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Unread 06-30-2009, 04:03 PM   #1
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Default And so it begins... SRT-4 modifications

My SRT-4 is now 3 years old, bought in May of 06. I had the standard 3 year/36,000 mile warranty and oddly enough, I hit 36,000 miles on the same day as the 3 year anniversary, just to be sure my warranty was up right? haha.

Anyways, i put traction bars/h-brace on the car the first week i owned it, never had much problems with wheel hop because of that. I installed an Aeroforce Pro scan gauge with like 30 parameters and it allows me to keep track of a ton of engine related stuff from the OBDII port.

After that, not a lot else, 75% done with factory cruise control install but still have a little work to go (had that on for 2 years without completing it silly me)

So, NOW:

Tomorrow morning I get the Stage 1 ECU installed in the car, I have to have the dealer do it or I install it at the dealership myself in order to avoid paying them the 75 bucks for the install. The car won't run after the new ECU is in until it gets a VIN flash to match the skim key, in other words it has to be installed at the dealership, which is very annoying. This will add 15 horsepower right away and allow me to add in some other goodies!!

After that, my AGP adjustable waste gate assembly goes on, which can allow up to 19 lbs of boost in conjunction with the stage 1 ECU, or 30 more horsepower roughly.

Then my full 3 inch exhaust with Mopar cat delete, for another 15 horsepower.

THEN I need to get my rear strut bar installed to tighten up the rear end and help out on tight turns and hard acceleration out of corners.

Oh, and of course my BWoody catch can, which as sat for 3 years now.

My stock dyno was 220 horses, 245 lb feet, so I'm looking to bring that up to like 280/300 or so, if things go okay.

I'm pretty excited, I waited until my warranty was up and now it's time to get serious.

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Unread 06-30-2009, 04:54 PM   #2
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Make sure to take lots of pictures.
Looks good so far, keep us updated.

Edit:

Hmm. I wasn't directly referring to your, electronic control unit install... simply asking for pictures, like the ones you've been posting.

Last edited by LMFAO; 09-10-2009 at 10:55 PM.

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Unread 06-30-2009, 07:51 PM   #3
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pictures? of an electronic control unit install??? ooooookay, I think not

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Unread 06-30-2009, 08:27 PM   #4
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I've been waiting for this!
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Unread 06-30-2009, 09:26 PM   #5
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I'm praying for good things tomorrow, the WGA and ECU are both used, I drove the car around the last couple of days, doing a little spirited driving to get one last 'stock' feel for the car, so I can have a comparison. I wish I could get the stage 3 package (365 hp on race fuel) but Mopar discontinued it so I'm stuck for now with what I've got, but that is fine, every little bit is fun

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Unread 06-30-2009, 09:52 PM   #6
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Here is my stock dyno sheet from last year, on a 99 degree day, not bad for an air to air intercooled car on that hot of a day

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Unread 07-01-2009, 02:34 PM   #7
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Okay, had a quote of 130 dollars to have the dealer install the ECU and flash it with the VIN number from my car, and I decided screw that, and showed up an hour before the dealership opened and installed the ECU myself. The service guy flashed the VIN in and it only cost me 60 bucks (still a ridiculous price for 5 minutes of work).

The following is the Mopar information that comes with the instruction install pamphlet:

Quote:
• Increased WOT and part throttle boost. To develop
additional peak power and peak torque for the Stage 1
package, the boost was increased for wide-open throttle
(WOT) conditions. The boost was also raised for part
throttle conditions to enhance the driveability.

Noticed this right away, was quite surprised at how easy it is to completely roach your tires if you are not careful. With stock ECU the computer tunes down the boost for a controlled delivery that peaks then tails off again as you approach full throttle. Now the boost is available earlier in the throttle delivery, and when you hammer down, it remains at high boost instead of tapering off.

• Improved turbo response. The Stage 1 turbo wastegate
control was retuned for better turbo response. Not only
will the Stage 1 deliver more torque and power, it will
also deliver it faster.

Noticed this in conjunction with the previous comment. Again, careful, or you roach tires fast and hard.

• More aggressive exhaust note during deceleration.
More pops, snaps, and burbles during closed throttle
decelerations and between shifts.

As i first left the dealership, it popped so loud that I thought i screwed something up. I am guessing the computer was 'learning' the engine and my driving behavior though, because it hasn't been quite that crazy since. That being said, the exhaust note is noticeably 'angrier' both slowing down and down shifting.

• Optimized calibration for the Mopar Performance Blow-Off
Valve (sold separately). The Stage 1 kit has improved the
functionality and the audible performance of the integrated
recirculation valve with the BOV conversion kit in mind.
Available July, 2003.

I am picking this up next week, litter more than a noise maker but they are fun.

The following features apply to manual transmission only:

• Boost hold feature during WOT shifts. Keep the pedal
to the metal, blip the clutch, and grab the next gear. Do
it fast enough before the redline, and your reward will
be a zero-lag, constant boost shift.

I have to be honest, I have tried this, but man it takes a total reprogramming of my brain to attempt to hold the throttle down and NOT release it at all when I push the clutch in, even if it is for just a split second. I think I got it once and chirped the tires hard going into third gear though.

• Enhanced first gear boost schedule. The maximum
boost in first gear is increased to deliver more torque
and power to the road for a higher performance launch.

Again, careful, or you will be buying two 150 dollar tires in short order.

• Soft Rev Limiter. This system uses a smooth torque
management strategy to prevent engine overspeeding
instead of the standard fuel shutoff at the rev limit.
The following feature applies to auto transmission only

I have yet to really take the car hard to the rev limiter with the new ECU, I rarely ever had that happen before, as the 6000 rev limiter was beyond the optimum shift point of 5500.
Right now, the hood is up in the garage and I am waiting for the car to cool down, then the AGP waste gate assembly gets installed, woo!!!

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Unread 07-01-2009, 06:47 PM   #8
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Quote:
Originally Posted by StreetRacingTechno View Post
Okay, had a quote of 130 dollars to have the dealer install the ECU and flash it with the VIN number from my car, and I decided screw that, and showed up an hour before the dealership opened and installed the ECU myself. The service guy flashed the VIN in and it only cost me 60 bucks (still a ridiculous price for 5 minutes of work).

The following is the Mopar information that comes with the instruction install pamphlet:



Right now, the hood is up in the garage and I am waiting for the car to cool down, then the AGP waste gate assembly gets installed, woo!!!
Nice man. I'm actually anxious to get a new PCM here soon from Intense auto-parts for my GP GT. From reading what you described under each bullet I must be underestimating what a new ECU/PCM can do.
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Unread 07-01-2009, 07:54 PM   #9
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it amkes a difference but you wont see the results SRT will it makes a major difference on turbo cars like his.
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Unread 07-01-2009, 07:57 PM   #10
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I dont blame the dealer honestly 60 bucks is a good price the scanner, network, and programs required that the dealer uses cost over 22K alone they have to recoup that investment and make a profit. You should see the new Chrysler interface out now it's the most uptodate modern diagnostic aid ever developed it will almost tell you whats wrong with the car just by plugging it in. In 8 years they won't have DTC's anymore just a cpu that can self diag these newer cars.
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