blackbenzz

Ok so the AMG "80"mm TB has been out for a while and then Renntech now has the 82mm TB. Has anyone dyno'd the gains of either one? I think the 82mm TB can be bored out a couple more mm's to an 84. What ever happened to all the tuners talking about coming out with even bigger TB's?

jikjak

what size TB do u use in your car?
i think they are still working on their larger TB projects.

im hoping something comes out soon.

blackbenzz

Right now my throttle body is stock

MB_Forever

I'm not sure if anybody dynoed it, but BENZGal has it on her car, it she ran fantastic times at Famoso at +1700 ft DA

blackbenzz

I know she did, but her times can't be attributed just to the 82mm TB. I just want to know if going to a bigger throttle body is a worthwhile mod or if I'm only going to see like 3whp lol

chiromikey

I was told 82mm is worth 10+ over the 80mm (78) from a reputable source.

BENZGal

I agree with Mike. I should be able to post dyno increase #'s on their new airbox in the next week or so. It was built to go with the larger TB. I think a larger TB is worth it.

Max.H

I think the throttle body needs to be bigger then 82mm.

TectiteK4E55

If we apply the theory of supercharged Mustang Cobras (what I build alot of) to Mercedes it will certainly make a huge difference. On the 5.0/5.8 with forced induction going from the stock 60mm to a 65 gives you around 18 ish hp with no loss of bottom end, from a 65-70 gives you another 8-10ish with no loss of bottom end, from 70-75 another 8-10 with 4 hp loss of bottom end, then from 75-90 another 18-22 hp with a pretty good loss of bottom end (below 3000 rpm 13 hp loss). On an 03-04 Cobra, you pick up 23-25 RWHP on a bone stock motor going with an Accufab with no loss of bottom end. I have a 955 RWHP 03 Cobra with an Accufab...on the same day, I let the car cool down and dynoed the car again and lost 57 RWHP going back to the duel 57mm. It is obvious, the higher you get in the HP range, especially with Roots style blowers ( Our E55's, 03-04 Cobra, 99-04 Lightning) you have to find the sweet spot in your power range as far as bottom end HP and torque loss to higher RPM HP and torque gains, especially wth a daily driver. Another thing people rarely consider with forced induction is the diameter of the throttle body and the length of the throttle shaft. WHen the throttle snaps shut, if the shaft is too long it can bend. I have an 08 GT500 making 653 RWHP with bolt ons and stock blower and have bent two Whipple monoblade throttle bodies at the track. These are all things we have to consider during testign of anythign new....

AMGSC

I think you meant twin-screw not roots style blower in the E55s correct?

hooleyboy

couldnt you just take your throttle body to a machine shop and have them machine it down, I am a big fan of: If they dont make the parts you want make then yourself.

Vendors on this site are taking a back seat IMO, to the need of their market. Maybe with the current economy R&D might be to much of a risk. I plan on having a huge throttle body, How that gets done??? I will find away.

TectiteK4E55

By roots I mean anything on top of the motor, sorry..Mustang terms...we call Kenne Bell, Whipple, TVS, Eaton, etc, all Roots style on top of the engine. Sorry for the confusion,,,

As far as just making a throttle body from a core at a machine shop, it is a little more entailed than that. Electronics and tuning also play a huge factor. I have had several of these made out of billet aluminum, trying to improve power with no loss of bottom end, but it is alot of work..stay tuned...

blackbenzz

Cool!
Awesome thanks. I'm very interested in your data even though it will have a larger airbox as well
I have seen the 82mm throtle body. One side measure 82mm and the other is 84mm. It can at least be bored out to 84mm if not 85mm. Stay tuned
GREAT info here, thanks!
The outer wall on the stock throttle body is way too small to bore it to anything significant. My project should start today but Involves some custom fabrication and porting so it won't be a DIY


Just an interesting little bit of info. I am in the process of pulling a 03 Audi RS6 motor to change turbos and for ****s and giggles looked at the TB. It is almost identical to the 82mm TB from Mercedes except for a few small differences. I just found it interesting thats all

jikjak

wow u ran those times and are still using a 74mm?

BENZgal: cant wait to see your data as well. do u have a dynosheet using the 80mm to compare it to?

blackbenzz

Yes but not for long, car is under the knife I will have dyno reults (before/after) pending proper afr after install. My setup is different than the E55 but it will give some input on the situation.

Me too. Its technically 4mm bigger so the jump is almost like going from stock to 80mm. Knowing my luck I will lose power

MB_Forever

I can't wait.....

blackbenzz

Bad news is the shop my car is at doesn't want to risk boring the throttle body and not being able to have the flap seal properly and make the car run poorly especially at idle. They say the gains are not worth the risk and I'm jumping about 10mm already so I should see some good gains. So I am going to have to settle for a non bored tb until I find someone that can bore the TB. It can be bored to about 85mm from what I can tell.

Zod

its still a big jump! stop been greedy
and good luck