I am looking into getting the bigger throttle body. What is the general consensus on whether it is a worthwhile mod or not?

Thanks,
Illini99

 

It, along with a tune it's worth it.
Also helps to throw a CAI at it before the tune,
1. 74 mm TB
2. single or dual CAI ( does not matter, dual is just for bling, single is more than needed )
3. Eurocharge tune.

 

I have to disagree in that the DCI intake showed 25 HP increase on my SRT on a mustang dyno below 3000 rpm. I designed it to increase air flow, aka lower the resistance up to the TB, and it worked, the single CAI actually had a 0ne PSIG pressure drop at the TB at WOT and 6000 rpm. One PSIG is a big deal when the atmosphere is only about 14.7 PSIG before the TB.

A larger TB assists but it can not be too big unless serious programming is done on the engine controller. Rob and I tried a PAIR of TB's on a DCI and it sorta worked but the engine would have a continuous hick-up during normal driving, ok on WOT but I could not get the computer to accept the fact that more air was available at any throttle setting.

Enjoy, only 19 days till election, finally cant wait. Woody

 

Agreed Woody, dual on a SRT6, but single is fine on an NA.

 

Would I not be correct in saying that the pressure before and after the throttle body when the car is running is below atmospheric pressure?

 

Is Eurocharge the only reputable tuner there is? Also, what kind of horsepower and torque gains can be expected fro a N/A roadster?

 

To my knowledge, no one has ever posted any VALID results from a dyno run from before and after the 3 mods.
Lots of "butt feel" info however, my butt says maybe 30 HP.
That works out to pretty expensive HP :
1. TB 50-100
2. CAI $380 ( single )
3. EC tune $600 ( stage 1 )
total @ $1000
$ per HP : @ $33
you will NOT recover this cost upon resale or trade.

 

Valk posted two dyno results, one before and one after a tune.
I have them somewhere or they can be found on this forum.
The max horsepower of a tuned NA is about 195, someone claimed over 200 but never put up the dyno sheet so we can discount that one.

 

I am assuming that is rear wheel HP ?

 

I was referring to the dyno results mentioned in my first sentence, so yes it is rear-wheel hp.
I see the NeedsWings SCAI as a bit is a waste of money on the NA. A larger two-piece Mercedes engine cover cannot be much different in airflow and it can be had for about $100 in excellent condition. I got a new one on eBay and it came with brand new filters, it had a few storage marks on it that you had to look for and the front part was in excellent shape as well. You have to be careful that you get the correct one though, others look the same but foul the hood liner. I took two to the dump until I found the correct one.
Valks dyno tune results in St Louis I believe. There is another chart from an NA that has more mods and the max hp was around 195 hp.

Here is a PDF on NA mods using a Mercedes engine cover.

After tune.


Before tune.



I think that the tune was all that was done to the car. Maybe Valk can tell what was done to the car.

 

180, it seems that you think a 2 piece Mercedes engine cover is better than the needswings intake. What car and year is the engine cover from? An R170 SLK? It seems that this is the route to go if it is cheaper and performs better.

Also, will this engine cover accept the larger throttle body?

Thanks in Advance,

Illini99

 

I do not say it is better, I just think that any extra hp gained is not worth the cost of the SCAI.
The Mercedes part number of the two pieces that make up the larger engine cover are listed in the PDF.
The SLK covers are no better than the one on the Crossfire.
The location diameters on the MAF bodies both large and small are the same, it is only the inside diameters that are different.

 

Thanks 180. I downloaded the .pdf and that pretty much tells me all I need to know. I will likely go that route.