MtnRacer

How much bhp can be made with the stock intercooler(not necessarily the stock turbo)?

How much(if any) is turbo lag increased by going FMIC?

Steve

13bpower

I'm not sure about HP #'s but I have hear the stock IC is useless past 12 psi, and not doing much past 10 psi.

madaz07

i have a stock top mount

DaleClark

iTrader: (55)

I don't recommend past 10psi on the stock intercooler, and past 12psi on the stock turbo. The stock intercooler is REALLY bad - it's designed to work OK at stock boost, and that's it.

You'll actually gain better response and more boost going to a front-mount - again, that stock IC is a big restriction. I was pleasantly surprised at the throttle response that I picked up going to a front-mount!

Dale

FC_Iria

Yeah the stock IC is pretty bad. When running higher boost it gets heat soaked pretty easily.

vmb

where are the pics dcfc3s?

DaleClark

iTrader: (55)

Uh, what pics?

Dale

TBoost

Steve,

I'll try to give you a more technical answer.

The stock intercooler is actually a great design, but in a bad place. You can make as much bHp as you can with any intercooler provided that the car doesn't see too much heat. The problem with the stock intercooler is that it is placed on top of the engine and then the scoop isn't well designed so that fresh air is going straight to it. Instead, the air it recieves becomes turbulent after a certain speed and the heat from the engine will rise interferring with that fresh air. The good side to the stock intercooler is that it will provide better spool-up and more boost pressure due to the inherent nature that its very close to the throttle body and doesn't have to travel far. By contrast, a front-mount intercooler is way downstream of the throttlebody and the moment you mount it, your boost pressure will drop. It will also drop because of the cooler air. You compensate for this by turning the boost pressure back up to the original setting. This increases power plus provides a cooler intake charge.

Turbo lag is not dependent on the placement, or size of the intercooler and has more to do with the size of your turbo and how fast your computer can inject fuel from the time you press on the gas to the time you get instant response (not full spool up).

Understand?

-M

MtnRacer

Thanks guys. Throttle response is very important to me, so if I went front mount, boost lag would either have to be at least the same or better than the stock mount. So nobody knows how much bhp can be safely made on the tmic? Sounds like it's under 300. =T

Steven

mrb63083

iTrader: (4)

What FMIC do you guys use? and are they actually "made" for the 2nd gen RX-7? Oh, and did it require a lot of work to get it in?

-marshall

adamlewis

Dont you know!? All that matters on this board anymore are the pics! Because I know I sure wouldnt want to add something to my car that would help is tremendously if it looked like crap! </sarcasm>

vmb

Dont you know!? All that matters on this board anymore are the pics! Because I know I sure wouldnt want to add something to my car that would help is tremendously if it looked like crap! </sarcasm> .......................f off sucka

i just wanted to know if you had pics of the intercooler install dcfc3s ! i have a intercooler without the piping and just wanted the pics as a refrence until adamlewis that doesnt know me starts writing crap !

hey adam

adamlewis

Oh wow...so mature. Really makes me want to help you in the future...

If you already have an IC, chances are someone here has installed it. Why dont you try doing a search?

TBoost

Did you hear what I said? Boost lag will be the same no matter what intercooler you put on.

Also, I wouldn't bet on that 300HP figure. I'm pulling over that to the crank. It depends on the turbo you are using, its efficiency range, boost pressure, and temperature of the outside air.

-M

scathcart

uh HUH...
How about the fact that moving with moving the intercooler piping, the turbo must first fill the piping and larger IC area before building boost?

TBoost

Once the intercooler is attached, the system is sealed and air has already become a continuous stream at idle. If it weren't the case, then the boost gauge (which is installed at the intake manifold) would be behind and you really wouldn't know what your boost pressue is.

Turbo lag is not how fast the turbo reaches full boost. Read the books... That is called "boost response". Turbo lag is really "fuel lag"..

-M

madaz07

i run 8psi stock that i use all the time only when i race i use 14psi and yes it does heat soak very quick when ive got my handset plugged it you can see the intake temp rise when you put your foot down on 8psi i have 190rwhp with a fmic i should get alot more power

Rpeck

I think there is somthing wrong with your car. The Mods you list above ... and your only getting 8 HP over a stock setup? The street ported motor alone should far exceed 8 HP in gains alone... not to mention the other goodies you listed. Um, whats wrong?

There is prolly some people on here getting ~190HP out of a N/A.

TBoost

I concur. Something is wrong with your motor, or you might have a "weak" car. You should be putting out a little more than that with a street port motor.

Granted your turbo is just a minor upgrade and is nowhere near as efficient as a bigger turbo at higher boost pressure so your intake temp will soar up there. But you should normally get at least a 40HP increase from 190RWHP @8psi to 14psi. To be honest, 210RWHP isn't all that bad. I think you are losing about 20-30HP somewhere that I wouldn't necessarily blame it on the stock intercooler.

-M

TBoost

Rspeck,

Your sig number for CFM on your turbo is bogus. What psi is this upgrade being run at to get 900 CFM?

I'm anxious to see what your 10th does on the dyno.

-M

Rpeck

I'm just going by the Webpage of the place I purchased the Turbo. I have the Stage 3 Upgrade. http://www.lourdsmusic.com/bnrsupercars/turbo8788.htm I don't know enough about Turbo's one way or the other, to say. Ya, I can't wait for the dyno either about a month away, I am still breaking my new rebuild in. I also don't have all my toys installed yet, half of them are sitting in the grage still untill I smog & finish the break-in.

TBoost

Hmm... you are in Stockton eh? I smell a race coming my way...

-M

Rpeck

I can't wait

scathcart

It takes longer to fill and compress a larger volume. The added piping of the intercooler bewing moved up front is the added volume. Think about an air dompressor filling a jar to 10 psi, then filling a 1000L resevoir to 10 psi.
The turbo has to move more air to fill the larger volume, thus, typically, you get boost lag.

Felix Wankel

But if those 190 hp NA's ran on a Dyno Dyamics (I think thats what he used, I've asked before) dyno, they'd have about 150 hp.