Proud DSM & Impreza WRX performance specialists Impreza WRX DSM / Eclipse Valley Stream, NY (516) 435-6586

Nat's '90 Eclipse GSX — Full Build

As many of the local customers know, this is a special car to us. Nat is a very close friend and a brother to us. He also let us have our way with his car. The outline of a very clean and daily driven car that is ultra fast, looks unique and still within budget was the call.

Front view of Nat's 1990 Mitsubishi Eclipse GSX in custom platinum gold paint
The GSX in its custom platinum gold paint.

The car

A 90 GSX. Found at the local train station. Ehren had left a card on the car asking if it was to be put up for sale to please call. Sure enough, a few months later he called. Since then it has been gone over in and out. A new paint job in a custom gold, a bit lighter then factory.

Polished compressor housing of the HSP custom built 18G turbo
Polished 18G compressor housing.
Underhood view of the built 4G63 motor showing coated intake pipes and polished parts
The bay with bright blue coated intercooler pipes.

A combination of parts selected by us and many hours of work make this car what it is. From the clocked (turned down) compressor housing to allow for a shorter and straighter piping set up, to the coated intercooler pipes that both come through the radiator support in a bright electric blue. The high temp coatings on the 95 manifold, turbine housing, EVO III O2 housing and the dump for the 40mm TiAl external wastegate keep the under hood heat down, and the many polished parts add to the custom feel under the hood and all around the car.

The inside was not overlooked. Nat's car was a leather car, so the seats were beat up and didn't look that good. As many of the older leathers fared, we couldn't find a set that Nat was happy with — and even a free set that was better than his was still no gem. As many know, the factory seats are "OK" at best, and this was a major problem for Nat. He wanted seats that fit him well and also looked good, so Corbeau racing seats were installed. A VERY nice fit and look, and it makes you feel one with the car. Till the cage goes in he will be using the factory seat belts, but later a harness will be installed.

Detail shot of turbo and bay components from the GSX build
Turbo and bay details.
95 exhaust manifold HSP Pro ported with the 40mm TiAl external wastegate
95 manifold Pro ported with the TiAl 40mm wastegate.

The parts list is a long one, but it's not always what you see that makes the gains. An HSP Pro port job was done for this car. The exhaust manifold is a new 95 manifold Pro ported, and with the use of a TiAl 40mm wastegate we are able to keep it all under control. The turbo is a custom built 18G to HSP specs. The compressor is clocked, ported and polished on the outside (polished above). The turbine is Pro ported and the internal wastegate welded fully — not like some others that just put a tiny weld that allows it to leak. The O2 housing (turbo elbow) is an EVO 3 unit new from Japan. This housing is simply MASSIVE, and from the outside looks stock to the untrained eye. This housing allows for pro porting to bring it to 2.5" out of the turbine wheel and a massive 3" out to the down pipe of the exhaust system.

Underside and underhood build detail of Nat's GSX
Build detail.
Additional build photo of the 1990 Eclipse GSX
More of the build.

At the moment Nat is saving his money for the next round of mods. This will be a clutch to take the power and some other needed things. But as we all know, "is it truly ever finished?" We want to get the car to the track for some shake downs before the year's end. This can't happen till the clutch goes in. Right now the car is set at 10PSI and the factory clutch is slipping. This didn't stop him from taking a new Ferrari 348 TS the other night, but this isn't here for kill stories. So as things change we will keep you updated and follow up with the full story and build up of Nat and his car.

— BM

Here is the list of Mods...

Fuel

  • ND 660CC/Min injectors
  • Walbro 225 fuel pump
  • Rewired fuel pump
  • Apexi AFC

Motor

  • HSP 3" intake pipe
  • 2G Mass air sensor
  • K&N air filter with 2G MAS adapter plate
  • 18G 7cm2 turbo upgrade, Pro ported, rotated compressor housing, welded W/G flapper, polished compressor housing, heat coated turbine housing
  • HSP ultra short intercooler piping kit — 2.25" lower pipe and 2.5" upper pipe
  • HKS Throttle body elbow (polished)
  • 95 exhaust manifold HSP pro port with TiAl 40mm W/G flange tig welded on — heat coated
  • EVO 3 turbo elbow (O2 housing) pro ported to 3" out of the housing and 2.5" from the turbo — heat coated
  • 18" FMIC, top to bottom flow, polished
  • Balance shafts removed
  • 2.5" full exhaust system Greddy cat back, press bent (it was cheap and before we ever thought about building the car — FOR SALE!)

Drive train

This is still stock. It's Nat's first race car and we want to be sure that he is ready for the race clutch. The ACT 2600 will be installed within the next month. We will be replacing the rear when it lets go, and the tranny will get the once over this coming month with the clutch install. The rebuilt tranny will carry all the trick parts for the beefed up race car.

Gauges

  • Autometer boost gauge
  • Greddy 60MM EGT with warning and peak recall
  • Autometer AFM
  • Jumptronics (used for voltage only)
  • AFC blue wire mod for O2 voltage
  • Pocket Logger for dataloging and tuning

Misc.

  • Corbeau racing seats
  • Clarion CD and EQ, RF Punch amp, Infinity door speakers
  • Whole car repainted custom platinum gold
  • BG syncro shift tranny and T case, BG Ultra guard in the rear

If you have any questions about the car, please feel free to contact us at Sales@holeshotperformance.com.

If you have any comments or questions for Nat, drop him a line at Nat@holeshotperformance.com.