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Old 07-02-2009, 07:10 PM   #1
5lugfish
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Default FP68HTA 256/215 mustang

Open source tune on Mustang Dyno. 256 awhp/215 awtq. Tuner said he couldn't run boost over 18psi without knock.

Does this sound right?

'04 WRX Wagon 5MT PSM

PnP'd FP68HTA
800cc injectors
Walbro 255 fuel pump
JE Pistons
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Stock airbox
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Last edited by 5lugfish; 07-06-2009 at 07:25 PM.
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Old 07-02-2009, 07:12 PM   #2
ramair18954
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Very low even on a mustang. Your cammed as well. should be making a lot more power. Who is your tuner?
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Old 07-02-2009, 07:39 PM   #3
Equilibrium Tuning
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That looks extremely unhealthy. Look for leaks, do a compression test, try a different tuner.

-- Ed
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Old 07-02-2009, 08:02 PM   #4
5lugfish
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Quote:
Originally Posted by Vaus View Post
That looks extremely unhealthy. Look for leaks, do a compression test, try a different tuner.

-- Ed
That's what I thought. Compression is good. No vacuum leaks.
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Old 07-02-2009, 09:27 PM   #5
penusai
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weird.

just wondering, howcome still on the stock airbox?

maybe a stock turbo... but i think this is just a restriction on this turbo.

even though you apparently have a more serious problem.
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Old 07-02-2009, 09:29 PM   #6
5lugfish
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Quote:
Originally Posted by penusai View Post
weird.

just wondering, howcome still on the stock airbox?

maybe a stock turbo stock airbox... but i think this is just a restriction on this turbo.
Good question. Same reason I'm still using a stock location turbo. I'm waiting to do a 6 spd swap before I add any real power.
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Old 07-02-2009, 09:49 PM   #7
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2.5 block or 2.0?
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Old 07-02-2009, 09:51 PM   #8
5lugfish
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Quote:
Originally Posted by crashtke View Post
2.5 block or 2.0?
2.0 rebuilt
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Old 07-02-2009, 10:00 PM   #9
crashtke
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Only thing I can possibly think is maybe the knock sensor is doing weird things and getting false knock from the built motor. I have seen it before on 2.5 liter built blocks.
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Old 07-02-2009, 10:03 PM   #10
5lugfish
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I had the PS pump disconnected and ran a shorter belt to the alternator. Would that cause false knock?
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Old 07-02-2009, 10:10 PM   #11
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to me it looks like your tuner didnt know how to tune your boost, that is a horrible boost plot.

looks like he has your target boost too low until about 5800rpm. Every time the boost peaks then valleys is a sign that you're over target and the turbo dynamics are reducing the wgdc. Then you get low, then the TD's increase the wgdc, over and over.

unless the wg is too small on these turbos and its boost creepin, but i dont think anyone else has reported that.

I really cant believe a tuner would even print that dyno sheet out and give it to you.

I wouldnt let anyone see that if it was a final tune. When you have 40 ft*lb tq spikes ur tune sucks.

Post up your target boost, wgdc and turbo dynamics values. I bet he didnt change your td table and u bet your target boost table loooks really weird.
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Old 07-02-2009, 10:14 PM   #12
5lugfish
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To be fair, they're 30 ft/lb spikes. It's those crazy fluctuations that bother me more than anything. I would just like to know if this is a tune problem or mechanical problem.
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Old 07-02-2009, 10:17 PM   #13
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Quote:
Originally Posted by Phatron View Post
Post up your target boost, wgdc and turbo dynamics values. I bet he didnt change your td table and u bet your target boost table loooks really weird.
All I got was the hp/tq/boost graph. So... you think the TD is the problem? Would that be the culprit for the knocking too?
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Old 07-02-2009, 10:18 PM   #14
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if you email me your rom i can post the tables. r-j-w@rocketmail.com

i assume you have a tactrix cable, ecuflash and a laptop?
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Old 07-02-2009, 10:21 PM   #15
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Nope. Just the dynotune.
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Old 07-02-2009, 10:24 PM   #16
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Go here. Download romraider, ecuflash and go buy a tactrix cable for $70. The tactrix cable allow you to plug into the obd2 port and download your rom off the ecu....and even reflash the ecu. Ecuflash is the program that does the saving and flashing. Romraider allows you to log pulls on the street. If you are running opensource you should definately have all these things.

RomRaider/Ecuflash getting started FAQ
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Old 07-02-2009, 10:26 PM   #17
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I would- but I need a laptop. Mine is locked by the company I work for so I can't install software or run any type of outside hardware.
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Old 07-02-2009, 10:27 PM   #18
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Default false knock is a pita

i have an 04 i have had everytune on my motor stage 1 stage 2 vf39,16g 18g.my 04 would not take timing advance at all.my tuner was able to make boost easily but when we added timing it would knock or vise versa.fueling was dead on.now im stage 2 with conservative timing and a small shot of nitrous.i dont know what the deal is with my motor.sounds like your having similar issues.ive leaned to expect grief from my track times before the nitrous.if you work out your issues please pm me and let me know what it is.you may reach me before i kill this pos motor and rebuilt another one with forged internals to handle more nitrous.thanks
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Old 07-02-2009, 10:30 PM   #19
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Well, i since the tuner didnt know how to tune the boost....its not unreasonable to assume that he probably did a crap job on the timing too.

There really isnt a good way he could've tuned the timing very well with the boost/torque/load jumping around like that.

It really disgusts me that "pro" tuners can get away with tuning like that and stay in business.
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Old 07-02-2009, 11:43 PM   #20
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download the program and buy the cable that ron's talking about ftw OP
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Old 07-02-2009, 11:44 PM   #21
5lugfish
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I plan on it. Just wanted a tune to get me by for a while. Anyone got a cheap laptop?
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Old 07-02-2009, 11:49 PM   #22
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acer 8.9" $240

Intel Atom N270 1GB RAM 120GB HDD Webcam 802.11BG Wireless 2.19lbs Windows XP

http://www.frys.com/product/5720742?...H:MAIN_RSLT_PG
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Old 07-02-2009, 11:56 PM   #23
5lugfish
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Thanks, Ron!
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Old 07-03-2009, 03:09 PM   #24
crashtke
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Quote:
Originally Posted by Phatron View Post
Well, i since the tuner didnt know how to tune the boost....its not unreasonable to assume that he probably did a crap job on the timing too.

There really isnt a good way he could've tuned the timing very well with the boost/torque/load jumping around like that.

It really disgusts me that "pro" tuners can get away with tuning like that and stay in business.
The dyno sheet was so small I did not notice that the yellowish line was boost. Good call.
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Old 07-03-2009, 06:25 PM   #25
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Sounds to me like a garbage turbo (big suprise, an FP turbo underperforms..)

for a turbo that is supposed to make "20G numbers" that thing isnt even making 16G numbers.
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