The Evolution Celica Page 3
EVOLUTION STAGE 3 ---18RGU--- 16.4 SEC 1/4 MILE 125 HORSEPOWER
I found and built an 18RG for the car. Nice engine, revs easily to 8000 rpm.
The details of the engine are here... 18RG buildup and does an 18RG fit in an AE86?
The rearend gears are pretty tall considering the torque curve of the
engine, the car finished the 1/4 mile in third gear at 85mph. Who knows
what the top speed would be, I never tried to find out...
I have exactly 0 pictures of the car with the 18RG in it. It had a white cam cover and made trips to Firebird raceway, Speedworld raceway and several SCCA slaloms in 2002. It ran consistant 16.4 sec 1/4 miles and might have done better if not for the kinks in the exhaust pipe right near the exhaust manifold. Since I don't have any pictures of the 18RG in the car, I figured that this might be a good place to put pictures of other 18RGs that I have.
Here are two awaiting rebuilds. Have you ever seen two 18RGs next to each other?
Here is my latest... a racing 18RG.. 10.5:1 compression, 280 degree HKS cams, HKS intake manifold, weber 45's, 4 into 1 header, ported/polished head, Total Seal rings. It may see its way into a buddy's 74 celica soon... I'll keep you posted.
On with the EVOLUTION......
The 'White top' 18RG stayed in the car for about a year. It wouldn't pass an
Arizona emissions test. The 44mm Mikuni carbs were too large to provide
good atomization of fuel at idle. I don't think the 40mm size would be
much better. Since I couldn't register the car with carbs, I had to do
something to make it run cleaner... adapt EFI !
The search was on for fuel injection parts for the 18RG. It's tough to
find parts in a reasonable price range for a 25 year old engine that was
never officially imported to your country. I thought that if I used an
EFI 18RG intake manifold, I could use the rest of a 22R fuel injection
system to make it work.. Injectors, AFM, ECU, temp sensors...etc...
So then I had the idea of putting a fuel injected 22R in there at
least to get the fuel injection system up and running for the 18RG. But
as long as I was going to go fuel injected, why not add a turbo for some
real power?
The plan was to put in a turbo 22R just to get the fuel injection working
and ready for the 18RG transplant. I could pick up a 22R with EFI at a
junkyard, a ct20 turbo, I already had a 22R turbo exhaust manifold,
install the computer and work all the bugs out. All the while, I would be
collecting the hard parts needed for a turbo-ready 18RG. Manifolds,
pistons, rods, cams... Holy Cow! that's a LOT of expensive parts! It
would be very nice to have a turbo 18RG, but there's just too much to
fabricate or find compared to parts that are already commonly available
for the 22R.
So, after doing some airflow math...
(18RG) 2000cc x 8000 rpm = 16,000 liters of air/min
vs
(22R) 2400cc x 6666 rpm = 16,000 liters of air/min
Hmmmm, the 22R's size can theoretically make up for the lower RPM it will turn
compared to the 18RG.
So, I will build a strong 22R turbo and forget the plans for the 18RG for now.
To see how far the 22R turbo has come... click here. Celica page 4
