no, none of the Nissan ones work, and I think the DBW V8 ones are the same size as ours (I had ordered one in a few months ago to test, and it measured the same)

 

I'll be waiting to see the results. Theres no way I'm buying blindly into a $1200 plenum without knowing its potential. Also, looking at the ProEFI. It would be great to be able to do a mod like this and not have to retune.

 

I could have swore that one or two guys have run larger nissan TB's before with no issue. It could be Aceman or JT... I'd have to search. The only problem is finding a plenum or manifold that would actually make use of it.

 

It seems like there isn't enough meat on a stock manifold to bore out the neck to match a larger throttle body. I was hoping the Cosworth manifold would support a larger throttle body, but from the pics it doesn't look like there is a whole lot of metal there either.

I'm no intake manifold expert, but I have a done a fair amount of research, while deciding what to do for my swaps manifold, & it seems like the VQ could use a throttle body with an additional 10mm diameter. At one point I was considering making a custom manifold with a 90mm Q45 T-body (cable throttle for my 510) & right now I'm undecided but considering the Cosworth it it proves to have the type of gains I'm looking for.

 

I actually noticed that in person. The Cosworth manifold had very little meat on the walls of the neck of the manifold, so no major porting.

 

had it worked I would have just made a new neck myself..but it was the same diameter as what we already have so I returned it

I think those guys are running larger MAF housings, and maybe the ported throttle bodies, with the enlarged flapper but not a full tilt 'big' throttle body

 

Doesnt look stock

 

guess not then lol one of the guys at Injected had told me it was...oh well

ok so there are guys making 700+ whp with a stock throttle body

would certainly be interesting to see what a big one can do on a big dog FI car

 

It still looks like the intake tract tapers down to the neck of the manifold. I wish there was a way to take it all the way down to the main chamber of the manifold itself. Anyone wanna chop off the neck of the cosworth manifold and weld on a new 3"+ one?

 

You could build up the area outside the plenum neck with aluminum and then port through the original plenum outside wall into the new aluminum buildup. This would involve welding on a nice shiny new expensive manifold... and the weld buildup might not look pretty, but if you are racing...

We used to do something similar with cylinder heads.

 

if people are suddenly so concerned about top end power and willing to lose low/mid range power, why don't they just get some 280+ profile cams?

just saying, if that was their goal all along

but yeah i know it's more expensive, but cams are proven at least

 

Cams are not the only thing thats holding the VQ back for top end power.

 

yeah I know, but these guys with 700+whp are running cams that are optimized for midrange power...seems kinda strange that suddenly now they want top end power and are willing to lose the midrange.

Actually, I totally understand why they'd want to do that, but why didn't they get a more aggressive cam in the first place?

 

Love your sig!

 

So has any non-tester/non-vendor bought and received a cosworth plenum yet (regular customer purchase?)

 

where are they giving up significant amounts of mid range power? As for trading a bit of mid for top end, certainly alot easier, and less expensive to do that with a manifold vs doing cams, which requires alot more than just "280" cams. And keep in mind still, that the charts shown so far I think all are at stock redlines.

 

no vendor has them yet for sale....dealers should be seeing their first shipments middle to end of next week

 

looks like power is being given up between 2500-5300 rpms from the looks of this chart

 

I agree, but then you gotta factor in the things you've already mentioned about what people intend on using this Cosworth for... high boost applications where they probably won't be running through gears in their high-rev VQ motor anywhere below 4-4.5k rpm?

 

oh I know, that's my point

for the guys who knew they were going for big 700+whp, why in the hell did they choose JWT or GTM's "mild turbo" cams? and not something more extreme in the first place. I guess they had to experience first hand having 5th or 6th gear be worthless at mid rpms at full boost to realize they don't need that midrange power after all?

They all knew the power level and redline they were shooting for and it makes me wonder why they didn't think things through more?