kyrx7

my car has a large intercooler,downpipe,midpipe,catback. i had a apexi ecu and commander installed. but the place that was 4 hrs away didnt have a dyno and the shop that they usually use that has a dyno was broke. they told me to get someone with a dyno to tune it. my question is a friend of mine here in town has a shop with a dyno. he tunes alot of mustangs and turbo cars. he put a big turbo on a cougar runs like mad but what i want to know is with his experience with cars and tunning even tho he hasnt tuned a rx7 with the dyno,experience, and manual to the ecu will this be a problem for him to tune? and how much should it cost? and does anyone have any idea what kind of horse i should do with these mods. the rx7 shop said when i drove it home to not drive hard cause it is hitting 15 to 16 pounds of boost

cewrx7r1

iTrader: (2)

Non RX-7 experince: the only tuning he should do is AFR if the car has the corrrect timing map and you now your AFR targets.

Stock ports with stock turbos and all NEEDED supporting mods(fuel pump upgrade, 550/1200 injectors, plugs, ignition amp) at 15psi = about 350whp.

Your setup, about 320whp.

kyrx7

when its done i will let ya know what h.p. it hit

rynberg

Why am I predicting a blown motor thread?

dhcernese

Find someone who has experience tuning an RX-7 with a PFC, access to a dyno with a wideband o2, etc. If you have to drive 6-8 hours to get there, save up your money and do that instead of spending money fixing an exploded engine.

kyrx7

he has a dyno and wideband. so the rx7 is harder to tune than any other car? he is good at what he does and i dont think he will blow my car up. lol but he does have insurance at his shop so if he blows it up tunning it will be covered. lol

dhcernese

Re-read what Chuck said: if he doesn't know the RX-7 and PFC, then all he should touch is the AFR, presuming EVERYTHING ELSE is already nearly perfect *and* you know what your target AFR map should look like.

lilblucoupe

tuning the a/f ratio........ ultimately that is ONLY what a tune boils down to!!!! tuning a engine is tuning a engine, the computer might be different but the principal is the same!! timing tables very seldom need to be changed anyways. If your talking about speedydyno.com you will not find a better tuner east of the mississippi. He deals with more turbo cars than most people on this forum have ever seen, mustangs,eclipse,srt-4,cougars, and even a rx7.

cewrx7r1

iTrader: (2)

You are assuming that the rest of the many tables and parameters in the PFC are all ready properly set up. I have a recent PFC map from a respectful Aussie rotory tuner who is experienced with Microtech but not the PFC. It has obvious mistakes in it, and was not tuned with the DL. The large port single turbo engine is only making 370whp hp at 14.5psi and still has idle and cruise problems.

lilblucoupe

with a loading dyno (superflow)and a wideband you can see the glitches in the programs and know extactly how to fix them if you have any understanding about how the computer works, even if your not an aussie

rynberg

blah, blah, blah, tuning is only AFRs, huh? Timing is a very important part of tuning a ported turbo rotary....

As Chuck pointed out, there are also a large number of settings in the PFC that make for a smoother running car or a car that handles ambient or operating condition changes more consistently.

I would never take my FD to a tuner who has little PFC or FD experience, even if "He deals with more turbo cars than most people on this forum have ever seen".

EDIT - Speaking of AFRs, does this tuner even know what AFRs to be shooting for? This isn't a piston engine. If tunes for the low to mid 12 AFRs on pump gas, that motor is going bye-bye.

kyrx7

so what afr's should he be shooting for? if not low to mid 12's then what?

kyrx7

i just called my tuner and read all this to him and he says that u guys just make it sound harder than what it is. totally understandable since you dont tune cars for a living and he does. and yes he knows not to shoot for 12's he said thats a no brainer. but he assured me not to worry about it. and was wondering if you tune your own cars or pay someone to do it.

dhcernese

Good luck. Let us ignorant folk know how it goes.

lilblucoupe

im sure kyrx7 will let YOU know dhcernese. I guess you do all the tuning and work on your own car? doubt it, you probably never had your hands dirty. And rynberg i guess you know everything about these cars, so why aren't you the great tuner of the U.S. and aussie world, seems like to me you people just try to bash anyone who asks a simple question and treat him like the dumbass you are!!!! just calling it like i read it

dhcernese

Not that you deserve to be dignified with a response, but I suggest you re-read my posts and notice the clear and respectful tone; and the sarcasm in that last one. This morning I actually thought about composing a more detailed explanation of failure modes to look for-- and suggest that if your tuner did not know how to recognize these that you reconsider on that basis.

I was probably driving and fixing RX-7s before you entered high school. I couldn't resist, must be my inner child. Since you're new to these forums, I can understand you probably have a chip on your shoulder, but kyrx7 is not so new and seems to know how to ask honest questions as an intermediary with his tuner.

I think you and your buddy will get what you deserve without my involvement. Have a nice day. Any further retorts I will only respond to in private messages.

If you think that tuning an RX-7 is nothing more than AFR on these cars, perhaps you should read about all the blown engines that had perfectly acceptable AFR numbers. It's not about what you do when everything is working-- it's about how you recognize that something is not working correctly, and some of those symptoms are rotary-specific. See, I couldn't help but try to help, it's my nature.

rynberg

Where did I bash anyone? I'm trying to HELP the guy so he doesn't end up with a blown motor. Perhaps you should pick up Hooked on Phonics and gain some reading comprehension.

kyrx7

wow i havent been on computer since friday. had alot of reading to do when i logged on. lol so noone answered my question about what afr to be shooting for? my car does about 15 boost.

dhcernese

x

kyrx7

man that car runs so rich when i dropped it off i will just be glad it wont be burning my eyes at stoplights. question. will a car running to rich make it fall on its face when it takes off. it has no take off. of course ita a auto (dont give me hell its all i could find at the time) but it sucks on take off.

KBSRX7

Mid 11s up to 14.5 PSI

kyrx7

so i got it tuned. not making the hp i wanted. only 275 rwhp and doing 14 psi but it is a automatic. havent drove it yet. picking it up tonight. he said its alot better spools fast and nomore floodind and cutting out on take off. said the problem im gonna have is not burning the tires off. i still think it could do more hp but better safe than sorry. dont want to try and get more power and sacrifice it being safe. i dont think auto tranny can take alot of hp in these cars anyway.