JRW'S 91 318is turbo build

[wazzu70]

.83A/R T4 twinscroll housing. Did you make a new manifold or just adapt to a T4 flange and keep it open collector?

Which compressor did you go with? 56mm or 51mm?

Curious because I have been dreaming of a similar setup on my car. Also curious how it compared to the ford T3 60trim. Ive been concerned the S200sx is too large of a turbine.

The N55 turbocharger is essentially an S100 turbine with an EFR 62mm wheel ans smaller inducer. I think that would be an awesome turbo!

[jrw21]

This is the 51mm version. For now it is bolted on with an adapter. May make a new manifold for it at some point.

Going to run it on the dyno tomorrow, will post results.

[wazzu70]

Awesome, that seems like it will be a good fit. The 56mm would probably be too big and be sluggish.

[jrw21]

Today, 330whp/281two @ 25psi

Last run tomorrow shooting for 30psi!

[wazzu70]

Awesome! How is the transient response in comparison to the T3?

[jrw21]

here are the charts:

[wazzu70]

Great results! It must really scoot

Do you feel the drivability is not as good with the bigger turbo? Very curious if its too much sacrifice!

[jrw21]

Not sure on the street. The chassis still needs buttoned back up. Debating right now how to proceed. 80lb injectors are at 85-90% duty cycle at 340whp/26psi and wastegate springs won't hold pass 26psi. So, honestly I am tempted to upgrade the injectors and spring and see what it can do?

[wazzu70]

Focus on getting it driving first. You may find there is somewhere better to put that money!

[jrw21]

Focus on getting it driving first. You may find there is somewhere better to put that money!

Well, this many years into this project its hard to settle... Honestly, it may please more to see it produce.