murf stage 3+ upgrade (long)
Rocket Pilot
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From: gettysburg pa.
Jim, we have had correspondence in the past and yet again I must say I am amazed. Please tell me how your set-up differs from my stage one. I am pushing close to 8psi from a 3.3 pulley but no intercooler yet. I have it fueled heavily and have a WB to avoid a Kaboom. Results are a big black cloud at WOT. I am told there are chips to solve this issue now. The car is stupid quick right now but she is burning dirty as hell. So is it an intercooler ,chips and what else is making all that insane power for you Jim?
Kevin
Kevin
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From: Long Island and Lake George, NY
Jim, we have had correspondence in the past and yet again I must say I am amazed. Please tell me how your set-up differs from my stage one. I am pushing close to 8psi from a 3.3 pulley but no intercooler yet. I have it fueled heavily and have a WB to avoid a Kaboom. Results are a big black cloud at WOT. I am told there are chips to solve this issue now. The car is stupid quick right now but she is burning dirty as hell. So is it an intercooler ,chips and what else is making all that insane power for you Jim?
Kevin
Kevin
If you are that rich, you are not making optimum power. Datalogging with a WBO2 sensor will show where you are, I'm using a LMA-3 aux box for boost, rpm, injector duty cycle, fuel pressure, and A/F wide band. The A/F ratio being right makes a huge difference, and with the timing optomized you can safely get out of the overly rich zone to make some big power.
As far as chips, timing is pulled back to eliminate knock and the car retarding timing under WOT loads. The knock and hall sensors are relatively new and functioning well. The timing is definitely another key to the formula here.
As far as differences between our setups, I have a GT with higher compression ratio, different cams, and a port matched intake compared to a S4.
SC kit wise, I have a different (larger) airbox feeding the SC with larger intake tubing and a larger filter. More boost even with the loss through the intercooler (11 psi manifold on that dyno session). Fresh MAF with some custom Murf magic. I have the intercooler, huge difference as boost goes up. Bosch 044 pump and heavy gauge wiring/relay setup. 42# injectors and stock FPR. A bunch of hours on the road and dyno with the Sharktuner at the hands of Tim and Z. That's all I can remember right now.....more than a few differences, the setup has definitely evolved over the last few years.
Exhaust, I have a Lomas x-pipe with cats running through the stock resonators and a rmb. Nothing crazy there.
I think it is just a combination of GT's responding well to boost (cams and compression?) and a well tuned complete package. I did not expect it to make this much power, it has exceeded my goals already.
A few more tweaks are coming, and an early spring tuning and dyno session is coming. There is a video out there somewhere of the last dyno pulls, I'll do that again this spring.
Jim
Rocket Pilot
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From: gettysburg pa.
Thats good info, now if I could get my hands on a sharktuner-or at least a set of chips. I am trying to figure out the intercooler in my head right now. The difference between the s4 and gt aren't huge factors though. I have the squirter block and that is a plus for boost much the same as the turbo Supras came with. I am running fat right now to avoid a failure as well as staying off redline, but it is time to get it right. I know about that magic in the Maf deal as Tim explained it to me one night via phone. I need to talk to Tim to find out exactly what I need to get/do. Jim, congrats on that incredible machine of yours, and I am right behind you buddy!
Kevin
Kevin
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From: Up Nort
It will take you 14 hours to get here. Time to start making a dyno day schedule for 2008.
To quote somebody else
To quote somebody else
You multiply the pressure ratio by the stock horsepower, so the higher the boost, the bigger the difference gets. Stock 270rwhp with an S4 and a 300rwhp with a GT is 30rwhp difference. Boost to double that makes it 540rwhp and 600rwhp, for a 60rwhp difference. Go to 60psi and it's 1,350rwhp and 1,500rwhp, for a difference of 150rwhp
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From: theporscheconnection.com
the squirters you mention are good for durability sake, but that dosent add any power, they just cool the pistons which on a boosted engine is definately a good thing, but thats not going to get you anymore power.
The differences between S4 and GT engines are greater then the factory claim of only 10hp. (at least according to many dyno sessions that ive read about)
The differences between S4 and GT engines are greater then the factory claim of only 10hp. (at least according to many dyno sessions that ive read about)
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From: theporscheconnection.com
Kevin,
I would think a session with the shark tuner and nothing more would really pay huge dividends for your car. You probably have more then a few HP laying there on the table and it would no doubt get the car running much better and not so fat.
I would think a session with the shark tuner and nothing more would really pay huge dividends for your car. You probably have more then a few HP laying there on the table and it would no doubt get the car running much better and not so fat.
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From: Up Nort
thanks - that hurt coming out of my nose
