Russell's stuff is awsome- loving my maxtronic chips and scivison maf as well.

 

yup here here. Thats what im doing.

I'll wait on ordering from russell though until I have found a turbo.

Now I just need to find a fresh 27/6 turbo.

 

That's a pretty absurd statement IMHO. Lag is a product of several things, mostly from the end user: poor turbo sizing, not tuning properly, and understanding what boost threshold is.

 

money aside, k27 will get you full boost around 4000-4400rpm and a garret t3/t4R producing similar power will get full boost at 2800-3200rpm

imho 4000-4400rpm full boost is lag

 

If full boost is not online until 4400 rpm, someone has mismatched the turbo to the 2.5 engine - unless it's a dedicated race engine maybe, high speed track, where the top end valve train is put together for 6800-7200 rpm.

 

You're talking about a 27/8 right? From what I've seen a 27/6 should reach 15 PSI at around 3000-3200 RPM. The real problem seems to be that you can't run the boost very high with a 27/6 because of the backpressure from the relatively small hotside.

 

If you can spend the money get the t3/t4r it's bolt on and has similar spooling characteristics as a k26/8
https://rennlist.com/forums/944-turbo-and-turbo-s-forum/352032-turbocharger-review-pauer-tuning.html

 

Hey John, if you haven't finished or bought a MAF/chips by the time I get home, I'll let you take my car out for a drive. You can read what I have in my sig.

-Darwin

 

John,
Sticking to compare a K27/6 and a LR Super 61, both would probably meet you're goals. But for the long run, if i was in you're shoes, i would go for the LR super 61.

The LR S61 would have a lot more potential, you would probably not need to replace it when you look for more power (being said that you're power cravings are not too wild). The LR S61 would also create less back pressure (in theory) due to a larger exhaust housing, compared to the K27/6.

If you searched for the LR S61/65, the users recorded a ball park figure of 1 bar by 3,100-3,400rpms, which is acceptable.

The K27/6 is old school, but parts are known and reliable (KKK's are reliable as heck), Garretts are more efficient. Plus it is easier to upgrade the K26/6 to a K27/6.

That's , my opinion only. A LR S61 has more potential don the road than a K27/6 (it will run out of steam eventually compared to the LR S61).

 

K27/6 will get full boost by about 2700-2900. I don't think I have ever seen another aftermarket turbo on a 951 boost any earlier

 

I just purchased a scivision maf from Russel (should arrive in a few weeks). He told me if I ever upgrade to a LR super 61, I would NOT need to get new chips. I'm assuming () the same would apply to a K27/6 upgrade.

With your basic bolt-ons and a LR super 61, I think mid 300's would be achievable while keeping the quick spool up. Thats the power I want out of my street car down the road.

 

Im curious, for a K27/6, what is that level of boost where you are basically past its efficiency range? It seems for the K26/6, anything much over 16psi and you dont see much change in anything other than torque and high EGT's due to back pressure. What are typical numbers for a K27/6 around 15psi and say at 17psi (with the usual bolt ons).

 

I have driven a 2.5 with a K27/6 and was very impressed with the spoolup. Easily 15 psi in the low 3k RPMs and that was at altitude. I think it spooled better than the K26/8 on my Turbo S did. If a K27 meets your HP goals it seems like a great choice to me.

-Joel.

 

For myself, I'd have a little slower spool up for more than 323 whp, but I don't want much more....

 

John, I'm in the same boat. My 26/6 is shooting too much oil.

I'm leaning towards k27/6 because of the spool up, price doesn't hurt either.