spekdah

I've been having a lot of trouble with my engine stuttering at 4500rpm.
After a search I was convinced it was ignition, I checked my sparkys and replaced ( 2 b safe) and still had the problem. Then I started thinking it was a vacume or turbo issue.
Today I completed my poor mans non seq mod, now the car feels great! and the power ( even though boost comes on 3000-4000rpm) is smooth right through the curve to 6500rpm , I managed 16.5psi in a run??!!

So do you think I was right , was it a turbo problem NOT an ignition one??
Or does the non seq correct these kinds of ignition problems??

evot23

iTrader: (17)

Could have been a vacuum problem, which you eliminated when going non-sequential. Doing the nonsequential mod has nothing to do with your ignition.

16.5psi on stock twins isn't good.

spekdah

why is 16.5 psi not good? too much power?

clayne

YES.

Too much charge temp heat for the stock IC, too much airflow for the stock fuel system, and please tell me you aren't running the stock engine management.

evot23

iTrader: (17)

Too much for stock twins to handle. You'll be decreasing the life of your turbos. Besides, stock twins lose their efficiency around 15 psi.

scotty305

iTrader: (2)

Read this, look for something about efficiency or something like that...

http://auto.howstuffworks.com/turbo.htm


Basically, your turbochargers were designed to be run at certain levels of boost. If you exceed this too much, you put extra stress on them, which will cause the turbo's to wear out more quickly.

Even before they wear out, overboosting will cause the air to be hotter, which might lead to detonation, which could destroy your apex seals.


How much boost can your turbo's make safely? The answer to that is beyond my knowledge.


One other thing, which year is your RX7? In NZ, you guys have the 96+ models also, correct?


-s-

spekdah

I,m running a 400 x 300 x 100 FMIC, I have 3mm seals, and a fully dyno tuned PFC. But I suppose this is not enough????

RX7Wishing

you could have a MAc Truck IC, but if you dont have the fuel to compinsate for the increase in charged air..well.. you know..

Plus a IC isnt going to save your turbos

clayne

That's much better.

However.. check fuel system capabilties (pump, injector, fpr capacities, etc.) and have it dyno tuned at around 1 bar max.

evot23

iTrader: (17)

Excellent supporting mods but the fact remains that the turbos can't handle/weren't meant to handle 16.5 psi. Your engine is looking safe with all of that but now you just need a bigger turbo.

What about fuel delivery?

spekdah

right, thats it then ay? I'm gonna go single, I got a mate with a big *** turbo for sale, an HKS T51 Kai, would this give me much power???

evot23

iTrader: (17)

oh yeah!