As the heading suggests, are there any gains to be had by using the AMS/Mike Smith manifolds on stock auto turbos? Will there be a significant increase in spool at lower revs? The goal in mind here is to end up with a car that has excellent low and midrange torque, I'm not too concerned with the top-end tradeoff. Thanks in advance for any insight. :zlove:
To create less lag, the whole system needs to be matched, throwing on bigger mani's will possibly create more lag on a standard charge air system. The MSP main's are very large compared to stock. Even to get them to slightly match the exhaust ports requires alot of work with a die grinder. Concentrate on the dumps, exhaust system and intercoolers. Look at something like 2.5" extended dumps, with a long wastegate runner. The other thing that will increase spool is HPC coating everything possible.
Or inject fuel straight into the manifold on WOT. She'll spool up in no time** **No guarantee on the longevity of your exhaust wheel, housing or seals.
Awesome, that's good info, so essentially with the larger manifolds potentially slowing spool on original turbos would it be because exhaust gas velocity would be slower within them compared to the OEM pieces, if that makes sense? I'll be following your advice anyway, the Labree super split 2.5 inch dump pipes look like a real nice bit of gear but there's such a price discrepancy between them and the N-Power dumps. Guess you get what you pay for though so I'll probably fork out the extra coin and get them, then have them HPC coated. Would it pay to get front pipes HPC treated as well or just the dumps in your opinion? Oh and I'll be getting the Z1 side mount intercoolers, they use the existing ducts and don't foul with the indicator bulbs too which is a bonus and they're relatively cheap.
Pretty much. To truly gain from the benefits of larger exhaust mani's you need to do a bit of port work on the exhaust ports. As much as people use them as such, they are not a "bolt on" upgrade in the true sense of the word.
That's how one type of anti lag system works. Fuel ignites in the manifold and the expanding flame front and pressure cause a massive spool up. BUT it isn't great on turbo longevity.
HPC the font pipes aswell as turbine housings, intercooler pipes, upper and lower plenums and manifolds. If you rally want to get serious, ceramic coat the exhaust ports aswell. This won't be a cheap excercise but will be very effective.
