Hey guys! I need help!

What are some high boost proven DBW throttle body options? The most popular proven TB I can find is the Bosch 82mm. Does anyone know of 90mm or larger options that work in a boosted application? Some of the LS TBs I found in the 100mm range said max 25 PSI which is concerning.

I am just trying to do some homework instead of leaving everything up to my engine builder. Thanks.

Bigger throttle bodies are easier to blow open/not close properly under boost pressure, they need stronger return mechanisms which means a stronger motor/gearbox which is where aftermarket throttle bodies come in.

I saw that TB on the Magnus site. Been wondering how people are wiring this up to work on a DSM. I've done some searching, but so far I've only found some generic bench applications on youtube.
Anybody have any wiring info or a thread to point me in the right direction?

Anyone find anything? Might end up sticking with 82 but still curious if a 90 exists out there.

I've been looking into DBW options for lesser-powered stuff. I'm going to have a harness made soon, and I think I'm going to go with DBW for future-proofing and for the features that it makes possible (flat-shifting with or without strain guage, throttle blipping, better launch control, cruise control). The Bosch throttle body is a pain to mount to our existing intake manifolds, and the one bolt-on solution (Magnus intake with 82mm TB) is pretty excessive. The owner of a Time Attack Evo that recently won its class at WTAC (on a 82mm Bosch Motorsport throttle body) says that the 82mm was total overkill, so they went to 68mm for their 590hp car, but they thought something closer to 58-60mm would be ideal. Interesting that the suggest matching the turbo inducer size to the throttle body size. See 6:30:

The stock Ralliart/Evo X throttle body is right around 60mm, which is plenty for most setups (heck, TMZ is making his 1000+ whp through a 60mm TB). Using the inducer match theory, that 60mm throttle body is probably just fine for anything around 70 lb/min of flow. Porting is available from MIL-SPEC to bring the Evo X throttle body out to 64mm for $329, and is said to be good for around 10 whp on a decently tuned car according to that vendor. What I have noticed is that there are a few Evo 4-9s running around in the UK with Evo X throttle bodies bolted on. Conventional wisdom would tell us that since Evo 4-9 throttle bodies mount to DSM/Evo123 intake manifolds, Evo X throttle bodies would mount to DSM/Evo123 intake manifolds, as well.



DSMTuners user "nh182" has bolted on a Focus RS throttle body to his GVR4:



This swap will obviously require a standalone and wiring the 6-wire TB, plus the DBW pedal. I'll probably be using a Link G4X for the Evo 123 since it's priced very nicely, and I've asked Ohm Racing if they'd build a harness for the Evo X throttle body instead of the Bosch Motorsport throttle body, for the sake of bolting everything on. I imagine that the conversion could be done pretty easily if you can find these cars in a junkyard and can do some wiring yourself, and I understand the tuning portion doesn't take a whole lot of work. I see a lot of benefit to using DBW, even on DSMs and Evo 123s, so it's nice to have a simple setup that goes together really easily.

You have provided some great information @Canadian_CD9A !

I actually fell a bit for the "do what everyone else is doing" train and while I think that is a safe bet for most folks in most DSM mod path related circumstances, the throttle body one I think is pretty wrong. The S90 seemed to be VERY popular and as a growing DSM enthusiast way back when, that was always the goal size to have when you wanted a big boy 1000HP race car DSM throttle body. Researching is showing while nothing is wrong with it inherently for WOT drag cars, as soon as you want to decrease the flow and have better throttle response, you care more about the volume of air you are trying to flow and the lag it introduces while filling those large pipes.

I researched the heck out of intercooler piping sizing, HP "ratings" using mach air speeds at various sizes, both on these forums and off. Some really great stuff to be had with a little more searching, and after talking with @twicks69 (who can both help and sell you parts for more than just transmissions when he isn't slammed), I was convinced the 82 Bosch DBW TB will support 1000HP goal I have still while providing precise control of air in the corners at partial throttle. I will admit I am still on the fence between wanting a 3 inch and 2.5 UICP, but with a Throttle Body at 82mm (3.2"), I will not be bottle necking there.

As just extra info, I also got o-ringed Wiggins style adapters from Hypertune so that I won't have to worry about boost leaks with this setup. It should be pretty neat looking once it's all together.

As outlined above in the previous post by Canadian_CD9A, DBW just offers so much in the way of benefits for even a DD, it's already becoming rare to see a throttle cable in an engine bay of a vehicle manufactured in the last 5-10 years. Hopefully as the trend moves into more modified DSMs we'll have more information on more options that are easy to setup for more folks.

David from trackformula does the DBW conversions here in the UK. Perhaps he could assist more on this? He already does the later evos but have not seen anything for the earlys but its likely due to the age and tech is not there.

There are pedal adapter kits for the Evo 4-9, but really this can all be done with solutions we already have. Ohm Racing confirmed to me that they would be willing to make a wiring harness for the Evo X throttle body, so it's literally just a matter of adapting the pedal with some ingenuity and then tuning.

FWIW, I found this floating around online as possible "upgrades" to the 60mm Evo X throttle body, if need be. These should be direct-fit and cost pennies at the junkyard:

2003–present Mitsubishi Pajero (aka Montero/Shogun) (63mm)
2004–present Mitsubishi Endeavor (63mm)
2004–2009 Mitsubishi Galant Ralliart (65mm)
2006–present Mitsubishi Eclipse GT (65mm)
2005–2008 Mitsubishi 380 (63mm)

On the subject of intercooler piping to match, some older Buschur testing shows that if there are any gains from going from 2.5" piping to 3.0" piping on an Evo at the 640whp level (note that Buschur's dyno reads lower than many others), those gains are negligible: https://www.evolutionm.net/forums/e...89-another-day-dyno-testing-buschur-s-rs.html

Quoting one member on EvoM: "We made over 700whp on a DSM with full 2.5" IC piping and a bone stock TB."

Another: "701whp going to a 75mm TB, 5" IC, and 3" piping was worth 9whp. I have the same combo as the aforementioned car (basically) and with 2.5" pipes, STOCK throttle body, 4" intercooler, made 794."

Of course intake manifold is a variable here, but the fact remains that testing doesn't show a bottle neck on setups capable of 600-700 whp. Since 2.5" is 63.5mm, I would think that making the entire system 2.5" with a 63mm throttle body and intake ported to match, would be enough for just about everyone on DSM Tuners while giving up nothing for power compared to 3" piping and big throttle body. Even for time attack guys, how many DSMs/Evos race at 700+ whp? That's basically an EFR8474 at full blast; I think I'd take the improved spool over the power difference anyway.