esurds

hey I've got a B16 with higher compression then normal. When I do a compression test I get 240psi straight across. I was wondering if with a good tune of course, If I could boost it with the boost just turned down, like 5psi? Or would that be a bad idea? Let me know what you think. Thanks

szczerbanator

Thicker headgasket, lowers the compressions. If your asking if youc an turbo it, yes.

esurds

Ya I'm pretty much wondering if even with the higher compression if I can turbo the motor with just low boost and a good tune. What would be safe psi for a B16 with 240psi compression

v8killaaaa

I have seen b16's with stock internals boosted at 7-10lbs comfortably, just get a good tune.

Im not saying its a good idea, because regardless you have a high compression motor and adding any type of forced induction will put extra strain on the internals.

But possible, and fun.

esurds

So what sort of psi boost should I be running with a motor like this?

es01civy

Get psi out of your head. Its the size of the turbo thats gonna be the determing factor.

esurds

How about a gt25r

es01civy

We dont even kno ur setup... High compression from stock.... so what is it?? 10.5:1, 12:1, or diesel comp at 18+:1..... Research look at compressor surge charts. They will help alot determining what turbo to use for your power goal and efficient as possible.

v8killaaaa

Reardless of your setup you dont want a crazy big turbo. You want something that spools fully at 5k revs. Give or take. B16's already got top end.

http://www.squirrelpf.com/turbocalc/

This is a pretty cool tool to use, if you can learn to use it properly.

esurds

What would you recomend for a b16?

v8killaaaa

Research my friend.

https://honda-tech.com/forums/showth...tock+b16+turbo

esurds

Thanks. I appreciate the help. I'm just having a hard time deciding whether I should go all motor or put a little boost into it

v8killaaaa

6 to one, 1/2 a dozen to another.

Im personally an all motor lover.

newtron63h

ok first of all the number you get on a compression gauge cannot be turned into a compression ratio. so 240psi means nothing when trying to figure compression ratio. to answer your question YES you can boost a high CR engine.........it will need to be low boost AND you will need a VERY good tune and you will probably need to use higher octane fuel. let me stress again that you need a VERY GOOD tune. if you dont have this you run the risk of running lean and tearing things up.

to es01civy: you are right to a certain extent BUT boost pressure means ALOT too. the pressure in the cylinder is what determines what octane fuel you have to use on a carb or port injected engine.

the size of the turbo determines how much air volume it will be pushing through the engine. both need to be considered when selecting a turbo, BUT in this case he needs to be more worried with pressure than volume.

as an example, a stock B16 with a turbo running at 5psi at 5000rpm is flowing xxxxliters per minute of air. now the same engine with a turbo twice as big running at 5psi at 5000rpm is flowing the same amount of air because the rpm is the same and the boost pressure is the same.

where turbo size comes in is in your higher rpms when a smaller turbo might not be capable of moving enough air to sustain boost pressure in a b16 at 9000rpm. BUT what you run into is that a big turbo takes longer to spool up, a small turbo cant feed the engine........so if you are looking for a dyno queen then its simple, put a big turbo on it and you are good. but if you are looking for a balanced engine then you have to find the middle ground.

andoxviii

iTrader: (1)

Generally speaking, engines can sustain a certain HP under forced induction. Whether that is done with a small turbo running higher-boost or a big turbo running lower-boost, is up to you. The smaller turbo will spool quicker (hence more fun for daily driving) but will heat up a bit. The bigger turbo will spool slower, typically a better setup for a drag car or high-HP daily driver.

With your high compression engine, definitely listen to the guys above and get it dyno-tuned by a reputable tuner. It will be more fragile (but produce more power) than the same turbo setup on a low-compression engine, but that means you need to be careful and really know what you are doing.

The reason people love to boost the LS is because it has a much lower compression from the factory than a B16 (not to mention higher displacement, but lets forget that for a moment) so they could give it more boost.

esurds

Thank you newtron63h that was very helpful. Cleared up all the confusion. So do you think my motor could even be running high compression? Do you think it could just be a really healthy motor? If it is stock just really healthy motor, what sort of set up should I do with it? I like the idea of small turbo quicker spool. How much boost would I need to run to get 250whp. Or what is a safe hp on stock internals, if it is stock. I would obviously like to get the most out of the thing but it is going to be daily driven on 92 pump gas so what's the most hp I could get out of it with no worries of the thing blowing up ( with having a really good tune of course )

roadsqueegy95

im running a stock b16 in my em1, with a t3/t4 57 trim garret, at 11-12 psi im at like 270whp 180wtq, it would be more, but i have to small exhaust!

esurds

Do you think your running a safe build at that kind of psi? Or do you think that's pushing it?

newtron63h

i kinda doubt your engine is in that good shape unless its been rebuilt. so my guess is that you are running a higher compression...........BUT there are only 2 ways to figure that out. one is to take the head off and do some measuring. the other is to use a device that measures compression ratio similar to how a compression gauge works.

do you know anything about the previous owner?

newtron63h

the only way to boost you car without knowing the compression ratio is to start very low(2psi maybe) and slowly increase your boost til bad things are about to happen(a tuner knows when this is) then back it down a smidge.

RCurioso88

man, its gonna be hard to boost your motor if you don't know if its stock or not. Hard, but not impossible

esurds

My motor was rebuilt about 3,000 miles ago. So do you think it could just be really healthy? I am going to pull the head off to be sure I just wanted to know what was safe. I want to run my car with boost but I don't wantit to blow up or anything. I just want it to be a reliable daily driver

Jameezy562

well i daily drive my 1995 acura integra LS and im running a rebuilt b18b1 bottom block with a b16a head, forged pistons, new rings, new bearings, micropolished, and a new crank, at 10psi.

madracer

You can run a small turbo like a45 trim or a 57 trim and stock internals and be very safe, the psi don't mean anything really. The small 45 trim will take x number of psi to make 250 whp while the 57 trim will take less psi to make the same 250 whp. So basically just get the car tuned by a well know tuner shop and you will be fine. The B16 is know for 350 max, so i will tune for around 250 to 300 whp and be happy. I did it and prove it already and it ran in the 13 second bracket on the track with 11 Psi on a T-3 45 trim turbo. The was a daily driver and stil is for the last 2.5 years now and no issues.

So to answer your question yes you can boost your stock B16 on high compression and be reliable and happy with the performance. Just get it dyno tuned not street tuned.

hondaman991

Man honestly I wouldn't boost it if you compression is high. I have a friend who had a 10.75:1 on his b16 and he boosted it at 4.5 to 5 psi and it didn't last no more then a couple of months and trust me he took to to a very good tune shop they tried to tell him not to do it but he insisted. So its your call but on a lower comp b16 you regret it trust me. And plus your gonna want to turn up the boost if you run an N/A thats hangin with ya.