Here is a list of my engine modifications :

1994 Mazda RX-7 TT Touring package with 55 000 miles on it Red(original paint)with Black leather buy in Wisconsin fall 1999. (I bought only brand new parts,no used parts...)

-New Street ported and polished engine with 3mm Apex Seals with only 5000 miles on it ( Job done by Rotary Dynamics in Toronto Canada by Darryl)
-Freshly cleaned stock injectors ( 2x550cc primaries and 2x850cc secondaries) I shipped them to a shop in the US !!!!
-Stock Flywheel machined, cleaned
-New vacuum silicone hoses job done in october ( hosestechniques.com ) ( red color )
-Apexi Dual Power Intake ( RX-7 Store.net )
-Racing Beat air inlet duct
-HKS mild steel Downpipe 3''
-HKS Hi Power Cat-Back 3''
-RX-7 Store Resonated Mid Pipe 3 ''
-HKS Super Sequential Blow-off valve Kit
-Efini Y pipe 99 specs
-New battery
-Redline Water Wetter in the coolant
-New Greddy radiator cap 1.3 BAR
-Double Throttle Removed
-Airpump removed from the engine bay
-Exhaust Gas Recirculation Removed
-Fuel pressure solenoid by passed
-All fluids are new ( 10W30 Castrol engine oil changed every 1 000 miles ; 75W90 synthetic Quaker Stake in the transmission )
-New Fuel Filter with only 8 000 miles on it
-New Bosh O2 sensor with 10 000 miles
-Twin Turbos have been checked and cleaned by Turbos expert, everything is O.K. and still in good shape
-New NGK Racing Competition Spark Plugs Platinum( 4 x B9EGV ) * The plugs wires have 20 000 miles on them *
-Greddy polished intercooler piping kit 3 pieces
-Hard intake piping kit ( Gotham Racing )
-Engine management Apexi Power FC with Commander ( Boost is set to 13 - 14 PSI )
-Pettit Racing Rally Clutch Kit ( need to be install this spring )
-Greddy stock mount polished intercooler to accomodate my 12 to 14 psi.....
-Greddy Pulley kit waterpump and alternator
-ASI Polished main pulley
-RX7TRIX Gun métal AST ( air separator tank )
-Walbro fuel pump

June 4th My car is going to be tune by Steeve kan , he come in Montréal for the clubrxquebec.com . My objective (goal) with my car is to reach the maximum of the stocks injectors. I changed my fuel pump during winter season but I don't want to change my injectors. I read on rx7.com that the stock injector can support upward to 360-375 Engine horsepower at 85% duty cycle for reliability reason.

I would like to put a solid 325Hp at the wheels. Is that correct ? The only parts missing before my tuning is the HKS twin power ignition. I"m looking to buy one but not sure yet about the benefit at my boost level????

 

Sure, you can do 325 wheel horsepower, but you will be at almost the functional limit of your fuel injectors. I strongly recommend, with all the time and money you spent on this setup, that you spend the extra few hundred bucks for some bigger secondaries.

 

Once it's on a dyno lets us know. It would be a hell of a lot easier to take a stab in the dark if we didn't have to read through the commentary and the modifications that don't have anything to do with horsepower. (Fuel filter for example)

You shouldn't have any problem making 325.

 

1,000 hp

 

I was thinking the exact same thing as I was reading his post... lol

 

i say 320 due to your stock injectors and high flow cat.

 

Quote:
Originally Posted by the_glass_man
It would be a hell of a lot easier to take a stab in the dark if we didn't have to read through the commentary and the modifications that don't have anything to do with horsepower. (Fuel filter for example)



Is that correct like this? can you handle that ?

-New Street ported and polished engine with 3mm Apex Seals with only 5000 miles on it ( Job done by Rotary Dynamics in Toronto Canada by Darryl)
-Freshly cleaned stock injectors
-Stock Flywheel machined, cleaned
-New vacuum silicone hoses job done
-Apexi Dual Power Intake ( RX-7 Store.net )
-Racing Beat air inlet duct
-HKS mild steel Downpipe 3''
-HKS Hi Power Cat-Back 3''
-RX-7 Store Resonated Mid Pipe 3 ''
-HKS Super Sequential Blow-off valve Kit
-Efini Y pipe 99 specs
-Redline Water Wetter in the coolant
-New Greddy radiator cap 1.3 BAR
-Double Throttle Removed
-Airpump removed from the engine bay
-Exhaust Gas Recirculation Removed
-Fuel pressure solenoid by passed
-Twin Turbos have been checked and cleaned by Turbos expert
-New NGK Racing Competition Spark Plugs Platinum( 4 x B9EGV ) -Greddy polished intercooler piping kit 3 pieces
-Hard intake piping kit ( Gotham Racing )
-Engine management Apexi Power FC with Commander ( Boost is set to 13 - 14 PSI )
-Pettit Racing Rally Clutch Kit ( need to be install this spring )
-Greddy stock mount polished intercooler to accomodate my 12 to 14 psi.....
-Greddy Pulley kit waterpump and alternator
-ASI Polished main pulley
-RX7TRIX Gun métal AST ( air separator tank )
-Walbro fuel pump

 

more like this

-New Street ported engine with 3mm Apex Seals with only 5000 miles on it
--Apexi Dual Power Intake
-Racing Beat air inlet duct
-HKS mild steel Downpipe 3''
-HKS Hi Power Cat-Back 3''
-RX-7 Store Resonated Mid Pipe 3 ''
-Efini Y pipe
- Apexi Power FC with Commander ( Boost is set to 13 - 14 PSI )
-Greddy stock mount intercooler to accomodate my 12 to 14 psi.....
-Greddy Pulley kit waterpump and alternator
-ASI Polished main pulley
-Walbro fuel pump
-Double Throttle Removed
-Airpump removed from the engine bay
-Exhaust Gas Recirculation Removed
-Fuel pressure solenoid by passed
-New NGK Racing Competition Spark Plugs Platinum( 4 x B9EGV )

Edit- I would say that you are easily going to hit 330-350 @14 psi. It looks like you went through great deals to make sure everything is healthy.

Car sounds nice. Yeah post a chart when you get it dynoed

 

Now everyone should be happy with this shorter list and no more negative post should be seen..Greats!!! now let's talk about things more constructive.....

broken93 post:
Sure, you can do 325 wheel horsepower, but you will be at almost the functional limit of your fuel injectors. I strongly recommend, with all the time and money you spent on this setup, that you spend the extra few hundred bucks for some bigger secondaries.

My only concern about the secondaries injectors is not the price at all, it is more about the install ???? What is involved when installing those injectors ? I'm just a little tired about removing my parts and reinstall it. (install, uninstall, install, break a nut or something like that you know what I mean )

 

Very simple for the secondaries:

1) Remove T/B elbow/piping
2) Remove UIM [5 bolts] (whilst unhooking MAP, ISC valve, WG solenoid, etc)
3) Remove both secondary injector connectors
4) Remove two (2) screws per injector that retain the injector in the rail
5) Remove and replace each injector, verifying that o-rings are in good shape
6) Put retaining caps/screws back
7) Put clips back
8) Put UIM back
9) Adjust PFC settings
10) Put T/B elbow/etc back
11) Start car and enjoy!

 

(1) ASI Polished main pulley.
Being polished is extra verbage, pulley being underdrive does help power output.
Is an ASI pulley underdrive?

(2) Airpump removed from the engine bay.
Does not affect max HP, only affects power below 3000rpm.

(3) Exhaust Gas Recirculation Removed.
Only affects cruise.

(4) Fuel pressure solenoid by passed.
No affect on power.

 

Here's an even shorter list:

- fresh engine with street port & 3mm apex seals
- apexi intake
- Efini y-pipe
- Greddy SMIC
- HKS downpipe
- resonated midpipe
- HKS catback (Hi-Power)
- PowerFC
- stock injectors
- Walbro fuel pump
- 13-14 psi boost
- Double Throttle removed
- Greddy pulley kit (WP & alt)
- underdrive main pulley (?)

You should be able to do 325RWHP at 12-13 psi of boost. I think you'll be pleased with the results.

-Max

 

RX7Trix told me that the main pulley underdrive my accessories by 25%. It is the same kit like the Pettit's.....

 

Also,If I buy a Twin Power ignition after my tuning, do you think it will change my air fuel ratio dramatically ? Cause at the moment I can't afford for a brand new one....

 

sorry for the triple post but I ask the same question for the secondary injectors ??Can I change them after my tuning session ???

 

sorry for the triple post but I ask the same question for the secondary injectors ??Can I change them after my tuning session ???

 

you will want to do that stuff in advance of the tuning so that the effects of the twinpower or larger injectors can be taken advantage of during tune. if you do it afterwards, you would need to re-tune in order to really take advantage of those parts.

for example, why do you put in larger injectors? to run more fuel so you can supply enough fuel under higher boost.

why would you install a twinpower? to gain more efficiency in the ignition system to burn the extra fuel you need to run more boost and create more HP.

it's a vicious circle, eh (or should is say n'est pas?).

 

42. What was the question again?

 

Yes, dramatically (some got more then 1 whole point leaner AFRs - i.e. from 10:1 to 11:1). Get it before you have it tuned or you will have to install even fresher apex seals

 

just like a lot of people have said, your fuel system will limit you to 325hp.... or at least steve kan will only tune for 325 only cuz it starts getting risky after that point

 

now that i think about it i think 325 is unlikely as he still has the cat in there. i say 315rwhp.

 

Without the secondaries and the Twin Power ignition , I'm limited to 325WHP...

If SantaClaus give me the chance to afford those two parts before my tuning can I hope reach at least 350WHP???

Cause 387US$ for the Twin power with harness + 330US$ for Nippondenso 1300cc that drop into the stock fuel rail is a lot of monney. For around 25 WHP It's a good investment you know.....


Thanks to all of you, I appreciate your comment, opinion and experience....

Kevin

 

all depends on boost level. the cat sucks..get rid of it.

 

I have a brand new RX7 store resonated midpipe ?? It is suppose to flow as well as a midpipe may be a little less but not a big difference...... it is between the hi flow cat and the midpipe...Not bad at all in my opinion...

 

opps..i feel dumb.
yeah then 350 rwhp would be no problem.