SAQ

About 5 months ago i bought a 93 fd3s with 63000 km in excelent condition and perfectly serviced,since then i replaced a few things to increase reliability and gain a few horses.First i replaced ,the radiator with one from koyo(silicon hoses too)after that the precat with a Feed 80mm downpipe,the main cat with a racing one(100 holes,removed the airpump),the exhaust with an HKS super Dragger||.
Second phace, i ve upgrated the stock intercooler (and pipes) with a bigger one(also smic),changed the intake kit,and finally installed an APEXI PFC with commander. Two days ago i had the car send to a dynamometer, the results were very disappointing, 245 PS (179KW)/ 6813 rpm -290,1 Nm/4439 rpm-0.88 boost(0.95b over), most cars i hear with mods like mine usually produce about 290-300PS.
Beside that the car is running very well (except a small 4500rpm hesitation, probably caused by the vaccum hoses which need to be changed). The only thing that comes in mind is the high intake temprature the car had durring the metering ,about 70 Celsius( before that i was driving in traffic and running very hot), but still 40-50 horses less than expected i thing is to much.
If my English are not very good excuse me,(iam Greek) i hope you understand my problem please if you have any idea feel free to tell.
Thank you all.

Mahjik

iTrader: (1)

Did you "tune" the Apexi PFC?

SAQ

Yes we did ,same tuning is running on another car too and seems to be working ok.

SAiamNE

How are your boost patterns and compression?

SAQ

compression is 8,6:1 and the first turbine holds 0.83b and the second has an overboost of 0.98b and holds at 0.88b (iam not sure if i unterstood correct what you ment about boost patterns?)

crazyrx7

You do know that the 4500rpm hesitation is your transition to your secondary turbo right?

R.K.

SAQ

Yes i know that,from what i ve been told this is been caused from the vaccum hoses,due to heat they dont fit right anymore(planing to change all of them with silicon ones)










)

rajeevx7

iTrader: (11)

If the compression on all 3 sides of the rotor in both housings is good, and the same computer is running another car w/ the same mods to a higher hp...check for a leak somewhere in the piping. Re-check or replace all the IC/Turbo and throttle body connections. Using the stock Y pipe? Check that coupling out. Also run the car and trace the exhaust pipes for any leaks.
You are right, your car should have made more HP. Are you sure the dyno is correct aswell?

Raj

potatochobit

iTrader: (1)

Hmmm clogged cat comes to mind but u say u have a racing one with 100 holes. i dont know what that means LOL.


hav u dyno the car with the stock ECU?

SAQ

This is very interesting,let me start with the things i know for sure, yes im using the stock Y pipe and yes i had a leak betwin the cat and the exhaust the casket was missing that time do you thing this had anything to do?
Do you know where is the boost sensor installed? if ihad a leak somewhere in the ic pipes shoud nt i have deferent reedings ?
Yes i thing the dyno is ok.

Mr rx-7 tt

iTrader: (5)

Check your plugs, wires etc.

Make sure both turbos are operating correctly, you should feel the second turbo come on at~ 4300-4700 rpm.

Make sure your throttle plates are opening all the way.

SAQ

The cat is brand new and as less holes a cat has so much better is the flow (the holes in a 100 are much bigger than in a 200 or 400 holes cat)
& no i had nt dyno the car before.

SAQ

If you dont count the small hesitation just when the second turbo comes on i thing i feel it ok with power and holding.
How can i found out if the throttle plates are opening all the way ?
YOU SEE HERE WE HAVE A MUCH BIGGER PROBLEM THERE ARE ONLY ONE OR TWO GUYS WHO KNOW A FEW THINGS A BOUT OUR CAR

BigIslandSevens

iTrader: (4)

[QUOTE=SAQ]How can i found out if the throttle plates are opening all the way ?

Pull the intake elbow off and open the throttle at the throttle-body. Look at the plates inside and make sure they are open all the way. (Laying flat)

*RX007*

iTrader: (4)

hey saq this is alittle of topic but do You live in northern greece? cause i was there thist summer and a silver rx-7 passed me. and i couldnt belive that i saw one in greece. it was near meteora.

rajeevx7

iTrader: (11)

The 'throttle plates' are the butterfly valves in the TB. Search the forum for those.
Also, how are you measuring PSI at both turbos? Isn't your boost guage running off a manifold nipple?

SAQ

My friend im from Volos thats about 120km from Meteora so idont thing you saw my car there but we have more than 50 fds running

EFS.O

Tell your friend to the USA to send you a wideband sensor because "kaboom" is near your door....

SAQ

Would you like to be more specific?

EFS.O

You are running with an "untuned" PFC(every Fd behaves different even with the same mods).You are spiking to 0.95 bar with the stock fuel pump.You have no idea what your AFR's are.Maybe you are having ignition break-up.I suggest you to stay at 0.65 bar before doing enything else.I am on the same boat with you in terms of tuning,but at least i am not boosting higher than 0.5 bar.This week i am installing the inovvate WB and then MAYBE i'll start messing with the maps(wish me luck lol).

P.S post the dyno sheet!

SAQ

I dont have a clue anymore who ever i ask in Greece says a differend think , the guy who "tuned" the pfc says that up to this point the car with this setting has enough fuel and its ok to run this pressure,as for the other expert is easier to get an US visa from IRAQ than to get an appointment to check your car . Ihad enough with this people ,and every time i have to go to Athens which is not the best thing for my nerves.

EFS.O

Rofl thats why a wideband sensor will tell you if you are running rich or lean.Come for a visit when i install it and see it by yourself...