slim_boy_fat

See when you are talking about 18-20psi are they peak numbers@4500 or can you hold them right to the redline?

turbo951fan

I can hold any bost to redline with my Lindsey wastegate.

Chris Prack

Either turbo produced full boost by 3-3.2k rpm.

I will post more later. I have to work today.

Duke

Your HP and torque numbers are impressive and clearly those are some large turbos.
But that either turbo had full bost around 3-3.2k doesn't seem right at all when looking at the charts.
I'm not saying anything is wrong with it, but to produce those numbers at relatively low boost the turbochargers has to be pretty big.

Here's an overlay of your two charts I've done.
Reading of the torque curves it seems like the first turbo sees full boost at around 4k and the second turbo at around 4.6k.



Here's another overlay with your first chart and Guru Racing latest chart, both at the same boost.
Reading of the chart, the Guru car comes on boost earlier with a flatter torque curve, but to the price of 35 rwhp. Not saying any of the two are better, just showing the pros and cons.



So I really can't see what's so special with those turbos that they're worth over $3K. I think a big parts comes down to the hotsides. When talking KKK-hybrids everyone's scared of going with larger then the 8#. But when there's custom turbos installed I'm pretty sure many of them have larger hotsides, which is necessary to get to high HP numbers without insane boost (like 29psi )

turbo951fan

450 rwhp at 29 PSI (equals to 1.4 bar). Not very much impressive. What about longelivety?

OK, turbo is $3,200 plus custom adapter for the crossover pipe plus Motec4 plus plus

Hmmm about $10 K?

Probably on race gas because both John and Danno don't recommend going above 15/18 PSI with pump gas.

NOT very impressive, but impressive expensive!

Duke

No no no, 29 PSI equals almost 2,0 bar

Duke

And, I think you are mixing Rage2's numbers with Chris' part costs.

turbo951fan

Yes, you are right. Must be something wrong with my calculator. Thanks for the hint.

He was saying that the turbos are $3,000 to 3,200.

What about the rest?

Duke

Rage2 posted numbers of 460 rwhp at 29 psi (1,97 bar), and to qoute himself he uses a "cheap Garrett T04E with a KKK hot housing ".

Chris states numbers of 450 rwhp at 1,4 bar (20,6 psi) and he uses a turbo for $3,000 to 3,200

Hope that will clear up some things

turbo951fan

Yes, but the Garret T04E is a bolt on, the turbo Chris is using not.

rage2

Well, the big T04E's aren't exactly a bolt on either. It's got a pretty darn big housing, and requires moving coolant lines a little bit and shaving a bit off of the intake manifold to get the sucker to fit.

My new T04E upgrade has a .70 A/R housing with a 4" inlet. It fits even with A/C and alternator in the stock location, but it wasn't easy lol.

Chris Prack

OK, NZ951 this primarily for you! It looks like I F'd up. The street car that made the 360whp had more done to it than I remembered. I found some pics on my PC and it jogged my memory. Below is a pic of the IC pipes we made. Notice the port for the HKS bypass valve. Also I do remember a discussion about his injectors, he thought they had been changed but did not remember for sure. He was supposed to check a invoice from a prior shop and see what it said. It has a AFPR on it or a factory 3 bar. I can't remember which. It has the Tial wastegate as stated but also has a Apexi boost controller that I installed a couple of years ago..... The engine is in fact a 200+k mile engine that is completely stock (head,cam,intake,pistons,etc.).

I have included some of the pics of the turbo and such.

This does not change the fact that it does reach full boost by 3.2k and make the power stated on pump fuel.

Chris Prack

Turbo inlet.

Chris Prack

Wider shot showing intake.

Chris Prack

This is an adapter my had done on CNC.