more boost

[hooper]

What is the most effective and simple way to increase my overall boost?

[Phoenix7]

well, you don't just increase boost like it's a scoop of ice-cream. I assume you're looking for more power?

You can get a boost increase if you open up your exhaust. You MAY spike and then your motor will commit hara-kiri.


What are your current mods?

[hooper]

all i know is this.. just bought the car. it has a larger aluminum intercooler, larger charge pipes, external blow off valve, not sure on the fuel mods and its supposed to have a tuner program installed. engine has only 10 000 kms on it. completely rebuilt.. i mean the car is really fast, but just not enough.. i have a dyno sheet and it says my rwhp is 402.6.... how can i get more?... i also know that the turbos are stock efinis

[Phoenix7]

damn. Can you contact the original owner about the fuel mods? You're missing a lot of the important information.

:dunno: is it safe to assume it's stock? Is this in Kw? or HP? (you mentioned KM and can't tell if it's Canada or overseas)

[hooper]

i live in canada and the odometer is in km/h. i bought it from an importer off the boat from japan.. he didnt know much more than i have told you.. i have no idea who the original owner is.. the engine is not stock.. it was a drift car in japan.. and the dyno slip is 402.6 rwhp... so im guessing its horsepower... ??

[hooper]

i have to run 94 octane gasoline in the car aswell...

[Phoenix7]

The info you have doesn't really help you at all.

As far as the slip, well, how do you know it goes with your car?

I wouldn't touch it unless you're willing to at least remove the injectors and send them out to get flow tested.

Look and see if you still have the stock fuel pump.

You said it had a "tuner program" is this like a chip? or does it have piggy-backs?

Take some engine bay pics to see if it's the stock setup.

DO you know if it's still twin turbo or if it's been converted to single?

[hooper]

still twin turbo.. the slip is for my car .. it has my vin # on the slip. the car was tuned in japan.. the stock program was removed and changed and reinstalled .. no chip. the injectors have been changed.. but im not sure what the size of flow they have... simple to pull out and get tested???

[Phoenix7]

Depends on what you consider simple. Check out the link marked FSM in my signature for the Factory Service Manual.

[0110-M-P]

I really think the best thing for you to do is to contact whoever sold you the car and get the exact modifications done. If you can't do that take it to a RX-7 specific shop (generic performance shop may or may not be able to tell you everything) and get them to really look everything over to get a general diagnosis of what you are working with.

To obtain the power level that your dyno sheet claims, you will have to have a healthy amount of work done and to make this power reliably it will need to have had even more work done. So do yourself and your engine a favor by not trying to increase the boost until you are 100% positive what is installed on the car. Who knows...you could be on an aggressive tune that has no wiggle room for extra boost.

[hooper]

awsome thanks... once i figure how much they flow.... will i have enough info to see where i can get more power?? how much power do these engines usually peak out at??

[85rx-7gsl-se]

So this a JDM import RHD FD? I would definetely be careful as 400whp on twins in pretty pumping and requires a decent amount of work.

[Phoenix7]

awsome thanks... once i figure how much they flow.... will i have enough info to see where i can get more power?? how much power do these engines usually peak out at??not really. It just tells you where you are starting.

One option is a wideband Oxygen sensor to tell you how rich/lean you are but then you also need to get a fuel controller (to increase/decrease flow according to wideband readings). I wouldn't go this route considering that you will most likely blow your motor.


I think you're trying to do run a marathon and you just learned to run. For the longevity of your car I suggest you slow down a bit.

Listen to M-P and take it to a shop.

[hooper]

I was just looking through all the receipts the car came with and found something for Nippondenso 1300cc Injector.. is this good.. what is the stock injector size?? i also just measured the exhause pipe and it is 4 inches...

[85rx-7gsl-se]

Those are some big injectors.

[Phoenix7]

that's good news tho. Now to figure out if he has a bigger turbo and how he's controlling the fuel.

Stock is 550cc/min for primaries and 850cc/min for secondaries.

All these questions can be found via the link FSM in my sig. Section TD page 4 under Fuel System.

PICS of turbo?

[dregg100]

he said it was on stock twins, and if he indeed is on stock twins, they are screaming at that power level. get us some engine bay pics and close ups of the turbos. 1300cc injectors are pretty close to being maxed out at the hp level if you are still on stock primaries. the stock injectors are 550s and 850s. pull the passenger kick paned off and see if it has the stock ecu or a power FC.(it is very obvious which is which)

but in the end based the initial question you asked, you are way better off taking it to a rotary shop and having them look it over and tell you what you have. your experience level with these cars(or lack there of) will most likely lead to you destroying your engine and we dont want that. good luck

[hooper]

i dont have a digital camera yet... will soon tho.. id love for you all to see this machine

[hooper]

thanks again

[Phoenix7]

Just take it easy since you don't know what ECU you have or what it's doing. Welcome to the club.