Hi,

How i can get more power high rpm?
Can i tune tihis car better or something?

My setup:

13b full bridge ported engine scr apex seals (two piece)

turbonetics T66 TURBO, 60SE-BB-H66-65-TUND0_81
60 series compressor cover with a HP66 (66mm) compressor wheel. F1-65 turbine wheel in a tangential undivided .81 A/R housing. Ball bearing

Injectors 850/1680cc fuel pump boch044 stock lines.Re wired.
Big inter cooler
4"down pipe 3.5" exhaust
devil own water/methanol 50/50% injection 800cc injector start 12psi (0.8Bar)
BMC dual air filter
HKS Twinpower
NGK R6725-10.5 plugs with better ignition wire

Apexi power fc tuned 18psi(1.2bar) ar 11.5-12 timing 10 split 8-9
Fuel octane 98 premix 1:100

Stock intake manifold throttle body and ignition coils.

Dyno results:
How i can get better power after 7000rpm?


Ignition maps:



After dyno i change injectors 2200cc

Please help,

Best regards,

-Postert

 

I am no expert but to get more top you might need to go bigger on the exhaust housing and turbine.

 

12 Afr!!! That's lean IMHO for that octane
Well the turbine looks out of steam, boost begins to taper off at 6500, so does the power...but only at 18 psi of boost, it should make 20-22 b4 the 66 looses steam, but the.81 ar housing killing your top end regardless
I would start looking at why your loosing boost pressure 6500 an up, loosing 3-4 psi of boost a lot up top there

 

Hello,

Yes, i think at the wideband meter looks 0.5 afr wrong, correcrt afr is 11-11.5 and this is water/metanol injected.
When we tune more fuel high rpm we lose power, i dont know why.
exhaust temperature is only 1400f

I control boost with apex boost control kit.
When i turn boost up abaut 21psi boost curve looks same but high rpm boost is only 19psi.
And other problem is boost wave.

Maybe my wastegate spring is too weak?
Maybe i have change my turbo bigger.

I really need top end power because i drive my second standing mile next summer.

Thanks for helping.

 

Get a bigger turbine housing, and better coils( AEM smart coils) for starters.
I've tuned several cars with extremely similar setups and the curves are pretty similar.

 

This one is really easy. Put a bigger exhaust housing on and re tune for the extra flow.

divided 1.0, 1.15 or 1.32 exhaust housing and use a few more psi. I would guess you've got 100-120hp extra you can get, in that setup but it will require more boost to get the whole 120hp you have sitting idle in that compressor wheel. In my opinion that is too much premix, I've never had good results with more than 150:1 ratio. Also I use R7420 plugs, and I think 10.5 is too hot for the trailing hole.

They are not 1680cc/min they are 1600cc/min injectors.

2x850cc + 2x1600cc is flirting with problems on a single 044. I wouldn't depend on more than 4000cc / min from that fuel pump assuming a 5bar head its pumping into, in fact the flow does go lower depending on the boost pressure and base FPR pressure.

 

Hi,

I probably buy new divided 1.15 exhaust housing.
I change premix 150:1 ratio.
Do i really need better coils?
Maybe i need other 044 pump?
Fit this exhaust housing my turbo?
http://www.ebay.com/itm/TURBONETICS-HOUSING-T4-Q-TRIM-AR-1-15-3-V-band-20697-4-/270879217740?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item3f11a8d84c
Thank you very much.

 

larger divided housing for sure... 1.15 sounds good

 

I think i need this housing 21600-65
Turbonetics 21600-65 - SummitRacing.com

 

Can some one help?

i need bigger housing ar like 1.15 not pigger turbine wheel?

 

I would try the 21600-65 turbine housing first, but double check fitment with the supplier!

67/65mm turbo with 1.0-1.32 is a high 9 second 1/4mile ET turbo on a well setup car.

Seek a 2nd opinion on the fuel pump but I'm fairly sure you are close to the upper end. Most people on this side of the pond use 2 044s for anything more than 500 on a pump fueled rotary.

 

That timing above max torque is so outdated and goes back to the days of using a distributor for making spark. It not only cost you some high end power but also increases EGT there.

Reminds me of at lease two tuners!

 

Maybe this is better. Split is same 8-10?


I order this 21600-65 turbine housig and i check fitment the supplier.

Thanks.

 

Yes that is better high rpm timing. You probably could go to 2 degrees increase 7200.
Many would also say that your split is too low for higher boost.
Your 16000 PIM split is out of sequence.
I would go to 10 split at 20000 PIM.

Your turbo turbine AR is too small if you want a flatter high rpm curve.

 

Thank you.

I order 1.15 ar turbine is this also too small?

 

That is way better.

 

postert the pm was the answer to your thread here

 

New divided exhaust housing A/R 1.15 is installed old was undivided A/R 0.81
Now high rpm boost is stable 1.5bar and i can feel difference :-)
maybe i turn boost up abaut 1.6-1.7 bar

 

What sort of exhaust manifold for the turbo are you using? Is it divided or undivided?

 

I'm very curious to see difference in spool times and peak power.

 

Hi,

exhaust manifold is divided. Car is tuned 1.6bar (23psi) but i dont have dyno results yet.

-postert

 

It spool abaut 400rpm later, but car pull hard high rpm. rpm limiter is 8200 maybe i change it 8500rpm, i post dyno results later, maybe this month.

 

Can you please record some data of you driving in 3rd and 4th gear. Cruise at 10% throttle and then completely open throttle to 100% @ 2000rpm instantly and show us the data of boost vs. rpm.

 

3rd gear

Start 2900 rpm
0.5bar (7.5psi) 4100rpm
1.0bar (14.5psi) 4600rpm
1.3bar (19psi) 5000rpm
1.5bar (22psi) 5400rpm
1.5bar (22psi) 8200rpm

My bosch 044 fuel pump is too small, fuel pressure fall down.and afr is too high.
i have to install other 044 pump and new fuel line.

 

Yes, i think at the wideband meter looks 0.5 afr wrong, correcrt afr is 11-11.5 and this is water/metanol injected.
When we tune more fuel high rpm we lose power, i dont know why.

Do i really need better coils?

I would say if you are having to run a leaner AFR than you would prefer to avoid losing power you should try changing coils or otherwise trying to get a stronger spark.

High boost and especially auxiliary injection can benefit from more spark.