my buddy has a 92 si prelude with a jdm h22 and a t3t4 turbonetics turbo kit when he first dyno the car it was at 260hp on 9psi then we put wisco low compresion pistons eagle rods and the whole bottom end built. when we took it back to the dyno we only pushed 230hp on 11psi how did we loss hp?

 

Why would it make more power with a built bottom end?

Do you guys know what you're doing?

 

How low compression? 8.5:1?

 

what all took place in this bottom end rebuild. if you put lower comp. pistons in the block and do not turn up the psi the power will go down.

 

I had a similar problem this one time.

I took this crappy *** ghetto FMU turbo setup to the dyno and made like 400vtak.

Went street racing and blew the rings so me and the mad scientist tore the block down and put low compression pistons in derr and forged **** b. It looked m4d tite. But then we got it back on the dyno and only made like 250.
I think the NOS wasn't hooked up right or something.....anyways long story short I went racing again, this time for pink slips (and respect) and lost my car. damn.

 

maybe the turbo and VTAK timing are off =P

if you lower the compression your going to lose power if you don't up the boost

could be a million things, weather, different dyno

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">
crappy *** ghetto FMU turbo setup </TD></TR></TABLE>

lol, I think you called it matt.

 

less compression = less power

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">I had a similar problem this one time.

I took this crappy *** ghetto FMU turbo setup to the dyno and made like 400vtak.

Went street racing and blew the rings so me and the mad scientist tore the block down and put low compression pistons in derr and forged **** b. It looked m4d tite. But then we got it back on the dyno and only made like 250.
I think the NOS wasn't hooked up right or something.....anyways long story short I went racing again, this time for pink slips (and respect) and lost my car. damn.</TD></TR></TABLE>

HEY HEY HEY!!! EVERYONE LOOK! Man this guy is ******* funny huh?

And you try to rip me a new *** about being worthless on this site?

 

What kind of engine management are you using? Did you even re-tune it after the motor was built?

Lower compression does = less power, but he lost 30hp AFTER he turned up the boost 3lbs.

Sounds to me like either they tried to reuse the old tune settings, or..as mentioned, they are using a FMU (especially since there was no mention in the topic post about tuning at all).

 

i agree with blake. adding a turbo is like upping the compression. so obviously when you lower the compression you will lose some power. lower compression only makes it a bit more reliable and easier to tune.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TylerC161 &raquo;</TD></TR><TR><TD CLASS="quote">

HEY HEY HEY!!! EVERYONE LOOK! Man this guy is ******* funny huh?

And you try to rip me a new *** about being worthless on this site? </TD></TR></TABLE>

the difference between him and you is that he actually knows how to contribute valuable information, you on the other hand have 90% reputation and ask retarded questions without searching.

i find him very funny

Anyway, there are many factors in why he lost power. Did he use he same dyno? where the run conditions the same between them?

What kind of main and rod bearing clearance did you use? if they are too tight, you will for sure lose power from frictional losses.

 

give this thing a shot, and see if you raised or lowered your compression


http://www.rbracing-rsr.com/comprAdvHD.htm

 

that is totally reasonable..you dropped from 10.6 to 8.5 (huge drop) and lost about 4-5 hp per lb of boost. the good news is now its much safer for you to run higher boost levels, though you really don't have to go that low

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">I had a similar problem this one time.

I took this crappy *** ghetto FMU turbo setup to the dyno and made like 400vtak.

Went street racing and blew the rings so me and the mad scientist tore the block down and put low compression pistons in derr and forged **** b. It looked m4d tite. But then we got it back on the dyno and only made like 250.
I think the NOS wasn't hooked up right or something.....anyways long story short I went racing again, this time for pink slips (and respect) and lost my car. damn.</TD></TR></TABLE>


LMFAO

 

He didn't say his CR.
He didn't give enough info to help H-T help him...

 

+1 ... but most likely the lower comp pistons.

 

well he said jdm h22 which is at least 10.6 and wiseco only makes one low compression piston, 8.5...unless he got them to custom make them.

 

Oh, well.. You have stored info on those specs..
I'm on my last two weeks of this semester so I'm all drained from doing school work and getting ready for finals..

Well, still would help if he confirmed more info... Didn't give enough..

 

actually i'm currently running those pistons...

 

i dont know matt at all, but from his posts, seems like a decent guy. kind of reminds me of jesus. tells u how to fix ur problem but doesnt spoonfeed it to u, good learning. i mean u can hate him all u want.. but i haven't seen any diarrhea(false info) come out of his posts so yeah. (except for this one time about a LSD in a stock housing) for me, i respect the people that have been in the honda game longer than me unless if they're super duper kamehameha out of line. and lets all not e-thug

from what ive read up on turbos that seems dead on.. lower comp +higher PSI is how u make #'s. hours and hours of reading builds, wikipedia + howstuffworks.com.

 

hey dude, that LSD is no lie, it is definitely sitting inside an m2f4 casing and I've driven it for 20k miles....I don't really know about how it happened or even where it came from but its there somehow, I still have no idea what car the LSD is from either....who knows

You guys make me feel warm inside.

Now, would everybody excuse me while I go put some more water in TylerC's momma's dish.

Now, to be "on topic" if you guys so wish. You lose power when you use less compression, if you could do it safely, you would still want to have a high compression ratio in addition to the boost in the cylinder, that would make the most power.

You have to lower compression because when the pressure in the cylinder gets that high (because of high boost) you risk detonating. If you go down to 8.5:1 you're going to lose a lot of power that you now need to make back up by getting more air into the cylinder, whether that comes from more boost or the same boost level but flowing more air, it has to be done somehow.

So, without changing anything else in the setup, this result is perfectly understandable. Also, the heavy duty forged internals that are sold for turbo apps are a good bit heavier than stock parts, which is another factor in losing some power, because it will eat up a good bit of torque up top, which will show an even bigger loss in hp up there.

Anything else you would like to know tyler? Shall I state the already stated again or point you towards the search engine.

 

Since no one asked: Did he sleeve the block before putting those slugs in? If not, I can tell you exactly what your problem is.

Otherwise, if the build was good, I'd say freshen up the tune, add some TIMING and dyno it again.

 

saab recently introduced a European model with 11:1 compression and a turbo running E85

 

aww c'mon lets all be a family and stop the hate. after all we have the same babies. we're all proud parents. mothers are the people who baby their cars, fathers are the ones that beat the **** out of theirs.