Spoke to John (951-296-1771 ext. 206) at BBK Performance today. Sounds like they are in the final stages of testing and the new throttle body could be available in about a month. Preliminary dyno tests on a stock vehicle are said to yield gains of about 10 RWHP. Should be a simple bolt on procedure with no additional tuning required. No guesstimated cost from BBK at this time but RPM Outlet is already advertising the product for $299.95 even though it isn't available yet.

http://www.rpmoutlet.com/05gtbbk.htm

 

Todd, I thought they were bringing out a 75mm for the '05. At any rate, this one I'll be sure to let somebody else see the 10rwhp, before I try it.

 

 

As soon as it comes out, I will get it. i will give you guys an update on the performance, etc.

-Bryan

 

Todd , as you know a larger throttle body is going to allow more air to flow. Everything I've done to increase air flow , such as the CAI & CM Plates , has required re-flashing the computer to handle it. How is replacing the throttle body with a larger one not going to require a tune :scratch:

 

It will.. :bang:

 

RPM outlet has had that on their site for a while now.

Not that I don't appreciate all the go fast stuff that is out, or coming out, but they sure are going to make it difficult to keep up with tunes. I don't foresee Diablo or SCT having multiple tunes available for download to cover each part, and each combination of parts. Sure would be cool though if someone in the business would put up a web page that gave suggestions. Maybe something like start with tune X for this CAI setup. Then if you add part Y, increase WOT by .5%. If you add part Z increast MAF curve by 1%, etc. Yea sure, you need to dyno to tweak. I completely agree before anyone starts on that band wagon. But heading to a dyno for a custom tune with every single part is going to start getting expensive. Example, the place I go to, $50 for 3 pulls. Cheap enough. BUT.....if the tuning guy makes ANY type of change to your tune, the price goes to $300. And that is if he does something as simple as change the WOT percentage. I don't even want to think what it would cost for them to actually sit down and work on tuning the car for a couple of hours. BUT, by the same right, I can go there and do a pull, then he has no issue letting me tweak my own tune with my Predator, and doing another pull to test the results. So if we had a descent idea of what parts merrited what changes, we could get the car in the ball park, then go do a dyno pull, look at the results, and make the finalization of the tuning alot more economical.

 

On that thought, is there a way to see the written code for a diablo tune. If so, someone that has similar mods can post what their written code is. Then we can do the rough adjustments to keep things going until we can get to a dyno shop for a final tune.

 

Yeah I'd like to know the same thing! I have just a bit of lag on throttle tip in and would like to get rid of it. The canned Diablo 93 octane tune didn't have it, and if I could stare/compare the two tunes side by side I could see where the differences are.

 

Look forward to your report. Dyno tuning here is now $200 per hour.

Paul

 

What size is the OEM throttle body?

 

If it's a Twin 62mm wouldn't that be bigger than the 75mm?

 

Steve I will be at DiabloSport next week - just installed Steeda underdrive pulleys, charge motion delete plates and FRPP shorty headers. Still chasing that elusive 300RWHP with my automatic without nitrous or any type of supercharger. I will ask Scott when I see him.

 

Unfortunately I think it's just the nature of this car. The ECU is so sensitive that any changes you do which effects the air flow will require a tune. I've never had a car dynoed or tuned but I don't like the idea of having to spend an additional $300.00 to get it tuned every time I add a new part. To save myself some money I'm going to buy my parts in stages, ie CAI and BBK's throttle body together and then JBA's long tube headers and catted H pipe, and then go get it dynoed and tuned instead of after each individual part. This way I get the car tuned 2 times instead of 4 times.

Your idea of posting the settings for different combo's of parts is a good one. It would require a better knowledge of the Preditor's code though. I'll have to check the manual on the one I had for my 03 Cobra and see if there is a way you can save the tune on your pc and open the file to read the settings.

 

Because the TB is downstream from the MAF sensor, should not the MAF sensor compensate for the extra airflow? Or is this car just too sensitive for that?

Most of the CAI systems change the MAF housing, requiring a tune. The CM plates eliminate an important part of the computers control, so the computer needs to know that they are gone, and the airflow will be different at certain rpms.

So . . . I conclude the TB will not require a tune, or if it does, it will be a very easy fix. I'm going to stick by that until Bryan has his.

 

I believe it is 55mm.

 

75mm Throttle body area is approx. 4417mm squared

62mm Throttle body area is approx. 3019mm squared

Twin 62mm Throttle body combined area is apprx 6038mm squared

So Twin 62mm > 75mm

 

The OEM TB has a twin 57mm inlet.

 

stock throttle body = 5102

Stock better than 75mm

 

I don't see how the larger TB will make the power. I remember reading a 80mm TBs can handle 400 rwhp. The stock setup will out flow that. I don't think the weak link for 05 is the TB. More flow doesn't automatically mean more power.