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Gtir Motorsport club » Tech room » engine build's » Manifold question/external wastegate

Manifold question/external wastegate

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1Manifold question/external wastegate Empty Manifold question/external wastegate on Mon Jan 29, 2018 1:32 pm

Bandyleg

Bandyleg
So as most of you know im slowly making progress with my car... today i removed the turbo from the manifold to find that the external wastgate is only venting cyclinders 1 and 4.... ive had my little fingers down the hole to double chek...
I could do with knowing what issuez this wil cause or is their justified reasoning for this? Manifold question/external wastegate 20180118

2Manifold question/external wastegate Empty Re: Manifold question/external wastegate on Mon Jan 29, 2018 4:21 pm

Bandyleg

Bandyleg
I forgot to say, i know that eventually they all connect... and im probably just being daft but im just double checking

3Manifold question/external wastegate Empty Re: Manifold question/external wastegate on Mon Jan 29, 2018 11:03 pm

gtir_woody

gtir_woody
moderator
moderator
Where exactly is it on the manifold, I think I know but can’t tell in that pic

4Manifold question/external wastegate Empty Re: Manifold question/external wastegate on Tue Jan 30, 2018 8:51 am

Bandyleg

Bandyleg
Manifold question/external wastegate 20180119
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5Manifold question/external wastegate Empty Re: Manifold question/external wastegate on Tue Jan 30, 2018 11:01 am

GTI-R US

GTI-R US
Management
Management
Never seen that done on a stock manifold before and as you say it will only work on the two outer cylinders.
Actually will not make any difference to the performance of the wastegate i would have thought. Once the desired boost pressure is reached the wastegate will still open in the same manner as it would if working off all ports.

Interesting though what they have done to that manifold especially with the thicknesser plate added.
The only thing i would do if i were you would be to port the wastegate apperture as it looks to be very restrictive, would also port the manifold aswell (as its obviously running a large turbo) and match it to the exhaust ports in the head.

Have you got a pic of the entire manifold?


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6Manifold question/external wastegate Empty Re: Manifold question/external wastegate on Tue Jan 30, 2018 4:22 pm

Bandyleg

Bandyleg
Yeah, the wastegate is badly badly done... oys rougher than a badgers arse in their, so ive every intention of porting it. Im also considering welding the manifold extender plate onto the mani so it can be ported as one as its also badly done.

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7Manifold question/external wastegate Empty Re: Manifold question/external wastegate on Tue Jan 30, 2018 4:23 pm

Bandyleg

Bandyleg
The little penny flap has been welded as expected to convert to external wastgate.

8Manifold question/external wastegate Empty Re: Manifold question/external wastegate on Wed Jan 31, 2018 12:52 pm

GTI-R US

GTI-R US
Management
Management
Has that turbo got a wastegate penny?
looks like a 4 bolt flanged 3076-8 to me so surprised it came with an internal gate in ex housing scratch


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 In association with
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Services provided

Forge Engine rebuilds to specification
Body Restoration, Fabrication, Repair
Paint refinishing facilities
Ecu re-mapping-Performance upgrades
Auto Diagnostics, Injector cleaning  
Race & Suspension setup
General Servicing, Mots, tyre fitting
Full workshop facilities
http://www.gti-r-us.co.uk www.force500.com

9Manifold question/external wastegate Empty Re: Manifold question/external wastegate on Wed Jan 31, 2018 1:54 pm

Bandyleg

Bandyleg
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10Manifold question/external wastegate Empty Re: Manifold question/external wastegate on Thu Feb 01, 2018 2:41 pm

Mr B

Mr B
gtir technician
gtir technician
Normally when you do this 2 important things are angle of wastegate flange runner to ports, needs be a y angle rather than 90 angle, also you add a small balancing hole in the manifold divider to help balancing and wastegate smoothness .
I done a post on here few years back on this with some info/pics .

Can work well but starts getting to point that a steam tube custom manifold starts looking better way go pending on turbo and power goal .

11Manifold question/external wastegate Empty Re: Manifold question/external wastegate on Thu Feb 01, 2018 6:48 pm

Bandyleg

Bandyleg
I dont suppose you know where abouts that post is mr b?
My goal was never to run big power, I only want 380-400 and that should be easy done... im more worried about the current manifold set up causing pressure problems as im not exactly clued up on these things. Ahhhh the life of a pulsar owner, always something lol

12Manifold question/external wastegate Empty Re: Manifold question/external wastegate on Fri Feb 02, 2018 11:41 pm

Mr B

Mr B
gtir technician
gtir technician
This is one thread touching subject in couple posts .
http://www.gtir-motorsport-club.com/t6995-hi-flow-bov

Was another which thought done on hear with some pics as well but not found that yet, 6:40am here and I need some breakfast ....

13Manifold question/external wastegate Empty Re: Manifold question/external wastegate on Sat Feb 03, 2018 7:47 pm

Bandyleg

Bandyleg
Thanks Mr B, ill have a read through see what I can pick up from it.

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