thanks freddie!! and it wont ever see 7600 rpms anyways so you wont see that datalog, its stock motor and i liek my motor so its not going to ever see 7600 rpms
an like i said above the video that it wasnt good i had cars infront of me so i couldnt stay on it hard...

 

Don't get me wrong, man. I'm not here to knock you, I think its great that you did this on your own as opposed to buying parts. I'm just here playing devils advocate, so that you can see all sides of the situation.

By the way, the stock redline is 7600rpm. It is very safe to rev that high on the stock motor.

 

i no i no i see all sides here

 

You can`t really make a worthwhile comparison between how the car spooled before the installation of the external gate and after. In any case, it would be totally subjective, without an established baseline, without a means of accurate measurement, or any quantifiable data whatsoever. There would be so many uncontrolled variables that we would have to just trust to faith. There is no point of even thinking about before and after spoolup comparisons in this case. Unless we had nothing better to do.

 

that is true but as just a feeling i cant notcie any but i no thats just a feeling still but we'll have to wait and see next dyno run f anything else has changed

 

To have made a meaningful comparison, your original internal gate would have had to have been optimized for spoolup via the proper level of wastegate preload. The stock actuator properly preloaded to about 19-22 PSI will spoolup the turbine differently than if you have it setup with a wimpy 12 PSI of gate pressure. If we don`t know for a certainty that your old setup was optimized for spoolup then the comparison would be meaningless as it would favor a properly setup external gate. So both gates would have to have spring pressure optimized for the test to be on equal footing.

All other things being equal, there really shouldn`t be any significant difference in spoolup between a properly preloaded internal gate on the stock turbo and a manifold mounted external gate. Ask me why?

 

so many cranky people... you guys are obviously not oldschool DSMers. I like it... I'm not into external dump so i won't be cranking up the welder but it's still pretty cool. A very small peice of flat sheet cut just right and stuck in after the Y comes together would settle all the "twin scroll" debate.

 

I guess that I forgot to say that I like the way it looks too! Nice concept, good execution! Overall an enviable bit of fab work Just that integral WG's are my red button topic, so, sorry!

 

well thank you... but im to external wastegates as you are to your internals... i love them haha

 

you should have just did two externals off the manifold. now that woulda been sick

would have looked like an hta set-up haha

but still good job man im looking into this more but looking at the twin wastegate

 

i was thinking of doing two seperate wastegates but its wayyyyy more expensive and theres like no room to work on the drivers side of the mani so it would be a lil more difficult... im making another set up this week that will be set up the same way but be a true twin scroll set up still

 

Old school dsm's didn't have twin scroll

 

haha good point

 

My first turbocharged car back in 1975 had a twinscrolled turbo and manifold. It was a european market BMW 2002 factory turbo. It had a slow spooling KKK twinscrolled unit on it and a TS cast iron factory exhaust manifold. Youcan't get much more "old-school", than that, can you?

The KKK had a non-gated turbine housing. There was no exhaust wastegate whatsoever. Boost was controlled at 8 PSI via a VTA compressor bypass valve(essentially a BOV) located before the throttlebody. This was way before "old school"DSM's were even spawned.

EDIT: Sorry for the OT rant. Eventually, I put a blockoff plate in the bypass valve which increased boost to about 10#. Finally, I got rid of the KKK and the cast factory manfold altogether and adapted a tubular header and an IHI RHB5 turbo and a SPARCO FMIC. But, that's another story.

 

KKK??? haha