I would like to take this opportunity to share some of the data from the AEM datalogging we have done on John D'Amico's 1997 Gen 2 DIY twin turbo Viper GTS.
I recently put a little bigger turbo on the car with the new air intake system and intercooler setup.
I initially did some AEM datalogging while John D'Amico was driving to monitor the air-fuel ratios with basically the same tune the car had on it before the upgrade.
Rogue GTS, Bill, has done the datalogging this last week while I have been driving.
We basically upped the boost very incrementally and monitored the air to fuel ratios and the car still had enough fuel at almost 10 PSI where we had the boost cut set.
We were confident the car would have enough fuel to run that boost and decided to bring it to the Sound Performance dyno day yesterday and were pleased to put down 796 RWHP and 782 RWTQ on the stock fuel system stock motor, throttle bodies and heads. The only thing this car has on it is my turbo system, T&D's and a boost-a-pump and AEM.
It took about 5 pulls on the dyno to not hit the boost cut since the boost controller solenoid duty cycle was set for 10.0:1 air to fuel ratios.
The car made 735 RWHP on 10.5:1 at 8.5 PSI
When we leaned it out a smidge, it was hitting the 10 PSI boost cut almost instantly.
So, on the 6th run when the car was definitely not as cool as I would have liked, we pulled the #'s you see on the dyno graph.
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The slippery slope of modding any car often seems unavoidable.......... Just go turbos and avoid all the headaches! LOL!
It took about 5 pulls on the dyno to not hit the boost cut since the boost controller solenoid duty cycle was set for 10.0:1 air to fuel ratios.
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Good job Paolo. That's at LEAST 37 honest hp per lb of boost - so assuming the system stays the same efficiency - means a stock motor will make 1000rwhp at around 16psi.... which is dang good for a DIY setup in anyones book.
There's a few built TT motors that do not make 800rwhp at 10psi
Does this mean you can now go make some money selling kits instead of trying to perfect what is already as good as it gets? lol
My DLM car made 965 at the tires w/ 16psi. Back out the drag of the blower and you are talkin' ~1100rwhp. So the same motor as a TT instead of a SC would have made 1100. And that was pre-built-motor days...
Quite impressive to say the least. the stock fuel pump is a PITA to replace (especially on an RT) so being able to pull 800rwhp w/ a stock pump is AWESOME.
Chad, when you have a given boost controller duty cycle running 10.0:1, and you lean it out to say, 10.5 to 10.75:1, there will be more kinetic heat energy to spool the turbo harder thereby making more boost.
Since we had the boost cut set to 9.92 PSI, the leaner mixture(10.5-10.75:1) caused the boost cut. Then we just had to adjust the boost controller duty cycle downwards percentage-wise in a couple of dyno pulls before we made the final pull for 796 RWHP.
Chad, when you have a given boost controller duty cycle running 10.0:1, and you lean it out to say, 10.5 to 10.75:1, there will be more kinetic heat energy to spool the turbo harder thereby making more boost.
Since we had the boost cut set to 9.92 PSI, the leaner mixture(10.5-10.75:1) caused the boost cut. Then we just had to adjust the boost controller duty cycle downwards percentage-wise in a couple of dyno pulls before we made the final pull for 796 RWHP.
Here is a better resolution range for the dyno graph:
Technically, if one uses the stock fuel LINES and the stock fuel PUMP, that is pretty damn close to the stock fuel system.
Lines and pump are the expensive part (when replacing)...
just my .02...
JD
not really. the biggest single expense is the injectors. Then the pump, unless you run a 255 walboro. Those are less than $200. 1/2 braded line is not too expensive if you know where to look. Fittings are pricy, but minimize the connections.
Paolo-Cars running great. I am just tooling around on 10 psi boost (about 650 RWHp) I plant on jumping up next year as I have meth and only 8:1 compression pistions. My turbos still are efficent at 20 lbs boost (70%) so that is the plan next year. I am excited to see what Hp numbers I get at that level.
Paolo, that is KICKASS, congrats buddy. Not only is it impressive that you made that kind of power on the stock pump, but it's equally impressive to see how nice and efficient the curve is... Hats off to you...
Peter
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