Right now I am working on my current 20B project car. 1990 JC Cosmo Type S.

side port 20B
fresh rebuilt

Haltech e11v2
profec B Spec 2
Jacobs box

3 X 1680 injectors (replace secondary injectors)
replace FPR
replace PD
add 2nd pump ( most likey a walboro 255)
ssb fuel lines 8an feed and 6an return
fuel pressure guage
aquamist water injection

custom twin pass radaitor
custom bar and plate FMIC
GT40R 88mm with 1.06 a/r
Tial 44mm gate

FC cluth and brake pedal
FC 5 speed trans
hks twin plate

This is not going to be drag car.

The plan is to make 500 - 550rwhp and spool very quick, as now just crusing the car around it almost nevers gets above 4000rpm. crusing on the highway at 100kpm its at 2200rpm. so I want it to be able to start spooling very quick

here is the comp map




in looking at the comp map, Im thinking it will make around
450 - 460 @ .9 - 1 bar
~500 @ 1.1 to 1.2bar
~550 @ 1.3 - 1.4bar

I know we all like big turbo and I though about a GT42R, but Im not planning on making 700 - 800hp. I wounder if there is something in the middle like a GT41..

any comments questions or recommations are welcome.

here is a link to project car right now

http://ultimate-cosmo.cyberosity.com/gallery/v/

 

If your going to throw the walbro in the tank next to the stock cosmo unit I would make sure they flow the same. I don't know first hand but I have read that if there is a difference in fuel pressure where both pumps meet it can create a problem.

-Deztin

 

yes I think your right I will just run a pair of walbro's and ditch the 15 year old comso pump.

 

just run the GT42R!!!

neil

 

not sure if the gt42r will bring on the boost quick enough

im starting to lean to the GT42R but I have only found 1 dyno sheet with it. and it was only @ 8psi. is there more sheets out there?

I asked him when did the turbo start to spool but he never answerd back. anyone else with this turbo care to share when does it start spooling?

 

If your talkin about 203rotor i have been in the car many many times and spool is no prob u're pretty much flying at 3000rpm !

 

yeah I sure thats the car, the white fc. Has he turned up the boost? redyno'd? Im trying to find out more info before I take the full plung. I would like get an idea on when it starts to spool.

 

I'm going to pull my finger out this weekend & get some pics of that manifold for you.

Have to drop by that guys place on Saturday morning.

REgards

 

87-
i just got my GT42R from aspec yesterday, i should have a dyno sheet for you in a few weeks, after the motor is broken in. remind me and i'll send it to you.

 

cool thanks, Im doing JCI inspection next friday so after that I will start modding the car.

 

kewl keep us updated. I went to a Garrett turbo shop here. they recommend a Garrett / HKS hybird. he said he can build it cheaper than GT42R

Garrett T4 flang 1.06 exh housing
82mm exh wheel
GT42 char dual BB
HKS 94mm Comp wheel
HKS T51 Kai comp housing

said it should spool quick on street ported 20B.