Hello to everyone (My first thread)
I have an Evo 9, recently built in 2,3 Stroker. I decided to go with AMS V Band turbo kit 5858. The car made 553 Whp on Mustag dyno with pump gas. With that power I am quite happy, but I noticed that car is a bit laggy. It feels like turbo start spools around 4200-4300 Rpm. Does anyone had same experience? Does anyone knows if I can do something in order to have better spool and a bit more top end? All opinions / suggestions are welcome.

 

i have a 5858, stock block waiting to be tuned. how much boost u running? are u hitting full boost around 4200?
post a graph.

 

I am hitting full boost higher. 2,2 bar(=31.9PSI).Se also dyno for your reference.

 

ball bearing or journal. i think you are in range for spool up

 

It is AMS Turbo Kit. This is Ceramic BB T/C with CEA Billet Compressor. I read that Precision released SEA2. I asked them but is not for 5858. I would like something around 3800-4000Rpm. Waiting opinions ..

 

Your options are smaller turbo or larger displacement. Some things just are what they are. I downsized from a 6262 to a 5858 on my 2.3 because I was after the same thing as you. Peak torque is right at 4750rpms and I see 22.5 psi at 4200rpms.

 

With smaller turbo I will lose power at top end, which I don’t want. Larger displacement, do you mean to go with 4g64? Now my engine has 8,8:1 Cr, increasing Cr to 9,0:1 will not help? I want to avoid going more than 9,0:1. Different camshafts could help? See also below Engine’s modes for your reference. Any suggestion is always welcome

• WISECO 1400HD Stroker Bore 85.5mm , Stroke100mm
• Manley Turbo Tuff I-beam series Connecting Rods with ARP Custom Age 625 Cap Screws
• K1 Lightweight 100mm Crankshaft
• Cosworth Main bearings set
• Cosworth Rod Bearing set
• Cosworth Thrust Bearing set
• ARP main Studs
• ARP “CUSTOM AGE 625+” headstud kit
• Hks Kevlar High Performance Timing Belt
• Cosworth CNC ported Cylinder Head Evo 9 Mivec
• Cosworth Head gasket (OEM Thickness)
• Tomei Procam Intake 270-11.5mm Camshaft
• Tomei Procam Exhaust 270-11.5mm Camshaft
• HKS R-Type intercooler Kit
• Kansai Service intake manifold
• HKS Adjustable Cam Gear
• Custom made delete kit
• AMS Oil Cooler kit
• Mishimoto Performance Radiator
• Mishimoto Radiator Hose Kit
• Cosworth LowTemp Motorsport Thermostat
• HKS Low Temp. Oil Cooler Thermostat
• S90 74mm Throttle Body
• AMS EVO 9 Fuel Rail
• Custom made fuel system with one Walbro fuel pump inside and one outside (Similar to AMS)
• Tial Q bov silver with stainless steel flange
• Injector Dynamics 2000cc (high impendence), Didn’t managed to install.Installed Bosch Motorsport 1000cc or 1100cc (I don’t remember well)
• Aeromotive Universal Fuel Pressure Regulator
• AMS Cat Back Exhaust
• AMS Stainless Steel Resonated Test Pipe
• AMS VBand Turbo Kit (Precision 58/58 Turbo) including front eng. mount insert
• AMS speed density intake kit for AMS turbo kit
• Autronic SM4 PnP with Knock Module
• Autronic Mac 4 port boost solenoid
• Spark Tech EVO 4-9 Street Sequential Ignition System. Didn’t manage yet to install it.I didn’t find the way to work properly with Autronic ECU.
• Ingalls Stiffy Engine Torque Dampener
• Mishimoto Baffled oil catch can

 

Any other opinion that could help? All opinions are welcome

 

hello, you have to take a S200SX for better spool

 

Smaller turbos spool early and fall off up top whereas larger turbos spool later but make more power later in the powerband. You have to pick one or the other; can't have both. Spool at 4200 with 550 hp sounds pretty darn good to me.

 

First of all thanks a lot for your time to reply. Which model of S200SX? Do you have that turbo in your car? Any graph?

 

It is just my personal opinion, for me looks a bit laggy. However, thanks a lot for your opinion& time. As I said all opinions are welcome, even if different turbo, camshafts etc. “Always there is room for improvement…..”

 

Does anyone know if replacing cams with S2s and run more timing could help?

 

power is very nice for your setup. the spoolup looks pretty good as well. the S2 cams might help. maybe 200rpm faster. the best thing to do to achieve your goal is change the hotside and header to a twin scroll setup. with the right parts you can gain 500rpm sooner TQ.

 

S2 or S3 will be better for my set up? Do you know if PTE 5858 is available in T3 (or T4) Twin scroll ? For header, do you mean replace manifold with divided (Twin scroll) one?