Latest design in TB porting...
TECH Apprentice
Joined: Sep 2003
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My guess would be that due to the error in the dyno it wouldn't look like much of a difference either way. Of course I could be wrong, this is just a guess. Anyone ever test them side by side on a dyno car, everything else equal, and see a significant (>3hp) average difference?
Bo's are a super nice piece, no downside on them....
very nice!!
you guys doing 5th axis surfacing? or just doing this on a standard 3 axis?
also maybe I missed it, but are you doing the bump stop mod aswell?
I have never seen a set of cnc'd heads before in person. I have always wondered if they are surfaced like this.
you guys doing 5th axis surfacing? or just doing this on a standard 3 axis?
also maybe I missed it, but are you doing the bump stop mod aswell?
I have never seen a set of cnc'd heads before in person. I have always wondered if they are surfaced like this.
TECH Apprentice
Joined: Sep 2003
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Ha ha, I don't have the money to waste on a part when I already have one, plus dyno time and tuning for efficiency...I'll just live with the thought that they are within error of each other, until someone else has the cash to throw around and do the actual test to prove one significantly better than the other.
TECH Apprentice
Joined: Sep 2003
Posts: 380
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You sure? Not that I don't believe you or want to start an argument, just looking for the cold-hard facts on this. Got any references from official sites (not other threads in LS1tech where someone states it's 78mm). Seems a lot of people say 75mm, since the stock TB is 75mm, yet some still say 78mm. Got a reference?
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We did our testing in our Tampa facility with the enclosed climate controled dyno which we could dial in to duplicate the air every run & not only compared the CNC designs, but ran them against our hand ported TB's, (do a Google search on Pete Incaudo Porting, he is the engineer behind this) and we were surprised with the gains...so I have to disagree.
Ha ha, I don't have the money to waste on a part when I already have one, plus dyno time and tuning for efficiency...I'll just live with the thought that they are within error of each other, until someone else has the cash to throw around and do the actual test to prove one significantly better than the other.
We can add the bump stop mod.
Yes, CNC heads are left with the mill marks.
Working on them as well....but it is a ways away yet before release.
Just released...(will post picks soon) the CNC version of ported 78mm TB's. We tried several different textured patterns & found one that netted 6-8 hp & tq in the lower RPM range, something we don't expect with the stock TB's. $129 exchange......and they are the ultimate in ported stock TB's. All is done on a CNC machine so all are duplicates of our R&D ones.
Stay tuned for pics of the design....pretty cool!
Stay tuned for pics of the design....pretty cool!
I see you have a Vengance tune & ported TB....give Ron a call to ask him about our abilities in developing killer products.
Any doubt to the amount of R&D we do just takes a visit to the shop to show you what we do day in & day out.
They are referred to as 78 by most but as you can see by the pictures the blade is only 75. We don't change the bore size on the stock ones. We do make Billet 90,92,95,100mm in both cable & DBW and 105,110,115mm cable for use with the Beck sheetmetal intake.
I see you have a Vengance tune & ported TB....give Ron a call to ask him about our abilities in developing killer products.
Any doubt to the amount of R&D we do just takes a visit to the shop to show you what we do day in & day out.
I see you have a Vengance tune & ported TB....give Ron a call to ask him about our abilities in developing killer products.
Any doubt to the amount of R&D we do just takes a visit to the shop to show you what we do day in & day out.
where does this 78 misconception come from, is there a stock 78mm? All the porters I have seen dont touch the blade so there isnt an oversize, all the TB's seem to be 75's, but I am also fairly new to the LS1 community so maybe I missed something, wondering where the "myth" came from if it is a myth..
edit: also my bitch slap comment was not directed at you, it was directed at the douche that came in the thread and posted wrong info and left.
edit 2: if you know they are 75's, they should be referred to as 75's not what they are commonly referred to as, not trying to bash you but mis-information spreads like wildfire it seems compared to real info. And also that could come back to bite you since you said they are 78 and the customer recieves a 75.
Last edited by 00pooterSS; Jul 16, 2008 at 09:46 AM.
yep mine measured 75mm however the ridge in front of the blade chokes it down to around a 73mm rthus the reason for porting...im with bo i dont think theres enough material to go 78mm,,,,