Guys:
My mods are in my sig. below. I've been reading up on the MMS, MTI, and Thunder Racing's ported throttle bodies. MTI states that their TB will flow another 100 cfm over stock and that it's possible to see another 7 to 10 rwhp from their unit.
Right now I'm pulling 316 to the rear wheels and my question is: would I potentially gain any power with a "ported" TB and basically a stock motor?? I do plan on doing a cam and LT's next year but I'm wondering if it's worth it now or not. Your insight would be greatly appreciated!

Thanks,
Trent

 

A couple HP w/o headers and maybe 5 - 7 with headers and a high flowing exhaust.

 

Thanks Ragtop. Surely, there are others out there who have a ported TB on an otherwise "mildly" modded LS1. Let me hear from you guys.

 

Have wondered the same question myself a few times. Anyone else? <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

I haven't seen anyone get more than 3rwhp on a stock engined car yet. Seen about 6 cars dyno with them.

BUT... every pony counts.

I judge things based on the The McRat Constant:

Mods should gain 1rwhp for every 40 dollars spent. This is based on the average price of mods for these cars and their output.

 

my friend jason (wnaply) on here has a 2000 SS with the MTI throttle body and he dyno'd 7 to 8 across the entire powerband with lid, open borla, and FLP's with the OYP tubes on. another good thing is that the BBK or another one costs way too much when you can get one ported for a $100.

i would like to see a dyno between the ported ones and the aftermarket ones like BBK and so on.

 

I believe the port and polished throttle body is worth it. The one you choose is personal preference. I have a H/C car and my gains should be significant. I am going to try the Mark Spanner S2 out of Dallas Texas--Heard good reports. However, I have no verifiable evidence yet. Results will be forthcoming. Happy selecting.

 

Shaner is currently on a 6-9 month delivery schedule. I wouldn't plan on getting updates either while you wait...

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by McRat:
<strong>I haven't seen anyone get more than 3rwhp on a stock engined car yet. Seen about 6 cars dyno with them.

BUT... every pony counts.

I judge things based on the The McRat Constant:

Mods should gain 1rwhp for every 40 dollars spent. This is based on the average price of mods for these cars and their output.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I agree with McRat...because I gain exactly 3 rwhp and 5 rwtq with the Lingenfelter ported TB on my bolt on car. With a cam or header, or heads and cam I'm sure the ported TB would be worth more...

My LPE ported TB cost $80, or $27 per rwhp so it was worth it to me and McRat would agree I think. LPE may have raised the price to $120 last I heard...

<small>[ May 20, 2002, 10:04 PM: Message edited by: 99 Black Bird T/A ]</small>

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by OBSSSD:
<strong>Shaner is currently on a 6-9 month delivery schedule. I wouldn't plan on getting updates either while you wait...</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">heheh took me 7 days including shipping but I sent him the one off my car to Port <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

 

This may be a dumb question, but why would the ported throttle body help so much with the same size butterfly valve? I don't see how the throttle body could be a restriction, and even if it was, wouldn't you need to enlarge the butterfly valve to really get more air in there?

 

Hey guys, I appreciate all the responses. From what I've read and heard the ported TB sounds better suited for heads/cam cars. Even though camming is in my future I just wanted to get your opinions.

Thanks fellas!

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by akw408:
<strong>This may be a dumb question, but why would the ported throttle body help so much with the same size butterfly valve? I don't see how the throttle body could be a restriction, and even if it was, wouldn't you need to enlarge the butterfly valve to really get more air in there?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Well, apply the same principal as supercharging. The butterfly (TB blade) is still the same size but the added air pressure will still give you gobs more power. Same thing with a ported TB only on a smaller level obviously.

I don’t have a ported TB yet. I know I should get one, but I’ve got my TB hole just right for no idle surging with the cam, and I’ve got the blade opening just right to be 90 degrees, so I don’t want to start over on all that. Yes, I’m lazy! <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

<small>[ May 21, 2002, 08:55 AM: Message edited by: RPM WS6 ]</small>

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by akw408:
<strong>This may be a dumb question, but why would the ported throttle body help so much with the same size butterfly valve? I don't see how the throttle body could be a restriction, and even if it was, wouldn't you need to enlarge the butterfly valve to really get more air in there?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">You are dealing with a series of restrictions.
Each one you remove lessens the total airflow
resistance. I measured (crudely) the pressure
drop through a stock screened MAF and it was
substantial - on the same order as the stock
airbox+filter. I did not have a descreened /
ported MAF to compare. But the measurement
puts the upper end of -airflow- based improvement
on the same order as the lid+K&N mod. There is
also the improvement (or degradation) which
comes from altering the -sensing- of airflow
and affecting mixture. I believe the "screen"
(which in my MAF is really a metal honeycomb
with some thickness to it) does two things:
it is an airflow straightener, and its
restriction biases airflow evenly across the
orifice and sense resistors - at least at
higher flows.

I believe the undesirable mixture deviations
seen by some who try this mod are due to a new
imbalance in airflow across the MAF orifice. The
bends in the inlet tubing appear prone to bias
airflow toward the top of the MAF, to my eye.
The MAF accuracy depends on a certain assumption
of airflow distribution between that sensed by
the resistors, and the rest of the orifice.
The stock unit's characteristics are embodied
in the stock programming.

In my opinion, there is likely a benefit to be
had from making a low restriction airflow
equalizer which would correct this bias -
a very few, wider-spaced vanes forward of the
MAF, or built into the fore end, canted for best
mixture metering result. Trial and error....

 

What "The Alchemist" says is interesting. I agree, it would seem rare to have gained that much power but I don't doubt it. Does anyone else have any hardcore information regarding the use of a ported TB on a "mildly" bolt-on car??

 

Joe has tested his throttle bodies on other cars with very similar results. He has literally dyno'd the car with a stock TB, swapped it with his ported TB and pulled the car again 20 minutes later with similar gains. The results are also track proven as well. I saw him run a stock one for two passes, swap it with a ported one in the staging lanes and proceed to drop .1 and gain 1mph on two more back to back passes.

These gains would fall right in line with a solid 10hp gain.

Drop Joe an email or call and he can tell you about them.

 

A buddy of mine on this board (Spazeak) tested a JPR ported throttle body on his 100% box stock (right down to the original air box and paper filter) '01 ws6. I beleive he saw a 11hp gain across the board from it. This was done on back to back dynos, the same day, just ten minutes apart.

He added an air lid and gained an additional 14hp I beleive.

Needless to say, the ported TB stayed on his car that day, he bought the ported throttle body then and there from Joe Prince.

<small>[ May 22, 2002, 12:53 PM: Message edited by: The Alchemist ]</small>

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by The Alchemist:
<strong>A buddy of mine on this board (Spazeak) tested a JPR ported throttle body on his 100% box stock (right down to the original air box and paper filter) '01 ws6. I beleive he saw a 11hp gain across the board from it. This was done on back to back dynos, the same day, just ten minutes apart.

He added an air lid and gained an additional 14hp I beleive.

Needless to say, the ported TB stayed on his car that day, he bought the ported throttle body then and there from Joe Prince.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">While I’m not disputing these gains, this is NOT the norm. Usually stock cars see little to no improvement over stock with ported TBs.