerably and make it difficult to operate inside the turbo's efficiency range. As far as a custom wheel is concerned, I seriously doubt that anyone outside of garrett has managed to create a better designed and more aggressive wheel than the gt series wheels. Once again, I would love to see some hard evidence for these claims.