Tuesday, December 10, 2013

FA20CLUB Turbo Kit Discussion part 1

We decided to finally create a specific point of information for all the inquiries we get daily regarding the plethora of current options for our turbo kits. Most of our current customers have little if any previous forced induction experience. This Thread should help shed some light on the detailed options you guys have to choose from when considering a Turbo FRS or Turbo Brz via FA20Club turbo kits.




Turbo Selection:

T3/T4:
This particular line from Garrett's stable is based on older but still very productive nonetheless. These turbos along you to get a base kit with journal bearing turbo. When considering these turbos there are a few things to consider. While you can run up to about 20 psi on these anything above an beyond that boost level the bushing inside the turbo isn't well suited to sustain the thrust load. What this means is you'll end up stressing the support system for your turbos shaft. But don't worry we have proven that these turbos as well capable of making great power below those boost levels.

50 Trim:
This turbo is the smallest compressor wheel in the lineup. This will allow for faster spool times considering the reduced size. The trade of is you will most likely be required to run a couple more pounds of boost to make similar numbers to the larger members in the T3/T4 family. Since we use them with the Stage 3 turbine wheel you can expect roughly boost to start to build around the 3200rpm with light throttle application. We testing these with boost targets of 10 psi which were achieved at about 3600 rpms.

57 Trim:
This is the selection we generally recommend for most Automatic transmission cars. From our experience to date this seems to be well suited for the At cars even though we have made more power overall with the 60 trim. Reason being is this works great with a bit more overall TQ. Since the At cars don't actually have much delay during shift this makes for a smooth acceleration rate. The only down side we have come across is around the 400hp mark you will be approaching the TQ limits on the factory clutch packs in the transmission.


60 Trim:
This turbo has been reborn and brought back from the dead. This was our original choice for these kits. With some extensive testing we have Been able to 480whp@20psi. So 500whp is very attainable on this engine with Race fuel or E85. These turbos show peak spool rpms 10psi@3800rpms & 16psi@4200rpms. No slouch here.

GT28
There are a few options for these available. You can go with the traditional GT2871 or the next generation GTX products. The difference is going to be when you decide to turn the boost up on them. When higher boost levels are run you will notice the GTX variants will yield a bit more power. There are also going to differences in IAT's at the higher boost levels. The GTX will keep your temp lower in the charge stream when running above 14-15psi. The GTX will also yield more usable power while doing so. What you'll notice with them is that they will carry higher back pressure. You can use either the .63 AR of the .82 AR. We recommend the .82 on this platform. You'll free up the top end. Some might try to tell you these things pull to redline but what they do is hold boost up there not power band. What you run into is a turbo that has a turbine wheel that's on the small side for this motors rpm window.

GT30
This is honestly our turbo of choice outside the T3/T4 family. Its best suited with enough blade surface a to minimize back pressure in comparison to the smaller GT28. The GTX variant is well balanced and is proven to make 500whp on our Stage 1.5 kit. This was done with the .63 AR since we didn't need the extra flow with a larger sized turbine wheel compared to the GT28. expect spool times to drop a bit on the GTX compared to the normal GT series because of the reduced rotational mass weight on the compressor wheel.

This should give you some decent explanation and recommendations for each of the more popular turbo choices from our kits.

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