As always your knowledge astounds me!
----- Original Message -----
From: "Bernd D. Ratsch" <bernd@texas.net>
To: <dakota-truck@buffnet.net>
Sent: Monday, July 30, 2001 00:33
Subject: RE: DML: RE: MP 4bbl throttle body ?
>
> It all depends on what you want, where you want it (power), and how
> much. A 50m or 52mm is fine for a 5.9L, more than plenty for a 5.2L,
> and will work well on V6's in certain cases. However, bigger is NOT
> always better. But yes, the Holley 52mm will perform better than a
> stock unit...if that's the comparison (removed factory TB and installed
> Holley 52mm TB).
>
> I did ask Holley to provide me with some Dyno data and they do NOT have
> any on the Dakota's. Also, when asked for a test case TB for a
> comparison against the Flometrics or Fastman 50 and 52mm
> TB...hehehehe...."No Comment" from Holley. That tells ya
> somethin'...don't it? ;)
>
> The throttle body is more than just an air delivery unit, it must be
> properly tuned to not mess with the MAP signal (too quick of a vacuum
> drop on the port) and must work with the existing manifold (factory or
> M1) and linkages.
>
> - Bernd
>
> -----Original Message-----
> From: owner-dakota-truck@buffnet.net
> [mailto:owner-dakota-truck@buffnet.net] On Behalf Of Kevin
> Sent: Sunday, July 29, 2001 1:29 AM
> To: dakota-truck@buffnet.net
> Subject: Re: DML: RE: MP 4bbl throttle body ?
>
>
> Ron, That is what I am getting at. Have you tried a 52mm on your truck?
> I am not doubting your truck runs great, but maybe if you knew a way to
> try a 52mm, it might be better, or at the least not run any worse. I
> side with Mark and Chris on this one. A Throttle body is just a air
> delivery part. It is like going from the restrictive factory intake to a
> K&N. You flow more air the truck builds more power. At some point you
> reach a saturation point where more air will not deliver more power, and
> throttle response will suffer. I was concerned when I ordered my 52mm,
> and then I heard from some of the guys that it would be too large, but
> that is not the case, and if anything my throttle response is better now
> than with the stock unit. Just trying to get as much info as possible,
> and hopefully e are all enlightened.
> ----- Original Message -----
> From: "Ronald Wong" <ron-wong@home.com>
> To: <dakota-truck@buffnet.net>
> Sent: Sunday, July 29, 2001 14:53
> Subject: RE: DML: RE: MP 4bbl throttle body ?
>
>
> > Kevin,
> >
> > Talk to Bernd. I believe I've read where people have bogged down
> somewhere
> > in their power curve with the 52mm and not with the 50mm. I run
> Flometrics
> > 50mm billet TB and have had no problems.
> >
> > Ron
> > 00 PB SLT QC 4X2 5.9 46RE 3.92 LSD
> > For modifications see my DML Profile (URL follows)
> > http://www.twistedbits.net/WWWProfile/dakota/Kw9pV1EkFeOYY
> >
> >
> > -----Original Message-----
> > From: owner-dakota-truck@buffnet.net
> > [mailto:owner-dakota-truck@buffnet.net]On Behalf Of Kevin
> > Sent: Saturday, July 28, 2001 10:50 PM
> > To: dakota-truck@buffnet.net
> > Subject: Re: DML: RE: MP 4bbl throttle body ?
> >
> >
> > Does anyone have any proof to go against this? I run a 52mm Holley
> > with modest mods, and it definitely runs better than the stock unit,
> > although I do not know if the 50 mm would have more power. Anybody
> > used both?
> > ----- Original Message -----
> > From: <chris@slowcar.net>
> > To: <dakota-truck@buffnet.net>
> > Sent: Sunday, July 29, 2001 12:36
> > Subject: Re: DML: RE: MP 4bbl throttle body ?
> >
> >
> > > | I'm sure the 4bbl TB would flow far to much air out of the box for
>
> > > | my
> > engine
> > > | size/mods, but I was thinking that I could get a restrictor plate
> > > | to
> cut
> > down
> > > | the CFM to whatever worked best.
> > >
> > >
> > > I still haven't bought the argument that you can over TB an
> engine
> > > like you can over carb one. The downsides to a to big tb would be
> > > mainly loss of throttle granularity (e.g. a 1% change with a 4bbl is
> like
> > > a 5% change with a stock 2 barrel, so you loose some of the
> "precision").
> > > It's not like a carb'd engine where vacuum over the ortifice
> > > meter's
> > fuel -
> > > that's done independently.
> > > As for the velocity argument - the airs going into a plenum -
> > > once it
> > hit's
> > > that, boom, it slows down anyway. If it were a velocity stack setup
>
> > > it
> > might
> > > be difference.
> > > I don't think the TB will help much either (at least on a stock
> > displacement
> > > engine) - pumping losses really aren't an issue (which is what the
> > > TB
> > helps) with
> > > the CFM that would be turning.
> > > I think a restrictor plate would be more trouble than it's worth
> > honestly. If
> > > you want the 4bbl just do it - you probably won't pick up any power,
>
> > > but
> > it
> > > shouldn't hurt anything. I would definitley consider the
> > > progressive
> > linkage
> > > that Brend mentioned earlier!
> > >
> > > | Any chance you could post a picture of the mod you did to the 4bbl
>
> > > | TB
> to
> > > | adapt the TV cable?
> > > | Also, what engine setup are you running (ie. year, cubes, mods,
> > > | obd 1
> or
> > 2)
> > > | In addition, what valve sizes do you recommend?
> > >
> > > I will try and get a picture of it and post it - I really just
> drilled
> > a small hole,
> > > tapped it, ran some threaded rod in it, and fixed the TV cable
> connection
> > > over it. But will try and get some pics.
> > > Old engine was a 318 with heads+Cam, M1. OBDII, but has a
> haltech
> DFI
> > > piggyback computer that handles fuel and spark. New engine is a
> solid
> > > roller 408.
> > > Valve size I would stick with a 1.625 exhaust, no reason really
> > > to go
> > bigger.
> > > On the intake I would like a bit more valve, but honestly anything
> bigger
> > than
> > > a 2.00 valve and I don't think you can do a good valve job. My head
> > porter
> > > tried first with a 2.02 and with a 5angle valve job hit water (not
> good).
> > Honestly
> > > with a good valve and valve job you aren't giving up a whole lot
> > > with
> the
> > smaller
> > > valve, and on a smaller cube motor it's definitley the way to go
> > > anyway
> > (try
> > > and keep velocity up).
> > >
> > >
> > > Chris Bennight
> > >
> > >
> > >
> >
> >
>
>
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