Current best dyno power figure:
218.7 kw @ rear wheels
Current best quarter mile:

15.0 seconds @ 98mph

 

 

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This section details as much info is as on hand for bolt on turbochargers for the SR20DET. The main focus here are japanese aftermarket items, designed to mount on the standard manifold (or factory replacement) and use the factory water and oil lines. I have not dealth with the Garret range of turbochargers simply because the many variations are past my knowledge. When dealing with a aftermarket japanese turbo only one size and specification is available most of the time, meaning that performance on different cars can be easily compared. The Garret units can be highly customised by the turbo builder to the point wher instead of using a page like this you should really speak to someone like CGC turbos about what you are after.

 

What Turbochargers are Available?

Luckily SR20DET owners are spolit for choice when it comes to aftermarket turbos. The japanese tuning giants provide many bolt on kits as well as larger kits using custion manifolds to high mount the turbo. The followng table is based on that found at http://website.lineone.net/~jon_ed/Turbo_Table.htm. It has been reduced to bolt on options for this page but if you are interested in larger options check out the original page.

Some notes are as follows:

 

General Compressor Turbine
Model Power (PS)
BB?
 Trim Comp Inducer (mm) Comp Exducer (mm) Trim Turbine Inducer (mm) Turbine Exducer (mm) Housing A/R8
 
Nissan
S14 T28 300
N
 60 46.6 60.1 62 53.8 41.7 0.64
PS13 T25G 260
N
 60 43.3 56.0 62 53.8 41.7 0.64
RNN14 T28 330
N
 60 46.6 60.1 79 53.8 47.9 0.86
S13 T25 240
N
 60 39.9 51.3 62 53.8 41.7 0.64
 
Apexi
AX53B60 340
Y
 57 46 60.0 82 53 48.0 P25
AX53B70 380
Y
 57 53 70.0 82 53 48.0 P25
 
HKS
GT-SS 280
Y
 60 46.6 60.1 76 53.8 47.0 0.64
GT2510 300
Y
 63 47.7 60.1 62 53 41.7 0.64
GT2530 320
Y
 63 47.7 60.1 76 53.8 47.0 0.64
GT2535 340
Y
 56 51.6 69.0 76 53.8 47.0 0.64, 0.86
GT2540 350
Y
 46 51.7 76.2 76 53.8 47.0 0.64
GT2540R 360
Y
 46 51.7 76.2 76 53.8 47.0 0.64, 0.86
GT-RS 400
Y
 52 51.2 71.1 76 53.8 47.0 0.64
 
Power Enterprise
PE1420 350
Y
 57.5 45.5 60.0 84 48 44.0 P20
PE1820SP 380
Y
 56 52.5 70.0 84 48 44.0 P20
 
Tomei
ARMS B7652 380
Y
 52 51.2 71.1 76 53.8 47.0 0.63
ARMS B8446 420
Y
 46 51.7 76.2 84 56.5 51.8 0.86
 
Trust
T517Z 380
N
 50 48.3 68.0 ? ? ? 8, 10 cm2
T518Z 420
N
 55 50.6 68.0 ? ? ? 8, 10 cm2

 

Apexi AX53B60 P25

Not a lot is available on the net on this turbo or its variations, but I can work out a fair bit from translated Japanese pages. I do know that in T25 flange there is only one model of AX53B60 that exists, the P25 trim. Other models include the P18, which seems to be a popular bolt on turbo for naturally aspiratred Hondas, and is rated to 300ps.

The followings links are to pages that contain information about the Apexi AX53B60 P25:

http://babelfish.altavista.com/babelfish/urltrurl?lp=ja_en&url=http%3A%2F%2Fwww.k-style.gr.jp%2Fdemoca%2F..%2Fnewpage9.htm

http://babelfish.altavista.com/babelfish/tr?url=http%3A%2F%2Fwww.axia-sports.com%2Faltezza.html&lp=jaen&intl=1&tlb=1

http://babelfish.altavista.com/babelfish/tr?url=http%3A%2F%2Fwww.geocities.jp%2Fdraghistory%2Fapextabin.html&lp=jaen&intl=1&tlb=1

http://www.kendo-tuning.nl/01c1bd9412110cd07/000000944a0943701/01c1bd9412111cd0f/000000944a095a514.htm

The follwing is taken from Takakaira, which won't allow me to link to them so I chopped up my own copy of the page:

 

FUNCTION

  • The Apexi turbo kit is a complete bolt-on to the factory turbo kit location & fittings.
  • All items are specially made in-house by Apexi inorder to optimize & maximize turbine performance, (except for the turbo center section).
  • The Apexi logo is casted onto the aluminium compressor housing depicting that the unit is a genuine Apexi part.
  • Apexi managed to acheived the zero clearance for air flow due to its unique airick system to smoothen the airflow in the turbo housings.
  • All turbo models utilizes the reinforced spring actuator.
  • Apexi's turbo units adopts the reliable & proven IHI's water cooled ball bearing turbine.
  • For ease of installation, and to ensure enhanced durability of the turbo kit, all Apexi kits includes stainless steel mesh hoses.

By creating a new airick for the compressor housing during manufacturing, the tip clearance between the impeller and the housing reduces to a nominal value of 0.06 mm (almost zero!). This improves the compressor efficiency in the entire area by approximately 5% - 6%. In addition, this system reduces compressor exit temperatures by a theorectical value of 10 degrees Celsius. In actual driving conditions, the compressor exit temperatures could be reduced by as much as 20 degrees Celsius when the engine is performing at maximum power. Due to this system, an improvement in peak power is realized, and even boost pressures could be increased as a result of improved turbo performance efficiency. The latter also improves the torque output of the engine.

All Apexi models include a built in reinforced spring actuator.

Turbo kits includes a spring actuator as a standard equipment to tweak the supercharging pressure. For Apexi, it adopts a tie rod like strengthen spring for such tuning adjustments.
 

 

A:
Apexi turbine with the new airick system provides a tip clearance of almost zero, ensuring that there is no compressed air backlash.
B:
On turbine kits from other manufacturers, there is a tip clearance thats creates a compressed air back lash which causes air turbulence. This air turbulence creates friction, and as a result, created a hot spot in the turbine housing due to increase frictional temperatures.

TURBINE PERFORMANCE CHART of Car Model Silvia S14

    1:APEX 53B60/70 TURBINE, GT Camshaft (250dgree) -Boost 1.2kg/cm
    2:APEX 53B60/70 TURBINE, Standard Camshaft -Boost 1.1kg/cm
    3:Other Maker same spec turbine, Standard Camshaft - Boost 1.1kg/cm
    4:S14 Standard turbine, Standard camshaft -Boost 1.1kg/cm
    5:S14 Standard turbine, Standard camshaft -Normal Boost

 

 

I had one of these babies but it turned out to broken. I was aiming for betwen 230-240 rwkw on around 18psi boost.

Pics of AX53B60 P25:

1 2 3 4

Examples:

sr180 from Nissansilvia.com: 210rwkw @ 1.15 bar. FMIC, full exhaust.

Apexi AX53B70 P25

The AX53B70 should be good for a decent gain in kilowatts over the B60 with a corresponding loss in response.

 

HKS GT-SS

The GT-SS is one of turbos in the latest range from HKS. Along with the big brother GT-RS the GT-SS promises performance similar to the previous GT25XX range but with updated technology and aerodynamics. The GT-SS is rated lower than any of the other turbos in the new or old range, and as such is said to have the very best in response. This turbo would be used many times as a bolt on option for small capacity naturally aspirated four cylinder engines. On an SR20DET with fat midrange already, on paper the GT-SS should be the ultimate in response. I imagine it would deliver around 200rwkw of top end, with better response that a t25g (based on my experience with the GT2510). Interestingly this would mean it has less power potential than an S15 BB T28, but many have said that HKS are conservative in their power rating, so who knows.

The following pages contain info about the HKS GT-SS:

http://babel.altavista.com/babelfish/trurl_pagecontent?url=http%3A%2F%2Fwww.hks-power.co.jp%2Fproducts%2Fturbo%2Fturbinekit%2Fac_gtss%2Fac_gtss.html&lp=ja_en

http://babel.altavista.com/babelfish/trurl_pagecontent?url=http%3A%2F%2Fwww.ksp-eng.co.jp%2FFACTORY%2Fnew%2Fsr20%2Fgt-ss_ps13%2Fgt-ss_top.htm&lp=ja_en

 

 

HKS GT2510

This is my personal choice of turbo so I have more experience with it than others. Basically I find this turbo awesome for a street car. Response is what it's all about here, with boost building before your foot can hit the ground. Fairly smooth onto boost, with power building strongly and quickly until it really takes off up top where the standard turbo starts to drop off. This constant feed of power makes life hard for the tyres, on my car traction is not available until third gear in the dry. For example in second gear, full throttle: boost starts to build and steadily you are pushed back nto the seat, then all of a sudden as the power isreally starting to hit the surge disappears and is replaced with the engine bouncing off the limiter with wheelspin. Awesome stuff.

There are two versions of the 2510 as far as I can tell. The first had a different compressor cover with a round snout as opposed to the two bolt snorkel flange of the update shape. I am not sure if there were any other changes and therefore differences in performance. One thing you will notice is the large compressor cover compared to the small turbine housing. This factory size turbine is probably most of the reason for the response. On a VCT equipped SR20 this turbo would be even better.

1 2 3 4 5 6 7 8

Examples:

My own car: 218rwkw @ 18psi. Car specifications here.

 

HKS GT2530

 

HKS GT2540

 

HKS GT2540R

 

HKS GT-RS

 

Trust T517Z

 

Trust T518Z

Pics:

1      

 

Meggala: 203rwkw @ 1.2 bar. Full exhaust, GTR FMIC, 550cc injectors, Z32 afm, ecu remap.

 

 

 

 

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