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REAL happy with tuning by 'Performance by Joe' in St. Louis.

My car's all stock, except the RPI exhaust. It's making about 276 ft lbs of torque and 260 hp, at the rear wheels. Boost peaks at about 27 lbs and tapers, as the RPM increase, to about 22. And this is the really soft automatic (with lockup) which he estimates loses maybe 35% through the drivetrain.

I picked up 6 tenths at the strip, from his last tune--done before the exhaust change and when the car was 100% stock, over 4 years ago. Overall, it's at least 1.5 seconds faster than stock. The car is running 13.1 at almost 104 mph. 60 foot times dropped to about 1.9.

I was dead even with a late model Corvette Z06 at the 1/8th mile and he only beat me by about 5 tenths.

Raced a new 2013 660hp Shelby GT500 and beat him because he couldn't get hooked up.

I'm REALLY pleased with the car. In any sort of drag race on the street, to about 1/8 mile or 80 mph, I can stay with anything. They don't start coming by 'til higher speeds.

It's amazing it's running 13.1's with a pretty low trap speed of 104. Mustangs, and similarly heavy cars, need to run about 110 to run those E.T's.

Perfect idle, zero turbo lag, instant response. The midrange is even more impressive than the overall speed. He even tuned for cruise and I seem to have picked up about 3-4 mpg.

The charge? $150 for six pulls and about 5 hours of his time (he only charged me for three). He didn't charge me enough. I'm going to send him another $50......

Stoked! Now I'm just going to leave it alone and enjoy it.

Here's the time sheets and dyno sheet:


 

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Impressive! Especially at that price :thumbs:

So does Gateway let you run without a cage or rollbar?
 

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I need this guys address. I will be taking a trip down to see him if I can't find someone here in southeast Michigan.
 

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From personal experience the only value to the dyno sheet on a GXP auto is the curve, the numbers are all wonky, you are doing much better than that the 1/4 times prove it. I would say most likely you are near 300 on HP and in the 340 range on torque.
 

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Here is my dynoed sheet from my old Gxp and I was spraying meth as well.

 

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Good numbers, however I just do not see how you can get 27lbs with the stock 2.7BAR.
 

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Discussion Starter #8
Hey. To answer a few questions. Gateway doesn't require a cage, rollbar, or racing harness on street tires. And no helmet, if you expect to run 14.0 or over. And the first day, even if you break 14.0, you can finish the day without a helmet. I was shocked to find out that if you run 14.0 or slower, you can even take a passenger! Guy last night had his girlfriend along for all his runs. And he was breaking into the 13's and it was still OK, at least for this first night. Friendly people, great atmosphere. Only $25 to race. Spectators are $10. They do 'test and tunes' on Weds and Friday nights all summer.

You can find Joe Donovan's phone number and address with a simple Google Search for 'Performance By Joe.' He's well known all over the country and one of the best known Viper tuners. He's often paid to go overseas to tune guys cars as far away as Australia and Dubai.

Regarding horsepower, he estimated I was making about 312 at the crank. But, as you say, he agrees that the absolute numbers on the dyno are for bragging rights only. He's only concerned with seeing what the numbers are when you show up, and improving on them.

Finally, regarding the boost numbers. I'm old school and the whole turbo/meth/nitrous thing is still pretty new to me. But, as I understood it from Joe, the stock turbo is pretty small. He was asking it (initially) for 30 lbs, but it just wouldn't do it at any RPM. I think he said that the blow off valve/pressure relief valve was just staying closed! No chance of overboost with this small turbo. But he got really good numbers by adding boost in the midrange (from 22 to 27). I guess at lower RPM, it's moving less air, so it's able to sustain higher boost.

Let me say that I'm very happy with the small turbo. Joe has another guy with a Kappa and he's running a much bigger turbo and intercooler, with all new piping. He's getting something in the 400 hp range, but at much higher RPM. But he has turbo lag and not as much torque at really low RPM.

I love it the way it is. There's virtually no turbo lag (as evidenced by my 60 foot numbers). It's just instantaneous. In fact, if I just give it a little stab, while accelerating in 2nd or 3rd, I can light up the tires. Of course, they're the original 6 year old F1's, but with only 5000 miles. I need to get some new summer rubber.

One thing Joe found surprising was that the transmission couldn't be programmed. At least as far as dumping the OBDII went. There was no way to change shift points, etc. Does anyone know if that's possible?
 

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Westers Garage from Canada has programmed the auto's.
Send a PM to Sly Bob he should be able to get you the info to get in contact with Westers.
 

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SuperChips Programmed my Automatic

FYI - Superchips Performance Tune, out of Sanford Florida, programmed my GXP and automatic.
 

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Good numbers, however I just do not see how you can get 27lbs with the stock 2.7BAR.
From what I've learned from a guy I work with that is a big Dodge turbo tuner, the 2.5BAR sensors are good to just over 30lbs. He told me that most tuners would rather use them as they are more precise then a 3.0bar sensor.
 

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Good numbers, however I just do not see how you can get 27lbs with the stock 2.7BAR.
From what I've learned from a guy I work with that is a big Dodge turbo tuner, the 2.5BAR sensors are good to just over 30lbs. He told me that most tuners would rather use them as they are more precise then a 3.0bar sensor.
(I assume you mean 2.7 bar, not 2.5 bar)

Yeah, not sure I believe that either. I have the data sheet for the Bosche sensor and it shows a linear measurement range up to 2.7 bar (24.7 PSI) at 4.65V output. According to the graph, it still looks linear up to 4.85V, which would be ~26 PSI, but it goes sharply non-linear after that and completely unreliable. No way it reaches 30 PSI, since that would be a voltage output that would exceed its 5V supply! In fact, the 3 bar sensor could only just reach 30 PSI before it goes fully non-linear (with its quoted max at 29.5 PSI).

It's true the 2.7 Bar sensors are slightly more precise. 3/2.7, or 1.11 times more in fact. But that doesn't seem a big deal.

Maybe your Dodge tuner was talking about different manu sensors.
 
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