Thanks for the update. Still waiting eagerly.
By changing the manifold it looks like you are making 300 tq around 3200rpm, before you were making that around 4200rpm.Who's interested in Dyno data for custom manifold vs ported stock manifold ?
Cliff's: 32 wHP and 10 wTQ
Details: I have a SFS GT28 V3 kit that until recently had an early SFS custom welded tubular manifold. Setup includes 264 cams, stock/Gforce ECU, SAFC2, meth/water injection.
As I posted last page, my custom exhaust manifold developed multiple cracks. I recently replaced it with my stock manifold after $200 of porting. The porting work looks great, there are some pics last page too. I was hoping I'd see minimal power drop off, but regardless I am happy to have no further concerns about manifold failure. I suppose the driving experience is more influenced by TQ than HP, and down 10 TQ is pretty minor. The car is now issue-free and the most completely dialed-in that it has been for my 4 years of STU Hybrids ownership.
91 oct + meth:
Custom mani 534 hp 486 tq
Stock mani. 502 hp 476 tq
96 - 100 oct + meth:
Custom mani 555 hp 500 tq
Stock mani 523 hp 490 tq
Dyno comparison variables:
Both were on the same dyno. The custom manifold runs were done in 2016, ambient temp 100. The high octane pulls in 2016 were on a mix of about 100 octane. The 2019 stock mani pulls were ambient temp 80, high octane pulls were on a mix of about 96 octane. The A/F adjustments had been tinkered with over the intervening years, but on both sets of dynos A/F was adjusted to target of about 11.5
Graphs below are for the 91 octane pulls
2016 Custom Manifold:
View attachment 242624
2019 Ported Stock Manifold:
View attachment 242625
Ya know Ben , I had not really spotted that - thx!By changing the manifold it looks like you are making 300 tq around 3200rpm, before you were making that around 4200rpm.
To me your power delivery looks much better with the ported OEM manifold
You can see that difference in the transition between turbo 1 and turbo 2, the OEM manifold looks a lot better overall.Ya know Ben , I had not really spotted that - thx!
I'm very happy with the set up now. There was also a bit of roughness in the decel when coming off hard-throttle with the custom mani, that is gone now.