Subaru Legacy Forums

Subaru Legacy Forums (http://legacygt.com/forums/index.php)
-   Tuning (http://legacygt.com/forums/forumdisplay.php?f=84)
-   -   Cant get more than 300 wheel out of the FP68HTA (http://legacygt.com/forums/showthread.php?t=192621)

farmerz24 09-07-2012 12:05 PM

Cant get more than 300 wheel out of the FP68HTA
 
Hi Guys,


My car is a 05 LGT Manual. I have a problem i cant figure out.

My setup is the FP 68HTA. However, I am having trouble breaking 300/300 wheel on the airboy road dyno. I see similar threads like littlebluegt's thread where he was easily up above 350wheel and i also see here that ridgeracer or is also road dynoing 350 or so wheel WITHOUT METH.....

My setup is:

FP 68HTA
Process West TMIC
Invidia divided 3 inch DP catless, full 3 inch catback exhaust
TGV deletes
Deutchwerks 300lph pump, 750cc DW injectors
Airbox Lid removed with K+N filter
50/50 or 60/40 water meth injection M7 nozzle
aftermarket up pipe catless
Romraider

Now the problem is that I am able to run the same if not more timing that what littleblueGT has in his thread, say 15 degrees peaking up to like 23-25 degrees, with a indicated AFR of 12-12.5.. boost is 20psi.
However, the best logs i can do on road dyno are about 280tq and 310 whp. I am at a loss as with this much timing and that lean of AFR i should be making more power. The only thing i can think of is that i have some sort of restriction, however i doubt the stock airbox with K+N and lid removed is causing this. I also have the stock rubber inlet on the turbo could this be collapsing? I am going to get a aftermarket silicone inlet and the kstech 73mm CAI but i still dont see these as causing a restiction.
Anyone have any other ideas.

The other thing I dont have are headers. I have stock manifolds, but even so i should be pushing more power i would think.

60-80 times on road dyno are only 2.45seconds.
The engine also has fresh mahle pistons, compression and leakdown were just checked and are in spec along with new sparkplugs.

I will post logs and pictures of the graphs today after work. If anyone has any ideas let me know.

Spec B 09-07-2012 12:29 PM

Post some logs up..

Also - I assume you are using the airboy sheet correctly - wheel diameter, weight and correct gear ratio, flat road, etc.?

Try downloading Virtual dyno - it is easier to use.

Spec B 09-07-2012 12:32 PM

And on meth you can run safely more boost. I run 24 tapering to 20 on E85.

farmerz24 09-07-2012 01:00 PM

no access to e85 here.

crappy 91 + 60/40 meth.

farmerz24 09-07-2012 01:01 PM

spec b out of curiosity, what are you showing on the airboy with the 68hta.

Spec B 09-07-2012 01:02 PM

Here is my virtual Dyno..Airboy is about the same.

http://legacygt.com/forums/attachmen...8&d=1334697633

Spec B 09-07-2012 01:03 PM

I am on stock internals - so AFR is around 11.3 - I could go leaner.

farmerz24 09-07-2012 02:58 PM

what is your timing

Spec B 09-07-2012 03:01 PM

16.5 at peak tq up to 24.5 near redline...I probably have a little room to run more.

Here more info - including a log. http://legacygt.com/forums/showthrea...no-184105.html

farmerz24 09-07-2012 03:22 PM

ya something aint right if your making almost 100 more wheel.
will post logs shortly....

sbw 09-07-2012 03:28 PM

You're crazy to even be trying to do a comparison like that.

Have you checked for boost leaks?

Whats your comp ratio with this new setup?

If anything you need to take a look at how your g/s compare for starters.

To say you should be running the same amount of timing to make the same power is simply not true. Two timing curves can be completely different and make a similar peak power. You can use it as a reference but dont think thats what you need to run necessarily.

Spec B 09-07-2012 04:09 PM

Assuming a good tune, no boost leaks and healthy engine...the comp ratio is the most likely cause.

Same engine with the same turbo running the same boost, fuel afr and timing will yield similar results. The other tune pieces (like Avcs) will not account for much difference in hp.

Spec B 09-07-2012 06:00 PM

Just realized you are running a tmic..that mght be a restriction. But not 100whp worth.

need bb 09-07-2012 06:26 PM

Well you don't have E85. You are running a lot of timing for 91. I thought most people were running around 17-18 at peak RPM??

Spec B 09-07-2012 06:37 PM

He is running meth tho...basically same knock resistance as E85.


All times are GMT -6. The time now is 08:00 AM.


LegacyGT.com