Not to sound stupid, but is there a limit to how much boost I can run other than not running to lean? Single turbo is new to me and it seems like I could almost peg my 30lb. boost guage. Surely this cannot be right?

Ported engine
850/1600 injectors
Power FC
Pettit intercooler
GT35R dual bb turbo

Definetly different than the twins, car takes off like a rocket.

Just curious what others w/similar setup may run, boost psi wise.

 

Oh man... I'm waiting for the next thread: "I killed my car!". lol

Please be careful. Apex seals are listening.

 

If you are coming close to pegging you boost gauge at 30 pounds of boost and asking this question, I'm afraid you will blow your motor if you haven't done so already. So please don't drive your car any more until you can answer and confirm some basic questions. If you have a PFC commander you should be checking to see if the boost reading is close to what you are seeing on your boost gauge. I hope for your sake that your boost gauge is either way off or broken.

Secondly, is your car tuned for your single turbo setup? If so, by whom?

As far a the how much boost you can run a lot of factors come into play. More importantly the amount of boost you can run, and what you can afford to run are usually two different things. Mechanical limitations in regards to the amount of boost you can run depend on several factors.

 

Alright

Hooked up w/a new friend who lives a couple blocks from me and has a 1993 RX7 w/twins, PFC, intercooler, and some other goodies and we went cruisin. Anyway,
looks like my boost settles down at about 18psi or so. Power FC says my max rpm last night was 6190. My car will pull away from his fairly easy, but I'm thinking thats probably normal.

Is 18-20psi gonna be ugly?

Xavier at The RX7 Store set my PFC settings but we have not dyno-tuned it yet.

 

I'd turn the boost down until you can get it tuned. Do you have a wideband or EGT gauges? Are you still running the stock map sensor? What kind of gas are you using? Any kind of water or methanol injection? Do you have a Datalogit so you can post your map? I assume Xavier sent you a basemap for your setup?

 

I'm not very good yet w/the PFC but I'm learning. If I monitor boost it reads in mm/Hg. Now, best I can tell when my Autometer boost guage is 4-5pse the PFC reads +71mm/Hg. So I'm guessing my boost guage is a little off from PFC reading?

All Xavier did was go through the screens (w/o laptop) and make corrections that were obvious. At the time I only had 400miles on the car and I think he did what he did with the intention of me driving around w/some sense until he could hook up the laptop, wideband, etc. on the dyno.

I dont have a datalogit, but I have been seriously thinking about getting one. However some people have been telling me once its dyno-tuned I shouldnt have to worry about it? I am never getting rid of this car so should I get one?

I'm gonna get an EGT guage that has 2 probes, one for each rotor.
Xavier did say I need a 3 bar sensor, so I'm getting that.

Does the PFC use the map sensor to give the mm/Hg reading?

I tell you what though, I'm very happy w/the results so far. However, I dont want to have to pull the engine in the summer if I can help it so any advice would be greatly appreciated.

I need a datalogit huh?

 

KD-93R1 stop trolling.

71 mm/Hg (torr) = 1.373 psi

Are you watching the air/fuel ratio in anyway?

 

I know how to convert mm/Hg to psi. I am simply stating what my instruments are reading.

Far as I can tell my A/F ratio is good. I just wanted to know what people w/similar setup run boost-wise.


What the heck is trolling?

 

What is good?

 

I just read up on my Autometer digital "narrow band" AFR guage. Looks like its gonna be pretty much useless for my new setup. It says this thing goes into an open loop mode from 80% throttle up and just shows real rich as a kinda default setting. So that is NO GOOD.

I was thinking of replacing it w/Autometer UltraLite digital wide band one. Will that do the trick. Xavier at RX7 Store has mentioned "wide band" several times to me. Guess I'll get one of those. I was thinking of a GM 3 bar sensor too? Any opinions on these fellas?

Thanx for your help

 

Those boost levels should yield high 300-mid 400 hp on your setup tunes. With that amount of power you will need more supporting mods like the other have said.

turn down the boost via your boost controller or waste gate springs if you dont plan on getting tuned soon.

The PFC is usually off unless your map sensor has been calibrated. But if you press the up button while observing boost it will record the max boost to the right.

 

A wide band O2 would be a great investment. I paid about $300 for my PLX-M300 years ago. It works great and it has an output for recording the voltage. There are many WB02's out there...I'm not familiar with PFC but if it has the capability to data-log that would be good. The narrow band 02 is useless for tuning. I'd ditch it unless you like to watch the pretty lights...

Read this:
http://www.paceperformance.com/pacep...ndshootout.pdf

 

Ok, installed wideband kit. Heres what I got so far.

Just cruising in 3rd gear around 2700-3000rpm its reading mostly like 11.3, 11.4. However, sometimes it was reading mid to high 10's in same situation.


Got on it once, WOT appears to be reading low 10's like 10.2, 10.3. I wasnt running real high rpms though, dont know if that matters. Tried to in 2nd gear but car breaks tires loose at about 4700rpm. These BFGoodrich KDW2's are gonna have to go.

Anyway, are these numbers good, bad, and do I need to check the reading at higher rpm. I didnt go over 5100 tonight.

Appreciate your help.

 

You installed that WB02 really fast. When the engine is in vacuum it needs enough fuel to run smoothly. If it's reading 11.3, 11.4 during cruising when the engine is not making boost then you can lean it out. 10's is way rich even under boost and high load but I can't speculate about how much fuel the engine needs to make good safe power. You really need to see how much torque the engine makes and to do that it needs to go on a dyno and the timing needs to be adjusted. I'd say you have a good safe tune for now. Drive it cautiously until you're confident in the tune...

 

 

You need to get it on the dyno and tuned.

 

Your right Jason, its time. Zavier saw it a few weeks ago when it had a little over 400miles on it. Got the wide band now. I'm gonna need one of your 3bar sensors
dude. Paul and I were thinking about scheduling a day for you to dyno-tune my car and his. I should be ready in a couple of weeks. Everything you sold me is working 100% no issues and I am very satisified w/the set up you got me. You have always done my right and I'm anxious to see what you come up w/on the dyno. It would seem I have plenty of fuel and the engine seems like it just wants to run & run.

 

Aw man we were trolled. Nice plug for Jason...and you still have spelling errors.

 

PvillKnight7. Not meant as a plug, besides RX7 Store dont need help from me. I tell it like it is. Why dont you bring that car of yours to Columbus and I'll show you some real trolling. Its all good. Yeah, I seen the spelling error afterwards.
Knowbodies purfect dud.