ahad

heyy...i recently got 99spec twins in...had a loose vacuum hose which was causing the boost to drop...neway got that sorted out now im getting the required boost but in 2nd and 3rd somewhere between 5-6k the car has some serious hesitation for almost a second its as if i took the foot off the pedal and then floored it again...any possible guesses? could be the plugs?

ahad

anybody?:P

ahad

come on guys i need ur help! i got my *** handed to me by an evo with a weak clutch cuz o this hesitation..beat by abt 3cars!

Wild7

Should of gone single...

I know. I'm an *******

DJRcustoms

Check the actuators, if they are sticking it might cause a problem.

Check this site as well, might help.

http://autosportracetech.com/RX-7/Tu...leshooting.htm

ahad

bro if i had the money...sigh...if i had the money...

samad

iTrader: (1)

just get a power FC duuude! DUHH!

dgeesaman

iTrader: (7)

What is your boost at when it cuts out?

Dave

ahad

around 11-12psi...




@samad: you've become one of THEM

TpCpLaYa

iTrader: (10)

id say ur hitting fuel cut

TpCpLaYa

iTrader: (10)

u cant run more than stock boost(if u have stock ecu) just because u put different turbos on(better ones)

ahad

i knw thats what i think it is too but how come it doesnt happen in all gears then? couldnt it be a case of fried plugs? and ive got an idiot of a friend who's running 20psi on stock ecu why doesnt he get a fuel cut?

fendamonky

iTrader: (6)

20psi on an RX-7 with a stock ECU???


Yeah, I'd say you need to get a better ECU. Not only will it improve performance, but it is MUCH safer for your engine. If you go the PFC route try to get a series that comes with the "Base Mod Map", it's one of the newer series PFC's and is good to about 13psi taken into account that you are running most of the standard bolt-ons.

Dudemaaanownsanrx7

iTrader: (23)

first gear isnt long enough for fuel cut at those boost levels, engine load is highest around 5-6k. if you keep racing your car without either changing the ECU or lowering the boost you WILL blow your engine.

Is your friends car an FD or an older car? If its an FD he doesnt have the stock ecu or he's not running those boost levels. 20 psi will definitely cause fuel cut. If he's running the stock twins @ 20 psi i doubt his turbo's or his engine will last much longer.

either way regardless of what your friend is doing, YOUR engine is hitting fuel cut and its cheaper to get a PFC then it is to rebuild your engine, which is what will happen if you keep racing it like that

samad

iTrader: (1)

well this ediot of a friend isnt running 20 psi cuz he wants too...my stock ecu was fried...only other option i had was a knight sports ecu. anyway i havent had time to diagnose my problem but im guessing thers a prob some where in the seq system.

when i get time im just going to go non-seq and get a boost controller! that shud fix it!

and its kinda weird cuz once i make 2-3 runs and the cars warmed up more..its back to 10 psi but its very sluggish after 6k rpm. weird problem!

(aur tu goroon kay samnay zyada cool na ban ahad!!)

ahad

hmmm what ill do is set the boost at 10psi lets see what happens....man i need 13psi its too slow at 10psi...i dont knw what it is maybe its the roads or the quality of fuel but on the net u see almost stock fds beating evos where as at 13psi all i cud do was manage abt 2 cars behind an evo7 with a not so hot clutch...sigh...


(hai oye samad bara tu emotional hogaya hai goron kay saamnay!!! hahahaha)

fendamonky

iTrader: (6)

I'd be very concerned about the health of your engine if you are running outside of what boost your stock ECU is mapped for, AND you have dodgy fuel..


Random question, your side conversation, is that Pashtu?

ahad

man the engine condition seems alright...none o the typical symptoms of a weak engine... best fuel u get here is 91 octane whcih is what i use...jus that the FD is not respected in the racing scene here so i have a point or two to prove...i just dont get why our fds are so slow compared to the fds all over the world...


as far as the language goes...haha im impressed u even knw what pashto is...im a pathan so i speak pastho but my friend samad is a punjabi so he doesnt get pashto...we're speaking in urdu which is our national language :P

fendamonky

iTrader: (6)

Elevation. If I remember correctly from when I was in Kabul it's like a mile above sea level (I know, totally different countries, different elevations), I don't think you are that far away elevation wise. Thinner air (was getting 1/4 LESS oxygen than what I'm used to) means more work for the same compression. Honestly you won't prove any positive points if you push your car beyond what your map will allow. You will only mess up your internals giving the other bastards one more thing to point and laugh at. When proper tuning and boost control isn't available these car's are very delicate. Once all the weak parts are taken care of they are absolute MONSTERS, angry at the world! But until that point... you can't take irresponsible chances without the very real possibility of expensive consequences. If *nothing* else I'd look into getting an effective boost controller (you will probably end up picking one up later anyway) to limit your boost to 11.5PSI (as the MAX) until you can source a good piggyback or tunable ECU.

Doh!! I should have known =\ I spent the summer in Kabul, Pashtu/Pashto was the first thing that came to mind.. lol, I tried to learn a little bit, never really got past the basic greetings though =( All the Afghani's I knew either spoke English, or I had an interpreter near who spoke English.

ahad

hmmm interesting points i guess but prob is no such thing as a rotary tuner here and u can jus forget abt spare parts...i had to find 3 pairs of twin turbos to make one pair that wud actually work...that too in pesh (which is pretty close to kabul n slightly less dangerous) so im just not quite sure what to do with my fd right now...but i think ill set my boost to 11.5 like u said...sigh...

fendamonky

iTrader: (6)

Pesh river valley (as in Peshawar)?? It rings a bell...

I'd set the boost controller to 11.5psi at the upper limit (12psi is fuel cut).


If I were still out there I'd offer to filter parts in to you through me (shipping would be a HELL of a lot cheaper).

If you can get a hold of the PFC I would def do so. Do you know any Hawala's (though I would be hesitant to approach one, given the modern misconception..) who could get the correct PFC your way? (if you know one in the UK let me know, I will do what I can to get the ECU to them). From there I would def read up on the PFC subsection, there is enough there to at least give you a basic understanding on how to correctly tune (yourself) the 7. Though, honestly this would require a Datatalogit and a true Wideband AFR readout as well.

Let me know, I'll try to do what I can to help out.

bryant

depending on what model evo you should be winning.

i would also do a compression check to insure how good the motor is internally.

RX7LINK

iTrader: (3)

what are your mods? from your brief description my guess would be

1. ur leaning out at some point from the 99spec turbos at high end on OEM ECU
2. plugs going bad
3. boost/fuel cut

nobody can run 20 psi on stock ecu. not even more than 15 w/out an aftermarket ECU and upgraded injectors and a good tune. motor will blow before that

bryant

good post

fendamonky

iTrader: (6)

Even with tuned ECU and injectors you will need some upgraded cooling (beyond what a SMIC can provide without A/I) before you can safely tap anything above 15-16psi. Intake temps will simply run too high, that was the problem I ran into last week while I was getting mine tuned. GReddy/Trust SMIC just wasn't enough to keep cool at 1.1 bar, everything else was brilliant! Just that the temps were running too high (ran 20 sec or so on the highway this morning boosting at 1.1 bar, jumped from 19 deg celcius to 45 QUICK (with an ambient temp of about 9-11 deg), would have gone higher but I was already at 150mph'ish and figured enough was enough).

Never had problems with cooling until I went over 13 (ish) psi..


I had mine tuned for 16psi, running a Bosch 044, FPR (@50psi base) and 850/850 injectors I have PLENTY of fuel for 16psi, just the cooling isn't there...