StellarZ

My car has run fine until this point. Last night I raced 2 Supras on the highway to about 140. The car ran beautiful... strong as ever. I then get off of the highway and all of a sudden the car has a hard lope to it at idle... kind of like a cammed out V8 car or something. So I take it home and let it sit overnight. Fire it up this morning and still the same problem. I also noticed after I got off of the highway a slight exhaust leak that was not there before... maybe a gasket between the turbos and DP or between the DP and MP. Could this contribute to the problem in any way? The only other problem that I had today was in third gear when I wrapped it out to 8000rpm and the 2nd turbo NEVER kicked in. WTF?!?! Any ideas? Anything at all would be appreciated. Thanks.

By the way I have a 93 R1 w/ full exhaust and pushing 16psi of boost.

evot23

iTrader: (17)

Are you sure you didn't blow a vaccuum line off somewhere when racing the supra? 16 psi is a lot of boost! Exhaust leak shouldn't give you a bad idle.

Check your hoses...my boost sensor hose popped off recently and I ran like crap for idle and couldn't get any boost beyond the primary

ZoomZoom

iTrader: (2)

well you may have popped off a vacuum line but you might want to also check to make sure you have a metal intake manifold gasket. The paper ones (originals) blow out and cause the idle to get lumpy.

GoodfellaFD3S

iTrader: (213)

Try the boost sensor on the driver's side firewall near the steering wheel. There is a hose that attaches to the underside which frequently blows off.

Also, what kind of ecu/fuel mods do you have to be pushing 16 psi? Please don't tell me "stock"

StellarZ

Well this is pretty much the whole car... the way I bought it. I purchased this car recently and have not done any of the mods myself.
3K on new Mazda Motor -all new check valves and hoses
11K on twin turbos
New oil metering lines
New Fuel Pulsation Dampener
ACT Street performance clutch and pressure plate
Polished Plenum
Polished custom intake
Polished Greddy hard pipe kit
Greddy type S blow off
Polished Efini Y-Pipe conversion
Pettit Upgraded Race Radiator
Sequential Turbo Service (Vacuum hose replacement w/ ties)
New Secondary fuel injectors
New turbo control solenoids
Pettit AST
Pettit Downpipe
Pettit Midpipe
Greddy SP Exhaust System
Pettit Remapped ECU
Greddy pulleys

Maybe you have seen or heard of this car before... I bought it off of a member of this board. Anyways the idle is still REALLY rough. I started it up this morning just to move it out of the way of my other car and it was idling like ****. Haven't had time to check it out but I am really new at this so it would probably not do much good anyways. Anything else would be great. Thanks for the info.

borch2

The hose on the boost sensor popped off of mine last week. Same rough idle and bucked while driving. A little red hose and two zip ties and everything is just fine!

StellarZ

Well I checked the vaccuum line on the boost sensor and it is still there... all of the other vaccuum lines that I can sees are in place as well. Any other ideas?!?! Thanks

Marshall

comp check

SPOautos

This may or may not have anything to do with your rough idle but your Pettit ecu does NOT support 16psi!!!!!!!! You will blow you motor running 16psi with the Pettit ecu!!!!!!!

If the ecu has the unlimited chip in it (which it may) the MOST boost you can run is 14.7 with race fuel and 13psi on pump fuel!!!!

To run 16psi you will need a standalone computer system and new fuel pump and injectors. You also need a new intercooler to run more than 13psi, especially in the summer.

The turbo not kicking in will be a vacume line either cracked or poped off. The rough idle could be almost anything from a vacume line to a bad engine. I'd take it to the shop that did the vacume line replacment and tell them it just happend (play dumb) and they will prob fix it for free.

BTW - As a side note, how did the races go with the Supra's

Later,
STEPHEN

StellarZ

Okay... I cannot figure out what the deal is here. I cannot take the car to the dealer that replaced the hoses because it is in South Florida and I live in St. Louis. How can I mess w/ the boost manually?? I did notice that when I had the car on and was under the hood the motor seemed to have a slight KNOCK to it... BAD???? Car seems to be running extremely strong though. How can I tell if the motor is going?? It has about 5000 miles on it now. I have a warrantee that was given to the guy I bought the car from... REALLY hop it is transferrable if worse comes to worst.

As for the side note:
I taxed one of them who says he dynoed at 414rwhp and had about 1 car by 140mph on the other one who claimed to have 463rwhp. Scariest **** I have ever done!! MUCH respect for Supras!! The one I barely beat was having turbo cutout trouble earlier in the night and says he wants a rematch... so I will probably get taxed next time around, if my car ever runs right again.

Also my car was dynoed at 395rwhp, if this helps the diagnosis whatsoever. Thanks.

SPOautos

395RWHP!!!! That had to be with 16psi of boost!!!!! Are you SURE you only have the Pettit ecu??? If so this kind of boost and ecu is more than likely what blew the first motor!!!!

You said you have upgraded secondaries but with a Pettit ecu you should just be running the stock injectors. If I were you I'd get a Power FC from xs-engineering so they can tune it for your mods. You also need a IC

If you dont do those things, find a way to turn down the boost, you might have to get a boost controller. If Pettit did most of the work I would call them and tell them what going on. They are very good and can prob help direct you since they are familiar with the car.

Later,

JoeD

im pretty sure you can run 1200 secondaries and a better fuel pump with the unlimited ecu.

StellarZ

Anybody know of anyone that knows what they are doing in the St. Louis area??? Because I don't!!

Brad

Not trying to be mean bro, but maybe you should have thought twice about buying a car with THAT many mods when you know "nothing" about it. Honestly, I think you popped the sum-bitch. No way you should have been running 16psi unless you have standalone ecu...or your ecu with S-AFC and AVC-R and an upgraded fuel pump. Oh, and race gas too.

Good luck, I hope it works out man....

MOBoostFriendly

I also am in the st. louis area... there are not many people who can help you out on the rotary locally that I know of.

Not sure if you ever visit'd a web board of some locals, but you may wanna try that... there are some 7 owners who seem to know their ****. ( http://pub36.ezboard.com/f417importsfrm1 )

borch2

I know that Indy is a little drive for you, but there is a couple of guys that have a shop called AIM (Advanced Import Motorsports) that do great work on RX-7's. I was there on Monday and Pauly and Shane had no less than 10 RX-7's in their shop (All 3 gens).

http://www.aimindy.com/home.htm

Good luck!

StellarZ

yeah I have been on 417imports.com all day the last 2 days to try and figure out what the deal is... I found someone who is willing to help me w/ my car. Hopefully this turns out well.

the_saint

I had the exact same situation when I blew my motor.

Rough idle after a hard pull. =(

Everything is back to normal with a new motor, but the experience was one i could do without.

I hope that your motor is ok.


Mike

Viper jr

As soon as you get off of idle does the running rough go away? If it does, take it to your local Mazda dealer and have them do a compression check - *DONT* let them fix anything, you just want the figures from the compression check. Then at least you'll know if the motor is blown.

If the motor acts totally normal once you get off of idle, you probably broke a small piece of an apex seal off - which may or may not have damged the turbos on the way out of the motor.

And IF compression is low and IF its only running rough just at idle and IF once moving you're making perfect boost/power, I really wouldn't worry about rebuilding it right away unless the warranty covers it. I'd work on getting your high boost levels down or replacing the intercooler.

On the other hand, if you choose to rebuild it now, you might get lucky like when I had to do mine with the same symptoms and not have to replace anything other than the broken apex seal (my motor only had 8k on it) because your motor doesn't have a lot of wear on it.

DomFD3S

It could be a bad fuel injector.


Dom

airborne

I didn't see any gauges in your mods, do you have a boost gauge at least? A buddy of mine just had something similar happen. After some hard driving his idle went to hell. His boost gauge bounced at idle, and so did his A/F meter. Car still ran great under throttle.

Turned out the rear rotor had 2 cracked apex seals. Get a compression check before you do anything else. Also DO NOT run the car hard until you verify the motor is good. If you do have cracked apex seals you could wreck them entirely and send pieces of them flying through your newish turbos possibly wrecking them as well.

Also, 16lbs on stock intercooler? Lucky you didn't spontaneously (sp?) combust. But way to run those supras!

Seems like there's more than a few St. Louis guys on the forum, hopefully you can get in touch with someone.
Best of luck...

Ketone

Justin,if all else fails we have some people in the area who can get that rebuild done for ya almost for nothing.See you friday!

rtryrktrx7

Does it also put out a lilte back smoke when idling? I would double, and triple check your vacuum lines. I had one pop on me after a good run. It was one right on the fire wall more on the driver side. It popped off all the time. When it popped off it put out a little black smoke like it was running rich, and idled like a damn pro stock with a huge cam. It was actually hard to keep running but some how it did. Also when I blew an intake manifold gasket it had more of a surging idle, and would NOT accelerate quickly. I never had a problem with idle when I needed a rebuild, but then again my compression was very borderline. As far as all the mods you got...the others can help ya out. I never modded the hell out of my two 7s.

StellarZ

Eric, hey good to see you on this board!! I was going to put the new plugs in tonight so that way tomorrow we could at least get that part out of the question... but it is rainy like a **** so if it clears up a little I might get it.

Airborne, yes I have a boost guage as well as an A/F guage. The vaccuum is bouncing between 10 and 12 at idle whereas before it was at a solid 15.

Thanks for all the help!!!