Well just getting things figured out for the build and tuning here since winter is dam near here sadly (high of 37 tomorrow)
I just ordered my new compressor wheels and will be building my turbos here to. Went with a 47.5/66/70mm extended tip wheels. Was going to go 18g size but thought this would hold the hp down and bit and spool faster for autox.
Car will have all the supporting mods
Clutch
Intercooler and hoses
Intakes (going mafless after talking with mitch from cobb)
Fuel system

Basically wondering what the limit is on the stock motor with e85. I want to be on the safe side tuning wise. It will be dual tuned for pump and e85. From reading I think 1.2 bar on 91 would be a good stopping point but can a guy run 1.4-1.5 on e85 safely?

 

unless you can log cylinder pressure or at least exhaust manifold absolute pressure its a guessing game. stay below 1.2 and the motor may survive. without know the history of the motor from birth to now its impossible to know how much it will take before breaking something. i ran 1 bar on e85 and 650 rewhip with ball bearing turbos. without a e85 analyzer your e85 tune may be to much since the pump fuels are very unpredictable. i have seen everything from e50 to e98 right out of the pump

my buddy runs a blend on his 335 and has to measure the ethanol content with every load of fuel to know how much 93 octane to load and mix with the current e content he gets out of the pump and runs the proper file based on the mixture

 

^^^^ hard to tell what pressure will be 'safe'. Just tune it out on the dyno and shoot for a 600-650rwtq max. Whether that's 1.2 bar or 1.5 bar and safely tuned then so be it. Pick up one of those zeitronix ethanol analyzers to monitor ethanol content and tweak flash/tune accordingly.

 

I dont see a problem running 1.4bar or so like A28 guys if you have hybrid K24, I did 1.5-1.6bar on A3076 on pump+meth so E85 will allow even more, keep the torque down if you can. A good boost controller to modulate boost/rpm will allow you to run even more boost up on top (1.5+bar), torque is your enemy not boost. Also ignition timing shouldn't be too aggressive if you want to run higher boost and keep engine happy, a good tuner will know to help you, make sure you contact one
1.2bar on 91tune sounds good to me and the maximum I would run

 

Fadi is right - boost controller is key. If you can limit torque to 650rwtq at 4-4.5k then hold 600 threw redline then your looking at over 700rwhp

Currently on e85 I'm running 1.4bar at 4K and the climbing to 1.8bar at redline in 3073s

 

They are k16 based turbos but i will be porting the housings and turbine wheel clipped which should help torque come on a little slower. Boost controller I will need to add. I don't think you can do boost by gear on the stock ecu with the cobb, I'll ask mitch on that.
As for ethanol level, I will probabaly tune the car on e70 and tune conservative. Most pump e85 up here is e75-e85 in the summer but I'll manually check before filling.

Pump will be the primary fuel with e85 only used when racing or the occasional mess around cruising night.

 

I doubt you'll hit the limit of the motor with those turbos. ���� well maybe...I dunno.

 

Ya well I was going to build 20g turbos but then I'd be right on that limit with e85 and currently I can not afford a super expensive rebuild. Already putting over 10k into the car this winter. I just want to keep its fast but fairly safe. Down the road it will be an engine build with efr7163 turbos or I'll upgrade to a 997, we will see

 

well sean hit 912rwhp with a set of k16/68 so yeah i think he can hit the limits

 

Wow, must have been a 20g size wheel then. K16/68 can be lots of stuff. 16g, 18g, and 20g all have a 68mm exducer.

 

68 hta wheel in a k16 housing

 

Ya the 68 hta is right between a 18g and 20g in inducer size but actually outflows most billet 20g wheels.

 

k16 based turbos to flow 900+whp?

thats gt30 or above and very high boost (2+++bar) for our engines. maybe 68hta compressor wheel can generate the flow for 450hp each but paired to another (much bigger) turbine, ust to have an idea, I did with my ex setup 916hp at 2.1bar with gt32 turbos and 80mm compressor wheels and a lot of timing mix of pump/ms109 and meth, no corrections of the dyno, so yes that is maybe 1000whp corrected on a dynojet, but I assure you can run 4s 60-130 all day long at that level, show me ANY k16 car with almost stock weight to do that and will change my mind, even a K24 turbine I guess can not hit real 800whp paired with any compressor wheel, put some corrections and everything is possible, dyno queen

 

Well it is possible with a k24/billet 20g. I put down over 450whp on my built sti on a td06 billet 20g which is sll the same sizes. But Thrn you are talking a 2.5l motor. That's at 27 psi on e85.
650whp would be fine with me. That plenty enough to get in trouble.

 

I meant OP's turbo choice, not Sean's super duper ported punched out huge exh/ comp wheel hybrid turbos. Haha.