Rx72Heaven

iTrader: (2)

Hey guys, before i get into it, yes i searched.

I Bought a car with a 3' Down pipe, 3' Mid pipe, and 3' Cat Back Apexi Dragger Exaust.

So far, i have yet to encounter any boost creep at all. I havent had any problems. Now im wanting to Get a Intake system on my FD, but will that enhance the proposal for Boost creep?

The way i see it now, my Car is like a Vacum, with a clogged Filter. So once i open that filter up (Intake Upgrade) Will that make it have a better chance to Creep, and Lean out the engine?

Any info into this will be much appreciated.

-Mark

Mahjik

iTrader: (1)

Is that an Apexi Dragger Exhaust or an HKS Dragger?

The reason I ask is that the original version of the HKS Dragger was more restrictive than the stock catback. If that's what you have then that is what's keeping your boost in line right now.

This guy had a similar setup:
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/dp-installed-no-boost-spike-creep-205544/

The HKS was holding him back as he switched to a Magnaflow catback and lost control of his boost:
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/fuel-cut-off-very-scarry-thing-225853/

Whether or not adding an intake in your case will increase the flow enough that its uncontrollable, nobody can tell you for sure yes or no. The question is, should you do it? IMO, no.

Rx72Heaven

iTrader: (2)

Yes thats what i meant HKS. Its a restrictive Exhaust? I never knew that. I get allot of backfireing, i beilve it was from the 3' from the engine back.

Wouldnt a Intake help for performance and just a better running engine?

bryant

do you have a boost gauge?
if not you better get one.
and a boost controller. just to be safe

supraturbo1987

iTrader: (4)

maybe your turbos WG has been ported and there could be restricting plates in the exhaust? I ask that beacuse you bought it with these mods and maybe they ported the WG which is why you aren't creeping.

Trev

Rx72Heaven

iTrader: (2)

Im not sure if they ported the WG. Any easy ways of testing it?

And yes i do have a Boost guage, and Alum AST. So with a DP, MP, and cat back HKS Dragger, i dont get any Creep.

Mahjik says cause the HKS Cat back is more restrictive or equal to a stock Cat.

Is getting a Intake a bad move on my part right now then? Or should i upgrade the ECU before i get intakes or any other performance upgrades?

-Mark

Mahjik

iTrader: (1)

In the least, get a boost controller before doing an intake upgrade.

Rx72Heaven

iTrader: (2)

Ok sure, what would be your recomendation for a Boost Controller?

And also, whyy would my car backfire? it dosent do it too much, just when i release the throttle sometimes. Is it just from the full flow exhaust?

Mahjik

iTrader: (1)

I'm partial to the Greddy Profec line, however just about any of them available for the RX-7 will do the job.


Rotaries expell quite a bit of unburn fuel (especially on a stock ECU). Since you have no catalytic converters, that's the unburnt fuel popping that you hear. If you just got the car, it would be a good idea to change the spark plugs. It will help a little with the excess popping but not completely. At least if you replacement them, you know they are good and you car begin to track your maintenance from then on.

bryant

man your fast no wonder you have almost 19,000 posts.

Mahjik.. good looking out for the rotary guys!!

dgeesaman

iTrader: (7)

No, not really. Boost issues like creep are something you need to be prepared for any time you make a flow improving mod. Intake, IC, exhaust, etc are all common flow mods. Boost gauge is how to know if you've created a problem.

Creep tend to happen on cars with full exhaust (downpipe, midpipe, and cat-back) and intake, or in a few cases a high flow cat if all the other flow mods are done.

Your stock intake and HKS dragger are probably enough restriction to cover for the presence of the midpipe. You need a boost gauge now, and to verify you have well controlled boost before adding other mods like an intake.

When you are ready to upgrade your intake, you will definitely want a boost controller in place first, and I'm guessing you won't get boost creep since you're running an HKS dragger.

Upgrading the ECU is not the solution to boost creep or boost spikes. Get the boost controller and boost gauge, and port the wastegate or add restriction if you get creep.

A ported wastegate and boost controller can handle just about any amount of flow mods you can throw at the car. You don't need an ECU if you are regulating your boost at 10psi.

The ECU is really for improving driveability and allowing you to tune for higher boost and the required fuel systems. It's only *required* when running more than 10psi boost. While tuning for higher boost can cover for boost problems, it's more expensive and less effective than a manual boost controller.

Dave

Rx72Heaven

iTrader: (2)

Ok, yea i do have a Boost gauge in place right now. And i don't get creep. So i should get a Boost controller, and some new spark plugs. Sounds good, and Thanks so much for all the help everyone, especially Mahjik, thanks so much.

Yet another question.

Ive noticed, i don't hit 10-8-10 in 1st gear, the highest i get is 6-7 PSI. All other gears are perfect. is that normal, or is there just not enough load in 1st gear to get a higher boost? Any info on this would be very much appreciated.

-Mark

FD3S2005

iTrader: (11)

i got the greddy type s controller and i love it .. very easy to use

Rx72Heaven

iTrader: (2)

ok, awesome. I have a few choices, ill have to figure it out.

Thanks so much for all the info guys! ANy one know about my boost issue, in my last post?

TRWeiss1

iTrader: (20)

To add to what the OP inquired, what's the proper way to set up a MBC for stock twins? I just recently started seeing some creep, and want to limit it ASAP. Figured I'd post the question in here rather than starting a new thread. Sorry RX72heaven, I don't mean to hijack, but I'm only asking this as I think you may want to know the answer as well.

dgeesaman

iTrader: (7)

Boost creep means it's time to port the wastegate.

Boost spikes or elevated boost levels mean it's time for a boost controller. Boost controller will not solve boost *creep*.

There is a good mbc install writeup in the FAQ. If you run a search you'll find even more options.

Dave

TRWeiss1

iTrader: (20)

Thanks Dave, I appreciate it! Well, it's looking like I'm going to have to port the wastegate.

Any good threads regarding proper removal of the stock twins (since I'm guessing they'll have to come off to get to the wastegate)?

Ahhh, nevermind...Found a couple good threads regarding removal of the twins.

Sgtblue

iTrader: (16)

Yes, that's normal in first gear. With your car at full operating temp, put it in third on a open stretch of highway with little traffic. Look around, if you see any Law Enforcement, shift to 4th and wait because you WILL speed if you continue. Once clear, start at about 3 to 3.5k rpm and then go WOT while watching your guage closely. You should see a 10-8-10 pattern.

Monkman33

iTrader: (28)

Either did some soft (or hard) time or prior law enforcement... or been around corrections officers a bunch.

or am I way off?

MADDSLOW

iTrader: (11)

God I hope so. Even with a ported W/G on stock solenoids, I have zero control whatsoever, even using the PFC. Buying an EBC soon...

MADDSLOW

iTrader: (11)

Anyone that lives near a city(at least on this coast) knows what that means. I hear it every day. I haven't used it once, though.

Monkman33

iTrader: (28)

Fair enough. I live in a smaller area, so when someone says that around here... it is usually due to being in jail or working in jail. Kind of a weird thing like that.

SLOASFK

iTrader: (5)

+1

Madd Slow, if you're getting boost creep even with a PFC and ported waste gate, have you tried those exhaust restrictor plates that the one guy on the forum makes?

Minor exhaust restrictions aren't going to hurt your power output by much. This isn't an Integra, if you lose 2 peak HP, it's not going to affect the car.

MADDSLOW

iTrader: (11)

I didn't try them, but I just bought an EBC. I'm hoping to have to use as few "restrictions" on the car as possible. I don't understand how my ported w/g can't handle it, and other people with non-ported w/g's can