What's about the highest safe compession I can run on a ls-vtec on pump gas ?

 

Highest safe or the highest usable without de-tuning ?

You could de-tune a 12:5:1 motor on 93 oct and not have any detonation issues, however the motor will be screaming for better fuel then 93 oct.

If your looking for a good all around compression ratio for a 93 oct bseries setup I would recommend 11.5:1-12.0:1 with an 81-82mm bore

 

well done said..^^

 

i did myne at 11.0:1. u could get away with higher. if you want to be safe....11:5:1 at max on pump gas will keep you from de tuning.

 

What do you mean by de tune?

Also what size injectors do you guys think ? Using s2s2 cams

 

Motor will be tuned ....I want the highest compression I can get on pump and then when wanted through 100-110 and get more power of out same tune

 

De-tune would be retarding the ignition timing to compensate for the compression ratio & fuel octane mixture, otherwise you would run into detonation issues.

Stock injectors are only good till around 195-200 whp along with the stock fuel pump.
I have seen stock fuel pumps give up at 195 whp on older eg hatches.
I would recommend a set of 310cc injectors along with a walbro in-tank fuel pump for the 1.8L ls/vtec you are looking to build.

That is not possible on one tune, you would need two separate tunes using dual mapping. One on 93 and one on the higher octane fuel. You would want to use the same exact fuel every time on the higher octane fuel as different fuels have different properties.

 

How can I seperate using dual mapping besides a piggyback? Is there another way?

I was hoping for 205-215 whp ...I have a set of 370Cc injectors is that over kill?

And thanks for all your help

Just rode in my buddy's hatch you tuned last week Lil sohc suprised me lol

 

Hondata s100, s200, s300, Neptune, eCtune all handle dual mapping.
370cc injectors will work just great for the setup.

 

Ok thanks for all your help you've been rep.d