Garage Storage Organization and Garage Cabinets

twitch27 · **Dual wastgates?**

I was looking through a couple of my magazines and noticed that some of the cars had duel wastgates. what would be the point of that?

afsautoworx · 12-01-2005, 01:28 PM

Never seen that.....do u mean dual diapghram wastegates? Is it a twin turbo car?

GLHandGTS · 12-01-2005, 02:03 PM

Quote:

Originally Posted by twitch27

I was looking through a couple of my magazines and noticed that some of the cars had duel wastgates. what would be the point of that?

Yes, for engines that flow extreme amounts of air and at very hot temperatures it becomes a lot harder to control boost dependent upon the size of the exhaust housing.

Lots of big time import guys will run dual TiAL 38 mm externals or even larger duals just to make sure they do not spike/creep boost.

Aaron Miller

twitch27 · 12-01-2005, 05:17 PM

ok thanks.

mfpmax · 12-01-2005, 10:52 PM

Goto a big race and you'll see sub 8 second cars running more than one wastegate.

Ondonti · 12-02-2005, 04:18 AM

Quote:

Originally Posted by GLHandGTS

Yes, for engines that flow extreme amounts of air and at very hot temperatures it becomes a lot harder to control boost dependent upon the size of the exhaust housing.

Lots of big time import guys will run dual TiAL 38 mm externals or even larger duals just to make sure they do not spike/creep boost.

Aaron Miller

A lot of them have HORRIBLE wastegate placement, and they create their own problem. Thats why most of them need 2 wastegates.

With a big turbo it shouldnt be such a problem.

sloshadow90 · 12-02-2005, 01:50 PM

the ams evo has it now, it was posted on one of the sites that im on...

http://www.ccdsm.net/forums/showthre...light=sporting

sloshadow90 · 12-02-2005, 01:58 PM

i think u guys would need to sign in to see that site, so heres a uploaded pic of it

mfpmax · 12-02-2005, 05:45 PM

There is a thread on the SRTforums with the same pics I think. Don't have a link handy though.

As for a big turbo not needing it. On a Pro 5.0 car at the stage beams I'd say you'd need as precise boost control as you can since staging duals can play havoc on the boost build up.

Ondonti · 12-02-2005, 06:36 PM

Quote:

Originally Posted by sloshadow90

i think u guys would need to sign in to see that site, so heres a uploaded pic of it

You can clearly see that the AMS evo has horrible wastegate placement, thus 2 wastegates are needed to keep boost steady.

sloshadow90 · 12-02-2005, 06:56 PM

yea before this setup they were just running a stock exhaust manifold that was ported i beleive so it flowed nicely through the cylinder to the wastegate, but now they strapped the tub. mani. a larger turbo, and dual i think those are 38s

Ondonti · 12-02-2005, 07:23 PM

yeah those are purple top 38's Cost like 10 bucks more for the ricer touch.

If they had room for a better wastegate placement they could probably get away with 1 wastegate.

Still, I have seen honda's that make a lot more power getting away with the same wastegate placement and only a tial 38.

Im assuming thats not the gt42 evo either, since the turbo is way to small. Just a 450 hp evo

sloshadow90 · 12-02-2005, 07:50 PM

it is the gt42r... theres an arguement on a forum now, it raced a cobra and beat it then it raced an older camaro like a 68 with a 412ci. and a 300 shot of nitrous, everyone is saying shit about the camaro, its on srvidz.com they are all saying rematch, the evo had a gt35r on before and now comes back with the 42r tubular manifold and twin wastegates, not to mention it was running a 55 shot of nitrous too

mfpmax · 12-02-2005, 08:11 PM

Yeah the AMS EVO is the talk of pretty much any forum these days.

GLHandGTS · 12-12-2005, 04:33 PM

Quote:

Originally Posted by Ondonti

You can clearly see that the AMS evo has horrible wastegate placement, thus 2 wastegates are needed to keep boost steady.

You call that horrible placement? Where else would you like them!? Both wastegates are fed right from the collector on both sides... one for each of the divided tang entry.

Yes, that is a 42R on the car, and that is NOT AMS' car. That is a customer of AMS, Chris is his name I believe.

AMS has found that a single 44mm TiAL is not good enough for their 42R setup, and that the dual 38's work much better on controlling boost.

This has been proven so on both AMS' actual race car (Silver Evo, 9.41 @ 156 mph NO nitrous), and Al Friedman's GT40R Evo. The 40R car used to use a 35R w/ a single 44mm gate, when they switched over to the 40R the boost ran away from them and was not controllable.

Aaron Miller