I just installed the smsp header with a 2.5 inch kteller exhaust. Now my question is, what are the side effects if I don't get this tuned. I have got mixed responses, so just waiting to what you guys have to say. I have a 5th gen Prelude. I plan to do some headwork early next year. Some people just said that they'd wait till I get that done, then tune.


Thanks in advance.

 

the side effect is not getting the power you paid for.

 

do you "feel" the difference?

 

Stock ECU?

 

It won't damage the motor, if that's what you're getting at, but you won't see the potential of the header.

It's just like any header. If you want to squeeze a few pre-headwork ponies out of the $1,000 piece of metal you just bought, then yes, but otherwise waiting until you get the rest done won't be a big deal.

 

All I have right now is Intake, Header and Exhaust. I do feel a difference, and I know that without a tune I won't get all the power out of the header. Tuning is not cheap. I do have a stock ecu. I was told by one person that this header can damage the motor unless I tune ASAP. I do plan to convert to obd1 but not right now unless I have to, to prevent damage to the motor.

 

you need to slap that person in the mouth.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec &raquo;</TD></TR><TR><TD CLASS="quote">you need to slap that person in the mouth.</TD></TR></TABLE>

Violence is never the answer... but yeah you need to bust that guy right in the jaw.

 

+1.. those people suck.

I'm sorry, but you calling tuning expensive after buying an SMSP header is kind of silly.

I understand, but, you spent all that money and can't afford the $150 it costs for a chipped P28? Go to a dyno, spend $30 to get a baseline, hook it up with Crome Pro, and get some experience with it. Should save you money down the road.

 

I just don't want to spend money twice for the same thing a couple months apart. If I have to tune I will, but if I don't have to, I won't. I would like the money to go into the motor.

 

true statements.....wait till you get the port jobberz done....then tune...on the meantime get an appropriate ECU or Piggy Back (NOT Apex'i VAFC) Hondata, Greddy Emanage (if your SH), Chipped ECU with Crome or Neptune and tune upon completion of the headwork tune like your life depended on it.....

and do what Blake said....or take my advice, that "friend" of yours who said the header will damage the car....drag them out in the street and shoot them

 

You don't need to.

My engine only needed about 80% duty cycle out of my stock injectors for SMSP Header + exhaust, which should be in the range of what the stock ECU is doing.

Sure, tuning will give give gains (especially midrange), but your engine will be fine.

 

so there is no way I can be running to lean with this header.

 

Wtf? no.. lol

The header just moves air better, it doesn't magically evaporate the air to trick your ECU into thinking it's running rich to lean out.


FINAL ANSWER: No, you do NOT need to tune your motor. Would it be helpful? Yes. Will not tuning be harmful? Not in any way.

Should you tune your motor as soon as you do headwork? YES.

 

Ok, thanks.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Attaus &raquo;</TD></TR><TR><TD CLASS="quote">Wtf? no.. lol

The header just moves air better, it doesn't magically evaporate the air to trick your ECU into thinking it's running rich to lean out.</TD></TR></TABLE>

You're wrong.
Improving an engine's VE will cause a speed density car to run lean. An SMSP header is a good way to improve your engine's VE by a fair margin.

 

what does VE mean?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CaliLuder &raquo;</TD></TR><TR><TD CLASS="quote">so there is no way I can be running to lean with this header.</TD></TR></TABLE>

Only if your check engine light comes on. Your ECU will adjust the fuel mapping to the best of its ability. By tuning the new modded engine, you know that $1000+ in parts are working from before and after install.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by A Blue Lude &raquo;</TD></TR><TR><TD CLASS="quote">You don't need to.

My engine only needed about 80% duty cycle out of my stock injectors for SMSP Header + exhaust, which should be in the range of what the stock ECU is doing.

Sure, tuning will give give gains (especially midrange), but your engine will be fine.</TD></TR></TABLE>
You may want to grab larger injectors for your next tuning session.
http://www.injector.com/faq.php

"What do the terms “static” and “duty cycle” mean?
An injector in an engine turns on and off very quickly to control the amount of fuel delivered. The amount of time an injector is turned on and delivering fuel is known as the duty cycle. This is measured as a percent, so 50% duty cycle indicates that the injector is held open and held closed for an equal amount of time. When the engine needs more fuel, the time that the injector stays on (its duty cycle) increases so that more fuel can flow into the engine. If an injector stays on all the time, it is said to be static (wide open, or 100% duty cycle). INJECTORS SHOULD NOT GO STATIC IN A RUNNING ENGINE! If an injector is static in a running engine (open 100% of the time), that injector is no longer able to control fuel delivery. It is just “along for the ride”. This could be an indication that the injector is too small for the needs of the engine. Injector duty cycle should usually not exceed 80% in a running engine at any time."

 

Volumetric Efficiency?

http://www.epi-eng.com/ET-VolEff.htm

 

lol of course putting a better flowing heading on the motor will make it run lean....at WOT the stock ecu will not be able to adjust to make it run perfect

safe? yes
optimum? no

my rmf header setup puts my injectors at 100% duty cycle at some points.....i really really need to get some bigger ones....

 

you can always run just a bit more fuel pressure.

 

bb4ever is right, during part throttle you are running open loop where your ecu goes by your fuel maps and is corrected by the your 02 sensor, but during wide open throttle your ecu looks only at the maps. please correct me if some of this is incorrect.

 

i wanna see pictures !

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tegman85 &raquo;</TD></TR><TR><TD CLASS="quote">bb4ever is right, during part throttle you are running open loop where your ecu goes by your fuel maps and is corrected by the your 02 sensor, but during wide open throttle your ecu looks only at the maps. please correct me if some of this is incorrect.</TD></TR></TABLE>

 

i gained 15hp with the header installed, and then another with 10hp tuning