I am building a GSR engine for my 91 crx. here are some questions i have:

Should I go with CTR pistons or aftermarket JE pistons?

Should I go with a Type R head or stay with GSR?

Should I stay with GSR cams or go Type R or would aftermarket be better?

Can I have higher compression and still go to stock redline?


what else can i do to build it a little better? Thanks to all that reply!

 

If you want to go really high compression like 11;1 or 12;1 go with the je pistons. But I would also advise getting aftermarket rods and acl race bearings.

type r cams have slightly bigger lobes than the gsr but if you are going for a straight track car go for stage 3 aftermarket cams. If you want this motor as a daily I wouldn't go above stage 2. Type r cams are great for DD but a lot of people ask too much like 350 which then you would only have to spend 150 more to get most stage 2 cams.


I have an lsv ( b18a1 block with gsr head) that has 12;1 compression and rev to 8. Stock head stock rods itr rep pistons bored out 81.5 mm and block has been decked. so you should be fine with the rev limiter. When you get a time your tuner will tell you your best rev limter.


I would recommend getting a CSS put in. NOT a block guard. A lot of people think these are the same. They definitely are not. I would also recommend as I said aftermarket rods and bearings. If you go with aftermarket cams you need dual valve springs and retainers or you will float a valve. That's why I have a stock head. My best idea is to do it all at once since the valve are coming out anyways I might as well put aftermarket ones in. There are ways around to putting in new springs and retainers without taking the head off the car but I haven't tried it. I might try it out though.


well best of luck with your build. Would love to see some numbers after its done.

 

forget the block guard or css for a mild all motor build.

take your GSR. if you want to use the stock rods. get some ITR pistons or something pressed on. (do not use ctr with the gsr head)
With the ITR pistons your compression will be in the mid 11s i believe.
throw some Type R cams. And valvetrain. rev to 9. have fun with a car that in a crx could go 12s.

 

When building an engine the overall setup really depends on what the final goal in power is and what the car is to be used for...dd, road race, drag race...once you get that figured out it is much easier to determine the setup that will suit your needs best.

 

No need to rev that high, wont make power up there. Just un-needed stress.
If you want a high comp GSR motor look at P73-00's or P30's if you keep the bore stock or at 81.25. If you go 81.5 or 82 look into PR3's.
82mm GSR w/ PR3's and some tuner 2's would be a fun DD.

 

i had the pr3s in my gsr. ran great. 13.7@ 101.(had more et in it).

I revved to 9. but for some reason that was wear the motor wanted to shift back into its band. it was just the sweet spot.

 

My last 82mm GSR ran similar numbers as well. I never got to hit the track with my last setup (custom grind "pro tuner 1.5") before my car was stolen but my last run on ITR cams was 13.91@ 99.8. That was in my 93 ex coupe, 2600 lbs w/ me in it. She was a hog. My car fell off power at 8k, I ran the P30 IM and I shifted at 8500 to stay in range. Depends on each setup, they will all be different. Cams, intake, header, transmission all play a huge role

 

heck i was on stock cams. 82mm gsr. pr3 pistons. bolt onss in an integra.

 

Itr pistons,

 

My usdm gsr with jdm itr cams Jdm itr trans went 13.70@104 with out opening the motor just bolt on's stock usdm itr header. Simple fun street car.

 

We aren't turning this into a cyber-race. If I wanted to start a pissing match I would...but we all know how people get about v8's on here

Anyways OP back on topic. Your best bet for pistons is going to be JDM ITR's or P30's if you are looking for the most compression safely. Determine your uses and goals and report back

 

USDM ITR, JDM ITR, PR3, or P30 pistons all work great. However CTR B16B PCT pistons are a no go.

 

I recently ran into similair questions.. i did the same build but in my em1. i got the type R pistons, acl race bearings, but my rods are stock gsr. b16 head race port, stage 3 concept cams, supertech valveterrain, aem cam gears.. ect.. the top end is pretty nice not to good from the jump, since im stock on my rods we kept it roughly at 180hp with only 123ft/lb torque estimated at 195hp if i wouldve replaced my rods.. but since i didnt i chose to remain on the safe side.. and in my non gutted coupe, i work alot of b20V builds, BRZ, rx8, WRX like cake.. my opinion tho go JE

 

no need to rev that high? mine does 9500 at 81.5 bore, i am satisfied with my cars power but if i could go back i wouldve done it different -___- well now time for another build and try to get rid of my em1

 

Bore has NOTHING to do with where you rev your motor to. Educate yourself beforeyou try calling me out. And in response to your post before, rods have nothing to do with hp either. If the motor you said you had built in that post only made 180whp...well spinning 9500 REALLY wasn't doing anything.
You can rev any motor to 9500, doesn't mean its doing **** up there besides burning gas and stressing out.

 

I plan to use as a daily driver and drag once in a while. I want it to be a fun and fast street car.

what pistons should i use?

ITR
PR3
P30
JE
P73

Thanks for the info guys!! You really helped a lot and I hope to put pictures of my build on here for people to see my progress!

 

Pr3's are a really good choice for what you are going to be using the car for.

-Eric

 

OP, I just finished a similar build for my CRX. It was a semi-budget build, I used PR3 pistons on stock rods with ARP fasteners, reused the GSR head with a multi angle valve job, aftermarket springs and OEM retainers and Edlebrock 4730 cams. It runs very well, considering it's got an LS transmission on it right now. With the head decked .005" and those pistons, zeal shows it to be about 11.5:1.

 

Sorry, I forgot to add this.

Would PR3 pistons handle nitrous or would I have to get after market pistons?

I would only use nitrous in a race and I plan to race very little. Would I have to go with JE with 81.5 bore and 11.5;1 compression?

Thank you very much guys!

 

What - in THE **** - is your DUMB *** talking about!?

 

Lmao

 

LOL clean rice put my thoughts on blast. Try calling me lout with a post like that? HA

 

I'm not calling anyone out! This is my first build and I'm trying to learn! I'm not that experienced!

 

I think the PR3's will be ok on spray as long as your tune is right. If you detonate, a cast piston is more likely to break a ringland or something than a forged one. I plan on about a 75shot on mine for when I go to the drag strip.

 

Not you, the other guy who was talking about rods making power