The Cal-look Lounge
Welcome, Guest. Please login or register.
Did you miss your activation email?
March 29, 2024, 15:22:50 pm

Login with username, password and session length
Thank you for your support!
Search:     Advanced search
350646 Posts in 28563 Topics by 6811 Members
Latest Member: Bren
* Home This Year's European Top 20 lists All Time European Top 20 lists Search Login Register
+  The Cal-look Lounge
|-+  Cal-look/High Performance
| |-+  Pure racing
| | |-+  Doug Berg modified IDA venturi
« previous next »
Pages: [1] Print
Author Topic: Doug Berg modified IDA venturi  (Read 21450 times)
leec
Hero Member
*****
Posts: 2584


« on: November 15, 2017, 23:36:30 pm »

Hi guys,

Has anyone used these? Did you see a noticeable increase in HP/reduction in 1/4 mile ET?

They look really interesting and would love to try a set in the oval. Anyone know how to get hold of Doug?

Thanks,
Lee
Logged
Joel Mohr
Full Member
***
Posts: 184



« Reply #1 on: November 16, 2017, 01:13:41 am »

You can contact Berg directly...Alister is up to speed...
Logged

SEE YA AT THE RACES!!!
neil68
Hero Member
*****
Posts: 538



« Reply #2 on: November 16, 2017, 05:11:47 am »

This thread had a few test results:  https://www.thesamba.com/vw/forum/viewtopic.php?t=632226&start=20
Logged

Neil
Der Kleiner Rennwagens
'68 Beetle, 2332 cc, 204 WHP
12.5 seconds @ 172 KM/H (107.5 MPH)
Dynojet Test:  https://www.youtube.com/watch?v=M9B_H3eklAo
leec
Hero Member
*****
Posts: 2584


« Reply #3 on: November 16, 2017, 15:21:11 pm »

Will contact the Bergs
Logged
Rocket Ron
Hero Member
*****
Posts: 2861


It's old school for a reason


« Reply #4 on: November 16, 2017, 21:33:27 pm »

Here you go
Logged

13.12 @ 101.84

Grooving out on life

You can't polish a turd but you can roll it in glitter
leec
Hero Member
*****
Posts: 2584


« Reply #5 on: November 16, 2017, 21:55:06 pm »

Cheers Ron, need to decide on size now Smiley
Logged
Rocket Ron
Hero Member
*****
Posts: 2861


It's old school for a reason


« Reply #6 on: November 17, 2017, 08:19:49 am »

Let me know what size you want as I’m going to order some from Gary direct. We can split the postage
Logged

13.12 @ 101.84

Grooving out on life

You can't polish a turd but you can roll it in glitter
leec
Hero Member
*****
Posts: 2584


« Reply #7 on: November 17, 2017, 11:21:24 am »

Cool. That's a good idea. Will give you a call at weekend. I'm thinking the 40/44 size?
Lee
Logged
leec
Hero Member
*****
Posts: 2584


« Reply #8 on: November 19, 2017, 00:41:38 am »

Gary has emailed me back and suggested the 37/42 version.
What you going for Ron?
Lee
Logged
DaveN
Sr. Member
****
Posts: 420


« Reply #9 on: November 19, 2017, 19:09:41 pm »

Are you going to dyno it when you get them?
Logged
leec
Hero Member
*****
Posts: 2584


« Reply #10 on: November 19, 2017, 19:39:55 pm »

Was thinking a before and after, yes
Logged
henk
Hero Member
*****
Posts: 654


« Reply #11 on: November 19, 2017, 19:53:37 pm »

Also looking forward if it really makes that much of a difference.

Henk!!!
Logged
neil68
Hero Member
*****
Posts: 538



« Reply #12 on: November 23, 2017, 06:14:48 am »

More cool pictures:  https://www.flat4.co.jp/products/detail.php?product_id=10899
Logged

Neil
Der Kleiner Rennwagens
'68 Beetle, 2332 cc, 204 WHP
12.5 seconds @ 172 KM/H (107.5 MPH)
Dynojet Test:  https://www.youtube.com/watch?v=M9B_H3eklAo
henk
Hero Member
*****
Posts: 654


« Reply #13 on: November 23, 2017, 11:30:52 am »

Luckly the pictures are good because i have no idea what they are saying. Grin
And what is the idea begind these grooves,why would this make more HP?

Henk!!!
Logged
Bruce
Hero Member
*****
Posts: 1414


« Reply #14 on: November 25, 2017, 22:24:57 pm »

If you had some that were 37mm on the minor dia and 42mm on the major dia, Doug told me they have the throttle response of 37mm vents and the hp of 42s.
Dynos don't lie.
Logged
PPRMicke
Sr. Member
****
Posts: 369



WWW
« Reply #15 on: November 26, 2017, 11:21:48 am »

I do not want to be stupid
But it's not better to see what gives power
44 mm ( jpm ) can you get out 282 hp (46mm 290 hp)
/// Micke
Logged
leec
Hero Member
*****
Posts: 2584


« Reply #16 on: November 26, 2017, 14:03:21 pm »

Sorry, I'm confused what you mean?
Lee
Logged
PPRMicke
Sr. Member
****
Posts: 369



WWW
« Reply #17 on: November 26, 2017, 20:57:51 pm »

Ok Will try to explain in English with google translate
If you look down in the carburetor you'll see a fuel spreader
If you count on the total radius of the spreader then you will see where the restriction is
Gene b carburettors then you use another type of spreader to increase the flow same with modified IDA (51.5mm)
JPMs flow approximately 30% more of the same size
(If you count on the intake pulse length is a good thing to think about  )

/// Micke
Logged
henk
Hero Member
*****
Posts: 654


« Reply #18 on: December 04, 2017, 17:14:35 pm »

I tried to find some more info about these and found this.
The results of a dyno run.
With the standard venturi's and with the modified ones.

Henk!!!
Logged
leec
Hero Member
*****
Posts: 2584


« Reply #19 on: December 04, 2017, 18:06:51 pm »

20hp gain?  Shocked
Logged
chez2165
Full Member
***
Posts: 163


« Reply #20 on: December 04, 2017, 19:41:44 pm »

How much is a set and are they aimed at street or race
Logged
henk
Hero Member
*****
Posts: 654


« Reply #21 on: December 04, 2017, 19:50:53 pm »

20hp gain?  Shocked

Yep.
They said,they started with a 86X90.5(2213cc)engine that was jetted and timed and had 190bhp at 6200rpm.
Then they placed the 37/42mm modified venturi's and the bhp went up to 208bhp.
With the 40/44 modified venturi's was it 210bhp.
This was both with the fan belt on.
When they took the fan belt of it went even to 228bhp!

Henk!!!
Logged
henk
Hero Member
*****
Posts: 654


« Reply #22 on: December 04, 2017, 19:55:39 pm »

How much is a set and are they aimed at street or race

Logged
Dalland
Jr. Member
**
Posts: 60


« Reply #23 on: December 08, 2017, 10:17:49 am »

20hp gain?  Shocked

Yep.
They said,they started with a 86X90.5(2213cc)engine that was jetted and timed and had 190bhp at 6200rpm.
Then they placed the 37/42mm modified venturi's and the bhp went up to 208bhp.
With the 40/44 modified venturi's was it 210bhp.
This was both with the fan belt on.
When they took the fan belt of it went even to 228bhp!

Henk!!!

That amount of gaing without the peak power moving higher in the rpm scale when "all they did" was to replace the venturis with bigger ones.
Something seems a bit fishy.
Logged
Jim Ratto
Hero Member
*****
Posts: 7121



« Reply #24 on: December 08, 2017, 19:08:16 pm »

I was @ DKP toy drive last weekend, and the operator of the dyno that witnessed the difference the Berg venturies made, told me "You need to get a set."


in the 27 years I've run 48IDA on my car, this is the first "big" advance I've seen that claims increased power, to this degree. If you look at traditional dyno comparisons where venturi diameters are increased, the power change isn't usually substantial, unless the initial diameter was "way off" to begin with. I was always taught there was a price to pay if you went big and aimed for max HP / max RPM.
Talking to a few guys that have actually switched to Berg venturies, it seems they really do it all. A friend of mine running FK87 in street motor said it brought the power in sooner and harder and the top end picked up too.

Eventually I'll have to try a set in my street car.
Logged
Dalland
Jr. Member
**
Posts: 60


« Reply #25 on: December 08, 2017, 23:02:09 pm »

I was @ DKP toy drive last weekend, and the operator of the dyno that witnessed the difference the Berg venturies made, told me "You need to get a set."


in the 27 years I've run 48IDA on my car, this is the first "big" advance I've seen that claims increased power, to this degree. If you look at traditional dyno comparisons where venturi diameters are increased, the power change isn't usually substantial, unless the initial diameter was "way off" to begin with. I was always taught there was a price to pay if you went big and aimed for max HP / max RPM.
Talking to a few guys that have actually switched to Berg venturies, it seems they really do it all. A friend of mine running FK87 in street motor said it brought the power in sooner and harder and the top end picked up too.

Eventually I'll have to try a set in my street car.

A venturi has one function, a reduction i cross areal to boost the air speed and reduce the pressure to suck out fuel.
To make more power we need higher imep or more rpm. The imep here seems to high and the peak rpm has not changed, but the a/f probably have. But the correction factor on the dyno test has also changed and that makes the biggest difference. The only real way to get more power is to enlarge the venturi size with out getting a lower quality of atomized fuel. Like the one jpm makes.
« Last Edit: December 08, 2017, 23:04:39 pm by Dalland » Logged
Pages: [1] Print 
« previous next »
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Valid XHTML 1.0! Valid CSS!