Compression Ratio

[azteggi]

sup guys,,

well at this time my car is getting worked on, i have a gsr with a 98 spec type r motor. i am getting new pistons and rods installed. including a mugen head gasket. with this setup i will be at 11.8:1 CR... anybody here running a similar setup? if so, can it still run on 91 octane with stock injectors? or would i have to increase the fuel pressure? any input would be appreciated

[RhdRicheeee]

have you bought a aftermarket fuel pump?

[Sparkles]

Have Joe locash tune it. He'll be able to tell you if it needs bigger injectors.

[onefst91hatch]

Have Joe locash tune it. He'll be able to tell you if it needs bigger injectors.

X2. i dont think you will need them if you gat it tuned. but i would do the fuel pump for sure!

[<3bane]

you dont need a fuel pump. ive seen 500+whp setups running the stock pump. its more of a precautionary thing.

[honduh_head]

yeah what he said ^

its not a bad idea to be over fueled than under fueled though

[allmotorgsr]

you dont need a fuel pump. ive seen 500+whp setups running the stock pump. its more of a precautionary thing.


500+whp? stock pump? ive never known of a stock honda fuel pump to support enough fuel for the upper 300whp range, do u have any proof threads or anything? im just curious.:blunt:

[azteamextreme]

x2

[comptonasskerry]

500+whp? stock pump? ive never known of a stock honda fuel pump to support enough fuel for the upper 300whp range, do u have any proof threads or anything? im just curious.:blunt:

for real man i think that a stock honda pump is only good till like 250 then u start to push it past the "safe zone" i would get one if u have the money its nice to have. and if u have a type r motor then u should have type r injectors which to my knowledge r a little bigger then stock b series injectors so i dont think it would be that. but if u want some and if ur going to stay n/a just get like some 350s and call it a day. if ur going turbo go like 850s and ull never have to buy another set of injectors and u can turn them down so yeah hope that helps but someone tell me if im right about the type r injectors being bigger i want to know for sure and not be giving bad info.

[*inFamous*]

my stockie worked fine for about 260whp then we bumped up for another pump as the OEM was dropping pressure sporadically.

310cc injectors are nice for N/A setups :)

[MOD's Spell Checker]

Ive never heard of Type R injectors being bigger. just another honda myth

[allmotorgsr]

Ive never heard of Type R injectors being bigger. just another honda myth



agreed. :blunt:

[SOHCsoldier]

i daily on 12to1 compression, you should be fine

[RhdRicheeee]

i daily on 12to1 compression, you should be fine

Thanks kasey

[onefst91hatch]

all OEM honda injectors are 240cc. but i agree with Ravi, 310's are nice for N/A setups

[SOHCsoldier]

all OEM honda injectors are 240cc. but i agree with Ravi, 310's are nice for N/A setups

nope, all b series yes

[onefst91hatch]

nope, all b series yes

well thats what i meant. is there any other Honda engine??? lol j/k

[honduh_head]

i daily on 12to1 compression, you should be fine

what injectors are you using?