Norwegian_rotary

Hello, I'm building me an 20b engine with a single turbo, my target is around 500-600 bhp..

What size on the wastegate should i use to get the exhaust away without any pikes at the boost?


hope anyone in here can give me an answer to my question.


Roar Harlem, Norway

hwnd

iTrader: (4)

spikes are caused from "the lack of wastegate".. in other words if you're wanting to run .01bar of boost then you'll need to have a wastegate big enough to flow that extra exhaust.

so say you're wanting to run 2bars of boost - you wont need a large wastegate because you wont be wasting much exhaust.

..something like that. correct me if i'm wrong.

Norwegian_rotary

i will run around 15 psi boost.. 1 bar

CMonakar

I have a 60MM HKS wastegate. I haven't boosted the car yet, so I can't speak from experience, but the consensus is 60mm is necessary if you want keep the boost down to 10-12 psi. Hwnd is right; a bigger wastegate allows you to produce less power.

Norwegian_rotary

ok, where do you guys buy your wastegates? ebay?

hwnd

iTrader: (4)

i too have a 60mm gt hks gate.. got mine from hks-usa.com

zbrown

I assume you are talking with a 20b?

I can get excellent control down to 10psi with a single Tial 44 with a Gt42 on a fairly large port REW.... that is with the WG plumbed into the DP aswell. High/comp engine too

Norwegian_rotary

I see, but this is a 13b engine isn't it? i guess the 20b engine have a lot more exhaust to get rid of, so i dont think it's a bad choice to use a 60mm wastegate to controll the boost.

This is what i have bought for my engine..


Regards
Roar Harlem

arghx

iTrader: (3)

manifold design plays a big role in how well a given wastegate is going to work in preventing boost creep

teachermechanic

iTrader: (4)

I run 10psi on Tial 38mm. Street port 20B.
Check at the end of video no boost creap on the data:
http://videos.streetfire.net/video/8...cd0137e901.htm

t-von

iTrader: (8)

Location is more important than size.

https://www.rx7club.com/showthread.p...light=location

RETed

fricken wrong post I quoted...


-Ted

RETed

What gear was the run made at?
It sounds like the first run was made in 3rd?
Then the second one in 4th?

Also, is that the only air filter you're running?
Too small an air filter will also help choke the engine down.
I'd bet if you ran with no filter, it'll boost creep on you...


-Ted
__________________

crispeed

What's the deal with the the other dyno runs? I saw one where the power was at 750hp/637tq.
Nice car by the way.

Jason

iTrader: (5)

This is a great wastegate. We have used it on many applications.

http://www.rx7store.net/product_p/sy...m%20wasteg.htm

teachermechanic

iTrader: (4)

Yes first run is in 3 and seconde in 4 gear.
It's the air filter i use all time.
For the # you see, i thing there is the # defore correction