Supra Used Car Parts

Archive for the 'Tech Articles' Category

Piston Comparison: JE vs. Wiseco vs. Toyota

Friday, March 20th, 2009

Supra Piston Comparison JS Wiseco ToyotaHere is a visual comparison of mk3 Supra pistons: from left to right: JE piston, Wiseco piston, Toyota OEM piston. Other than the presence of teflon protective coating, there seem to be very few visual differences in construction of JE and Wiseco pistons. One notable difference seems to be the location of piston ring seats. The construction of both pistons seems to be similar although JE piston is lighter than Wiseco piston. Toyota OEM piston visually differs from both JE and Wiseco in both skirt length and internal construction, as well as the location of piston ring seats. Toyota piston is also the heaviest. Recommended minimum piston to cylinder wall clearance for JE: 0.004″. Recommended minimum piston to cylinder wall clearance for Wiseco: 0.0025″. More pictures: Pic#1, Pic#2, Pic#3.

Toyota Pistons & Rods vs. JE Pistons & Eagle Rods

Monday, May 26th, 2008

Supra Pistons vs JE PistonsHere is a photo depicting visual differences between Toyota Supra factory original pistons & connecting rods (on the far right) vs. JE pistons & Eagle rods (on the left). The piston skirt length and design is apparently different, and so is the piston ring thickness and location.

CT26 Upgrades: HP + FAQ

Sunday, March 16th, 2008

CT26 (stock):
Compressor Inducer: 1.75″
Compressor Exducer: 2.559″
Turbine Minor: 1.97″
Turbine Major: 2.36″

Good for approx ~31lb/min (about 450cfm) of airflow, around 13.5psi. I would not exceed 13.5psi, though you will hear of people pushing 20psi. If you want the turbo to last, do not exceed 13.5psi.

CT26 Upgraded:
The CT26 upgrade is great for those on a budget, or if you want a super-fast spool. The upgrade consists of sending your stock turbo off to a turbocharger shop, and having them bore out the compressor inlet to fit a larger compressor wheel into the CT26. Generally, T04e wheels are used, though I have heard of T04b wheels being used. Bang for the buck, it is hard to beat the upgraded CT26.

The downside to that great spool, is you still have the restrictive exhaust.

Upgrade levels one may choose from:
50 trim - Considered the most reliable upgrade.
Compressor Inducer: 2.12″
Compressor Exducer: 3.00″
The T04e 50 trim wheel is rated @ 44lbs/min @ 2.0PR, and 65% efficiency at that point.

57 trim - The most popular upgrade, while still being very reliable.
Compressor Inducer: 2.23″
Compressor Exducer: 2.95″
The T04e 57 trim wheel is rated @ ~40lbs/min @ 2.0PR, and 60% efficiency at that point. Raymond Khublal in Orlando, FL has laid down 422.1 rwhp/460.2 rwtq as shown on with this turbo.

60 trim - Not to be confused with the 60-1 upgrade, this is a less reliable variation of the 57 trim. More power is to be expected from the 60trim vs the 57trim.
Compressor Inducer: 2.29″
Compressor Exducer: 2.95″
The T04e 60 trim wheel is rated @ ~46/min @ 2.0PR, and 65% efficiency at that point.

60-1 (T04b) The 60-1 is a T04b wheel, and the biggest seen on a CT26. The least reliable upgrade, but has made the most known power.
Compressor Inducer: 2.324″
Compressor Exducer: 2.95″
The T04b 60-1 wheel is rated @ 56lbs/min @ 2.0PR, and 65% efficiency at that point.

These wheels are rated at a specific flow WITHIN their own respective compressor covers. The CT26 cover is small, so you will not get the 56lbs/min you want with the 60-1. This also holds true with the T04e 50 trim - it seems the best on paper, but we have yet to see one crack 350hp.