MidoriR

hey guys need sum siggestions on my turbo setup im gonna do...got a b18c gsr block that was just rebuild with usdm itr internals should be sround 10,6compression..thing is i got a jdm obd1 b16a head so i dont know the exact compression...what kind of a headgasket should i get and how thick ? im gonna use a turbonetics 50trim turbo and cast manifold..should i get a different mani ? i got dsm 450cc injectors and im planning a tune on crome .thanks

boosted_D

iTrader: (1)

With gsr block......us ITR pistons, and b16a head you will have 10.8:1 compression.

You should be able to safely make around 300 whp with the set up you are going to use.
The only thing that is sketchy is how high your compression is, use an oem honda head gasket and arp studs, just make sure you get a good professional tune and you will be all good.

0SpeedFactoryRacing

We have arp headstuds in stock right now if you need any. Let me know if we can do anything for you.

MidoriR

i was thinking a thicker headgasket because of
The compression but maybe not and 300whp that alottta power

EsotericImage

iTrader: (8)

Lets see the exhaust mani you plan on using

MidoriR

i forgot the exact name its not equal length its cast manifold..
I wanna get a better one tough..i got a stage 3 clutch..
But should i get an oem headgasket or thicker ?

boosted_D

iTrader: (1)

I'm curious what this has to do with the subject? Any turbo manifold will work fine for 300 whp, just don't get ebay tubular cracky Chan and your fine.

And OP, personally I would use oem gasket, you can lower the compression with a thicker one, but they are leaky junk. A good tuners can safely tune a 10.8:1 motor, but tune is key with this set up, no base map bs here, you need a good tune

0SpeedFactoryRacing

I agree with boosted D oem headgasket is the way to go.

EsotericImage

iTrader: (8)

Theres many reasons why. your boosted, i shouldnt have to point out the differences to you.

boosted_D

iTrader: (1)

LOL, yeah your right, there are many differences between turbo manifolds, as far as flow, reversion, back pressure, and contamination go......NONE of which has any bearing at all on the subject at hand.

Litterally ANY manifold will suite a 300 whp set up, and the manifold has nothing at all to do with his high compression ratio, and rather he should use a stock HG or a thicker one to lower compression....Just saying

racebum

jdm gsr has 10:6-1 with a p72 head. a pr3 head brings that down, what? .2 or .3? if it's not shaved. compression should be 10:3-1 to 10:4-1

boosted_D

iTrader: (1)

Negative sir, he has a p72 block, p73 pistons, and a pr3 head, this equals 10.8:1

MidoriR

Thanks for all the help guys..i got it turbo now on a turbo gsr map until i find a tuner..
It is a gsr block with us itr pistons and a jdm obd1 b16a head..

racebum

i missed that second post somehow

CrackingVTEC

iTrader: (2)

I'm curious to why you say they are leaky junk. I'm Kinda in the same boat here on the high compression. I have a JDM B18C ITR. I have an AFI street set-up and about to boost at a minimum of 7lbs. My main concern at this point IS my compression ratio. I believe my CR is 11:1 and I would like to drop that a little because around here 91 octane is as good as it gets, but your post is making me reconsider because as you stated above about the "leaky junk" I don't want a leaky mess all over the place. So, my question is Thicker head gasket (and where is the best place to buy) or OEM with my CR.

phaphon

Your best bet is to either get another block with lower compression . Or get new pistons and rods or just new pistons

MidoriR

i did the turbo and like it..my compression is about
10.6 i got it tuned only on 6psi untill i
Upgrade my fuel but with 6 it made 221whp

MidoriR